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High-performance Cr–Zr–O and Cr–Zr–K–O catalysts prepared by nanocasting for dehydrogenation of propane to propene
Catalysis Science & Technology ( IF 5 ) Pub Date : 2017-11-08 00:00:00 , DOI: 10.1039/c7cy01744h
A. Węgrzyniak 1, 2, 3, 4 , A. Rokicińska 4, 5, 6, 7 , E. Hędrzak 1, 2, 3, 4 , B. Michorczyk 1, 2, 3, 4 , K. Zeńczak-Tomera 1, 2, 3, 4 , P. Kuśtrowski 4, 5, 6, 7 , P. Michorczyk 1, 2, 3, 4
Affiliation  

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 m2 g−1. Results of physicochemical characterization (UV-vis DRS, EPR, XRD, XPS and H2-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.

中文翻译:

纳米铸造制备的用于丙烷脱氢为丙烯的高性能Cr-Zr-O和Cr-Zr-K-O催化剂

有序介孔的Cr-Zr-O和Cr-Zr-K-O催化剂是通过使用CMK-3碳复制品作为硬模板的纳米铸造法制备的。合成的氧化物纳米复制体具有均匀的孔径分布,中心分布在5.5-6.5 nm范围内,比表面积为123-164 m 2 g -1。物理化学表征的结果(UV-vis DRS,EPR,XRD,XPS和H 2-TPR)表明,所有样品中的铬物种均稳定在+ 3,+ 5和+6氧化态。与不使用CMK-3硬模板助剂制备的材料相比,开发的材料在丙烷脱氢为丙烯的过程中表现出出色的催化性能和更高的抗失活性。Zr / Cr原子比为5的催化剂的钾掺杂(0.2、0.5或1.0 wt%)提高了对丙烯的选择性和对焦炭沉积的抵抗力。
更新日期:2017-11-22
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