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A kind of hydroisomerization catalyst and its preparation and application

A technology for hydroisomerization and catalyst, which is applied in the direction of isomerization to hydrocarbon production, physical/chemical process catalyst, molecular sieve catalyst, etc. The problem of high selectivity, to achieve the effect of high isomer selectivity and yield

Active Publication Date: 2019-12-06
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 carbocation generation and isomerization process in the hydroisomerization reaction of linear alkanes are all carried out on the acidic sites. The isomerization activity is poor on the acidic sites that are too weak, and the cracking selectivity is easily biased when the acidic sites are too strong. High; the hydroisomerization of linear alkanes is mainly carried out in the pores of molecular sieves. If the pores of molecular sieves are too deep, the probability of linear alkanes completely or mostly inserted into the pores increases, and the desorption is hindered, causing the insertion end to crack. The probability of increasing, so it is easy to generate small molecular hydrocarbons, so that the target product selectivity and yield decrease

Method used

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  • A kind of hydroisomerization catalyst and its preparation and application
  • A kind of hydroisomerization catalyst and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Take 120g of the SAPO-31 molecular sieve raw powder containing the template, and roast it in an air atmosphere at 550°C for 24h to obtain 100g of the SAPO-31 molecular sieve from which the template has been completely removed; take 30g of pseudoboehmite (alumina hydrate) and Mix well, add 80g 5wt% HNO 3 solution, kneaded, shaped by extruder, dried naturally, then dried at 120°C for 4h, and roasted at 550°C for 12h to obtain carrier precursor; take 50g of carrier precursor and 50g of n-octylamine, mix, and place at 25°C for 6h , after filtration, the carrier precursor adsorbing n-octylamine was obtained, dried at 120°C for 0.5h, and then placed in a quartz tube, under N 2 Under atmosphere, treat at 500°C for 4h and then cool to room temperature to prepare the carrier. 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 hours, and reduced with hydrogen at 500°C for 4 hours to...

Embodiment 2

[0064] Take 120g of the SAPO-31 molecular sieve raw powder containing the template, and roast it in an air atmosphere at 550°C for 24h to obtain 100g of the SAPO-31 molecular sieve from which the template has been completely removed; take 30g of pseudoboehmite (alumina hydrate) and Mix well, add 80g 5wt% HNO 3 solution, kneaded, molded with extruder, dried naturally, then dried at 120°C for 4h, and roasted at 550°C for 12h to obtain the carrier precursor; take 50g of the carrier precursor and 50g of 1,6-hexamethylenediamine mixed, 60 Place it at ℃ for 6h, filter and obtain the carrier precursor that adsorbs 1,6-hexanediamine, dry it at 120℃ for 0.5h, then put it in a quartz tube, under N 2 Under atmosphere, treat at 500°C for 4h and then cool to room temperature to prepare the carrier. With 5mL of H containing Pt 0.05g / mL 2 PtCl 6 The solution was impregnated with 50g of the above-mentioned carrier, dried naturally at 120°C for 4h, and reduced with hydrogen at 500°C for 4h ...

Embodiment 3

[0066] Take 120g of the SAPO-31 molecular sieve raw powder containing the template, and roast it in an air atmosphere at 550°C for 24h to obtain 100g of the SAPO-31 molecular sieve from which the template has been completely removed; take 30g of pseudoboehmite (alumina hydrate) and Mix well, add 80g 5wt% HNO 3 solution, kneaded, molded with extruder, dried naturally, then dried at 120°C for 4h, and roasted at 550°C for 12h to obtain carrier precursor; take 50g of carrier precursor and 50g of caprolactam, mix them, place at 70°C for 6h, filter After that, the carrier precursor for adsorbing caprolactam was dried at 120°C for 0.5h, then placed in a quartz tube, under N 2 Under atmosphere, treat at 500°C for 4h and then cool to room temperature to prepare the carrier. With 5mL of H containing Pt 0.05g / mL 2 PtCl 6 The solution was impregnated with 50g of the above-mentioned carrier, dried naturally at 120°C for 4h, and reduced with hydrogen at 500°C for 4h to obtain a 0.5wt% Pt...

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Abstract

The invention relates to a catalyst for alkane hydroisomerization, a preparation method and application thereof. The catalyst is composed of one or two metals among Pt, Pd and Ir in Group VIII noble metals with a content of 0.05-5wt%, SAPO-31 molecular sieve and amorphous oxide containing organic matters or carbon deposits. The specific preparation steps are as follows: first, mix the calcined SAPO-31 molecular sieve with the precursor of the amorphous oxide, extrude, shape and roast to make the carrier precursor; use the carrier precursor to absorb the organic amine, and then in an inert atmosphere Carrying out temperature-raising treatment to obtain a carrier with molecular sieve acid sites partially covered and pores partially blocked; metal active components are loaded on the carrier, and the target catalyst is obtained after drying and reduction. Compared with the catalyst prepared in the prior art, the catalyst prepared by the method of the invention has higher isoparaffin selectivity and yield in alkane hydroisomerization reaction.

Description

technical field [0001] The invention belongs to the field of molecular sieve catalysts, and in particular relates to a hydroisomerization catalyst based on SAPO-31 molecular sieves, a preparation method and application thereof. Background technique [0002] Early alkane hydroisomerization 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 hydroisomerization. [0003] The bifunctional solid catalyst is composed of a hydrogenation-dehydrogenation component and an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85B01J35/10C07C5/27C07C9/16
CPCC07C5/2708B01J29/85B01J2229/186B01J2229/14B01J35/633C07C9/16
Inventor 王从新田志坚吕广李鹏马怀军曲炜王琳韩健强
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI