Zeolite-encaged Ultrasmall Pt-Zn Species with Trace Amount of Pt for Efficient Propane Dehydrogenation

查看全文 作　　者：QU [1]Ziqiang;ZHANG [2]Tianjun;YIN [1]Xichen;ZHANG [3]Junyi;XIONG [4]Xiaoyun;SUN [1]Qiming

机构地区：[1]Innovation Center for Chemical Science,College of Chemistry,Chemical Engineering and Materials Science,Jiangsu Key Laboratory of Advanced Negative Carbon Technologies,Soochow University,Suzhou 215123,P.R.China;[2]College of Chemistry and Materials Science,Hebei University,Baoding 071002,P.R.China;[3]PetroChina Lanzhou Petrochemical Company,Lanzhou 730000,P.R.China;[4]Lanzhou Petrochemical Research Center,Petrochemical Research Institute,PetroChina,Lanzhou 730000,P.R.China

出　　处：《Chemical Research in Chinese Universities》索引2023年第39卷第6期,共7页

基　　金：supported by the National Key R&D Program of China(No.2022YFA1506000);the Technology Development Project from SINOPEC(No.LZSH-2022-JS-81);the Natural Science Foundation of Jiangsu Province,China(No.BK20210698);the Jiangsu Distinguished Professor Program,China and the Gusu Innovation and Entrepreneurship Leading Talents Program,China(No.ZXL2022497). 摘　　要：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 utilization.Herein,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 method.Interestingly,the extremely low amount of Pt can significantly promote the activity of zeolite-encaged Zn catalysts in PDH reactions.Thanks 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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Zeolite-encaged Ultrasmall Pt-Zn Species with Trace Amount of Pt for Efficient Propane Dehydrogenation

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