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H2 production by ethanol decomposition with a gliding arc discharge plasma reactor

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Frontiers of Chemical Science and Engineering 2013年第2期7卷 145-153页

作者： Baowei WANG Wenjie GE Yijun LV wenjuan yan Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

A gliding arc discharge （GRD） reactor was used to decompose ethanol into primarily H2 and CO with small amounts of CH4, C2H2, C2H4, and C2H6. The ethanol concentration, electrode gap, input voltage and Ar flow rate all affected the conversion of ethanol with results ranging from 40.7% to 58.0%. Interestingly, for all experimental conditions the SH2/Sco selectivity ratio was quite stable at around 1.03. The mechanism for the decomposition of ethanol is also described.

关键词： gliding arc discharge ethanol hydrogen,decomposition plasma

Cross-metathesis of biomass to olefins:Molecular catalysis bridging the gap between fossil and bio-energy

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Chinese Journal of Chemical Engineering 2022年第8期35卷 44-60页

作者： wenjuan yan Zhenchao You Kexin Meng Feng Du Shuxia Zhang Xin Jin State Key Laboratory of Heavy Oil Processing Center for Chemical Engineering Experimental TeachingChina University of PetroleumQingdao 266580China

Terminal olefins are important building blocks for the industry of biofuels,oligomers,and lubricants *** industrial processes for production of olefins involving oligomerization of ethylene or cracking of petrochemical waxes have several flaws including low yield and high cost in product ***-metathesis of bio-derived unsaturated fatty esters and olefins with ethylene(ethenolysis),allows the conversion of sustainable waste biomass to various renewable olefins with much safer,less toxic,sustainable,and zero-CO_(2) emission *** our best knowledge,however,a comprehensive summary of key advances in this field(since 2017)is yet to be available,particularly on molecular features of homogeneous and heterogeneous *** paper presents a critical review on molecular structures of metal complex and oxide catalysts for ethenolysis of olefins and *** influence of cationic centers,coordination conditions,nature of ligands,operating conditions on catalyst performances will be systematically discussed along with relevant reaction *** key challenges for rational design of coordinated cationic hybrids have been summarized,which will provide insights to technological advancement of large-scale production of oleochemical-derived olefins.

关键词： Metathesis Catalysts Metal complex Metal oxide Olefins Oleochemicals

Selective propylene epoxidation in liquid phase using highly dispersed Nb catalysts incorporated in mesoporous silicates

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Chinese Journal of Chemical Engineering 2018年第6期26卷 1278-1284页

作者： wenjuan yan Yuhui Wu Xiang Feng Chaohe yang Xin Jin Jian Shen State Key Laboratory of Heavy Oil Processing College of Chemical EngineeringChina University of Petroleum Department of Environmental Science and Engineering Xiangtan University

Selective propylene epoxidation to propylene oxide(PO) with hydrogen peroxide(H_2O_2) was carried out in a catalytic semi-batch *** propylene epoxidation activity(44 h^(-1)) was observed over Nb based mesoporous silicate materials Nb-TUD-1 under mild operating *** physical and chemical properties of the Nb based silicates characterized using BET,FTIR,TPD,TEM and UV–Vis revealed that the site isolation and surface acidity are crucial for PO *** synthesis methods were investigated for their effects on PO productivity,PO selectivity and H_2O_2 utilization *** is found that Nb-TUD-1 material synthesized by the sol–gel method is more active and selective than impregnated materials for liquid phase propylene *** characterization confirms that thus synthesized Nb-TUD-1 catalysts have more Lewis acidity and less Bronsted acidity compared to the catalysts by impregnation.

关键词： Propylene Epoxidation Propylene oxide TUD-1 Niobium mesoporous materials

Highly dispersed metal incorporated hexagonal mesoporous silicates for catalytic cyclohexanone oxidation to adipic acid

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Chinese Journal of Chemical Engineering 2020年第10期28卷 2542-2548页

作者： wenjuan yan Wenxiang Zhang Qi Xia Shuaishuai Wang Shuxia Zhang Jian Shen Xin Jin State Key Laboratory of Heavy Oil Processing Center for Chemical Engineering Experimental TeachingChina University of PetroleumQingdao 266580China College of Environment and Resources Xiangtan UniversityXiangtan 411105China

