关键词: 正丁烷, 氧化铬, 二氧化硅, 催化脱氢, 丁烯

Abstract: A series of CrOx/SiO2 catalyst samples with various CrOx loadings for catalytic dehydrogenation of n-butane were prepared by incipient wetness impregnation method. The catalyst samples were characterized by XRD, FT-IR and UV-Vis techniques. It was found that the chromium on the silica surface existed in the form of Cr(III) and Cr(VI) species. The test results showed that with a catalyst having a CrOx loading of 12%, under the optimum reaction conditions of a reaction temperature of 590 ℃, mole ratios of H2 to n-C4H10 of 1.5~2.5, and a WHSV between 1~2 h-1, relatively high n-butane conversion and n-butene selectivity could be obtained. The ratio of 2-butene to 1-butene in the product was mainly influenced by the reaction temperature, the CrOx loading, ratio of hydrogen to n-butane and the WHSV had no significant influence.

Key words: n-butane, chromium oxide, silicon dioxide, catalytic dehydrogenation, butene