Hydrogenation catalysts and the preparation processes thereof
AssigneesChina Petroleum & Chemical Corporation, Fushun Research Institute of Petroleum
InventorsYanxia Zhang, Shenghua Yuan, Peng Gao, Hao Zhang, Qiuhong Fu, Ri Duan
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Abstract
The present disclosure provides a hydrogenation catalyst, the preparation process thereof and the application thereof in the production of 1,4-butanediol by hydrogenating dialkyl maleate and/or dialkyl succinate. The catalyst comprises Cu—Al-A-B—O, wherein A comprises at least one of Zn, Mo and W, B comprises at least one of Ba, Mn, Mg, Ti, Ce and Zr. In the process for preparing said hydrogenation catalyst, a part of Cu and A are precipitated first and the rest of Cu, Al and B are precipitated successively.
Claims25
A hydrogenation catalyst comprising Cu—Al-A-B—O, wherein A comprises at least one of Zn, Mo and W, and B comprises at least one of Ba, Mn, Mg, Ti, Ce and Zr;
- further wherein;
- the amount of copper oxide ranges from about 30% to about 70% by weight relative to the total weight of the catalyst,
- the amount of aluminum oxide ranges from about 10% to about 40% by weight relative to the total weight of the catalyst,
- the content of A calculated as oxide ranges from about 20% to about 50% by weight relative to the total weight of the catalyst,
- the content of B calculated as oxide ranges from about 5% to about 15% by weight relative to the total weight of the catalyst, and
- the acid distribution measured by ammonia adsorption-TPD method comprises:
- the amount of acid sites at the temperature of 150˜250° C. ranges from about 0.025 mmol/g to about 0.070 mmol/g, the amount of acid sites at the temperature of 250˜400° C. ranges from about 0.020 mmol/g to about 0.065 mmol/g, the amount of acid sites at the temperature of 400˜500° C. ranges from about 0.005 mmol/g to about 0.020 mmol/g.
A process for preparing a hydrogenation catalyst comprising:
- (1) preparing a first mixed solution comprising soluble salts of Cu and A, wherein A comprises at least one of Zn, Mo and W;
- dropwise adding simultaneously the first mixed solution and a precipitator I under stirring to form a precipitation system, and controlling the pH value of the precipitation system to be ranging from about 4.0 to about 6.5, wherein the temperature of the precipitation system ranges from about 15° C. to about 40° C.;
- wherein the amount of Cu used in step (1) ranges from about 45 wt % to about 55 wt % of the total used amount of Cu, and the rest of Cu is introduced m step (2);
- (2) preparing a second mixed solution comprising Cu, Al and B, wherein B comprises at least one of Ba, Mn, Mg, Ti, Ce and Zr;
- dropwise adding simultaneously the second mixed solution and a precipitator II to the precipitation system obtained in step (1) under stirring, increasing the temperature of the precipitation system to range from about 45° C. to about 80° C., and controlling the pH value of the precipitation system range from about 5.5 to about 8.5;
- (3) drying the precipitation system obtained in step (2) at a drying temperature ranging from about 100° C. to about 200° C., and then calcining for a period of time ranging from about 2 hours to about 8 hours at a temperature ranging from about 500° C. to about 900° C. to obtain the hydrogenation catalyst.
Dependencies are inferred from the claim text.