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The effect of hierarchical single-crystal ZSM-5 zeolites with different Si/Al ratios on its pore structure and catalytic performance

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Frontiers of Chemical Science and Engineering 2021年第2期15卷 269-278页

作者： Yuexin Hou Xiaoyun li Minghui Sun chaofan li Syed ul Hasnain Bakhtiar Kunhao Lei Shen Yu Zhao Wang Zhiyi Hu lihua Chen Bao-lian Su Laboratory of living Materials at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Silicate Material for Architectures Wuhan University of TechnologyWuhan 430070China Laboratory of Inorganic Materials Chemistry(CMI) University of NamurB-5000 NamurBelgium Nanostructure Research Centre(NRC) Wuhan University of TechnologyWuhan 430070China Clare Hall University of CambridgeCambridgeCB39ALUK

Hierarchical single-crystal ZSM-5 zeolites with different Si/Al ratios(Hier-ZSM-5-x,where x=50,100,150 and 200)were synthesized using an ordered mesoporous carbon-silica composite as hard ***-ZSM-5-x exhibits improved mass transport properties,excellent mechanical and hydrothermal stability,and higher catalytic activity than commercial bulk zeolites in the benzyl alcohol self-etherification *** show that a decrease in the Si/Al ratio in hierarchical single-crystal ZSM-5 zeolites leads to a significant increase in the acidity and the density of micropores,which increases the final catalytic *** effect of porous hierarchy on the diffusion of active sites and the final catalytic activity was also studied by comparing the catalytic conversion after selectively designed poisoned acid *** poisoned Hier-ZSM-5-x shows much higher catalytic conversion than the poisoned commercial ZSM-5 zeolite,which indicates that the numerous intracrystalline mesopores significantly reduce the diffusion path of the reactant,leading to the faster diffusion inside the zeolite to contact with the acid sites in the micropores predominating in ZSM-5 *** study can be extended to develop a series of hierarchical single-crystal zeolites with expected catalytic performance.

关键词： hierarchical zeolites single crystalline interconnected pores improved diffusion performance benzyl alcohol self-etherification reaction

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Insights from the Second Tibetan Plateau Scientific Expedition: Unveiling the westerly–monsoon synergy and hydroclimate changes

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Atmospheric and Oceanic Science Letters 2024年第5期17卷 1-2页

作者： chaofan li Yaoming Ma Tianjun Zhou Riyu Lu Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Land-Atmosphere Interaction and Its Climatic Effects Group State Key Laboratory of Tibetan Plateau Earth SystemEnvironment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijingChina State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina College of Hydraulic&Environmental Engineering China Three Gorges UniversityYichangChina College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijingChina College of Atmospheric Sciences Lanzhou UniversityLanzhouChina Qomolangma Atmospheric and Environmental Observation and Research Station TingriChina Kathmandu Center for Research and Education Chinese Academy of Sciences-Tribhuvan UniversityBeijingChina China-Pakistan Joint Research Center on Earth Sciences IslamabadPakistan

The Tibetan Plateau(TP),often referred to as the“Asian Water Tower”,holds vast reserves of glaciers,snow,and permafrost,serving as the crucial source for major rivers that support billions of people across *** TP’s unique geographical positioning fosters significant interplay between the westerly and monsoon systems,the hydroclimate changes on the TP and its interactions with these two major atmospheric circulation systems through both the thermodynamic and dynamic processes,as well as the atmospheric water cycle of the *** interactions have far-reaching impacts on the weather and climate of China,Asia,and even the global atmospheric circulation.

关键词： Tibetan Plateau holds

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Seasonal Rainfall Forecasts for the Yangtze River Basin in the Extreme Summer of 2020

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Advances in Atmospheric Sciences 2021年第12期38卷 2212-2220,I0013页

作者： Philip E.BETT Gill M.MARTIN Nick DUNSTONE Adam A.SCAIFE Hazel E.THORNTON chaofan li Met Office Hadley Centre FitzRoy RoadExeter EX13PBUK College of Engineering Mathematics and Physical SciencesUniversity of ExeterExeterEX44QFUK Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

Seasonal forecasts for Yangtze River basin rainfall in June,May–June–July(MJJ),and June–July–August(JJA)2020 are presented,based on the Met Office GloSea5 *** three-month forecasts are based on dynamical predictions of an East Asian Summer Monsoon(EASM)index,which is transformed into regional-mean rainfall through linear *** June rainfall forecasts for the middle/lower Yangtze River basin are based on linear regression of *** forecasts verify well in terms of giving strong,consistent predictions of above-average rainfall at lead times of at least three ***,the Yangtze region was subject to exceptionally heavy rainfall throughout the summer period,leading to observed values that lie outside the 95%prediction intervals of the three-month *** forecasts presented here are consistent with other studies of the 2020 EASM rainfall,whereby the enhanced mei-yu front in early summer is skillfully forecast,but the impact of midlatitude drivers enhancing the rainfall in later summer is not *** case study demonstrates both the utility of probabilistic seasonal forecasts for the Yangtze region and the potential limitations in anticipating complex extreme events driven by a combination of coincident factors.

