Mixed mesoporous carrier of light alkane dehydrogenation catalyst and preparation method thereof

A dehydrogenation catalyst, a technology of low-carbon alkanes, applied in the direction of hydrocarbons, hydrocarbons, molecular sieve catalysts, etc., can solve the problems of easy coking and carbon formation, low carrier strength, etc., to reduce surface acidity, good thermal stability, tight connection effect

Active Publication Date: 2017-11-28
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carrier can well solve the problems of low carrier strength and easy coking and carbon generation in the prior art, and can be used in the industrial production of low-carbon alkanes dehydrogenation to low-carbon olefins

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Accurately weigh 205g of aluminum hydroxide powder prepared by alkali method and aluminum hydroxide powder prepared by acid method in a ratio of 1:0.1, add 25g of MCM-41 molecular sieve, 2.5g of turnip powder and 7.5g of oxalic acid , mix the dry powder thoroughly for later use.

[0029] (2) Prepare a mixed peptizer of nitric acid and citric acid with a total mass of 7.5 g at a volume ratio of 1:0.5. As solution A, weigh 2.5 g of magnesium sulfate and dissolve it in deionized water to make solution B. Add solution A and solution B evenly to the dry carrier powder by spraying, and knead while spraying, the water-powder ratio is 0.7, and the volume ratio of solution A to solution B added is 1:0.5;

[0030] (3) After fully kneading for 15 minutes, let it air for 45 minutes, and then place it in a single-screw extruder for extrusion molding at a uniform speed. According to the catalyst evaluation requirements later, the length of the intercepted catalyst is 0.6 mm.

[...

Embodiment 2

[0034] (1) Accurately weigh 179g of the aluminum hydroxide powder prepared by the alkali method and the aluminum hydroxide powder prepared by the acid method in a ratio of 1:5, add 50g of HMS molecular sieves, 2.5g of turnip powder and 7.5g of tartaric acid, and The dry powder is mixed thoroughly for later use.

[0035] (2) Prepare a mixed peptizer of sulfuric acid and formic acid with a total mass of 7.25 g at a volume ratio of 1:0.8. As solution A, weigh 3.75 g of sodium nitrate and dissolve it in deionized water to make solution B. Add solution A and solution B to the dry carrier powder uniformly by spraying, and knead while spraying. The ratio of water to powder is 0.8, and the volume ratio of solution A to solution B added is 1:0.5.

[0036] (3) After fully kneading for 30 minutes, let it air for 30 minutes, and then place it in a single-screw extruder for extrusion molding at a uniform speed. According to the catalyst evaluation requirements later, the length of the inte...

Embodiment 3

[0040] (1) Accurately weigh 160g of the aluminum hydroxide powder prepared by the alkali method and the aluminum hydroxide powder prepared by the acid method in a ratio of 1:25, add 62.5g of ZSM-5 molecular sieves, 2.5g of turnip powder and 7.5g of Tartaric acid, mix the dry powder well and set aside.

[0041] (2) Prepare 7.5g of hydrochloric acid and malonic acid mixed peptizer according to the volume ratio of 1:1. As solution A, weigh 12.5g of cerium nitrate and dissolve it in deionized water to make solution B. The solution A and solution B are uniformly added to the dry carrier powder by spraying, kneading while spraying, the water-powder ratio is 0.9, and the volume ratio of solution A and solution B added is 1:0.5.

[0042] (3) After fully kneading for 35 minutes, let it air for 25 minutes, and then place it in a single-screw extruder for extrusion molding at a uniform speed. According to the catalyst evaluation requirements later, the length of the intercepted catalyst ...

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Abstract

The invention relates to a catalyst carrier prepared from mixed aluminum oxide and mesoporous molecular sieve and a preparation method thereof. The mixed mesoporous carrier is prepared by the following steps of: adding the mesoporous molecular sieve and various auxiliary agent into a conventional aluminum oxide source; performing mixing and extrusion moulding; and then performing hydrothermal treatment, drying and roasting to finally obtain a finished product dehydrogenation catalyst carrier. The prepared light alkane dehydrogenation catalyst carrier has high mechanical strength, good thermal stability and enhanced catalysis activity.

Description

technical field [0001] The invention relates to a mesoporous carrier and a preparation method of a low-carbon alkane dehydrogenation catalyst, in particular to a catalyst carrier prepared by mixing alumina and mesoporous molecular sieves. Background technique [0002] Low-carbon olefins mainly come from co-production or by-products of steam cracking and fluid catalytic cracking in refineries, and can be widely used in the synthesis of polymers, gasoline additives, rubber and various chemical intermediates. With the increasing demand for low-carbon olefins, the traditional production process is difficult to meet the rapid growth of market demand. However, a large amount of low-carbon alkanes obtained by refineries are mainly used for civil fuels, and the utilization rate is low. The reaction of catalytic dehydrogenation of low-carbon alkanes to prepare corresponding olefins can solve the above problems well. On the one hand, the reaction uses low-carbon alkanes as the main r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70B01J29/78B01J29/40B01J29/48B01J29/85C07C5/333C07C11/09
CPCC07C5/3335B01J29/40B01J29/48B01J29/70B01J29/78B01J29/85B01J35/1019B01J2229/18C07C11/09Y02P20/52
Inventor 王广建牛鑫善王芳
Owner QINGDAO UNIV OF SCI & TECH
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