Catalyst for preparing hydrocarbon fuel by oil and fat hydrogenation, preparation and application

Abstract

The invention relates to a preparation method of a catalyst used for preparing a liquid fuel by oil and fat hydrogenation. The method comprises the following specific preparation steps: firstly, mixing a calcined ZSM-22 molecular sieve and an amorphous oxide precursor, performing strip extrusion, performing molding, and performing calcination to prepare a carrier precursor; filling pore channels of the carrier precursor with monomer molecules of a polymer, and performing heating treatment to obtain a carrier with partially-covered molecular sieve acidic sites and partially-blocked molecular sieve pore channels; and supporting a metal active component on the carrier, performing drying, and performing reduction to obtain the target catalyst. Compared with a catalyst prepared in the prior art, the catalyst prepared by adopting the method provided by the invention has the higher isoparaffin selectivity and yield in the process of preparing the liquid fuel by oil and fat hydrogenation.

Description

technical field [0001] The invention belongs to the field of molecular sieve catalysts, in particular to a ZSM-22 molecular sieve-based fuel catalyst for oil hydrogenation to hydrocarbons and a preparation method thereof. Background technique [0002] With the continuous development of economy and society, the reduction of primary energy such as oil and coal has brought about energy shortage. The price of crude oil and coal has been rising in recent years, which has also affected the price of motor fuel. In addition, since petroleum and coal are both carbon-containing resources and contain elements such as nitrogen and sulfur, carbon dioxide and toxic gases that are harmful to the environment will inevitably be produced during their conversion and product use. Based on this, and also due to political and economic factors, some countries have introduced relevant policies to restrict the use of fossil energy products. For example, the European Union launched a carbon tax coll...

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Problems solved by technology

[0011] 4. Molecular sieve micropores with suitable depth: The hydroisomerization of linear alkanes is mainly carried out at the molecular sieve micropore openings. If the molecular sieve micropore channels are too deep, the probability of linear alkanes completely or mostly inserting into the micropore channels increases. The desorption is hindered, which increases the probability of cracking at the insertion end, which makes it easy to generate small molecular hydrocarbons, which reduces the selectivity and yield of the target product

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