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Processes Controlling the Carbonate Chemistry of Surface Seawater Along the 150°E Transect in the Northwest Pacific Ocean

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Journal of Ocean University of China 2022年第6期21卷 1529-1537页

作者： MOU Liang ZHANG Honghai chen zhaohui HU Yubin Institute of Marine Science and Technology Shandong UniversityQingdao 266237China Frontiers Science Center for Deep Ocean Multispheres and Earth System and Key Laboratory of Marine Chemistry Theory and TechnologyMinistry of EducationOcean University of ChinaQingdao 266100China Physical Oceanography Laboratory Ocean University of ChinaQingdao 266100China

The problem of ocean acidification caused by the increase of atmospheric carbon dioxide concentration is becoming increasingly *** observation in the northwest Pacific Ocean was carried out along the 150°E transect in November *** distribution characteristics and influencing factors of the surface seawater carbonate chemistry,including dissolved inorganic carbon(DIC),total alkalinity(TA),pH,partial pressure of carbon dioxide(pCO_(2))and aragonite saturation state(Ω_(arag))were *** and TA ranged from 1915 to 2014μmol kg^(−1)and 2243 to 2291μmol kg^(−1),respectively;DIC in general decreased with decreasing latitude,but TA had no clear latitudinal ***_(2)values increased with the decrease of latitude and were all below the atmospheric pCO_(2)level,ranging from 332 to 387μ*** on the total hydrogen ion concentration scale(pH_(T))decreased with the decrease of latitude in the range of 8.044–8.110,whileΩ_(arag) increased with the decrease of latitude in the range of 2.61–3.88,suggesting that the spatial distributions of pH_(T) andΩ_(arag) were out of *** with the present,the predicted values of pH_(T) and Ω_(arag) by the end of this century would decrease remarkedly;larger declines were found in the higher pH_(T) and Ω_(arag) regions,resulting in the differences along the meridional gradient becoming smaller for bothpH_(T) and Ω_(arag).

关键词： ocean acidification carbonate system aragonite saturation state seawater pH Pacific Ocean

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Synthesis and Crystal Structure of Europium Associate(C_(34)H_(54)N_(2)O_(1)0)[Eu(NO_(3))_(5)]

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Journal of Rare Earths 1999年第1期17卷 3-6页

作者： chen, zhaohui Li, Fuyou Jin, Linpei Guo, Jianquan Beijing Normal Univ Beijing China

The title compound, (C 34 H 54 N 2O 10 )[Eu(NO 3) 5](C 34 H 52 N 2O 10 =1,2 bis(2,3 benzo 10 aza 15 crown 5 N ethyleneoxy)ethane), was synthesized in acetonitrile solution and its ... 详细信息

The title compound, (C 34 H 54 N 2O 10 )[Eu(NO 3) 5](C 34 H 52 N 2O 10 =1,2 bis(2,3 benzo 10 aza 15 crown 5 N ethyleneoxy)ethane), was synthesized in acetonitrile solution and its crystal structure was determined by X ray analysis. The crystal crystallizes in monoclinic, space group P21/c with cell parameters a =1 1801(2) nm, b =2 3560(5) nm, c =1 7025(3) nm, β =99 67(3)°, V =4 6662(16) nm 3, Z =4, D c=1 581 g/cm 3. The europium ion is coordinated with ten oxygen atoms from five nitrato groups, and neither O atoms nor N atoms of the macrocyclic compound are bonded to the europium ion.

