Selective oxidation of propane to oxygenates over mesoporous SBA-15-supported potassium catalysts
As a novel catalyst system for the selective oxidation of low alkanes, mesoporous SBA-15-supported potassium catalysts were firstly employed for the selective oxidation of propane to oxygenates by using molecular oxygen as oxidant. It was found, compared with bare mesoporous SBA-15, that the selectivities to the oxygenates including formaldehyde, acetaldehyde, acrolein and acetone were remarkably enhanced over K x /SBA-15(K:Si = x:100, mol) catalysts, and the main products were acrolein and acetone. At 500 °C, the yield of the oxygenates can reach 464% over K3.0/SBA-15, which is the highest value over SBA-15–supported potassium catalysts. The catalysts were characterized by XRD and BET techniques. The results demonstrated that the catalytic performance was strongly dependent on the potassium content of the catalysts. Furthermore, the highly dispersed potassium on the catalyst surface was shown to be important to orientate the reaction toward the production of oxygenates. The obtained results showed that mesoporous structure, uniform pore sizes and appropriate pore surface area were favorable for the selective oxidation of propane. The samples with moderate amount of potassium promoted the selectivity to the oxygenates.
KeywordsSelective oxidation Propane Highly dispersed Oxygenates Catalyst Physico-chemical characters
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We acknowledge financial support of the National Science Foundation of China (Grant No. 20373043), the Scientific Research Key Foundation for the Returned Overseas Chinese Scholars of Ministry of Education and the National Basic Research Program of China (No. 2004CB217806 and 2005CB221402).
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