Boosting selectivity and stability on Pt/BN catalysts for propane dehydrogenation via calcination & reduction-mediated strong metal-support interaction  

作　　者：Yaoxin Wang Jiandian Wang Ping Zheng Changyong Sun Junyin Luo Xiaowei Xie 

机构地区：[1]Key Laboratory of Clean Chemical Technology of Guangdong Regular Higher Education Institutions,School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,Guangdong,China

出　　处：《Journal of Energy Chemistry》2022年第4期451-457,共7页能源化学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(21273049,22172037);the Guangdong Basic and Applied Basic Research Foundation(2021A1515010014);the Science and Technology Program of Guangzhou(201904010023);the CAS Key Laboratory of Renewable Energy(E029kf0901)。

摘　　要：Propane dehydrogenation(PDH) provides an alternative route for producing propylene. Herein, we demonstrates that h-BN is a promising support of Pt-based catalysts for PDH. The Pt catalysts supported on h-BN were prepared by an impregnation method using Pt(NH_(3))_(4)(NO_(3))_(2) as metal precursors. It has been found that the Pt/BN catalyst undergoing calcination and reduction is highly stable in both PDH reaction and coke-burning regeneration, together with low coke deposition and outstanding propylene selectivity(99%). Detailed characterizations reveal that the high coke resistance and high propylene selectivity of the Pt/BN catalyst are derived not only from the absence of acidity on BN support, but also from the calcination-induced and reduction-adjusted strong metal-support interaction(SMSI) between Pt and BN, which causes the partial encapsulation of Pt particles by BO_(x) overlayers. The BO_(x) overlayers can block the low-coordinated Pt sites and constrain Pt particles into smaller ensembles, suppressing side reactions such as cracking and deep dehydrogenation. Moreover, the BO_(x) overlayers can effectively inhibit Pt sintering by the spatial isolation of Pt during periodic reaction-regeneration cycles. In this work, the catalyst support for PDH is expanded to nonoxide BN, and the understanding of SMSI between Pt and BN will provide rational design strategy for BN-based catalysts.

关 键 词：Pt catalyst BN SMSI Propane dehydrogenation SELECTIVITY STABILITY COKE Sintering 

分 类 号：TQ221.212[化学工程—有机化工] TQ426