Stable and selective catalysts for propane dehydrogenation operating at thermodynamic limit

doi:10.1126/science.abg7894

GSTDTAP > 气候变化

DOI	10.1126/science.abg7894
	Stable and selective catalysts for propane dehydrogenation operating at thermodynamic limit
	Ali Hussain Motagamwala; Rawan Almallahi; James Wortman; Valentina Omoze Igenegbai; Suljo Linic
	2021-07-09
发表期刊	Science
出版年	2021
英文摘要	The greater abundance of propane from shale gas has spurred efforts to use it as a propylene feedstock. Direct dehydrogenation catalysts consisting of platinum–tin alloy nanoparticles supported on alumina often must run with hydrogen dilution to avoid carbon buildup and excess tin to avoid alloy segregation. Motagamwala et al. report that platinum–tin nanoparticles interact more weakly with a silica support and the metals thus do not segregate. The use of undiluted reactants allowed the reaction to run near the thermodynamically limit of about 67% conversion with a selectivity to propylene of more than 99%. This catalyst also does not build up carbon and could run up to 30 hours without deactivation. Science , abg7894, this issue p. [217][1] Intentional (“on-purpose”) propylene production through nonoxidative propane dehydrogenation (PDH) holds great promise for meeting the increasing global demand for propylene. For stable performance, traditional alumina-supported platinum-based catalysts require excess tin and feed dilution with hydrogen; however, this reduces per-pass propylene conversion and thus lowers catalyst productivity. We report that silica-supported platinum-tin (Pt1Sn1) nanoparticles (<2 nanometers in diameter) can operate as a PDH catalyst at thermodynamically limited conversion levels, with excellent stability and selectivity to propylene (>99%). Atomic mixing of Pt and Sn in the precursor is preserved upon reduction and during catalytic operation. The benign interaction of these nanoparticles with the silicon dioxide support does not lead to Pt-Sn segregation and formation of a tin oxide phase that can occur over traditional catalyst supports. [1]: /lookup/doi/10.1126/science.abg7894
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/334277
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Ali Hussain Motagamwala,Rawan Almallahi,James Wortman,et al. Stable and selective catalysts for propane dehydrogenation operating at thermodynamic limit[J]. Science,2021.
APA	Ali Hussain Motagamwala,Rawan Almallahi,James Wortman,Valentina Omoze Igenegbai,&Suljo Linic.(2021).Stable and selective catalysts for propane dehydrogenation operating at thermodynamic limit.Science.
MLA	Ali Hussain Motagamwala,et al."Stable and selective catalysts for propane dehydrogenation operating at thermodynamic limit".Science (2021).