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

A technology of co-crystallized molecular sieves and catalysts, applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems affecting process economy, catalyst activity decline, raw material conversion rate reduction, etc., and achieve hydrothermal stability Good performance and regeneration performance, uniform reaction bed temperature, and stable product distribution

Active Publication Date: 2013-10-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 exoth

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A certain amount of rare earth-ZSM-5 / ZSM-11 co-crystal molecular sieve (average grain size 450nm, silicon-aluminum ratio 120, rare earth content accounts for 1.8wt% of co-crystal molecular sieve, ZSM-5 and ZSM-11 crystal phase ratio is 35:65), zinc nitrate, phosphoric acid, aluminum sol, kaolin, and deionized water were uniformly mixed, sprayed at an inlet temperature of 620°C, an exhaust gas temperature of 200°C, and a spray pressure of 5.0MPa, and baked at 620°C Catalyst A was prepared in 2 hours. Among them, rare earth ZSM-5 / ZSM-11 co-crystal molecular sieve, ZnO, P 2 o 5 And the weight content of aluminum oxide is 62%, 3.0%, 2.5% and 25% respectively.

Embodiment 2

[0020] A certain amount of rare earth-ZSM-5 / ZSM-11 co-crystal molecular sieve (average grain size 230nm, silicon-aluminum ratio 55, rare earth content accounts for 3.2wt% of co-crystal molecular sieve, ZSM-5 and ZSM-11 crystal phase ratio is 81:19), zinc nitrate, phosphoric acid, aluminum nitrate, kaolin, and deionized water were uniformly mixed, sprayed and molded at an inlet temperature of 520°C, an exhaust gas temperature of 180°C, and a spray pressure of 2.0MPa, and roasted at 550°C for 3 Catalyst B was prepared. Among them, rare earth ZSM-5 / ZSM-11 co-crystal molecular sieve, ZnO, P 2 o 5 And the weight content of aluminum oxide is respectively 55%, 5.0%, 3.8% and 20%.

Embodiment 3

[0022] A certain amount of rare earth-ZSM-5 / ZSM-11 co-crystal molecular sieve (average grain size 360nm, silicon-aluminum ratio 180, rare earth content accounts for 1.0wt% of co-crystal molecular sieve, ZSM-5 and ZSM-11 crystal phase ratio is 45:55), zinc nitrate, ammonium dihydrogen phosphate, aluminum sol, kaolin, and deionized water were uniformly mixed, and sprayed under the conditions of inlet temperature of 550°C, tail gas temperature of 200°C, and spray pressure of 8.2MPa. 580 The catalyst C was prepared by calcining at ℃ for 2 hours. Among them, rare earth ZSM-5 / ZSM-11 co-crystal molecular sieve, ZnO, P 2 o 5 And the weight content of aluminum oxide is respectively 50%, 2.0%, 1.5% and 25%.

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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...

Claims

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Application Information

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IPC IPC(8): B01J29/80C10G50/00C10G3/00C10G1/00
CPCY02P30/20
Inventor 朱向学安杰徐龙伢谢素娟刘盛林王玉忠陈福存
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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