New insight into the enhanced catalytic performance of ZnPt/HZSM-5 catalysts for direct dehydrogenation of propane to propylene

被引：75
作者：
Chen, Chong [1 ,2 ]
Sun, Minglei [1 ]
Hu, Zhongpan [1 ]
Ren, Jintao [1 ]
Zhang, Shoumin [2 ]
Yuan, Zhong-Yong [1 ,2 ]
机构：
[1] Nankai Univ, Natl Inst Adv Mat, Sch Mat Sci & Engn, Tianjin 300350, Peoples R China
[2] Nankai Univ, Key Lab Adv Energy Mat Chem, Minist Educ, Collaborat Innovat Ctr Chem Sci & Engn Tianjin,Co, Tianjin 300071, Peoples R China
来源：
CATALYSIS SCIENCE & TECHNOLOGY | 2019年 / 9卷 / 08期
基金：
中国国家自然科学基金;
关键词：
CONVERSION; METHANE; AROMATIZATION; HYDROGENATION; HYDROCARBONS; SELECTIVITY; STABILITY; STRATEGY; CLUSTERS; SUPPORTS;
D O I：
10.1039/c9cy00237e
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Catalysts comprising zinc and platinum supported on high-silica HZSM-5 (HZ) were prepared for catalyzing the direct dehydrogenation of propane to propylene (PDH). The catalysts were characterized by a series of techniques, including XRD, N-2 sorption, TEM, H-2-TPR, NH3-TPD, XPS and TGA. The optimal 10Zn0.1Pt/HZ catalyst (consisting of 1000 ppm Pt and 10 wt% Zn) shows a high propylene yield (about 46%) and extraordinary dehydrogenation stability over 65 h at 525 degrees C without any regeneration procedure or H-2 as auxiliary gas. It is revealed that this catalyst has two kinds of active centers which work corporately: (i) Lewis acidic sites created by framework Zn species and (ii) small-sized PtZn particles. In addition, the stable state of the active species and strong carbon resistance of 10Zn0.1Pt/HZ related to the interaction effect between Pt and Zn are confirmed, accounting for the admirable reaction stability of PDH. This catalyst contains much more Zn and less Pt than previously reported PtZn-based dehydrogenation catalysts, breaking the traditional understanding about Pt-Zn catalysts and opening a wide avenue for the design of stable dehydrogenation catalysts.
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页码：1979 / 1988
页数：10
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