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
刘雅楠 1郑天赐 2宋远飞 2翁少霞 2李殿卿1
作者信息
- 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;衢州资源化工创新研究院,浙江衢州 324000
- 2. 北京化工大学化工资源有效利用国家重点实验室,北京 100029
- 折叠
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Al2O3 择优暴露晶面诱导效应构筑稳定的Pt-Sn/Al2O3 有序合金催化剂.通过丙烷脱氢性能评价发现,棒状r-Al2O3 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-Al2O3 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.
Abstract
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/Al2O3 ordered alloy catalyst is constructed by means of the induced effect of preferential exposed facets of Al2O3.Through the catalytic performance evaluation in propane dehydrogenation,it is found that rod-shaped Al2O3 supported Pt-Sn catalyst forms a uniform and structurally stable ordered alloy structure.At 560℃,initial conversion of propane over Pt-Sn/Al2O3 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-Al2O3 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Key words
support crystal plane induction/propane dehydrogenation/Pt-Sn alloy/reduced use of precious metals引用本文复制引用
基金项目
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)
出版年
2024
NETL
NSTL
万方数据