Chromium oxide supported on MCM-41 as a highly active and selective catalyst for dehydrogenation of propane with CO2

作者：Michorczyk Piotr^*; Ogonowski Jan; Kustrowski Piotr; Chmielarz Lucjan

来源：Applied Catalysis A: General , 2008, 349(1-2): 62-69.

DOI：10.1016/j.apcata.2008.07.008

• Dehydrogenation
• CO2
• Propene
• Chromium oxide catalysts
• MCM-41
• TPSR of CO2 with Hz

incipient wetness technique was used for a preparation of MCM-supported chromium oxide materials with a Cr loading ranging from 0.7 to 13.7 wt%. The obtained samples were characterized by XRD, UV-vis-DRS, H-2-TPR and BET, and tested as catalysts in dehydrogenation of propane with CO2. The catalytic reaction was studied in a flow apparatus at 773-923 K. All the tested catalysts exhibited a good catalytic performance in the dehydrogenation of propane with CO2. The best results were achieved over the sample containing 6.8 wt% of Cr. In this case, the selectivity to propene was above 80%, while the conversion of propane increased from 21% (at 773 K) to 62% (at 923 K). The promoting effect of CO2 on the yield of propene was found for all the studied catalysts. This effect was discussed on the basis of temperature-programmed reaction of CO2 with H-2 as well as H-2-TPR experiments after regeneration of the reduced catalyst with pure CO2. It was suggested that one of reasons of a higher yield of propene observed in the presence of CO2 compared to that measured in the absence of CO2 Was coupling of the dehydrogenation of propane with the reverse water-gas shift reaction.

• 出版日期2008-10-31