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Redistributing Cu species in Cu-SSZ-13 zeolite as NH3-SCR catalyst via a simple ion-exchange

Chinese Journal of Chemical Engineering 2022年第1期35卷 329-341页

作者： Ben Liu Nangui Lv Chan Wang Hongwei Zhang Yuanyuan Yue Jingdong Xu Xiaotao Bi Xiaojun Bao National Engineering Research Center of Chemical Fertilizer catalyst College of Chemical EngineeringFuzhou UniversityFuzhou 350002China Qingyuan Innovation Laboratory Quanzhou 362801China Sinochem Quanzhou Energy Technology Co LtdQuanzhou 362000China Department of Chemical&Biological Engineering University of British Columbia2360 East MallVancouverBC V6T 1Z3Canada State Key Laboratory of Photocatalysis on Energy&Environment College of ChemistryFuzhou UniversityFuzhou 350116China

The nature and distribution of Cu species in Cu-SSZ-13 play a vital role in selective catalytic reduction of NO by NH3(NH3-SCR),but existing methods for adjusting the Cu distribution are complex and difficult to ***,we report a simple and effective ion-exchange approach to regulate the Cu distribution in the one-pot synthesized Cu-SSZ-13 that possesses sufficient initial Cu species and thus provides a“natural environment”for adjusting Cu distribution *** using this proposed strategy,a series of Cu-SSZ-13x zeolites with different Cu contents and distributions were *** is shown that the dealumination of the as-synthesized Cu-SSZ-13 during the ion-exchange generates abundant vacant sites in the double six-membered-rings of the SSZ-13 zeolite for relocating Cu2+species and thus allows the redistribution of the Cu *** catalytic results showed that the ion-exchanged Cu-SSZ-13 zeolites exhibit quite different catalytic performance in NH3-SCR reaction but superior to the parent *** structure–activity relationship analysis indicates that the redistribution of Cu species rather than other factors(e.g.,crystallinity,chemical composition,and porous structure)is responsible for the improved NH3-SCR performance and SO_(2) and H_(2)O *** work offers an effective method to precisely adjust the Cu distribution in preparing the industrial SCR catalysts.

关键词： catalyst Zeolite Cu-SSZ-13 Ion-exchange Redistribution of Cu species Selective catalytic reduction(SCR)

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Influence of coke rate on thermal treatment of waste selective catalytic reduction(SCR)catalyst during iron ore sintering

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Chinese Journal of Chemical Engineering 2022年第2期35卷 415-423页

作者： Pengnan Ma Jiankang Wang Hanxiao Meng Laiquan Lv Hao Fang Kefa Cen Hao Zhou State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou 310027China

Waste selective catalytic reduction(SCR)catalyst as a hazardous waste has a significant impact on the environment and human *** present study,a novel technology for thermal treatment of waste SCR catalyst was proposed by adding it to sinter mix for iron ore *** influences of coke rate on the flame front propagation,sinter microstructure,and sinter quality during sintering co-processing the waste SCR catalyst process were *** situ tests results indicated the maximum sintering bed temperature increased at higher coke rate,indicating more liquid phase generated and higher airflow *** sintering time was longer and the calculated flame front speed dropped at higher coke *** microstructure results found the coalescence and reshaping of bubbles were more fully with increasing coke *** porosity dropped from 35.28%to 25.66%,the pore average diameter of large pores decreased from 383.76μm to 311.43μ*** increasing coke rate,the sinter indexes of tumbler index,productivity,and yield,increased from 33.2%,9.2 t·m^(-2)·d^(-1),28.9%to 58.0%,36.0 t·m^(-2)·d^(-1),68.9%,***,a comprehensive index was introduced to systematically assess the influence of coke rate on sinter quality,which rose from 100 to 200 when coke rate was increased from 3.5%(mass)to 5.5%(mass).

