A kind of nickel-based selective hydrogenation catalyst and preparation method thereof

Abstract

The invention relates to a nickel-series selective hydrogenation catalyst. The catalyst comprises an alumina carrier having a macroporous structure, and metal active components-nickel and tungsten which are loaded on the carrier, wherein the content of nickel oxide is 12-22wt% of the total weight of the catalyst, the content of tungsten oxide is 1.5-8wt% of the total weight of the catalyst, the alumina carrier is prepared by taking chitosan as a pore-expanding agent, the alumina carrier having the macroporous structure contains auxiliary components-phosphorus and magnesium, and the contents of the auxiliary components-phosphorus (P2O5) and magnesium (MgO) respectively account for 0.1-2.5wt% and 0.1-2.5wt% of the mass of the carrier; the pore diameter distribution is 60-180nm, the macroporous proportion is 2-75%, the pore volume is 0.8-2.0ml / g, and the specific surface area is 250-300m<2> / g. The catalyst is better in glue containing capacity and high in arsenic resistance, sulfur resistance and coking inhibition.

Description

technical field [0001] The invention relates to a selective hydrogenation catalyst for petroleum hydrocarbon products and a preparation method thereof, in particular to a nickel-based selective hydrogenation catalyst for one-stage selective hydrogenation of pyrolysis gasoline. Background technique [0002] Pyrolysis gasoline is an important by-product of steam cracking industrial production of ethylene and propylene, including C5-C10 fractions. The composition of pyrolysis gasoline is very complex, mainly including benzene, toluene, xylene, mono-olefins, di-olefins, straight-chain alkanes, cycloalkanes, and organic compounds of nitrogen, sulfur, oxygen, chlorine and heavy metals, etc., a total of more than 200 components, of which Benzene, toluene, and xylene (collectively referred to as BTX) are about 50-90%, and unsaturated hydrocarbons are 25-30%. According to the characteristics of a large amount of aromatics in pyrolysis gasoline, it has a wide range of uses. It can be...

AI Technical Summary

Problems solved by technology

The disadvantage is that the size of the macropore (300nm or 400nm) is completely determined by the size of the polystyrene droplet introduced twice, that is, the size of the macropore depends on the size of the polystyrene droplet

The pore size cannot be adjusted by partially changing the components of the solution itself and the interaction of organic molecules in the system

Huining Li et al. (Inorganic Chemistry, 2009, 48:4421) also used the sol-gel method to introduce polymethyl methacrylate (PMMA) droplets with a single dispersed phase into the mixed solution using F127 as a template to achieve large Pore-the formation of macropores in mesoporous alumina, the disadvantage is that the size of the macropores is completely determined by the size of the secondary introduction of polymethyl methacrylate droplets, which cannot be achieved by partially changing the components of the solution system itself The adjustment of the pore size is used to realize the formation of the macropore-mesopore composite pore structure, so it is impossible to realize the controllable adjustment of the macropore-mesopore diameter. In the process of use, especially for the macromolecular catalytic process of complex components limitations

CN200610118523.1 The present invention relates to a method for selective hydrogenation of full-run pyrolysis gasoline, which mainly solves the technical problem in the prior art that it is difficult to selectively hydrogenate full-run pyrolysis gasoline with high colloid and water content

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