载体晶面诱导的Pt-Sn合金及其丙烷脱氢研究  

Controllable preparation of stable Pt-Sn alloy induced by support crystal plane and study on its application in propane dehydrogenation

作　　者：刘雅楠 郑天赐 宋远飞 翁少霞 李殿卿[1,2] LIU Ya-nan;ZHENG Tian-ci;SONG Yuan-fei;WENG Shao-xia;LI Dian-qing(State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Quzhou Institute for Innovation in Resource Chemical Industry,Quzhou 324000,China)

机构地区：[1]北京化工大学化工资源有效利用国家重点实验室,北京100029 [2]衢州资源化工创新研究院,浙江衢州324000

出　　处：《现代化工》2024年第9期103-108,113,共7页Modern Chemical Industry

基　　金：国家自然科学基金项目(22278017);中央高校基本科研业务费专项资金资助(JD2408)。

摘　　要：针对传统浸渍过程中Sn与氧化铝载体易于形成铝酸锡络合物,在反应过程中Pt-Sn合金结构易偏析的问题,利用Al_(2)O_(3)择优暴露晶面诱导效应构筑稳定的Pt-Sn/Al_(2)O_(3)有序合金催化剂。通过丙烷脱氢性能评价发现,棒状r-Al_(2)O_(3)负载的Pt-Sn催化剂形成了均匀且结构稳定的有序合金结构。在560℃时,丙烷初始转化率达68%,丙烯选择性大于97%,远高于其他氧化铝载体负载的Pt-Sn催化剂。利用SEM、STEM和CO-IR等对系列催化剂结构进行表征,结果表明,Pt-Sn/r-Al_(2)O_(3)中形成了隔离且电子富集的Pt物种,从而促进了C—H的活化及丙烯的脱附。Sn and alumina supports are prone to form aluminate tin complexes during traditional impregnation process,thus Pt-Sn alloy structure is prone to segregation.In order to solve this problem,a stable Pt-Sn/Al_(2)O_(3) ordered alloy catalyst is constructed by means of the induced effect of preferential exposed facets of Al_(2)O_(3).Through the catalytic performance evaluation in propane dehydrogenation,it is found that rod-shaped Al_(2)O_(3) supported Pt-Sn catalyst forms a uniform and structurally stable ordered alloy structure.At 560℃,initial conversion of propane over Pt-Sn/Al_(2)O_(3) catalyst reaches 68%with a propylene selectivity higher than 97%,far higher than Pt-Sn catalysts supported on other alumina supports.The structures of the catalysts are characterized by means of SEM,STEM,and CO-IR.Results show that Pt-Sn/r-Al_(2)O_(3) possesses the isolated and electron enriched Pt species,which promotes the activation of C—H and the desorption of propylene.

关 键 词：载体晶面诱导 丙烷脱氢 Pt-Sn合金 贵金属减量化 

分 类 号：O69[理学—化学]