A kind of nickel-silver series hydrogenation catalyst and preparation method thereof

Abstract

The invention relates to a nickel-silver series catalyst and a preparation method thereof, in particular to a preparation method of a nickel-silver series hydrogenation catalyst with nickel-containing alumina as a carrier. Contains active components nickel and silver, with nickel-containing alumina as the carrier, the precursor of the nickel-containing alumina carrier is nickel-containing pseudo-boehmite, and the preparation process of the nickel-containing pseudo-boehmite has acid-base neutralization and gelling process. The specific carrier used in the catalyst of the present invention has the advantage of being able to organically combine nickel and pseudo-boehmite, so that the active component nickel is effectively dispersed in pseudo-boehmite, and nickel-containing alumina of a specific crystal form is formed At the same time, the carrier has a good adjustment effect on the pore structure and acidity of the carrier. Compared with the catalyst prepared by the impregnation method, it has the advantages of simple process and easy adjustment of the performance of the carrier material. The nickel-silver hydrogenation catalyst of the invention has high hydrogenation activity and selectivity, and good chemical stability and thermal stability.

Description

technical field [0001] The invention relates to a nickel-silver catalyst and a preparation method thereof, in particular to a preparation method of a nickel-silver hydrogenation catalyst with nickel-containing alumina as a carrier. Background technique [0002] In 2017, China's ethylene production capacity will continue to show an upward trend. 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 gasoline properties. In industry, two-stage hydrogenation is generally used for refining. First, a low-temperature liquid-phase hydrogenation saturated chain conjug...

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.

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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