Synthesis of metal silicides using polyhedral oligomeric silsesquioxane as a silicon source for semi-hydrogenation of phenylacetylene. Issue 7 (21st February 2022)

• Record Type: Journal Article
• Authors: Cheng, Ming; Zhang, Xu; Guo, Zhenbo; Zhou, Zhen; Wang, Zhiqiang; Zhang, Minghui
• Is Part Of: Inorganic chemistry frontiers. Volume 9:Issue 7(2022)
• Page Start: 1386
• Page End: 1394
• Publication Date: 2022-02-21
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1qi01586a
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : An efficient route for synthesizing metal silicides is proposed, and the as-synthesized catalysts show excellent performance. Abstract : Metal silicides as new typical intermetallic compounds have great potential in catalytic reactions. Here, an efficient route for synthesizing metal silicides (such as Pd2 Si, Ru x Si, Pt x Si and Ni2 Si) is proposed using polyhedral oligomeric silsesquioxane as a silicon source under a H2 atmosphere. TG, FT-IR, Raman and XPS characterization methods were performed to investigate the formation mechanism, which indicates that the Si–C bonds from phenyl-POSS decomposition benefit the formation of a silicide phase under a H2 atmosphere at a high temperature (1000 °C). Compared with Pd/SiO2, a Pd2 Si/SiO2 -HT catalyst with post-treatment showed 97% conversion and 86% selectivity towards styrene in the semi-hydrogenation of phenylacetylene. The DFT theory also demonstrated the moderate adsorption of styrene (−0.62 eV) and a high energy barrier for deep hydrogenation (−1.01 eV) on a Pd2 Si (111) surface compared to those on Pd (−0.73 eV), which can explain the high selectivity of styrene on Pd2 Si.