关键词： Rare earths Macrocyclic compound Ionic associate Crystal structure

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Preparation and Ablation Properties of W/TaC Cermet via in-situ Reaction Sintering Process

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Journal of Wuhan University of Technology(Materials Science) 2018年第2期33卷 431-436页

作者：蒋进明王松 LI Wei chen zhaohui Department of Basics Air Force Engineering University Xi'an 710051 China Science and Technology on Advanced Ceramic Fibers and Composites Laboratory National University of Defense Technology Changsha 410073 China

An attractive way to prepare W/TaC based cermet at a relatively low temperature was proposed and confirmed experimentally. The thermodynamics calculations indicated that the reaction between WC and Ta2O5was feasible at as low a temperature as 1 400 ℃. The experimental results showed that W/TaC cermet could be fabricated by in-situ reaction sintering process at 1400 ℃ for 2 h in vacuum. The open porosity and bulk density of the W/TaC cermet were 15.3% and 13.4 g/cm3. Further, the microstructural features revealed that W, TaC, and Ta2WO8were identified to be the main constituents of the W/TaC cermet. The mass lose rate and linear recession rate of the W/TaC cermet during an oxyacetylene torch test were 0.0048 g/s and 0.0233 mm/s, respectively. The high porosity, the presence of Ta2WO8phases within W/TaC and evaporation of WO3on the surface of the composite contributed to the decrease of ablative property when comparing with pure W.

关键词： sintering composites carbides cermet

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Insight into the effect of gel drying temperature on the structure and desulfurization performance of ZnO/SiO_(2)adsorbents

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Chinese Journal of Chemical Engineering 2023年第4期56卷 233-241页

作者： Chao Yang Zhelin Su Yeshuang Wang Huiling Fan Meisheng Liang zhaohui chen College of Environmental Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China State Key Laboratory of Clean and Efficient Coal Utilization Taiyuan University of TechnologyTaiyuan 030024China State Key Laboratory of Multi-phase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China

A series of ZnO/SiO_(2) adsorbents were prepared by a sol-gel method using tetraethyl orthosilicate,ethylene glycol(EG)and nitrates as *** effect of gel drying temperature on the structure and desulfurization performance of the adsorbents were investigated in *** is found that the low drying temperature led to a weak interaction among EG,Si AOH/H_(2)O and the nitrates in the gel system,which caused the oxidation of EG by NO3-and formed zinc glyoxylate complex during the gel calcination process,whereas this oxidation process also occurred at a high drying temperature during the gel drying *** formed zinc glyoxylate complex promoted the generation of monodentate carbonate on the surface of Zn O,which resulted in the inferior desulfurization performance of adsorbents despite they have smaller Zn O *** gel dried at 120°C formed the hydrogen bonds between EG and Si AOH/H_(2)O and a strong interaction between zinc oxo-clusters and NO3-was also found in the gel system,which avoided the oxidation of EG by NO3-during the preparation process and the Zn O nanoparticles with sizes of 6 nm were formed by a combustion *** adsorbent affords a highest sulfur capacity of 104.9 mg·g^(-1) in this *** addition,the gel drying temperature has a significant influence on the textural properties of the adsorbents except their surface area.

关键词： Sol-gel method Drying temperature H_(2)S removal Zinc-silica composites Hydrogen bonds

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Engineering the efficient three-dimension hollow cubic carbon from vacuum residuum with enhanced mass transfer ability towards H2O2 production

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Chinese Journal of Chemical Engineering 2021年第10期34卷 98-105页

作者： zhaohui chen Yasi Mo Dong Lin Yongxiao Tuo Xiang Feng Yibin Liu Xiaobo chen De chen Chaohe Yang State Key Laboratory of Heavy Oil Processing China University of PetroleumQingdao 266580China Department of Chemical Engineering Norwegian University of Science and TechnologyTrondheim 7491Norway

Constructing efficient carbon material with enhanced mass transfer ability from vacuum residuum(VR)is of prime industrial and scientific ***,we demonstrated a one-pot synthesis of metal-free and highly symmetric hollow carbon cubes(HCCs)using cost-efficient vacuum residuum(VR)as a C/N/S *** multi-techniques such as TEM,SEM,Raman,XPS,and XRD,it is found that the CTAB surfactant plays an important role in emulsifying and forming oil-in-water suspension ***,high aromatics contents in VR favor the formation of HCCs shell by graphitization on the surface of Na Cl ***,heavy metals(e.g.,V,Ni)are not enriched in carbon skeleton due to the unique graphitization *** metal-free HCCs catalyst showed good catalytic stability and high selectivity towards direct and local electrochemical production of hydrogen peroxide(H_(2)O_(2))through two-electron O_(2)reduction due to enhanced mass transfer *** results provide a novel avenue to synthesize metal-free cubic carbon material from low-cost and plentiful VR,which are essential to the design of more efficient catalysts for O_(2)reduction to H_(2)O_(2).

