Rare earth element modified hydroisomerization catalyst, synthesis method and application thereof

Abstract

The invention provides a rare earth element modified hydroisomerization catalyst, a synthesis method and application thereof. The method includes the steps of: 1) adding a silicon source and a salt containing rare earth element into an acid source solution, conducting heating and stirring the substances uniformly to obtain a silicon source gel containing rare earth element; 2) adding a solution containing an aluminum source, an alkali source and an organic template agent into the silica source gel containing rare earth element, and stirring the substances evenly to obtain a gel mixture; 3) crystallizing the gel mixture, then conducting separation, drying, first roasting, ion exchange and second roasting on the crystallized product to obtain an H type molecular sieve; and 4) loading a noblemetal to the H type molecular sieve, and conducting drying and roasting to obtain the rare earth element modified hydroisomerization catalyst. The catalyst provided by the invention has the characteristics of simple process, low cost and high efficiency, and when the catalyst is applied to hydroisomerization reaction, the isomerization product has high selectivity and yield.

Description

technical field [0001] The invention relates to the field of inorganic chemistry, in particular to a rare earth element-modified hydroisomerization catalyst and its synthesis method and application. Background technique [0002] Lubricating oil is one of the most widely used chemical products, and its low-temperature fluidity greatly affects the performance of the oil, while the low-temperature fluidity of long-chain normal paraffins is poor and must be improved. Hydroisomerization dewaxing is to convert the long-chain n-alkanes in the oil into branched alkanes through hydroisomerization, and remove part of the wax, which not only reduces the pour point of the base oil, but also increases the viscosity index and yield. Compared with solvent refining and catalytic dewaxing processes, hydroisomerization dewaxing has better advantages, and has become a hot spot in the field of petroleum refining recently. On the other hand, the long-chain n-alkanes obtained by the Fischer-Tro...

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Problems solved by technology

[0005] However, there is no relevant report on the synthesis of molecular sieve ZSM-22 containing rare earth metals with large atomic radius, and the silicon source and La or Ce source are firstly hydrolyzed under acidic conditions to obtain metal oxides and then the molecular sieve ZSM-22 is prepared. method has not yet been reported

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