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Unveiling the promotion role of ZnO on Zn-Al spinel oxide for CO2 hydrogenation

Journal of Energy Chemistry 2025年第1期 18-25页

作者： Tongyao Wang Xinlong Yao Lixin Liang Hongyu Chen pan Gao Guangjin Hou State Key Laboratory of Catalysis Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

The Zn-Al spinel oxide stands out as one of the most active catalysts for high-temperature methanol synthesis from CO2hydrogenation. However, the structure–activity relationship of the reaction remains poorly understood due to challenges in atomic-level structural characterizations and analysis of reaction intermediates. In this study, we prepared two Zn-Al spinel oxide catalysts via coprecipitation（ZnAl-C）and hydrothermal（ZnAl-H） methods, and conducted a comparative investigation in the CO2hydrogenation reaction. Surprisingly, under similar conditions, ZnAl-C exhibited significantly higher selectivity towards methanol and DME compared to ZnAl-H. Comprehensive characterizations using X-ray diffraction（XRD）, Raman spectroscopy and electron paramagnetic resonance（EPR） unveiled that ZnAl-C catalyst had abundant ZnO species on its surface, and the interaction between the ZnO species and its ZnAl spinel oxide matrix led to the formation of oxygen vacancies, which are crucial for CO2adsorption and activation. Additionally, state-of-the-art solid-state nuclear magnetic resonance（NMR） techniques,including ex-situ and in-situ NMR analyses, confirmed that the surface ZnO facilitates the formation of unique highly reactive interfacial formate species, which was readily hydrogenated to methanol and DME. These insights elucidate the promotion effects of ZnO on the ZnAl spinel oxide in regulating active sites and reactive intermediates for CO2-to-methanol hydrogenation reaction, which is further evidenced by the significant enhancement in methanol and DME selectivity observed upon loading ZnO onto the ZnAl-H catalyst. These molecular-level mechanism understandings reinforce the idea of optimizing the ZnO-ZnAl interface through tailored synthesis methods to achieve activity-selectivity balance.

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Decoupling effect and driving factors of carbon footprint in megacity Wuhan,Central China

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Ecological Processes 2023年第1期12卷 330-343页

作者： Gao pan Xinhang Li Deng pan Wensheng Liu College of Life Science and Technology Central South University of Forestry and TechnologyChangsha 410004People’s Republic of China Central South Academy of Inventory and Planning of NFGA Changsha 410014People’s Republic of China

Background China’s 35 largest cities,including Wuhan,are inhabited by approximately 18%of the Chinese popula-tion,and account for 40%energy consumption and greenhouse gas *** is the only sub-provincial city in Central China and,as the eighth largest economy nationwide,has experienced a notable increase in energy ***,major knowledge gaps exist in understanding the nexus of economic development and carbon footprint and their drivers in *** We studied Wuhan for the evolutionary characteristics of its carbon footprint(CF),the decoupling relation-ship between economic development and CF,and the essential drivers of *** on the CF model,we quantified the dynamic trends of CF,carbon carrying capacity,carbon deficit,and carbon deficit pressure index from 2001 to *** also adopted a decoupling model to clarify the coupled dynamics among total CF,its accounts,and eco-nomic *** used the partial least squares method to analyze the influencing factors of Wuhan’s CF and determine the main *** The CF of Wuhan increased from 36.01 million t CO_(2)eq in 2001 to 70.07 million t CO_(2)eq in 2020,a growth rate of 94.61%,which was much faster than that of the carbon carrying *** energy consumption account(84.15%)far exceeded other accounts,and was mostly contributed by raw coal,coke,and crude *** carbon deficit pressure index fluctuated in the range of 8.44-6.74%,indicating that Wuhan was in the relief zone and the mild enhancement zone during *** the same time,Wuhan was in a transition stage between weak and strong CF decoupling and economic *** main driving factor of CF growth was the urban per capita residen-tial building area,while energy consumption per unit of GDP was responsible for the CF *** Our research highlights the interaction of urban ecological and economic systems,and that Wuhan’s CF changes were mainly affected by four factors:city size,economic developm

关键词： Carbon footprint Economic development Decoupling analysis Partial least squares analysis Megacity

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Uncertainty Principles on Clifford Modules

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Acta Mathematica Sinica,English Series 2024年第10期40卷 2537-2570页

作者： pan LIAN School of Mathematical Sciences Tianjin Normal UniversityTianjin 300387P.R.China

In this paper,we derive the optimal Cauchy–Schwarz inequalities on a class of Hilbert and Krein modules over a Clifford algebra,which heavily depend on the Clifford algebraic *** obtained inequalities further lead to very general uncertainty inequalities on these *** new phenomena arise,due to the non-commutative nature,the Clifford-valued inner products and the Krein *** into account applications,special attention is given to the Dirac operator and the Howe dual pair Pin(m)×osp(1|2).Moreover,it is surprisingly to find that the recent highly nontrivial uncertainty relation for triple observables is indeed a direct consequence of our Cauchy–Schwarz *** new observation leads to refined uncertainty relations in terms of the Wigner–Yanase–Dyson skew information for mixed states and other *** show that the obtained uncertainty inequalities on Clifford modules can be considered as new uncertainty relations for multiple observables.

