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Alkane isomerization catalyst and preparation method thereof

A technology for alkane isomerization and catalysts, which is applied in the field of preparation of the above-mentioned catalysts, can solve the problems of no acidity, no charge that can be exchanged, limited application of catalytic reactions, etc., and achieve the effect of low reaction temperature and high activity

Active Publication Date: 2017-06-06
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

The framework of this type of molecular sieve is strictly composed of PO 4 + and AlO 4 - Composed of alternating tetrahedrons, there is no charge that can be exchanged, so it is not acidic, and its application in catalytic reactions is extremely limited

Method used

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  • Alkane isomerization catalyst and preparation method thereof
  • Alkane isomerization catalyst and preparation method thereof
  • Alkane isomerization catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Weigh 70g of pseudo-boehmite, dissolve in 200g of deionized water, stir and mix evenly; weigh 130g of phosphoric acid, dissolve in 100g of deionized water, mix evenly; add the phosphoric acid solution dropwise to the pseudo-boehmite in a stirring state The solution forms a precursor mixture A; A is aged at 10°C for 4 hours; weigh 57g of diisopropylamine, add it dropwise to A, and stir evenly; then weigh about 45g of silica sol (30wt%), and add it dropwise to A , and stir evenly to form precursor mixture B; put B into a reaction kettle with a volume of 1L, and start crystallization at a temperature of 200°C for 24 hours; after the crystallization is completed, wash and filter the product until the filtrate is Neutral, the filtered product was dried in an oven at 120°C for 24 hours to obtain a silicon-aluminum phosphate composite molecular sieve SC1. Its X-ray diffraction spectrum is attached as image 3 , the acidic characterization results are attached Figure 4 The X...

Embodiment 2

[0070] Weigh 70g of pseudo-boehmite, dissolve in 200g of deionized water, stir and mix evenly; weigh 130g of phosphoric acid, dissolve in 100g of deionized water, mix evenly; add the phosphoric acid solution dropwise to the pseudo-boehmite in a stirring state The solution forms a precursor mixture A; A is aged at 0°C for 2 hours; weigh 57g of di-n-propylamine, add it dropwise to A, and stir evenly; then weigh about 45g of silica sol (30wt%), and add it dropwise to A , and stir evenly to form precursor mixture B; put B into a reaction kettle with a volume of 1L, and start crystallization at a temperature of 200°C for 24 hours; after the crystallization is completed, wash and filter the product until the filtrate is Neutral, the filtered product was dried in an oven at 120°C for 20 hours to obtain a silicon-aluminum phosphate composite molecular sieve SC1. The X-ray diffraction peak positions are summarized in Table 2.

Embodiment 3

[0072] Weigh 70g of pseudo-boehmite, dissolve in 200g of deionized water, stir and mix evenly; weigh 130g of phosphoric acid, dissolve in 100g of deionized water, mix evenly; add the phosphoric acid solution dropwise to the pseudo-boehmite in a stirring state The solution forms a precursor mixture A; A is aged at 0°C for 8 hours; weigh 57g of di-n-propylamine, add it dropwise to A, and stir evenly; then weigh about 23g of silica sol (30wt%), and add it dropwise to A , and stir evenly to form precursor mixture B; put B into a reaction kettle with a volume of 1L, and start crystallization at a temperature of 200°C for 24 hours; after the crystallization is completed, wash and filter the product until the filtrate is Neutral, the filtered product was dried in an oven at 120°C for 18 hours to obtain a silicon-aluminum phosphate composite molecular sieve SC1. The X-ray diffraction peak positions are summarized in Table 2.

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Abstract

The invention relates to an alkane isomerization catalyst and a preparation method thereof. The catalyst is composed of a silicoaluminophosphate composite molecular sieve and one or more of the non-noble metals Co, Ni, Mo and W with a content of 1-50wt%. The silicoaluminophosphate composite molecular sieve has a mixed crystal phase of SAPO-11 and an aluminum silicophosphate salt, an X-ray diffraction spectrum of the molecular sieve at least has the following diffraction peaks, with the 2theta value representing the diffraction peak position, 2theta / degree: 8.14+ / -0.2, 9.48+ / -0.2, 12.49+ / -0.1, 13.24+ / -0.2, 15.70+ / -0.2, 16.32+ / -0.2, 17.56+ / -0.2, 17.87+ / -0.1, 19.02+ / -0.2, 20.46+ / -0.2, 21.10+ / -0.2, 21.66+ / -0.1, 22.18+ / -0.2, 22.60+ / -0.2, 22.76+ / -0.2, 23.22+ / -0.2, 24.74+ / -0.2, 27.86+ / -0.1, 28.49+ / -0.1, 33.03+ / -0.1, 33.41+ / -0.1. Compared with the catalysts commonly used in the prior art, the catalyst provided by the invention has better catalytic activity when used for alkane isomerization reaction.

Description

technical field [0001] The invention relates to an alkane isomerization catalyst, in particular to an alkane isomerization catalyst composed of a silicon-aluminum phosphate composite molecular sieve and a non-noble metal with a content of 1-50 wt%. [0002] The present invention also relates to a method for preparing the above-mentioned catalyst. Background technique [0003] Early alkane isomerization catalysts were mainly liquid acid catalysts, such as AlCl 3 - HCl Freund's catalyst, sulfuric acid and liquid superacid catalyst. These liquid acid catalysts have high isomerization performance, usually at room temperature to 90 °C, can obtain near-equilibrium conversion, but poor selectivity and insufficient stability. In addition, due to strong corrosion of equipment and serious pollution to the environment, it has been basically eliminated at present. Since the 1940s, bifunctional solid catalysts have been gradually developed and applied to the process of alkane isomeriz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85
Inventor 王从新田志坚马怀军徐仁顺曲炜王琳潘振栋王冬娥李鹏
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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