关键词： Electrochemistry Hydrogen peroxide Hollow carbon cube Vacuum residuum Catalyst Selectivity

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Characteristics of oil shale pyrolysis in a two-stage fluidized bed

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Chinese Journal of Chemical Engineering 2018年第2期26卷 407-414页

作者： Yong Tian Mengya Li Dengguo Lai zhaohui chen Shiqiu Gao Guangwen Xu State Key Laboratory of Multi-phase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of ChineseAcademy of Sciences Beijing 100049China Department of Chemical Engineering Tsinghua UniversityBeijing 100084China

Rapid pyrolysis of oil shale coupled with in-situ upgrading of pyrolysis volatiles over oil shale char was studied in a laboratory two-stage fluidized bed(TSFB) to clarify the shale oil yield and quality and their variations with operating conditions. Rapid pyrolysis of oil shale in fluidized bed(FB) obtained shale oil yield higher than the Fischer Assay oil yield at temperatures of 500-600 ℃. The highest yield was 12.7 wt% at 500 ℃ and was about1.3 times of the Fischer Assay oil yield. The heavy fraction(boiling point > 350 ℃) in shale oil at all temperatures from rapid pyrolysis was above 50%. Adding an upper FB of secondary cracking over oil shale char caused the loss of shale oil but improved its quality. Heavy fraction yield decreased significantly and almost disappeared at temperatures above 550 ℃, while the corresponding light fraction(boiling point < 350 ℃) yield dramatically increased. In terms of achieving high light fraction yield, the optimal pyrolysis and also secondary cracking temperatures in TSFB were 600 ℃, at which the shale oil yield decreased by 17.74% but its light fraction yield of 7.07 wt% increased by 86.11% in comparison with FB pyrolysis. The light fraction yield was higher than that of Fischer Assay at all cases in TSFB. Thus, a rapid pyrolysis of oil shale combined with volatile upgrading was important for producing high-quality shale oil with high yield as well.

关键词： Oil shale Pyrolysis Fluidized-bed Upgrading Secondary cracking Reactors

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Recent advances of inorganic phosphates with UV/DUV cutoff edge and large second harmonic response

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Chinese Journal of Structural Chemistry 2023年第3期42卷 35-46页

作者： Boxuan Zhang zhaohui chen Key Laboratory of Oil&Gas Fine Chemicals Ministry of Education and Xinjiang Uyghur Autonomous RegionSchool of Chemical Engineering and TechnologyXinjiang University777 Huarui RoadUrumqi830017China

Phosphates are important candidates for ultraviolet/deep-ultraviolet(UV/DUV)nonlinear optical(NLO)materials by good transparency ability and variability of anion species as well as different coordinated *** have been reported as minerals or NLO materials with abundant condensed anionic *** phosphate-based NLO materials,how to improve the second harmonic generation(SHG)response and birefringence re-mains a great ***,this review analyzes the structure-property relationship of the representative UV/DUV phosphates,and the microscopic mechanism to achieve a balance between the short absorption edge and large SHG response is *** provides a new idea to study the UV/DUV phosphate NLO materials.

关键词： Phosphate NLO properties UV/DUV Structure-property

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Data Quality Control Method of a New Drifting Observation Technology Named Drifting Air-Sea Interface Buoy

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Journal of Ocean University of China 2024年第1期23卷 11-22页

作者： LI Shuo WANG Bin DENG Zeng’an WU Baoqin ZHU Xiande chen zhaohui National Ocean Technology Center Tianjin 300112China School of Marine Science and Technology Tianjin UniversityTianjin 300072China Key Laboratory of Ocean Observation Technology Ministry of Natural ResourcesTianjin 300112China People’s Liberation Army 92859 Tianjin 300061China Physical Oceanography Laboratory Ocean University of ChinaQingdao 266100China

