Hydrodewaxing catalyst as well as preparation method and application thereof

Abstract

The invention discloses a hydrodewaxing catalyst as well as a preparation method and application thereof. The hydrodewaxing catalyst is prepared by using a carrier modified with alkaline-earth metals and silicon. The carrier is modified through the following steps: firstly loading the alkaline-earth metals onto the carrier by a traditional carrier immersion method; and then modifying the carrier with silicon oil to form a silica coating on the surface of the carrier. By utilizing the method, the acidity of internal and external surfaces of a molecule sieve and the shape of holes can be effectively adjusted, thereby being beneficial for wax molecules to diffuse into the hole paths of the molecule sieve and be subjected to a shape-selective cracking reaction. Thus the catalyst provided by the invention has the advantages of higher catalyst activity and better target product selectivity. Moreover, due to the weak acidity of the external surface of the molecule sieve and low cracking capacity, the side reaction in the preparation of the target products are reduced. The catalyst is suitable for the hydrodewaxing process of wax-containing raw materials, especially for a hydrodewaxing process of diesel oil or lubricating oil.

Description

technical field [0001] The invention relates to a hydrogenation dewaxing catalyst and a preparation method thereof. The catalyst is used in the hydrodewaxing process of waxy hydrocarbon raw materials, especially in the hydrodewaxing process of diesel oil or lubricating oil. Background technique [0002] Hydrodewaxing refers to the reduction of the waxy molecular content of a waxy hydrocarbon feedstock on the surface of a suitable catalyst in the presence of hydrogen. The principle of dewaxing is that under certain operating conditions, the raw material is mixed with hydrogen and contacted with a hydrodewaxing catalyst. High freezing point components such as aromatics are selectively cracked into small molecules, while other components are basically unchanged, and the purpose of lowering the freezing point of the oil is finally achieved. See US3,894,438, US3,894,439, US 4,173,148 for the specific catalytic dewaxing process. Diesel hydrodewaxing is generally called diesel h...

AI Technical Summary

Problems solved by technology

This method adopts the method of high-temperature roasting catalyst support to reduce the acidity of the catalyst, and its main disadvantage is that the aluminum atoms on the outer surface of the molecular sieve cannot be selectively removed during the high-temperature roasting dealumination process, thereby affecting the improvement of the selectivity of the catalyst, and dealumination When the degree is deep, it will also cause the collapse of the molecular sieve framework, which will reduce the selectivity of paraffins.

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