The oxidation of ethane in the presence and absence of tetrachloromethane on calcium hydroxyapatites with incorporated lead

✍ Scribed by Shigeru Sugiyama; Keiichi Abe; Takashi Miyamoto; Hiromu Hayashi; John B Moffat

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 925 KB
• Volume: 130
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/s1381-1169(97)00221-5

✦ Synopsis

The oxidative dehydrogenation of ethane has been investigated on various lead-added calcium hydroxyapatites and the Ž . effect of the addition of tetrachloromethane TCM into the feedstream has been examined. The catalysts are stable up to 873 K but are converted to the corresponding phosphates at approximately 973 K. The conversions of ethane and the selectivities to C and C compounds were found to be dependent on the lead contents of the catalysts, both the pretreatment and 1 2 reaction temperatures, the presence of TCM and the times-on-stream as well as the structural forms of the catalysts. In the absence of TCM the conversion of ethane and the various selectivities show a dependence on the lead content of the catalysts which is similar at 773 and 873 K, but dissimilar at 973 K due, at least in part to the formation of the phosphates at the latter temperature. With TCM in the process feedstream the influence of the chlorapatites which are formed overrides that of the added lead. q 1998 Elsevier Science B.V.