Mo containing catalyst, a preparation method and a method for preparing methyl mercaptan
A method is described to prepare a Mo containing supported catalyst comprising TeO 2 as active promoter and a process for preparing methanethiol in the presence of said catalyst.
1. A supported catalyst for the preparation of methanethiol comprising
a) a Mo and a K compound as active components, whereby Mo and K can be constituents of the same compound,
b) a promoter, wherein the promoter comprises TeO 2 and
c) an oxidic carrier
wherein the weight ratios of the components are
TeO 2 /K 2 MoO 4 /carrier=(1-20)/(1-50)/100 or
TeO 2 /MoO 3 /K 2 O/carrier=(1-20)/(1-50)/(1-50)/100.
2. The catalyst according to claim 1 , wherein the weight ratios of the components are
(1) TeO 2 /K 2 MoO 4 /carrier=(3-12)/(15-30)/100 or
(2) TeO 2 /MoO 3 /K 2 O/carrier=(3-12)/(15-30)/(8-20)/100.
3. The catalyst according to claim 1 , wherein the carrier is selected from the group consisting of SiO 2 , Al 2 O 3 , TiO 2 , Al 2 O 3 —SiO 2 , ZrO 2 , zeolites, pure or mixtures of said metal oxides.
4. The catalyst according to claim 1 , wherein the catalyst contains an active Mo—O—K center.
5. The catalyst according to claim 1 , wherein the catalyst is sulfided by exposing to an hydrogen sulphide containing atmosphere.
6. The catalyst according to claim 1 , wherein the TeO 2 content is in the range from 1 to 20 wt % of the catalyst.