关键词： seasonal forecasting flood forecasting Yangtze basin rainfall East Asian Summer Monsoon

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Three-Dimensional Diabatic Potential Energy Surfaces of Thiophenol withNeural Networks

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Chinese Journal of Chemical Physics 2021年第6期34卷 825-832,I0003页

作者： chaofan li Siting Hou Changjian Xie Institute of Modern Physics Northwest UniversityXi'an 710127China Shaanxi Key Laboratory for Theoretical Physics Frontiers Xi'an 710127China

Three-dimensional(3D)diabatic potential energy surfaces(PESs)of thiophenol involving the S0,and coupled 1ππ^(*) and 1πσ^(*) states were constructed by a neural network ***,the diabatization of the PESs for the 1ππ^(*) and 1πσ^(*) states was achieved by the fitting approach with neural networks,which was merely based on adiabatic energies but with the correct symmetry constraint on the off-diagonal term in the diabatic potential energy *** root mean square errors(RMSEs)of the neural network fitting for all three states were found to be quite small(lifetime of the 0^(0) state of S_(1) on the neural network PESs are found to be in good agreement with those from the earlier diabatic PESs,which validates the accuracy and reliability of the PESs fitted by the neural network approach.

关键词： Diabatic potential energy surfaces Neural networks Photodissociation

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Promising graphdiyne-based nanomaterials for environmental pollutant control

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Science China Materials 2024年第11期67卷 3456-3467页

作者： Chuanqi Pan Qianli He chaofan li College of Environmental Engineering Henan University of TechnologyZhengzhou 450001China 2 Institute of ChemistryHenan Academy of SciencesZhengzhou 450002China Institute of Quality Standard and Testing Technology for Agro-Products Chinese Academy of Agricultural Sciencesand Key Laboratory of Agro-Food Safety and Quality Ministry of Agriculture and Rural AffairsBeijing 100081China Henan Academy of Sciences Zhengzhou 450046China

ABSTRACT Environmental pollutants,including gas phase pollutants,liquid organic pollutants,heavy metal ions,and pathogenic bacteria,pose a serious threat to our ecological environment and human *** addressing these pollutants has become one of the most urgent ***(GDY),as an emerging carbon material for environmental remediation,has unique acetylene bonds and abundant pore *** unique carbon atomic structure of sp/sp2 hybrid endows it with tunable electronic structure and outstanding physical and chemical *** review summarizes the practical applications of GDY-based nanomaterials in the context of environmental pollution control,including carbon monoxide(CO)oxidation,ozone(O_(3))decomposition,heavy metal ion detection and adsorption,organic pollutant degradation,and bacterial ***,the structure-performance relationship of GDYbased nanomaterials is analyzed,and the issues and challenges in the field of environmental remediation of GDY-based materials are indicated.

关键词： graphdiyne CO oxidation O_(3) decomposition heavy metal ion detection and adsorption organic pollutant degradation bacterial inactivation

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Probing the Nucleation and Growth Kinetics of Bismuth Nanoparticles via In-situ Transmission Electron Microscopy

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Journal of Wuhan University of Technology(Materials Science) 2024年第4期39卷 877-887页

作者：王浪李超凡 RAN Maojin YUAN Manman 胡执一 li Yu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Nanostructure Research Centre(NRC) Wuhan University of TechnologyWuhan 430070China Institute of Chemistry Henan Academy of SciencesZhengzhou 450002China Henan Academy of Sciences Zhengzhou 450046China

The nucleation and growth mechanism of nanoparticles is an important theory,which can guide the preparation of ***,it is still lacking in direct observation on the details of the evolution of intermediate state structure during nucleation and *** this work,the evolution process of bismuth nanoparticles induced by electron beam was revealed by in-situ transmission electron microscopy(TEM)at atomic *** experimental results demonstrate that the size,stable surface and crystallographic defect have important influences on the growth of Bi *** non-classical growth paths including single crystal growth and polycrystalline combined growth,as well as,corresponding layer-by-layer growth mechanism along{012}stable crystal plane of Bi nanoparticles with dodecahedron structure were revealed by in-situ TEM *** results provide important guidance and a new approach for in-depth understanding of the nucleation and growth kinetics of nanoparticles.

