Coupling dehydrogenation of isobutane to isobutene in the presence of carbon dioxide over NiO/Al2O3 catalyst

✍ Scribed by Jian-fei DING; Zhang-feng QIN; Shu-wei CHEN; Xue-kuan LI; Guo-fu WANG; Jian-guo WANG

• Publisher: Elsevier
• Year: 2010
• Tongue: Chinese
• Weight: 146 KB
• Volume: 38
• Category: Article
• ISSN: 1872-5813
• DOI: 10.1016/s1872-5813(10)60040-0

✦ Synopsis

Dehydrogenation of isobutane to isobutene in the presence of carbon dioxide was carried out over NiO/Al 2 O 3 catalyst and the effect of K 2 O additive on its catalytic behavior was investigated. Compared with the reaction in an inert atmosphere, the dehydrogenation of isobutane is coupled with the reverse water-gas shift by conducting the reaction in carbon dioxide, which can then enhance the isobutene yield. The addition of K 2 O in the NiO/Al 2 O 3 catalyst can decrease its acidity, alleviate the deep reduction of NiO active species during the reaction and then suppress the side reactions like cracking and coke formation; these are helpful to enhance the isobutene yield and to improve the catalyst stability.