关键词： Clifford algebra uncertainty principle Krein space Fischer decomposition Wigner-Yanase-Dyson skew information

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Hermitian-Poisson Metrics on Flat Bundles over Complete Hermitian Manifolds

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Chinese Annals of Mathematics,Series B 2021年第4期42卷 575-582页

作者： Changpeng pan School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026China

In this paper,the author solves the Dirichlet problem for Hermitian-Poisson metric equation√(-1)Λ_(ω)G_(H)=λId and proves the existence of Hermitian-Poisson metrics on flat bundles over a class of complete Hermiti... 详细信息

关键词： Flat bundle Hermitian harmonic metric Hermitian-poisson metric Complete Hermitian manifolds

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Progress of the Quantum Experiment Science Satellite(QUESS) Micius Project

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空间科学学报 2018年第5期38卷 604-609页

作者： pan Jianwei Department of Modern Physics and Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai 201315

By using satellites, ultra-long-distance quantum communication and tests of quantum foundations could be achieved at a global scale. The Quantum Experiment Science Satellite(QUESS) in China, also called Micius, one of the scientific satellite programs in the Strategic Priority Program on space science, the Chinese Academy of Sciences, was launched on 16 August 2016. There are totally 4 scientific payloads. We give a brief overview of the quantum experiment science satellite project and present most recent science results. The main scientific goal of the quantum experiment science satellite was achieved in 2017. Here, we introduce the latest achievements in satellite-based quantum communication and large-scale tests of quantum foundations obtained by Micius.

关键词：科学卫星实验科学卫星工程中国科学院优先级测试通讯基础

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Estimating the power spectrum of a discrete cosmic momentum field with fast Fourier transform

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Research in Astronomy and Astrophysics 2020年第9期20卷 253-267页

作者： Jun pan National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China

Fast Fourier transform based estimators are formulated for measuring momentum power spectra,including the auto power spectra of the momentum,the momentum divergence,and the cross spectrum of density fluctuation and momentum *** using the third order Bettle-Lemariéscaling function to assign discrete objects to regular grids for fast Fourier transform are proposed to clean alias *** experiments prove that the implementation can achieve sub-percent precision till close to the Nyquist *** impact of removing bulk flow on the estimation of momentum power spectra is derived theoretically and verified *** bulk flow has little effects at large scales but might induce meaningful differences in nonlinear regime,and probably it is not necessary to subtract bulk flow for samples which peculiar velocities are exact or sufficiently *** power spectra of dark matter samples from N-body simulation are measured and *** expected,the prediction of the one loop Eulerian perturbation theory agrees with simulation only slightly better than the linear theory at z=0,but can be applied to higher redshift with improved *** of simulation data and the one loop Eulerian theory both reveal that the momentum field contains strong rotational part,and there is a large stochastic component in the divergence of momentum which is not correlated with the density *** three kinds of momentum power spectra have their own characteristics.

关键词： large scale structure of Universe cosmology:theory methods:numerical methods:statistical

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Recent advances in self-propelled particles

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Science China Chemistry 2017年第10期60卷 1293-1304页

作者： Qi pan Yan He Department of Chemistry Tsinghua University Beijing 100084 China

"Active" components can be introduced into a passive system to completely change its physical behavior from its typical behavior at thermodynamic equilibrium. To reveal the interaction mechanisms between individuals, researchers have designed unique self-propelled particles to mimic the collective behavior of biological systems. This review focuses on recent theoretical and experimental advances in the study of self-propelled particle systems and their individual and collective behaviors. The potential applications of active particles in chemical, biological and environmental sensing and single particle imaging are discussed.

