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A kind of isomerization catalyst preparation method with ato type structure molecular sieve as carrier

A molecular sieve and catalyst technology, applied in the field of isomerization catalyst preparation, can solve the problems of reducing the number of micropores, increasing the strong acid site, affecting the performance of the catalyst, and achieving reduced energy consumption, high micropore pore volume, high isomerization selectivity and Effect of Isomer Yield

Active Publication Date: 2022-01-25
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

Similar to the aforementioned molecular sieve release methods, the preparation of catalysts based on ATO-type molecular sieves often uses high-temperature (not lower than 450°C) roasting to remove the template agent in molecular sieves. This conventional high-temperature (not lower than 450°C) roasting release The method affects the distribution of acid sites, the amount of acid and the number of micropores on the ATO molecular sieve, so that the number of micropores decreases, the number of medium-strength acid sites decreases, and the strong acid sites increase, which in turn affects the performance of the catalyst

Method used

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  • A kind of isomerization catalyst preparation method with ato type structure molecular sieve as carrier
  • A kind of isomerization catalyst preparation method with ato type structure molecular sieve as carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Get 120g of SAPO-31 molecular sieve former powder (same as the comparative example, Si content is 0.6wt.%) containing di-n-propylamine template (content is 10wt.% of molecular sieve weight), 210 ℃ of roasting 12h under nitrogen atmosphere, after roasting Molecular sieve-loaded carbon and organic matter content is 7.3wt.%; then continue roasting for 6 hours at 250°C in an air atmosphere to obtain about 105g of SAPO-31 molecular sieve carrier with template agent partially removed, the molecular sieve-loaded volume carbon and organic matter content is 5.0wt. .%, micropore volume is 0.015cm 3 / g. With 5mL of H containing Pt 0.05g / mL 2 PtCl 6 The solution was impregnated with 50 g of the above carrier, dried naturally at 120° C. for 4 h, and reduced with hydrogen at 400° C. for 4 h to prepare a 0.5 wt.% Pt / SAPO-31 catalyst. The content of carbon deposits and organic matter in the catalyst is 0, the amount of medium-strong acid is 0.72mmol / g, the amount of strong acid is 0...

Embodiment 2

[0048] Get 120g MgAPO-31 molecular sieve former powder (Mg content is 0.05wt.%) that contains di-n-propylamine templating agent (content is 12wt.% of molecular sieve weight), 220 ℃ of roasting 6h under nitrogen atmosphere, after roasting, molecular sieve loads bulk carbon and The content of organic matter is 8.0wt.%; and then roasted at 350°C for 12 hours in an air atmosphere to obtain about 105g of MgAPO-31 molecular sieve carrier from which the template agent has been partially removed. Capacity is 0.034cm 3 / g. With 5mL of H containing Pt0.05g / mL 2 PtCl 6 The solution was impregnated with 50 g of the above-mentioned carrier, dried naturally at 120° C. for 4 h, and reduced with hydrogen at 400° C. for 2 h to prepare a 0.5 wt.% Pt / MgAPO-31 catalyst. The content of carbon deposits and organic matter in the catalyst is 0, the amount of medium-strong acid is 0.76mmol / g, the amount of strong acid is 0.12mmol / g, and the volume of micropores is 0.058cm 3 / g. See Table 1 for th...

Embodiment 3

[0050] Get 120g ZnAPO-31 molecular sieve former powder (Zn content is 1wt.%) that contains diisopropylamine templating agent (content is 20wt.% of molecular sieve weight), 250 ℃ of roasting 2h under nitrogen atmosphere, after roasting, molecular sieve loads bulk carbon and organic matter content of 7.6wt.%; then roasted at 200°C for 12h in an ozone atmosphere to obtain about 105g of ZnAPO-31 molecular sieve carrier from which the template was partially removed. 0.031cm 3 / g. With 5mL of H containing Pt0.05g / mL 2 PtCl 6 The solution was impregnated with 50 g of the above carrier, dried naturally at 120° C. for 4 h, and reduced with hydrogen at 200° C. for 8 h to obtain a 0.5 wt.% Pt / ZnAPO-31 catalyst. The content of carbon deposits and organic matter in the catalyst is 0, the amount of medium-strong acid is 0.78mmol / g, the amount of strong acid is 0.15mmol / g, and the volume of micropores is 0.060cm 3 / g. See Table 1 for the characterization results of carbon deposits, orga...

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Abstract

The invention discloses a method for preparing an isomerization catalyst with an ATO structure molecular sieve as a carrier. The specific steps of the preparation method are as follows: firstly, in an inert atmosphere at 50-300°C, the raw powder of the template-containing molecular sieve with an ATO structure is subjected to partial release agent treatment; and then in an oxygen-containing atmosphere at 50-400°C, partially The molecular sieve with the ATO structure after the template release agent is further treated with the template release agent, and then the metal active component is loaded on the obtained molecular sieve carrier, and the target catalyst is obtained through drying and reduction. By controlling the removal method of the template agent in the molecular sieve carrier, the effective regulation of its acidity and pore properties is realized. Compared with the catalyst prepared in the prior art, the catalyst prepared by the method of the invention has higher isomerization selectivity and isomer yield in normal paraffin isomerization reaction.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, fine chemical industry and molecular sieve catalyst, and specifically relates to a preparation method and application of an isomerization catalyst with an ATO structure molecular sieve as a carrier. Background technique [0002] The bifunctional solid catalyst is widely used in the process of alkane hydroisomerization, which is composed of hydrogenation-dehydrogenation component and acid carrier. Among them, the hydrogenation-dehydrogenation components are mainly Group VIII metals such as Pt, Pd, Rh, Ir and Ni, etc.; the acidic supports can be divided into the following three categories: 1. Amorphous single metal oxide or composite oxide, as halide-treated Al 2 o 3 , SiO 2 / Al 2 o 3 , superacid ZrO 2 / SO 4 2- 、WO 3 / ZrO 2 2. Aluminosilicate molecular sieve series, such as Y, Beta, ZSM-5, etc.; 3. Aluminum phosphate molecular sieve series, such as SAPO-5, SAPO-11, SAPO-31 and SAPO-4...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/83B01J29/85C10G45/62C10G45/64
CPCC10G45/62C10G45/64B01J29/83B01J29/85C10G2300/70
Inventor 王从新田志坚吕广马怀军潘振栋王冬娥李鹏曲炜
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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