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C7-C10 n-alkane isomerization catalyst and preparation method thereof

A catalyst and isomerization technology, applied in the direction of isomerization hydrocarbon production, physical/chemical process catalyst, molecular sieve catalyst, etc., can solve the problems of weak acidity, reduce the crystallinity of molecular sieve, etc., and achieve low cracking activity and product liquid yield The effect of high and good isomerization product selectivity

Active Publication Date: 2012-08-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the introduction of aluminum atoms into the framework of MCM-41 molecular sieves can produce acidic Al-MCM-41 molecular sieves, the resulting acidity is very weak, and the introduction of aluminum atoms will seriously reduce the crystallinity of molecular sieves.

Method used

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  • C7-C10 n-alkane isomerization catalyst and preparation method thereof
  • C7-C10 n-alkane isomerization catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Preparation of pure silicon MCM-41 mesoporous molecular sieves.

[0024] Solution a: Take 4.31ml of sodium silicate solution and disperse it in 50ml of water, and add 10.1ml of cetyl ammonium hydroxide solution with a concentration of 40% under stirring.

[0025] Prepare solution b: Dissolve 18.2 grams of cetyl ammonium bromide in 150 ml of hot water at 50°C.

[0026] Add the prepared solution a dropwise to solution b, stir for 30 minutes, add 4.52 grams of silicon dioxide, stir vigorously for 2 hours to form a gel, then adjust the pH of the solution to 11 with dilute sulfuric acid, and stir for 1 hour; Transfer to a polytetrafluoroethylene-lined crystallization kettle for crystallization at 80°C for 72 hours. The crystallized product was filtered, washed, dried at 110°C for 12 hours, and calcined at 580°C for 5 hours to obtain pure silicon MCM-41 mesoporous molecular sieve S 1 , and its physical and chemical data are shown in Table 1.

example 2

[0028] Preparation of the catalyst of the present invention.

[0029] Get the S prepared by Example 1 1 8.0 grams of molecular sieves, 2.0 grams of pseudo-boehmite powder (produced by SaSol, PURAL SB, alumina content 74% by mass) were mixed uniformly, 6.7 ml of 6.0% by mass of nitric acid solution was added and kneaded, extruded, dried at 120°C for 2 hours, Baking at 550°C for 4 hours. with 2.5 g H3 PW 12 o 40 25 milliliters of the solution was statically impregnated at 25°C for 12 hours, and the impregnated solid was dried at 120°C for 2 hours and calcined at 550°C for 4 hours to make a composite carrier. The composite support was impregnated with 5.0 milliliters of chloroplatinic acid solution with a Pt content of 7.5 mg / ml for 24 hours. After impregnation, the solid was dried at 120°C for 2 hours and calcined at 650°C for 4 hours to obtain catalyst A. The composition is shown in Table 2, wherein platinum The content is calculated based on the composite carrier.

example 3

[0031] Prepare the catalyst by the method of example 1, the difference is that 10 grams of S 1 Molecular sieves and 10 grams of pseudo-boehmite powder are mixed evenly, and 13.2 milliliters of 6 mass % nitric acid solution are added to knead, extruded into strips, dried and roasted, and then used to contain 7.5 grams of H 3 PW 12 o 40 25 ml of phosphotungstic acid solution was impregnated at 25°C for 12 hours, dried and calcined to make a composite carrier, then impregnated with 11.0 ml of chloroplatinic acid solution with a Pt content of 7.5 mg / ml for 24 hours, and dried at 120°C for 2 hours, Catalyst B was prepared by calcining at 650°C for 4 hours, and its composition is shown in Table 2.

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Abstract

The invention discloses a C7-C10 n-alkane isomerization catalyst which comprises a composite carrier and 0.05-3.0% of platinum by mass based on carrier, wherein the composite carrier comprises 20-70% of MCM-41 molecular sieve by mass, 10-35% of phosphotungstic acid by mass and 10-50% of aluminum oxide by mass. The catalyst is used for the isomerization reaction of the C7-C10 n-alkane, and has relatively high isomerization activity, high product liquid yield and relatively high selectivity of highly branched alkane.

Description

technical field [0001] The invention is a catalyst for isomerization of n-paraffins and a preparation method thereof, in particular, a C catalyst containing mesoporous molecular sieves in a carrier 7 ~C 10 Normal paraffin isomerization catalyst and preparation method thereof. Background technique [0002] In recent years, as the country has paid more and more attention to environmental protection, the quality specifications of motor gasoline products have become more and more stringent, and the restrictions on the content of aromatics and olefins in gasoline have become more and more stringent. Isomerized oil is a low-sulfur, olefin-free, benzene-free and aromatic-free environmentally friendly product. It has the advantages of high octane number, low sensitivity, low Reid vapor pressure, and clean combustion. It is an ideal clean gasoline blending with more potential components. [0003] Early n-alkane isomerization catalysts were mainly Friedel-Crafts type catalysts, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/78C07C5/27C07C9/16
Inventor 孔令江孙义兰张秋平于中伟马爱增
Owner CHINA PETROLEUM & CHEM CORP
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