Adipic acid is a dicarboxylic acid of great industrial importance,mainly used in the production of nylon-6,6 and *** use of nitric acid as an oxidant in the industrial production of adipic acid poses significant carbon footprint to the *** adipic acid synthesis methods using a heterogeneous catalyst with H2O2 as oxidant and water as solvent have potential advantages of low catalyst cost,easy synthesis and recovery,cleanness and environmental *** this work,hexagonal mesoporous silicate materials were synthesized by a sol–gel method and evaluated for cyclohexanol/cyclohexanone oxidation to adipic *** physical and chemical properties of Fe-HMS were characterized by XRD,HR-TEM,BET and UV–*** experimental results showed that Fe-HMS materials show pore sizes ranging from 2–3 nm.W-and Mo-based polyoxometalates were also evaluated and compared to the Fe-based HMS *** improve the adipic acid yield,the influence of the transition metal as well as the effect of metal loading,reaction temperature and catalyst amount on the catalytic performances of Fe-HMS have been investigated in *** Si/Fe atomic ratio=100,Fe-HMS catalyst shows the highest activity,with a cyclohexanone conversion of 92.3%and adipic acid selectivity of 29.4%.The reaction pathway of cyclohexanone oxidation was further proposed based on experimental data.

关键词： Oxidation Adipic acid Hexagonal mesoporous silicates hydrogen peroxide

Synthesis of PtCu-based nanocatalysts:Fundamentals and emerging challenges in energy conversion

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Journal of Energy Chemistry 2022年第1期31卷 583-606,I0015页

作者： wenjuan yan Dongpei Zhang Quanxing Zhang Yu Sun Shuxia Zhang Feng Du Xin Jin State Key Laboratory of Heavy Oil Processing Center for Chemical Engineering Experimental TeachingChina University of PetroleumQingdao 266580ShandongChina

Proton exchange membrane fuel cell and direct methanol fuel cells have gained more attention due to high-energy density,remarkable conversion efficiency,and low ***,their widely practical application was hindered by the high usage,limited sources,and high price of Pt *** achieve more cost-effective catalytic systems,PtCu-based multi-metallic nanoparticles are highly efficient for the oxygen reduction reaction(ORR)and methanol oxidation reaction(MOR).The incorporation of non-noble Cu metal can alter the properties of hybrids by forming new facets,planes,edges to promote the cleavage or formation of chemical bonds in catalytic *** is a rapid growing area with numerous contributions from the interdisciplinary areas of *** paper has summarized the recent progress in the past two years,in synthesizing PtCu-based alloys with various composition and morphologies,and critically discussed the effect of the catalyst preparation method,metal precursor,surfactant,reductant and heating temperature on nanostructure and electronic *** important role of the composition,size,and morphology of PtCu bimetallic catalysts for electro oxidation reactions has been further established for structure-dependency *** challenges and perspectives of nanocatalysts for ORR and MOR discussed in this work is to provide further insights into rational design for cost-effective materials for energy.

关键词： PtCu Nanostructure Electrocatalysis Oxidation

PtCo-based nanocatalyst for oxygen reduction reaction:Recent highlights on synthesis strategy and catalytic mechanism

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Chinese Journal of Chemical Engineering 2023年第1期53卷 101-123页

作者： wenjuan yan Puhua Sun Chen Luo Xingfan Xia Zhifei Liu Yuming Zhao Shuxia Zhang Liang Sun Feng Du State Key Laboratory of Heavy Oil Processing Center for Chemical Engineering Experimental TeachingOil Industry Training CenterChina University of PetroleumQingdao 266580China Petrochemical Research Institute PetroChinaBeijing 102200China

Oxygen reduction reaction over Pt-based catalyst is one of the most significant cathode reactions in fuel ***,low reserves and high price of Pt have motivated researchers worldwide seeking enhanced utilization efficiency and durability by doping non-noble metals to form Pt-based alloy *** Pt with Co has been recognized as one of the most effective approaches to achieve this *** bimetal combination is one of the most promising candidates to synthesize highly efficient catalysts for oxygen reduction reaction(ORR)applications,owing to its relatively more suitable oxygen binding energy for four-electron transfer ***,impressive strategies have been developed to fabricate more active and stable PtCo-based multimetallic alloys with tailorable size and *** paper aims to summarize the most recent highlights on the study of the relationship between preparation strategies,morphologies,electroactivities of the PtCo-based catalyst at atomic level and further the relevant reaction *** challenges and opportunities on the further development of electrocatalysts for fuel cells are included to provide reference for the practical application.

