脱氢
丙烷
丙烯
催化作用
氧化磷酸化
活动站点
鉴定(生物学)
化学
无机化学
有机化学
生物化学
植物
生物
作者
Xiaofeng Gao,Wenhao Xu,Xing Li,Jiajie Cen,Yangzhi Xu,Lili Lin,Siyu Yao
标识
DOI:10.1016/j.cej.2022.136393
摘要
• Synthesis methods effectively control the interaction of Pt and Sn in Pt-Sn/Al 2 O 3 . • Pt-Sn chloride complexes promotes the formation of PtSn alloy. • Sequential impregnation method induces Sn modification to Pt NPs. • Pt partially modified with reduced Sn is more active and stable for PDH reaction. Supported platinum-tin over various oxide supports have been widely recognized as the efficient propane dehydrogenation catalysts due to their excellent activity, C 3 H 6 selectivity and stability after oxidative regeneration. The nature of the active species of the Pt-Sn catalysts is still under debate. Here, by controlling the formation of Pt-Sn chloride complexes during the impregnation stage, we managed to tune spatial distribution of Pt and Sn species over Al 2 O 3 and further influence the degree of alloying between reduced Pt and Sn. The structure characterization revealed the co-impregnation method tend to generate PtSn alloy active site, while sequential impregnation of Pt on pre-synthesized Sn/Al 2 O 3 tend to form Sn partially modification of Pt. Performance evaluation demonstrated that the Pt clusters partially modified by reduced Sn exhibited much higher activity and longer life-time than PtSn alloy counterparts under similar C 3 H 6 selectivity. With further optimization, the Pt-Sn/Al 2 O 3 prepared by sequential impregnation method achieved over 64.1 μmol/g cat /h propylene formation rate at the 30% propane conversion with the C 3 H 6 selectivity exceeding 99%.
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