IrSn双金属催化剂催化丙烷脱氢机理研究  

Mechanism of IrSn bimetallic catalyst in catalyzing propane dehydrogenation

作　　者：王明山 马瑞 周博 解晓伟 WANG Ming-shan;MA Rui;ZHOU Bo;XIE Xiao-wei(School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China;Guangdong Provincial Laboratory of Chemistry and Fine Chemical Industry,Shantou 515000,China)

机构地区：[1]广东工业大学轻工化工学院,广东广州510006 [2]化学与精细化工广东省实验室,广东汕头515000

出　　处：《现代化工》2024年第2期131-136,共6页Modern Chemical Industry

基　　金：国家自然科学基金项目(22172037,22102060);广东省自然科学基金面上项目(2023A1515010971);化学与精细化工广东省实验室青年人才引进项目(1911023,2111001)。

摘　　要：为解决传统PtSn催化剂在丙烷脱氢(PDH)中结构不稳定导致的失活问题,通过原位转变法设计了一种表面富集SnO_(x)的高效丙烷脱氢催化剂Ir@SnO_(x)-S。结果表明,与浸渍法制备的IrSn-S相比,Ir@SnO_(x)-S催化剂丙烷转化率增加52.8%,同时表现出97%的丙烯选择性,在连续的循环测试中保持了高度稳定的催化性能。通过XRD、XPS、TEM和原位红外等表征手段对2种催化剂进行结构分析发现,在Ir@SnO_(x)-S催化剂表面生成了SnO_(x)富集层,该物种与Ir之间产生强烈的电子交互作用,诱导生成高活性的表面Irδ+物种,进而提升了丙烷活化的转化频率。In order to solve the deactivation problem of traditional PtSn catalysts caused by the unstable structure during propane dehydrogenation(PDH),Ir@SnO_(x)-S,an efficient catalyst with a surface covered by SnO_(x),is designed via in-situ transition method.Compared with IrSn-S catalyst prepared via impregnation method,the prepared Ir@SnO_(x)-S catalyst can increase the conversion rate of propane by 52.8%and deliver a 97%of propylene selectivity,while maintaining a highly stable catalytic performance in continuous cycle tests.The structures of these two catalysts are analyzed by means of XRD,XPS,TEM and in-situ infrared.It is indicated that the SnO_(x) species enriched layer is formed on the surface of Ir@SnO_(x)-S.Strong electronic interaction takes place between SnO_(x) species and Ir,which induces the formation of highly active surface Irδ+species for Ir@SnO_(x)-S catalyst,further increasing the conversion frequency of propane activation.

关 键 词：丙烷脱氢 双金属催化剂 合成 稳定性 构效关系 

分 类 号：TQ423.93[化学工程]