关键词： Electrochemistry Catalysis Oxygen reduction reaction Fuel cells PtCo nanoalloy Multimetallic

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财政分权、政府竞争与环境治理投资

财贸研究 2012年第5期23卷 91-97页

作者：闫文娟南开大学经济学院天津300071

基于中国省际面板数据,重点考察由于政府竞争财政分权是否明显削弱了环境治理投资,验证财政分权以及财政分权通过政府竞争这两个渠道对中国省级政府环境治理投资的负面影响。通过对废水、废气、固体废物的省级面板数据采用系统GMM方法... 详细信息

基于中国省际面板数据,重点考察由于政府竞争财政分权是否明显削弱了环境治理投资,验证财政分权以及财政分权通过政府竞争这两个渠道对中国省级政府环境治理投资的负面影响。通过对废水、废气、固体废物的省级面板数据采用系统GMM方法进行实证检验,发现财政分权通过政府竞争显著减少了环境治理投资,财政分权并不是环境治理投资偏低的主要原因,关键是由于政府竞争,财政分权对环境治理投资的负面影响被明显放大了。

关键词：财政分权政府竞争环境治理投资

Metal-Organic Frameworks as Cathode Materials for Li-O2 Batteries

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Metal-Organic Frameworks as Cathode Materials for Li-O2 Batt...

环境规制与出口强度——基于两控区政策的考察

中国化学会第八届全国配位化学会议

作者： Doufeng Wu wenjuan yan Yi Qi Jinxi Chen Qiaowei Li Department of Chemistry Fudan University School of Chemistry and Chemical Engineering Southeast University

A primary capacity of 9420 mA h g under 1 atm of oxygen was achieved in a Li-O battery based on the robust Mn-MOF-74,more than four times higher than the value obtained in a cell without an *** accessible open metal sites in the uniform channels enhance the population of O molecules in the pores,and assist the reaction efficiently towards high *** findings indicate that MOFs represent a viable option as cathode materials in Li-O *** diversity of MOFs and the facility with which their organic links and multi-metal building units can be varied should lend many advantages in crafting electrode *** further investigated the MOF downsizing effect on the Li-O battery *** sizes of the MOF-74 can be precisely and uniformly controlled from several unit cell lengths to 1400 *** the use of modulators,the high porosity and the subsequent O adsorption uptake still remain(874 m g surface area for Co-MOF-74-20 with 9.6 cm g O uptake at 1 atm).The CoMOF-74-20 based Li-O batteries attained a capacity of 11350 mA h g at 100 mA g and 6440 mAh g at 500 mA *** addition to the high density of unsaturatedactive sites for electrochemistry,as provided by the MOF skeleton itself,the size confinement and inherent defects of the nanocrystals have further offered efficient diffusion paths with lowered transport barriers,contributing to their high performance in Li-O batteries.

关键词： metal-organic framework Li-O2 batteries cathodematerials high capacity

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财经论丛 2018年第8期 97-105页

作者：闫文娟郭树龙西安工业大学经济管理学院陕西西安710032 天津财经大学商学院天津300222

基于两控区政策这一准自然实验,本文采用倍差法和三重差分法研究两控区政策对高排硫行业出口强度的影响效应及该影响效应的地区差异和所有制差异。研究结果表明,两控区政策对高污染行业的出口强度没有显著影响,但抑制了高排硫行业的出... 详细信息

基于两控区政策这一准自然实验,本文采用倍差法和三重差分法研究两控区政策对高排硫行业出口强度的影响效应及该影响效应的地区差异和所有制差异。研究结果表明,两控区政策对高污染行业的出口强度没有显著影响,但抑制了高排硫行业的出口强度并存在滞后效应,更换政策实施年份进行安慰剂检验后结果依然稳健。两控区政策对非国有企业的出口强度具有显著负向影响,对国有企业的出口强度具有正向影响。两控区政策对出口强度的影响效应在东部和中部地区较为明显,在西部地区并不显著。以上结论为我国环境、外贸政策的合理制定及有效实施提供必要的经验支持和决策依据。

关键词：两控区政策出口强度环境规制