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Preparation method of Al2O3-SiO3 solid acid catalyst in nuclear shell structure

A solid acid catalyst, al2o3-sio2 technology, applied in chemical instruments and methods, physical/chemical process catalysts, dehydration of hydroxyl-containing compounds to prepare ether, etc., can solve the problems of many by-products, high reaction temperature, high methanol consumption, and achieve The effect of high activity and stability

Inactive Publication Date: 2010-10-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] (1) The equilibrium conversion rate of the reaction is low, and a large amount of methanol needs to be recycled repeatedly, which increases the load of subsequent rectification separation;
[0012] (2) The high temperature reaction has strict requirements on the equipment, and the energy consumption of raw material pretreatment is relatively high;
[0013] (3) Under high temperature conditions, methanol dehydration is easy to generate hydrocarbons, long-chain hydrocarbons, and even carbon deposits on the surface of the catalyst, so the methanol consumption is high and the life of the catalyst is reduced
[0014] In addition, the catalysts currently used are generally Al alone 2 o 3 , HZSM-5, HY, SAPO, etc., they all have their own shortcomings
For example, although alumina has high stability, the reaction temperature is also high, and the requirements for reaction equipment are very high, resulting in high cost.
Molecular sieve catalysts have strong acidity and low initial temperature, but have many by-products, easy carbon deposition, and easy deactivation

Method used

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  • Preparation method of Al2O3-SiO3 solid acid catalyst in nuclear shell structure
  • Preparation method of Al2O3-SiO3 solid acid catalyst in nuclear shell structure
  • Preparation method of Al2O3-SiO3 solid acid catalyst in nuclear shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 11.038 grams of aluminum nitrate and 7.624 grams of hexamethylenetetramine, add 125 milliliters of deionized water, then stir to dissolve them, and record it as solution A. Weigh 0.214 grams of cetyltrimethylammonium bromide, add 20 grams of n-butanol, stir to dissolve it, and record it as solution B. Mix solution A and solution B in a polytetrafluoroethylene-lined autoclave with a certain volume, and seal and stir for 30 minutes. 15 g of silica gel (200-300 mesh, activated at 550° C.) was added under vigorous stirring. Put the reaction kettle into an oil bath, stir and heat vigorously for 24 hours, and the reaction temperature is 150°C. After the reaction, the reactor was cooled to room temperature, and vacuum filtered. Then wash with 2 liters of deionized water for 5 times, rinse with 25 milliliters of ethanol, and then transfer to a vacuum oven at 60°C for 12 hours to dry. Put the dried product into a muffle furnace and bake it at 500°C for 4 hours to obtain...

Embodiment 2

[0032] Referring to the preparation method and steps of Example 1, the difference is that the amount of silica gel is 7.5 grams. Get Al 2 o 320wt% core-shell structure Al 2 o 3 -SiO 2 composite solid acid catalyst.

[0033] Weigh 0.2 g of the catalyst prepared by the above method with a particle size of 40-60 mesh, and evaluate the methanol dehydration activity in a fixed-bed reactor.

[0034] Table 2.Al 2 o 3 20wt% core-shell structure Al 2 o 3 -SiO 2 The space-time yield of dimethyl ether on the composite solid acid catalyst ((gram-DME)*(gram-cat) -1 *Hour -1 )

[0035]

Embodiment 3

[0037] With reference to the preparation method and steps of Example 1, the difference is that the amount of silica gel is 3.75 grams to obtain Al 2 o 3 40wt% core-shell structure Al 2 o 3 -SiO 2 composite solid acid catalyst.

[0038] Weigh 0.2 g of the catalyst prepared by the above method with a particle size of 40-60 mesh, and evaluate the methanol dehydration activity in a fixed-bed reactor.

[0039] Table 3.Al 2 o 3 40wt% core-shell structure Al 2 o 3 -SiO 2 The space-time yield of dimethyl ether on the composite solid acid catalyst ((gram-DME)*(gram-cat) -1 *Hour -1 )

[0040]

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Abstract

The invention relates to a preparation method of an Al2O3-SiO3 solid acid catalyst in a nuclear shell structure. The Al2O3-SiO3 solid acid catalyst in the nuclear shell structure contains 10-80 wt% of Al2O3,is made from raw material of silica gel and an aluminum source of aluminum nitrate by adopting a homogeneous precipitation method. The preparation method is simple, the raw materials are low-cost and easily obtainable, and the prepared catalyst is used in a methanol dehydration reaction for generating dimethyl ether and has higher activity and stability at a lower temperature of 250-310 DEG C.

Description

technical field [0001] The invention relates to a core-shell structure Al for methanol dehydration to dimethyl ether 2 o 3 -SiO 2 Preparation method of solid acid catalyst. Background technique [0002] Dimethyl ether (molecular formula: CH 3 OCH 3 , Molecular weight: 46) It can be used as insecticide, polishing agent, antirust agent, alkylating agent, solvent, and can also be used as aerosol, hair spray, air freshener, civil fuel, etc. Due to the high cetane number (55-60) of dimethyl ether, good combustion performance, and low exhaust pollution during combustion, dimethyl ether has outstanding advantages as an alternative fuel for diesel engines. At the same time, dimethyl ether is also a very good environment-friendly refrigerant. Compared with traditional chlorofluorocarbons, it does not damage the ozone layer and has a small greenhouse effect coefficient. Therefore, DME is known as the clean energy of the 21st century. [0003] At present, there are two main proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/12C07C43/04C07C41/09
Inventor 聂仁峰王军华侯昭胤费金华郑小明
Owner ZHEJIANG UNIV
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