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Preparation method and application of aluminum zinc phosphate molecular sieve catalyst

A technology of aluminum zinc phosphate and molecular sieves, which is applied in the direction of molecular sieve catalysts, catalyst activation/preparation, molecular sieve compounds, etc., can solve the problems of studying molecular level reaction mechanism, comprehensive understanding of limited reactions, poor conversion rate and selectivity, etc., to improve selectivity and high temperature stability, low production cost, and the effect of promoting dispersion

Active Publication Date: 2021-07-16
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite these prior art discoveries, the reaction mechanism at the molecular level has not been theoretically investigated, limiting a comprehensive understanding of the reaction
[0005] In summary, although non-Cd-based and Hg-based catalysts can avoid environmental and safety problems in the acetylene gas-phase hydration reaction currently studied, the use of transition metal ion catalysts for reactions at high temperatures has high energy consumption, poor conversion and selectivity, etc. problem, while catalyst deactivation due to carbon deposits requires frequent regeneration steps to restore its catalytic activity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) First, 19.6g of orthophosphoric acid with a mass fraction of 85% was added to 72.00g of deionized water, and then 2.48 g of zirconium nitrate (Zr(NO 3 ) 4 ·5H 2 O), then add 1.50g of hydroxypropyl cellulose, and heat to 50°C while stirring; then add 5.95g of zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O), after the zinc salt is completely dissolved, finally slowly add 14.61g pseudo-boehmite (Al 2 o 3 Content is 60wt%), after stirring evenly, add 10.12g triethylamine, and adjust pH with dilute hydrochloric acid to be 5.5, continuously stir to form uniform jelly;

[0036] (2) Transfer the obtained jelly into a homogeneous reaction kettle, age at 100°C for 6h, and after aging, raise the temperature to 180°C for constant temperature crystallization reaction for 36h to obtain a crystallized product;

[0037] (3) After washing and filtering the obtained crystallized product, dry it at 100°C for 6h, then move it into a calciner, raise the temperature to 550°C at a rate of 10°C / h...

Embodiment 2

[0042] The preparation method of zinc aluminum phosphate molecular sieve catalyst is similar to embodiment 1, and difference is that step (1) in embodiment 1 is added 5.95g zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O) was changed to add 3.67g zinc acetate (Zn(CH 3 COO) 2 ), other steps and conditions can be prepared Zr-ZAPO-5(0.2)-2 catalyst, (0.2) labeled ZnO / P 2 o 5 The molar ratio is 0.2.

Embodiment 3

[0044] The preparation method of aluminum zinc phosphate molecular sieve catalyst is similar to embodiment 1, and difference is that step (1) in embodiment 1 is added 2.48 zirconium nitrate (Zr(NO 3 ) 4 ·5H 2 O), instead add 1.52g zirconium oxychloride (Cl 2 OZr), other steps and conditions remain unchanged to prepare Zr-ZAPO-5(0.2)-3 catalyst, (0.2) marked ZnO / P 2 o 5 The molar ratio is 0.2.

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Abstract

The invention discloses a preparation method and application of an aluminum zinc phosphate molecular sieve catalyst. The preparation method comprises the following steps of: (1) adding orthophosphoric acid into deionized water, then adding soluble zirconium salt or soluble titanium salt and a dispersing agent, heating to 50-60 DEG C while stirring, then adding soluble zinc salt, and after the soluble zinc salt is completely dissolved, adding pseudo-boehmite, uniformly stirring, adding a template agent, adjusting the pH value to 5-6 by using diluted hydrochloric acid, and continuously stirring to form a uniform jelly; (2) transferring the jelly into a homogeneous reaction kettle, aging the jelly while stirring, and then heating for constant-temperature crystallization reaction to obtain a crystallized product; (3) washing and filtering the crystallized product, drying the crystallized product, transferring the crystallized product into a calcining furnace, heating to 550-600 DEG C, and keeping the temperature for 4-6 hours to obtain molecular sieve raw powder; and (4) adding the molecular sieve raw powder into an aqueous solution added with 10-20% of aluminum sol to further obtain the aluminum zinc phosphate molecular sieve catalyst. The method has the advantages of being simple in technological process, low in production cost, safe, environmentally friendly, suitable for industrial large-scale production and the like.

Description

technical field [0001] The invention belongs to the technical field of acetylene catalytic conversion, and in particular relates to a preparation method and application of an aluminum zinc phosphate molecular sieve catalyst. Background technique [0002] Acetaldehyde is a basic chemical raw material, and its application industries include pesticides, medicines, food additives, paints, oils, and preservatives. In recent years, the downstream products of acetaldehyde have developed rapidly, which has strongly stimulated the market demand for acetaldehyde, so the research on the production process route of acetaldehyde has been paid more and more attention. The synthesis process routes of acetaldehyde mainly include ethylene oxidation method, ethanol dehydrogenation method, ethanol oxidation method and acetylene hydration method. The direct oxidation of ethylene to acetaldehyde was developed in the 1950s. Since ethylene is cheaper and easier to obtain than acetylene, the direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/84C01B37/06C07C47/06C07C45/26
CPCB01J29/84B01J37/0063C01B37/065C07C45/26B01J2229/40B01J35/40C07C47/06
Inventor 连奕新王伦韬林海强胡新瑞钟静静董焕能
Owner XIAMEN UNIV
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