A low-pressure diesel hydrocracking catalyst, a preparation method and application thereof

By optimizing the composition of the support and active components, a low-pressure diesel hydrocracking catalyst using macroporous amorphous silica-alumina, mesoporous alumina, and hierarchical pore Y/mesoporous SBA composite molecular sieves was developed, solving the problem of low ethylene yield in existing technologies and achieving efficient production of ethylene cracking feedstock under low pressure.

CN117732504BActive Publication Date: 2026-07-10PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
PETROCHINA CO LTD
Filing Date
2022-09-05
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing hydrocracking catalysts cannot be used to produce oil products from feedstocks such as straight-run diesel and heavy, low-quality diesel, which are either not suitable for further cracking to produce ethylene, or the yield of ethylene produced by further cracking is low.

Method used

Using macroporous amorphous silica and mesoporous alumina as the main supports, hierarchical pore Y/mesoporous SBA composite molecular sieve as the acidic component, and combining group VIB and group VIII metal oxides as active components, the catalyst composition is optimized to achieve selective ring-opening cracking of cycloalkanes and aromatic components, and reduce excessive cracking of alkanes.

Benefits of technology

The catalyst significantly improves the yield of oil as ethylene cracking feedstock under low-pressure conditions, reducing the problems of diesel overproduction and ethylene feedstock shortage. The catalyst is suitable for simple modification of existing plants to produce high-quality ethylene cracking feedstock with a BMCI value of no more than 12.

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Abstract

The application provides a low-pressure diesel hydrocracking catalyst, which comprises a carrier, an active component supported on the carrier, a binder and an extrusion aid; the carrier comprises a matrix and an acidic component; the active component comprises VIB group metal and VIII group metal oxides, the matrix comprises macroporous amorphous silicon aluminum and mesoporous alumina, and the acidic component comprises a multi-stage pore Y / mesoporous SBA composite molecular sieve; and the macroporous amorphous silicon aluminum and the mesoporous alumina are specifically limited in physical and chemical properties. The catalyst uses the macroporous amorphous silicon aluminum and the mesoporous alumina with specific properties as the main carrier by optimizing the composition of the carrier material, uses the multi-stage pore Y / mesoporous SBA composite molecular sieve as the acidic component, and the carrier, the acidic component and the active component are matched with each other, so that the selectivity of naphthenes and high-aromatic ring opening can be significantly improved, excessive cracking of paraffins is reduced, the product has a low BMCI value, and the product is a high-quality raw material for ethylene cracking.
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