关键词： bismuth nanoparticles crystal growth transmission electron microscopy in-situ electron microscopy

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Precipitation Controls on Carbon Sinks in an Artificial Green Space in the Taklimakan Desert

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Advances in Atmospheric Sciences 2024年第12期41卷 2300-2312页

作者： Yingwei SUN Fan YANG Jianping HUANG Xinqian ZHENG Ali MAMTIMIN Chenglong ZHOU Silalan ABUDUKADE Jiacheng GAO chaofan li Mingjie MA Wen HUO Xinghua YANG Institute of Desert Meteorology China Meteorological Administration/National Observation and Research Station of Desert MeteorologyTaklimakan Desert of Xinjiang/Taklimakan Desert Meteorology Field Experiment Station of China Meteorological Administration/Xinjiang Key Laboratory of Desert Meteorology and Sandstorm/Key Laboratory of Tree-ring Physical and Chemical ResearchChina Meteorological AdministrationUrumqi 830002China Xinjiang Branch of China Meteorological Administration Meteorological Cadre Training College Urumqi 830002China Collaborative Innovation Center for Western Ecological Safety College of Atmospheric SciencesLanzhou UniversityLanzhou 730000China Xinjiang Agro-Meteorological Observatory Urumqi 830002China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster School of Geographic SciencesNanjing University of Information Science and TechnologyNanjing 210044China

Control of desertification can not only ameliorate the natural environment of arid regions but also convert desertified land into significant terrestrial carbon sinks,thereby bolstering the carbon sequestration capacity of arid ***,longstanding neglect of the potential carbon sink benefits of desertification management,and its relationship with environmental factors,has limited the exploration of carbon sequestration *** on CO_(2) flux and environmental factors of artificial protective forest in the Taklamakan Desert from 2018 to 2019,we found that the carbon storage capacity of the desert ecosystem increased approximately 140-fold after the establishment of an artificial shelter forest in the desert,due to plant *** levels less than 2 mm had no impact on carbon exchange in the artificial shelter forest,whereas a precipitation level of approximately 4 mm stimulated a decrease in the vapor pressure deficit over a short period of about three days,promoting photosynthesis and enhancing the carbon absorption of the artificial shelter *** events greater than 8 mm stimulated soil respiration to release CO_(2) and promoted plant *** the dynamic equilibrium where precipitation stimulates both soil respiration and photosynthesis,there is a significant threshold value of soil moisture at 5 cm(0.12 m^(3) m^(-3)),which can serve as a good indicator of the strength of the stimulatory effect of precipitation on *** results provide important data support for quantifying the contribution of artificial afforestation to carbon sequestration in arid areas,and provide guidance for the development and implementation of artificial forest management measures.

关键词： Taklimakan Desert artificial shelter forest carbon sequestration capacity CO_(2)flux precipitation

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Seasonal Forecasts of the Summer 2016 Yangtze River Basin Rainfall

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Advances in Atmospheric Sciences 2018年第8期35卷 22-30页

作者： Philip E. BETT Adam A. SCAIFE chaofan li Chris HEWITT Nicola GOLDING Peiqun ZHANG Nick DUNSTONE Doug M. SMITH Hazel E. THORNTON Riyu LU Hong-li REN Met Office Hadley Centre FitzRoy Road Exeter EX1 3PB UK College of Engineering Mathematics and Physical Sciences University of Exeter Exeter Devon EX4 4QF UK Center for Monsoon System Research Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Laboratory for Climate Studies National Climate Center China Meteorological Administration Beijing 100081 China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

The Yangtze River has been subject to heavy flooding throughout history, and in recent times severe floods such as those in 1998 have resulted in heavy loss of life and livelihoods. Dams along the river help to manage flood waters, and are important sources of electricity for the region. Being able to forecast high-impact events at long lead times therefore has enormous potential benefit. Recent improvements in seasonal forecasting mean that dynamical climate models can start to be used directly for operational services. The teleconnection from E1 Nifio to Yangtze River basin rainfall meant that the strong E1 Nifio in winter 2015/16 provided a valuable opportunity to test the application of a dynamical forecast system. This paper therefore presents a case study of a real-time seasonal forecast for the Yangtze River basin, building on previous work demonstrating the retrospective skill of such a forecast. A simple forecasting methodology is presented, in which the forecast probabilities are derived from the historical relationship between hindcast and observations. Its performance for 2016 is discussed. The heavy rainfall in the May-June-July period was correctly forecast well in advance. August saw anomalously low rainfall, and the forecasts for the June-July-August period correctly showed closer to average levels. The forecasts contributed to the confidence of decision-makers across the Yangtze River basin. Trials of climate services such as this help to promote appropriate use of seasonal forecasts, and highlight areas for future improvements.

