Cocrystallization molecular sieve catalyst for aromatization, as well as preparation method and application thereof

Abstract

The invention relates to a cocrystallization molecular sieve catalyst for aromatization, as well as a preparation method and application thereof. The catalyst comprises 35 to 75 wt% of a small grain rare earth-ZSM-5 / ZSM-11 cocrystallization molecular sieve, 1.0 to 6.0 wt% of ZnO, 0.5 to 5.0 wt% of P2O5 and the balance of aluminium trioxide and kaolin. The catalyst is prepared through the following steps of: mixing the rare earth-ZSM-5 / ZSM-11, a ZnO precursor, a P2O5 precursor, an aluminium trioxide precursor, kaolin and water uniformly, performing spray forming and roasting. The catalyst is applied to the catalytic conversion process of raw materials comprising low-carbon hydrocarbon, a coal-based or biologically based oxygen-containing compound, waste plastic and the like, and has the characteristics of high yield of aromatic hydrocarbon or high-octane-value gasoline component, high hydrothermal stability and regenerability of the catalyst and the like.

Description

technical field [0001] The invention relates to the field of industrial catalysis, in particular to a co-crystal molecular sieve catalyst for aromatization, a preparation method and application thereof. Background technique [0002] Aromatization is an important petrochemical process for the production of aromatics and high-octane gasoline blending components, but in the prior art, this reaction process was mainly carried out in a fixed-bed reactor. However, in the process of fixed-bed aromatization reaction, as the reaction proceeds, the activity of the catalyst will inevitably decrease, resulting in a decrease in the conversion rate of raw materials and a change in the distribution of production; moreover, most aromatization processes are exothermic reactions, and a large amount of The generation of heat of reaction causes the temperature rise of the reaction bed to be too high, so that the catalyst cannot be carried out under the optimal reaction conditions, and a large a...

AI Technical Summary

Problems solved by technology

However, in the process of fixed-bed aromatization reaction, as the reaction proceeds, the activity of the catalyst will inevitably decrease, resulting in a decrease in the conversion rate of raw materials and a change in the distribution of production; moreover, most aromatization processes are exothermic reactions, and a large amount of The generation of heat of reaction causes the temperature rise of the reaction bed to be too high, so that the catalyst cannot be carried out under the optimal reaction conditions, and leads to a large amount of dry gas, which affects the economics of the process