关键词： Flame front Waste selective catalytic reduction(SCR) catalyst Thermal treatment Iron ore sintering

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Efficient hydrogenation of furfural to furfuryl alcohol by magnetically recoverable RuCo bimetallic catalyst

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Green Energy & Environment 2022年第2期7卷 275-287页

作者： Yongxing Wang Tianyu Gao Yaowei Lu Yinghao Wang Qiue Cao Wenhao Fang School of Chemical Science and Technology Key Laboratory of Medicinal Chemistry for Natural Resource-Ministry of EducationYunnan UniversityKunming650091China National Demonstration Center for Experimental Chemistry and Chemical Engineering Education Yunnan UniversityKunming650091China

A magnetically recoverable Ru Co bimetallic catalyst was reported for the catalytic hydrogenation of furfural to furfuryl alcohol under ambient H_(2) *** magnetic catalyst was prepared by H_(2) treatment of the Ru Co composite precursor from a facile one-pot hydrolysis of Co and Ru salts by NaBH_(4) *** catalyst can totally convert furfural to 98–100% furfuryl alcohol at 120°C under 1 bar H_(2) in isopropanol or water using only molecular H_(2) as hydrogen ***,the catalyst showed excellent stability during recycling test and can be easily and completely recovered by magnet from reaction *** influence of Ru/Co ratio and H_(2)-treatment temperature was studied,which were shown to be important for the structural evolution and the metal interaction in Ru Co active sites,based on the comprehensive characterizations including XRD,TGA,TEM,XPS,H_(2)-TPR,CO adsorbed *** was demonstrated that the cooperative Ru~0–Co~0 bimetallic active sites in strong interaction can significantly promote activity and selectivity of the catalyst due to an enhanced adsorption and activation of furfural and H_(2),and simultaneously created a strong magnetism in the Ru Co catalyst for simple physical separation.

关键词： solution catalyst alcohol

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Influence of zinc state on the catalyst properties of Zn/HZSM-5 zeolite in 1-hexene aromatization and cyclohexane dehydrogenation

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Chinese Journal of Chemical Engineering 2022年第3期35卷 124-134页

作者： Di Gao Yibo Zhi Liyuan Cao Liang Zhao Jinsen Gao Chunming Xu Mingzhi Ma Pengfei Hao State Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing)Beijing 102249China Hebei Jingzhi Technology Company Limited Cangzhou 061000China

Rational design of Zn-containing HZSM-5 zeolite(Zn/HZSM-5)with high reactivity and excellent aromatization performance for olefin aromatization is crucially *** develop a new and uncomplicated method to synthesize Zn/HZSM-5(IMX/Z5)with superior aromatization performance in the *** to incipient wetness impregnation(IMP/Z5)and mechanical mixing(MIX/Z5),the asprepared IMX/Z5 presents a higher amount of surface ZnOH^(+)species(2.87%)while keeping identical bulk zinc *** a result,more surface ZnOH^(+)favor both the aromatization of 1-hexene and cyclohexane *** the two olefin aromatization pathways(hydrogen transfer and dehydrogenation),it is the first time found both the hydrogen transfer ability and the dehydrogenation ability increase linearly with the amount of surface ZnOH^(+)species while keeping identical bulk zinc *** believe that the linear relationships are essential to design next generation olefin aromatization catalysts.

关键词： Zinc state catalyst Catalysis Hydrogen transfer Dehydrogenation Moleclar sieves

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YC_(x)F_(y)nanosheets-supported Ni nanoparticles as a high-efficient catalyst for hydrogen desorption of MgH_(2)

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Nano Research 2023年第8期16卷 10938-10945页

作者： Cong Peng Qingan Zhang School of Materials Science and Engineering Anhui University of TechnologyMaanshan 243002China

Magnesium hydride(MgH_(2))has been considered as a promising hydrogen storage material,but the pressing issues including sluggish kinetics and poor cyclic stability hampered its practical ***,a high-efficient catalyst comprising of YC_(x)F_(y)nanosheets-supported Ni nanoparticles(Ni_(30)/YC_(x)F_(y))was designed and constructed aiming to resolve the abovementioned restrictions facing MgH_(2).After hybridizing with Ni_(30)/YC_(x)F_(y),the as-achieved MgH_(2)–10 wt.%Ni_(30)/YC_(x)F_(y)composite exhibits superior hydrogen desorption kinetics with an activation energy of 80.9 kJ·mol^(−1)and a high capacity retention of 97.6%after 50 *** is confirmed that the in situ formed Mg_(2)NiH_(4)and YH3 catalytic phases accelerate the hydrogen desorption kinetics,while the dispersed MgF_(2)and carbon species prevent the crystallite growth,particle aggregation,and catalyst redispersion,contributing an excellent cyclic *** work provides a new strategy to synthesize efficient catalysts for hydrogen desorption of MgH_(2).

