Catalyst for methanol production, method of producing the same and process of methanol production
[Problem] The present invention is to provide a catalyst used for a process for preparing methanol from carbon dioxide and hydrogen and the catalyst has high activity and excellent stability with the passage of time in reactivity. [Solution] The catalyst comprises copper, zinc, aluminum and silicon, and has a molar ratio of zinc to copper of 0.5 to 0.7, a molar ratio of silicon to copper of 0.015 to 0.05, a maximum intensity ratio of a peak derived from zinc to a peak derived from copper of not more than 0.25 and a half-value width (2θ) of the peak derived from copper of 0.75 to 2.5. The process for producing methanol comprises using the catalyst.
1. A catalyst for methanol production using carbon oxides as a raw material, which comprises copper, zinc, aluminum and silicon and has the following properties:
(A) the molar ratio of zinc to copper is 0.5 to 0.7,
(B) the molar ratio of silicon to copper is 0.015 to 0.05,
(C) the catalyst comprises CuO and ZnO, and the maximum intensity ratio of a peak derived from the ZnO to a peak derived from the CuO, as measured by XRD, is not more than 0.25 and
(D) the half-value width (2θ) of a peak derived from the CuO, as measured by XRD, is 0.75 to 2.5.
2. The catalyst for methanol production according to claim 1 wherein the catalyst has a property that (E) the content of zirconium is 0 to 0.1 mol %.
3. The catalyst for methanol production according to claim 1 wherein the content of copper is 45 to 65 mol % provided that the total amount of copper, zinc, aluminum and silicon is 100 mol %.
4. The catalyst for methanol production according to claim 1 wherein the content of an alkali metal is 0 to 0.2 mol %.
5. The catalyst for methanol production according to claim 1 which is obtainable through a step of calcination at a temperature of 300° C. to 450° C.
6. A method for producing the catalyst for methanol production of claim 1 , comprising a step of calcination of a catalyst precursor comprising copper, zinc, aluminum and silicon, and having (A) a molar ratio of zinc to copper being 0.5 to 0.7, and (B) a molar ratio of silicon to copper being 0.015 to 0.05, at a temperature of 300° C. to 450° C.
7. A process for producing methanol in the presence of the catalyst for methanol production as claimed in claim 1 , carbon oxides and hydrogen.
8. A catalyst for methanol production using carbon oxides as a raw material, which comprises copper, zinc, aluminum and silicon and has the following properties:
(A) the molar ratio of zinc to copper is 0.5 to 0.7,
(B) the molar ratio of silicon to copper is 0.015 to 0.05,
(C) the maximum intensity ratio of a peak derived from zinc to a peak derived from copper, as measured by XRD, is not more than 0.25 and
(D) a powder X-ray diffraction pattern derived from copper comprises a peak at about 39° and the half-value width (2θ) of the peak is 0.75 to 2.5.
9. The catalyst for methanol production according to claim 8 wherein the catalyst has a property that (E) the content of zirconium is 0 to 0.1 mol %.
10. The catalyst for methanol production according to claim 8 wherein the content of copper is 45 to 65 mol % provided that the total amount of copper, zinc, aluminum and silicon is 100 mol %.
11. The catalyst for methanol production according to claim 8 wherein the content of an alkali metal is 0 to 0.2 mol %.
12. The catalyst for methanol production according to claim 8 which is obtainable through a step of calcination at a temperature of 300° C. to 450° C.
13. A method for producing the catalyst of claim 8 , comprising a step of calcination of a catalyst precursor comprising copper, zinc, aluminum and silicon, and having (A) a molar ratio of zinc to copper being 0.5 to 0.7, and (B) a molar ratio of silicon to copper being 0.015 to 0.05, at a temperature of 300° C. to 450° C.
14. A process for producing methanol in the presence of the catalyst of claim 8 , carbon oxides and hydrogen.