Enhanced propane dehydrogenation to propylene over zinc-promoted chromium catalysts

被引：16

作者：

Liu, Jie ^{[1
,2
,3
]}

Liu, Yong ^{[1
,2
]}

Ni, Youming ^{[1
,2
]}

Liu, Hongchao ^{[1
,2
]}

Zhu, Wenliang ^{[1
,2
]}

Liu, Zhongmin ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, Natl Engn Lab Methanol Olefins, Dalian 116023, Peoples R China

[2] Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

CATALYSIS SCIENCE & TECHNOLOGY | 2020年 / 10卷 / 06期

关键词：

OXIDATIVE DEHYDROGENATION; ISOBUTANOL SYNTHESIS; OXIDE; PERFORMANCE; SILICA; REDUCTION; STABILITY; INSIGHTS; BULK; SITE;

D O I：

10.1039/c9cy01921a

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：

Direct propane dehydrogenation (PDH) is an attractive technology for propylene production. We show here that propane conversion is significantly enhanced by the addition of ZnO to Cr2O3. Furthermore, its activity is strongly dependent on the Zn/Cr molar ratio and one with Zn/Cr = 0.3 gives the highest propane conversion and propylene selectivity among the studied ZnxCr catalysts (x denoting the molar ratio, 0-0.5). Characterization with X-ray diffraction, nitrogen physisorption, X-ray fluorescence spectroscopy, temperature-programmed reduction, temperature-programmed desorption, transmission electron microscopy, and X-ray photoelectron spectroscopy indicates that addition of zinc to Cr2O3 leads to formation of a spinel phase and reduction of the particle size, and hence forms more defect sites. The Arrhenius plots suggest that the apparent activation energy of the PDH reaction is significantly lowered over Zn0.3Cr.

引用

页码：1739 / 1746

页数：8

共 39 条

[11] Investigating the CrOx/Al2O3 dehydrogenation catalyst model: I. identification and stability evaluation of the Cr species on the fresh and equilibrated catalysts [J].