Phenol ortho-position targeted methylation catalyst as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of catalysts, and relates to a phenol ortho-position targeted methylation catalyst and a preparation method and application thereof, and the method comprises the following steps: 1) preparing an iron-based precursor A; preparing a chromium-cobalt crystal form precursor B; 3) preparing a catalyst precursor from the iron-based precursor A, the chromium-cobalt crystal precursor B and a TiO2 carrier; 4) modifying the catalyst precursor by adopting a potassium solution; obtaining a catalyst; and 5) carrying out primary screening, tabletting and multi-stage screening on the catalyst to obtain the phenol ortho-position targeted methylation catalyst. The catalyst provided by the invention has the characteristics of high catalytic activity, outstanding thermal stability, high mechanical strength and sintering resistance, and also has the advantages of cheap and easily available raw materials, environmental protection, long service life and the like; meanwhile, when the catalyst is used as a medium and low temperature coal tar phenolic compound catalyst, the selectivity on ortho-targeted methylation is good, the number of catalyst sites is large, and the conversion rate is high.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a phenolic ortho-targeted methylation catalyst and a preparation method and application thereof. Background technique [0002] In recent years, my country's coal tar output has basically stabilized at 2500×10 4 About t, of which high-temperature tar accounts for 1000×10 4 Above t, the content of phenol oil is very small, while low-temperature or medium-low temperature tar contains more phenolic oil; the phenolic compounds in medium-low temperature coal tar are mainly low-level phenols (accounting for about 9.8% of the total mass of tar, mainly including phenol, cresol, di Cresol), C 3 ~C 4 Alkylphenols and indenols, etc., phenolic compounds accounted for about 50.33%, of which phenol accounted for about 2.51%, m-cresol about 9.32%, p-cresol about 7.32%, 2,5-xylenol about 2.16% %, 3,5-xylenol accounts for about 1.34%. The existence of phenolic compounds leads to additional co...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical problems existing in the existing methylation catalysts, the present invention provides a phenolic ortho-targeted methylation catalyst and a preparation method thereof. The catalyst has high catalytic activity, outstanding thermal stability, high mechanical strength and anti-sintering ability It also has the advantages of cheap and easy-to-obtain raw materials, green environmental protection, and long service life.

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