Nickel-molybdenum hydrogenation catalyst and method for preparing same

Abstract

The invention relates to a nickel-molybdenum catalyst and a method for preparing the same, in particular to a method for preparing a nickel-molybdenum hydrogenation catalyst. Nickel-containing aluminum oxide is used as a carrier for the nickel-molybdenum hydrogenation catalyst. The nickel-molybdenum hydrogenation catalyst contains nickel and molybdenum which are active components, the nickel-containing aluminum oxide is used as the carrier, nickel-containing pseudo-boehmite is used as a precursor for the nickel-containing aluminum oxide carrier, and procedures for preparing the nickel-containing pseudo-boehmite include acid-base neutralization and gelatinizing procedures. The method has the advantages that the specific carrier is used in the nickel-molybdenum hydrogenation catalyst, accordingly, the nickel and pseudo-boehmite can be organically bound with each other, the active component nickel can be effectively dispersed in the pseudo-boehmite, and the nickel-containing aluminum oxide carrier in specific crystal forms can be formed; good effects of regulating pore structures and the acidity of the carrier can be realized, procedures are simple as compared with catalysts simply prepared by the aid of impregnation processes, and the performance of carrier materials is easy to modulate; the nickel-molybdenum hydrogenation catalyst prepared by the aid of the method is high in hydrogenation activity and selectivity and good in chemical stability and thermal stability, and the like.

Description

technical field [0001] The invention relates to a nickel-molybdenum series catalyst and a preparation method thereof, in particular to a preparation method of a nickel-molybdenum series hydrogenation catalyst with nickel-containing alumina as a carrier. Background technique [0002] Many countries regard the output of ethylene as a symbol of the development level of the country's petrochemical industry. With the rapid development of my country's economy, ethylene production is increasing year by year. As an important by-product of ethylene cracking, pyrolysis gasoline accounts for about 50% to 80% of the ethylene production capacity. How to make good use of this part of by-products will have a major impact on improving the economic benefits of enterprises. At the same time, pyrolysis gasoline also contains a large amount of unsaturated hydrocarbons such as diolefins, alkenyl aromatics, indene, and impurities such as sulfur, nitrogen, and oxygen, which lead to unstable gaso...

AI Technical Summary

Problems solved by technology

[0005] CN1218822A has reported a kind of Ni / Al 2 o 3 A selective hydrogenation catalyst suitable for pyrolysis gasoline fractions. The catalyst is prepared by loading nickel on an alumina carrier containing lithium or alkaline earth metals. This catalyst is not good in hydrogenation load and hydrogenation stability.

Therefore, there are the following problems in the impregnation process: (1) due to the constant water absorption of the carrier, the volume of the impregnating solution using the equal volume impregnation method is constant, and the high addition of active metal components will cause incomplete dissolution; (2) the preparation of the catalyst process It is necessary to impregnate the active component multiple times in the medium, twice, three times or even four times to impregnate a certain amount of active component on the carrier, which causes problems such as complicated preparation process, long preparation cycle, and loss of active component; (3 ) In the process of multiple impregnation, it is often necessary to add organic or inorganic dispersants to the impregnation solution to increase the dispersion of active metal components, but these will have the problem of removal during post-treatment

However, the active metal compound and aluminum hydroxide dry rubber powder or alumina powder are directly mixed and formed by kneading method. This method has problems such as uneven mixing of crystal particles and deterioration of catalyst strength. It is not easy to combine with each other to form a specific skeleton structure

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