关键词： hydrogen storage magnesium hydride catalyst kinetics cyclic stability

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nNPipe: a neural network pipeline for automated analysis of morphologically diverse catalyst systems

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npj Computational Materials 2023年第1期9卷 2176-2187页

作者： Kevin P.Treder Chen Huang Cameron G.Bell Thomas J.A.Slater Manfred E.Schuster DoğanÖzkaya Judy S.Kim Angus I.Kirkland Department of Materials University of OxfordParks RoadOX13PH OxfordOxfordshireUnited Kingdom Rosalind Franklin Institute Harwell Research CampusOX110FA DidcotOxfordshireUnited Kingdom School of Chemistry The University of EdinburghEH93FJ EdinburghUnited Kingdom School of Chemistry Cardiff UniversityPark PlaceCF103AT CardiffUnited Kingdom Electron Physical Sciences Imaging Centre Diamond Light SourceOxfordshire OX110DEUnited Kingdom Johnson Matthey Technology Centre Blount’s CourtSonning CommonReading RG49NHUnited Kingdom

We describe nNPipe for the automated analysis of morphologically diverse catalyst materials. Automated imaging routines anddirect-electron detectors have enabled the collection of large data stacks over a wide range of sample positions at high temporalresolution. Simultaneously, traditional image analysis approaches are slow and hence unsuitable for large data stacks andconsequently, researchers have progressively turned towards machine learning and deep learning approaches. Previous studiesoften detail work on morphologically uniform material systems with clearly discernible features, limited workable image sizes andtraining data that may be biased due to manual labelling. The nNPipe data-processing method consists of two standaloneconvolutional neural networks that were exclusively trained on multislice image simulations and enables fast analysis of2048 × 2048 pixel images. Inference performance compared between idealised and real industrial catalytic samples and insightsderived from subsequent data analysis are placed into the context of an automated imaging scenario.

关键词： catalyst hence subsequent

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Oxygen vacancies enriched Ni-Co/SiO_(2)@CeO_(2) redox catalyst for cycling methane partial oxidation and CO_(2) splitting

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Chinese Journal of Chemical Engineering 2023年第11期63卷 235-245页

作者： Chang Yang Juping Zhang Jiakai Wang Dongfang Li Kongzhai Li Xing Zhu State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Faculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093China

Redox catalysts play a vital role in the interconversion of two significant greenhouse gases,CO_(2)and CH_(4),via chemical looping methane dry reforming ***,a series of transition metals-alloyed and core-shell structured Ni-M/SiO_(2)@CeO_(2)(M=Fe,Co,Cu,Mn,Zr)redox catalyst were fabricated and evaluated in a gas-solid fixed-bed reactor for cycling CH_(4)partial oxidation(PO_(x))and CO_(2)*** catalysts are composed of spherical SiO_(2)core and CeO_(2)shell,and the highly dispersed Ni alloy nanoparticles are the interlayer between core and *** oxygen vacancy concentration of Ni-M/SiO_(2)@CeO_(2)followed the order of Co>Cu>Fe>Mn>Zr,and Ni alloying with transition metals significantly enhanced oxygen storage capacity(OSC).Ni-Co/SiO_(2)@CeO_(2)catalyst with abundant oxygen vacancies and a high OSC showed the lowest temperatures of CH_(4)activation(610℃)and CO_(2)decomposition(590℃),thus demonstrating excellent redox *** catalyst exhibited superior activity and structural stability in the continuous CH_(4)/CO_(2)redox cycles at 615℃,achieving 87%CH_(4)conversion and 83%CO *** proposed catalyst shows great potential for the utilization of CH_(4)and CO_(2)in a redox mode,providing a new sight for design redox catalyst in chemical looping or related fields.

