High-performance Cr-Zr-O and Cr-Zr-K-O catalysts prepared by nanocasting for dehydrogenation of propane to propene

被引：31

作者：

Wegrzyniak, A. ^{[1
]}

Rokicinska, A. ^{[2
]}

Hedrzak, E. ^{[1
]}

Michorczyk, B. ^{[1
]}

Zenczak-Tomera, K. ^{[1
]}

Kustrowski, P. ^{[2
]}

Michorczyk, P. ^{[1
]}

机构：

[1] Cracow Univ Technol, Inst Organ Chem & Technol, Warszawska 24, PL-31155 Krakow, Poland

[2] Jagiellonian Univ, Fac Chem, Gronostajowa 2, PL-30387 Krakow, Poland

来源：

CATALYSIS SCIENCE & TECHNOLOGY | 2017年 / 7卷 / 04期

关键词：

MESOPOROUS METAL-OXIDES; CHROMIA-ZIRCONIA CATALYSTS; HIGH-SURFACE-AREA; GALLIUM OXIDE; CHROMIA/ZIRCONIA CATALYSTS; ISOBUTANE DEHYDROGENATION; MECHANICAL STABILITY; INORGANIC OXIDES; MOLECULAR-SIEVES; I-BUTANE;

D O I：

10.1039/c7cy01744h

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：

Ordered mesoporous Cr-Zr-O and Cr-Zr-K-O catalysts were prepared by nanocasting using a CMK-3 carbon replica as a hard template. The synthesized oxide nanoreplicas had a uniform pore-size distribution centered in the range of 5.5-6.5 nm and specific surface areas of 123-164 m(2) g(-1). Results of physicochemical characterization (UV-vis DRS, EPR, XRD, XPS and H-2-TPR) revealed that chromium species were stabilized in +3, +5 and +6 oxidation states in all samples. The developed materials exhibited excellent catalytic performance and much higher resistance to deactivation during the process of dehydrogenation of propane to propene in comparison with a material prepared without the CMK-3 hard template assistance. Potassium doping (0.2, 0.5 or 1.0 wt%) of the catalyst with a Zr/Cr atomic ratio of 5 enhanced the selectivity to propene and resistance to coke deposition.

引用

页码：6059 / 6068

页数：10

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