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Highly active zigzag-like pt-zn alloy nanowires with high-index facets for alcohol electrooxidation

Nano Research 2019年第5期12卷 1173-1179页

作者： Yanchao Xu Xiaoqiang Cui Shuting Wei Qinghua Zhang Lin Gu Fanqi Meng Jinchang Fan Weitao Zheng State Key Laboratory of Automotive Simulation and Control School of Materials Science and EngineeringKey Laboratory of Automobile Materials of MOE and Jilin UniversityChangchun 130012China Laboratory of Advanced Materials and Electron Microscopy Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China

The development of highly efficient pt-based alloy nanocatalysts is important but remains challenging for fuel cells ***,a new class of zigzag-like platinum-zinc (pt-zn) alloy nanowires (NWs) with rough surface and controllable composition is *** merits of anisotropic one-dimensional nanostructure,stable high-index facets and coordinatively unsaturated pt sites endow the composition-optimal pt94zn6 NWs with a mass activity of 7.2 and 6.2 times higher than that of commercial pt black catalysts toward methanol/ethanol oxidation,***-induced d-band electron modulation and lattice strain effects weaken the adsorption strength of poisoning species,which originally enhances the catalytic activity of pt-zn *** study provides a new perspective of pt-zn electrocatalysts with intrinsic mechanism for enhanced catalytic performance.

关键词： pt-zn nanowires zigzag-like high-index facets d-band center strain effects alcohol oxidation

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Zeolite-encaged Ultrasmall pt-zn Species with Trace Amount of pt for Efficient Propane Dehydrogenation

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Chemical Research in Chinese Universities 2023年第6期39卷 870-876页

作者： QU Ziqiang ZHANG Tianjun YIN Xichen ZHANG Junyi XIONG Xiaoyun SUN Qiming Innovation Center for Chemical Science College of ChemistryChemical Engineering and Materials ScienceJiangsu Key Laboratory of Advanced Negative Carbon TechnologiesSoochow UniversitySuzhou 215123P.R.China College of Chemistry and Materials Science Hebei UniversityBaoding 071002P.R.China PetroChina Lanzhou Petrochemical Company Lanzhou 730000P.R.China Lanzhou Petrochemical Research Center Petrochemical Research InstitutePetroChinaLanzhou 730000P.R.China

Propane dehydrogenation(PDH)has become a globe-welcoming technology to meet the massive demand for propylene,but the most commonly used pt-based catalysts suffer from quick sintering,poor selectivity for propylene,and unsatisfied pt ***,a series of Silicalite-1(S-1)zeolite-encaged ultrasmall pt-zn clusters with a trace amount of pt[40—180 ppm(parts per million)]were developed by using a one-pot ligand-protected direct H_(2) reduction ***,the extremely low amount of pt can significantly promote the activity of zeolite-encaged zn catalysts in PDH *** to the high pt dispersion,the synergy between pt and zn species,and the confinement effect of zeolites,the optimized ptzn@S-1 catalyst with 180 ppm pt and 1.88%(mass fraction)zn,exhibited an extraordinarily high propane conversion(33.9%)and propylene selectivity(99.5%)at 550℃with a weight hourly space velocity(WHSV)of 8 h^(-1),affording an extremely high propylene formation rate of 340.7 mol_(C_(3)H_(6))·g_(pt^(-1))·h^(-1).This work provides a reference for the preparation of zeolite-encaged metal catalysts with high activity and noble metal utilization in PDH reactions.

关键词： Propane dehydrogenation Zeolite Confinement effect Bimetallic catalyst pt-zn

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