Sb. Wang et al., Oxidative dehydrogenation of ethane by carbon dioxide over sulfate-modified Cr2O3/SiO2 catalysts, CATAL LETT, 63(1-2), 1999, pp. 59-64
The oxidative dehydrogenation of ethane into ethylene by carbon dioxide ove
r unsupported Cr2O3, Cr2O3/SiO2 and a series of Cr2O3/SiO2 catalysts modifi
ed by sulfate was investigated. The results show that Cr2O3/SiO2 is an effe
ctive catalyst for dehydrogenation of ethane and CO2 in the feed promotes t
he catalytic activity. Sulfation of silica will influence the catalytic beh
avior of Cr2O3/SiO2 in dehydrogenation of ethane with carbon dioxide depend
ing on the amount of sulfate. Cr2O3/6 wt% SO42--SiO2 catalysts exhibit an e
xcellent performance for this reaction, giving an ethylene yield of 55% at
67% ethane conversion at 650(degrees)C. Characterizations indicate that add
ition of sulfate changes the bulk and surface properties of Cr2O3/SiO2, pro
moting the reduction of Cr6+ to Cr3+ and favoring the catalytic conversion.