Catalyst for selective hydrogenation, its preparation process and application
AssigneesChina Petroleum & Chemical Corporation, Beijing Research Institute of Chemical Industry, China Petroleum & Chemical Corporation
InventorsQianwen Zhang, Han Zhang
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Abstract
The present invention relates to a catalyst for selective hydrogenation of alkynes and dienes, its preparation process and application. The catalyst has an inorganic oxide support, a major active component palladium, and a Group IB metal promoter. The active components are uniformly distributed in the catalyst body within the thickness between the support surface and the depth of more than 300 μm. The catalyst of the present invention has high activity, high selectivity, ability to resist sulfur and arsenic poisoning. The catalyst is particularly applicable to C2-C3 fraction with any concentrations of hydrogen and CO.
Claims18
A selective hydrogenation catalyst comprising:
- an inorganic oxide support selected from alumina, titania, and a chemical composite of alumina and titania;
- a major active component Pd of a content of about 0.002-1.0% based on the total weight of the catalyst;
- and
- at least one promoter selected from Group IB metals, the mole ratio of palladium to the Group IB metal being in the range of about 1 to about 20;
- wherein the major component palladium and the promoter are uniformly distributed together in the catalyst body within the thickness between the support surface and the depth of more than about 300 μm.
A process for preparing the chemical composite support of alumina and titania, comprising the following steps:
- dissolving MAlO2 and titanium salt solutions in water at about 20-80° C;
- neutralizing the mixture with a MOH solution to neutrality to form a co-precipitate of aluminum-titanium hydroxide, which is stirred for about 10-30 h to form uniform crystal particles;
- filtering the resultant to wash away the M+ and acid radical negative ions with deionized water;
- drying the derived aluminium-titanium hydroxide at about 100-150° C;
- after pulverizing, forming a solid sample by kneading;
- and
- calcining the solid sample at about 800-1100° C. to obtain the chemical composite support of alumina-titania, wherein the M is Na, K, or Li.
Dependencies are inferred from the claim text.