An integral quality control(QC)procedure that integrates various QC methods and considers the design indexes and operational status of the instruments for the observations of drifting air-sea interface buoy was developed in the order of basic in-spection followed by targeted *** innovative method of combining a moving Hampel filter and local anomaly detection com-plies with statistical laws and physical processes,which guarantees the QC performance of meteorological *** sets of observation data were used to verify the applicability and effectiveness of the QC procedure,and the effect was evaluated using the observations of the Kuroshio Extension Observatory buoy as the *** results showed that the outliers in the time series can be correctly identified and processed,and the quality of data improved *** linear correlation between the quality-controlled observations and the reference increased,and the difference *** correlation coefficient of wind speed before and after QC increased from 0.77 to 0.82,and the maximum absolute error decreased by approximately 2.8ms^(-1).In addition,air pressure and relative humidity were optimized by 10^(-3)–10^(-2) orders of *** the sea surface temperature,the weight of coefficients of the continuity test algorithm was optimized based on the sea area of data acquisition,which effectively expanded the applicability of the algorithm.

关键词： drifting air-sea interface buoy quality control oceanic variables meteorological variables continuity test

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The Current Situation, Development, and Prospects of the Iron and Steel Industry in the Process towards the “Dual Carbon” Goals

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Chinese Journal of Urban and Environmental Studies 2023年第2期11卷 44-55页

作者： WEI Wei ZHOU Dianmin chen zhaohui Baowu Clean Energy Co. Ltd.

The iron and steel industry is the largest carbon emitter in China’s manufacturing sector and one of the most important fields in the country’s response to climate change. This paper aims to explain the current situation, technological pathways, and future direction of green and lowcarbon development of the iron and steel industry. According to the carbon emissions of the iron and steel industry, this paper analyzes the relationship between steelmaking technologies and carbon emissions, as well as the transformation trend of the world’s iron and steel industry,finding that China’s iron and steel industry faces both opportunities and challenges. Steel scrap recycling and electric furnace steelmaking technologies, re-electrification, hydrogen metallurgy,resource recycling and by-products, and carbon capture and utilization(CCU) are the main technologies tailored to the transformation pathways, and the optimization of energy consumption structure is an important direction for future development. Therefore, this paper believes that clean energy, as a guarantee for carbon mitigation, will play an increasingly important role in the process towards achieving carbon peaking and carbon neutrality goals(the “dual carbon” goals),in addition to the transformation of metallurgical technologies.

关键词： Iron and steel industry carbon peaking carbon neutrality green development

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Carbon Nitride with Single-Atom Nickel as Co-Catalyst for Visible-Light Promoted C—O Coupling

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Chinese Journal of Chemistry 2023年第23期41卷 3281-3289页

作者： En Zhao Lijie chen Qi Zhu zhaohui chen Yanping Wei Wenjun Zhang Lin Dong Weiwei Fang Zupeng chen Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsCollege of Chemical EngineeringNanjing Forestry UniversityNanjingJiangsu210037 China College of Science Gansu Agricultural UniversityLanzhouGansu730070 China

Solar-driven cross-coupling reactions by dual nickel/photocatalysis under mild conditions have received considerable ***,the existing photo/nickel dual catalytic cross-coupling reactions require the addition of expensive photosensitizers and organic ligands,and the catalytic activity is ***,we report a nickel single-atom heterogeneous catalyst supported on mesoporous carbon nitride for photocatalytic C—O coupling reaction between 4-bromobenzonitrile and ethanol,affording 4-ethoxybenzonitrile in excellent yield compared to a semi-heterogeneous catalytic *** catalytic system exhibits a broad substrate scope including ketones,aldehydes,esters,and *** work presents a simple and cost-effective strategy for anchoring metal single atoms onto carbon nitride,providing a new platform for enabling high-performance photocatalytic production of aryl ether compounds.

关键词： Photocatalysis C—O cross-coupling Single-atom catalysts Nickel catalysis Sustainable chemistry

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