Oxidative conversion of hydrocarbons using sulfur oxides as oxygen carriers
The oxidative coupling of methane (OCM) and the oxidative dehydrogenation (ODH) of ethane and higher hydrocarbons is described using SO 3 and sulfate, sulfite, bisulfite and metabifulfite salts as oxygen transfer agents in the presence of one or more elements selected from Groups 3 to 14 of the periodic table, optionally further in the presence of alkali or alkaline salts and/or sulfur-containing compounds.
1. A composition comprising:
(a) 10 to 90 wt % CaSO 4 ;
(b) 1 to 85 wt % of a total of W and at least one of Fe and/or Mn; and
(c) 1 to 10 wt % of an alkali metal salt,
wherein the composition is capable of oxidative dehydrogenation of a saturated hydrocarbon feed and of OCM.
2. The composition according to claim 1 ,
wherein (b) is W and Fe.
3. The composition according to claim 1 ,
wherein (b) is W and Mn.
4. The composition according to claim 1 ,
wherein (b) is W, Fe and Mn.
5. The composition according to claim 1 ,
wherein
(b) is W and Fe, and
(c) is an alkali metal halide.
6. The composition according to claim 1 ,
wherein
(b) is W and Fe, and
(c) is an alkali metal hydroxide.
7. The composition according to claim 1 , wherein
(b) is W and Mn, and
(c) is an alkali metal halide.
8. The composition according to claim 1 , wherein
fb) is W and Mn, and
(c) is an alkali metal hydroxide.
9. The composition according to claim 1 , wherein
fb) is W, Fe and Mn, and
fc) is an alkali metal halide.
10. The composition according to claim 1 , wherein
(b) is W, Fe and Mn, and
(c) is an alkali metal hydroxide.
11. The composition according to claim 1 , wherein the composition is in contact with a saturated hydrocarbon feed gas containing 1 to 100,000 ppm of a sulfur containing compound selected from the group consisting of H 2 S, SO 2 or SO 3 .