Catalyst for hydrolysis of carbonyl sulfide and method of producing same
A catalyst for COS hydrolysis includes titanium dioxide and a barium compound supported on the titanium dioxide. The catalyst, when expressing Ba and S in the catalyst in terms of BaO and SO 3 , respectively, has a molar ratio of SO 3 to BaO of at least 1. The catalyst converts COS and H 2 O in a raw material gas to CO 2 and H 2 S.
1. A catalyst for COS hydrolysis comprising:
a titanium dioxide carrier;
a barium compound supported on the titanium dioxide carrier; and
sulfate ions supported on the titanium dioxide carrier;
wherein, a Ba content and a S content in the catalyst are expressed in terms of BaO and SO 3 , respectively, and a molar ratio of SO 3 to BaO in compounds supported on the titanium dioxide carrier of the catalyst is at least 2.1, and
wherein the catalyst converts COS and H 2 O in a raw material gas to CO 2 and H 2 S.
2. The catalyst for COS hydrolysis according to claim 1 , wherein the barium compound is supported on the titanium dioxide carrier in an amount of 2% by mass or greater and 8% by mass or less in terms of the barium oxide with respect to the catalyst.
3. A method of producing a catalyst for converting COS and H 2 O in a raw material gas to CO 2 and H 2 S by COS hydrolysis, comprising:
adding a barium acetate solution to titanium dioxide containing a sulfate ion and performing kneading to obtain a kneaded product;
extruding the kneaded product to obtain a molded catalyst;
drying the molded catalyst; and
calcining subsequent to the drying to obtain a catalyst of a titanium dioxide carrier supporting a barium compound and a sulfate ion,
wherein, a Ba content and a S content in the catalyst are expressed in terms of BaO and SO 3 , respectively, and a molar ratio of SO 3 to BaO in compounds supported on the titanium dioxide carrier of the catalyst is at least 2.1.
4. The method according to claim 3 , wherein in the kneading to obtain the kneaded product, the barium acetate solution is added in an amount of 2% by mass or more and 8% by mass or less in terms of the barium oxide with respect to the catalyst.