关键词： Chemical looping Methane Dry reforming catalyst Partial Oxidation

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In situ coupled MoO_(3)with CoP/rGO to construct three-dimensional self-supported catalyst for highly efficient alkaline hydrogen evolution reaction

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Journal of Materials Science & Technology 2022年第9期104卷 194-201页

作者： Zhuoran Hou Di Yang Yuntao Xin Haoyu Huang Xin Hu Yuyang Guo Siduo Wu Liwen Hu College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and Advanced Materials Chongqing UniversityChongqing 400044China

In order to solve the crisis of energy depletion and protect the beautiful natural environment,the development of efficient,cost-effective and stable hydrogen evolution reaction(HER)electrocatalyst has attracted great attention,but it is still an urgent challenge to fabricate an abundant and low cost *** this article,a novel HER catalyst with heterogeneous structure interfaces was in situ synthesized by multi-step electrodeposition method,and the mechanism of the enhancement of its electrocatalytic activity was elucidated by the combination of density functional theory(DFT)calculation and *** initial overpotential is only 83 mV and the Tafel slope is only 58.5 mV/dec,which is better than most of other reported CoP-based *** the meantime,DFT calculations show that the incorporation of MoO_(3)and rGO leads to electron redistribution among different components,which ensures efficient adsorption and activation of H_(2)O molecules and hydrogen ***,this work will contribute to the understanding of the mechanisms associated with heterojunctions and provide guidance for the rational design of a hybrid catalyst.

关键词： catalyst alkaline rational

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Performance improvement of ultra-low Pt proton exchange membrane fuel cell by catalyst layer structure optimization

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Chinese Journal of Chemical Engineering 2022年第1期35卷 473-479页

作者： Jinyan Xi Kang Meng Ying Li Meng Wang Qiang Liao Zidong Wei Minhua Shao Jianchuan Wang School of Chemistry&Chemical Engineering Chongqing UniversityChongqing 400044China School of Energy and Power Engineering Chongqing UniversityChongqing 400044China School of Chemistry and Bioengineering HongKong University of Science and TechnologyHong KongChina

Reducing the loading of noble Pt-based catalyst is vital for the commercialization of proton exchange membrane fuel cell(PEMFC),However,severe mass transfer polarization loss resulting in fuel cell performance decline will be encountered in ultra-low Pt *** this work,mild oxidized multiwalled carbon nanotubes(mMWCNT)were adopted to construct the catalyst layer,and by varying the loading of carbon nanotubes,the catalyst layer structure was optimized.A high peak power density of 1.23 W·cm^(-2) for the MEA with mMWCNT was obtained at an ultra-low loading of 120μg·cm^(-2) Pt/PtRu(both cathode and anode),which was 44.7%higher than that of MEA without *** catalyst dispersion,low charge transfer resistance,more porous structure and high hydrophobicity of catalyst layer were ascribed for the reasons of the performance improvement.

关键词： catalyst Mass transfer Optimization Fuel cell Ultra-low platinum Carbon nanotubes

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Coupling effect of bifunctional ZnCe@SBA-15 catalyst in 1,3-butadiene production from bioethanol

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Chinese Journal of Chemical Engineering 2022年第5期35卷 162-170页

作者： Zheng Wang Sijia Li Shengping Wang Jiaxu Liu Yujun Zhao Xinbin Ma Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyCollaborative Innovation Center of Chemical Science and EngineeringTianjin UniversityTianjin 300072China State Key Laboratory of Fine Chemicals Department of Catalytic Chemistry and EngineeringDalian University of TechnologyDalian 116024China

A series of bifunctional Zn Ce@SBA-15 catalysts with different Zn/Ce ratios were prepared by a solid-state grinding strategy and used in the conversion of ethanol to 1,3-butadiene(ETB).For the supported metal oxides,Zn O serves as the active sites for the dehydrogenation of ethanol,and CeO_(2) promotes the aldolcondensation *** on the results of Py-FTIR and NH_(3)-TPD,it suggests that the yield of 1,3-butadiene is positively correlated with the number of weak Lewis acid sites on the catalyst surface,given their benefit for aldol-condensation *** catalyst with an optimal Zn/Ce ratio of about 1:5 has the highest concentration of weak Lewis *** with the Zn O sites,it contributes to a 98.4%conversion of ethanol and a 45.2%selective of 1,3-butadiene under relatively mild reaction conditions(375°C,101.325 k Pa,and 0.54 h^(-1)).

关键词： Biomass catalyst Coupling effect Lewis acid 1 3-butadiene Optimization

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