关键词： seasonal forecasting flood forecasting Yangtze basin rainfall ENSO hydroelectricity

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EOM-CCSD-Based Neural Network Diabatic Potential Energy Matrix for ^(1)πσ^(*)-Mediated Photodissociation of Thiophenol

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Chinese Journal of Chemical Physics 2022年第3期35卷 461-470,I0002页

作者： Siting Hou chaofan li Huixian Han Changjian Xie Institute of Modern Physics Shaanxi Key Laboratory for Theoretical Physics FrontiersNorthwest UniversityXi'an 710127China School of Physics Northwest UniversityXi'an 710127China

A new diabatic potential energy matrix(PEM)of the coupled~^(1)ππ^(*)and~1πσ*states for the~1πσ*-mediated photodissociation of thiophenol was constructed using a neural network(NN)*** diabatization of the PEM was specifically achieved by our recent method[***.34,825(2021)],which was based on adiabatic energies without the associated costly derivative *** equation of motion coupled cluster with single and double excitations(EOM-CCSD)method was employed to compute adiabatic energies of two excited states in this work due to its high accuracy,simplicity,and *** PEM includes three dimensionalities,namely the S-H stretch,C-S-H bend,and C-C-S-H torsional *** root mean square errors of the NN fitting for the S1 and S2 states are 0.89 and 1.33 me V,respectively,suggesting the high accuracy of the NN method as *** calculated lifetimes of the S1 vibronic 00 and31 states are found to be in reasonably good agreement with available theoretical and experimental results,which validates the new EOM-CCSD-based PEM fitted by the NN *** combination of the diabatization scheme solely based on the adiabatic energies and the use of EOM-CCSD method makes the construction of reliable diabatic PEM quite simple and efficient.

关键词： Neural network Diabatic potential energy matrix Photodissociation dynamics

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Seasonal Rainfall Forecasts for the Yangtze River Basin of China in Summer 2019 from an Improved Climate Service

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Journal of Meteorological Research 2020年第5期34卷 904-916页

作者： Philip E.BETT Nicola MARTIN Adam A.SCAIFE Nick DUNSTONE Gill M.MARTIN Nicola GOLDING Joanne CAMP Peiqun ZHANG Chris D.HEWITT Leon HERMANSON chaofan li Hong-li REN Ying liU Min liU Met Office Hadley Centre Exeter EXI 3PBUK Plymouth Marine Laboratory Plymouth PL13DHUK College of Engineering Mathematics and Physical SciencesUniversity of ExeterDevon EX44QFUK Laboratory for Climate Studies National Climate CenterChina Meteorological AdministrationBeijing 100081China University of Southern Queensland Toowoomba QLD 4350Australia Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&TechnologyNanjing 210044China Wuhan Regional Climate Center Wuhan 430074China

Rainfall forecasts for the summer monsoon season in the Yangtze River basin(YRB) allow decision-makers to plan for possible flooding, which can affect the lives and livelihoods of millions of people. A trial climate service was developed in 2016, producing a prototype seasonal forecast product for use by stakeholders in the region, based on rainfall forecasts directly from a dynamical model. Here, we describe an improved service based on a simple statistical downscaling approach. Through using dynamical forecast of an East Asian summer monsoon(EASM) index, seasonal mean rainfall for the upper and middle/lower reaches of YRB can be forecast separately by use of the statistical downscaling, with significant skills for lead times of up to at least three months. The skill in different sub-basin regions of YRB varies with the target season. The rainfall forecast skill in the middle/lower reaches of YRB is significant in May–June–July(MJJ), and the forecast skill for rainfall in the upper reaches of YRB is significant in June–July–August(JJA). The mean rainfall for the basin as a whole can be skillfully forecast in both MJJ and JJA. The forecasts issued in 2019 gave good guidance for the enhanced rainfall in the MJJ period and the near-average conditions in JJA. Initial feedback from users in the basin suggests that the improved forecasts better meet their needs and will enable more robust decision-making.

关键词： seasonal rainfall forecasts climate service Yangtze River basin(YRB) East Asian summer monsoon(EASM)

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