关键词： self-propelled particles micromotors collective behavior single particle tracking

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CALCULATION OF ELECTROCHEMICAL OVERPOTENTIAL AND CONCENTRATION OVERPOTENTIAL BASED ON CURVE OF ANODIC POLARIZATION IN HYDROGEN STORAGE ALLOY ELECTRODE

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中国有色金属学会会刊：英文版 1999年第2期9卷 56-60页

作者： pan, Hongge Zhejiang Univ Hangzhou China

１ＩＮＴＲＯＤＵＣＴＩＯＮＭｅｔａｌｈｙｄｒｉｄｅｓｈａｖｅｂｅｅｎｕｓｅｄａｓｎｅｇａｔｉｖｅｅｌｅｃｔｒｏｄｅｓｏｆｎｉｃｋｅｌ／ｍｅｔａｌｈｙｄｒｉｄｅｂａｔｅｒｉｅｓｉｎｐｌａｃｅｏｆｃａｄｍｉｕｍ，ｂｅｃａ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＭｅｔａｌｈｙｄｒｉｄｅｓｈａｖｅｂｅｅｎｕｓｅｄａｓｎｅｇａｔｉｖｅｅｌｅｃｔｒｏｄｅｓｏｆｎｉｃｋｅｌ／ｍｅｔａｌｈｙｄｒｉｄｅｂａｔｅｒｉｅｓｉｎｐｌａｃｅｏｆｃａｄｍｉｕｍ，ｂｅｃａｕｓｅｏｆｔｈｅｉｒｈｉｇｈｅｎｅ...

关键词： electrochemical overpotentialconcentration overpotentialanodic polarizationhydrogen storage alloy

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Geochronology and Geochemistry of Wangjiadashan Quartz Syenite Porphyry in Suizao Area of Hubei Province in the Tongbai-Dabie Orogenic Belt

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Journal of Earth Science 2023年第3期34卷 790-805页

作者： pan-pan Niu Shao-Yong Jiang State Key Laboratory of Geological Processes and Mineral Resources School of Earth ResourcesChina University of GeosciencesWuhan 430074China Key Laboratory of Geological Survey and Evaluation of Ministry of Education China University of GeosciencesWuhan 430074China Collaborative Innovation Center for Exploration of Strategic Mineral Resources China University of GeosciencesWuhan 430074China

The Wangjiadashan area in Suizhou-Zaoyang region of Hubei Province in the Tongbai-Dabie orogenic belt hosts important copper-gold deposits and contains a large number of quartz syenite porphyry dykes,occurring mostly along the NEE-trend *** this study,we used LA-ICP-MS zircon U-Pb dating method and obtained an age of 143.6±1.4 Ma,which represents the emplacement of these quartz syenite porphyry dykes was at the Yanshanian,but it was slightly earlier than the previously reported ages(139-135 Ma)for granites widespreading in Suizao *** geochemical data of the Wangjiadashan quartz syenite porphyry show high K_(2)O,CaO,Na_(2)O and Al_(2)O_(3)contents but extremely low MgO contents(0.01 wt.%-0.46 wt.%).The geochemical characteristics indicate that these quartz syenite porphyry dykes belong to the typical C-type adakite and were possibly formed in the post-collisional ***-isotopic(Sr-Nd-Pb-Hf)analyses indicate that these quartz syenite porphyry dykes were originated from crust without distinct mantle materials *** is suggested that the Wangjiadashan quartz syenite porphyry was generated from partial melting of the thickened lower continental crust,and garnet but no plagioclase was left as residual *** with the widespread granites of the Tongbai area,the Wangjiadashan quartz syenite porphyry formed earlier and derived from more juvenile and K-rich lower crust,while they all belong to intensive magmatism concentrated during the Early Cretaceous epoch in the Tongbai area.

关键词： quartz syenite porphyry zircon U-Pb dating geochemistry Sr-Nd-Pb-Hf isotopes petrogenesis Wangjiadashan Tongbai Orogen

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Compressive Mechanical Characteristics of Multi-layered Gradient Hydroxyapatite Reinforced Poly(Vinyl Alcohol) Gel Biomaterial

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Journal of Materials Science & Technology 2013年第6期29卷 551-556页

作者： Yusong pan Qianqian Shen Chengling pan Jing Wang School of Materials Science and Engineering Anhui University of Science and TechnologyHuainan 232001China

Functional gradient materials provided us a new concept for artificial articular cartilage design with gradient component and gradient structure where one side of the material is high free water content thereby providing excellent lubrication function and the opposite side of the material is high hydroxyapatite content, thereby improving the bioactivity of the material and stimulating cell growth. The goal of the present study was to develop a multi-layered gradient HA/PVA gel biocomposites through layer-by-layer casting method combing with freeze/thaw cycle technology. The various influence factors on the compressive strength and modulus of the multi-layered gradient biocomposites were investigated. The results showed that the compressive mechanical characteristics of the biocomposites were similar to that of natural articular cartilage. Both the compressive strength and modulus of the multi-layered gradient HA/PVA gel biocomposites increased exponentially with the rise of compressive strain ratio. Both the compressive strength and average compressive modulus of the biocomposites improved with the rise of freeze/thaw cycle times and total concentration of HA particles in the biocomposites, but they showed decreasing tendency with the rise of HA concentration difference between adjacent layers.

关键词： Multi-layered gradient HA/PVA gel biocomposites Freeze/thaw cycle times Strength Modulus

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