Dual-function catalyst for directly preparing dimethyl ether from synthesis gas and preparation method of dual-function catalyst

A bifunctional catalyst and catalyst technology, which is applied in the fields of dehydration of hydroxyl-containing compounds to prepare ether, chemical instruments and methods, catalysts for physical/chemical processes, etc. Guaranteed selective effect

Inactive Publication Date: 2013-07-24
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the presence of the template agent TPAOH in the process of synthesizing zeolite HZSM-5, the structure of the methanol synthesis catalyst was destroyed, resulting in a decrease in the reactivity.

Method used

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  • Dual-function catalyst for directly preparing dimethyl ether from synthesis gas and preparation method of dual-function catalyst
  • Dual-function catalyst for directly preparing dimethyl ether from synthesis gas and preparation method of dual-function catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0019] CuO-ZnO-Al was first prepared by co-current co-precipitation method 2 o 3 catalyst. The nitrate solution of copper, zinc and aluminum with a total concentration of 1mol / L (molar ratio of copper:zinc:aluminum=6:3:1) was mixed with 1mol / L Na 2 CO 3 The solution was poured into the three-necked flask concurrently under stirring, and precipitated at 80°C, pH=7.0, then aged and washed, washed with distilled water until neutral, dried in an oven at 120°C overnight, and roasted at 350°C After 5 hours, a methanol synthesis catalyst was prepared, and the methanol synthesis catalyst was pressed into pellets with a diameter of 20-40 meshes for use.

[0020] Dissolve 2.0g of aluminum nitrate in 80mL of deionized water, then add 0.4mL of ethyl orthosilicate, stir until completely dissolved, add 2.0g of methanol synthesis catalyst particles into the aqueous solution of ethyl orthosilicate and aluminum nitrate, transfer to In a stainless steel reaction kettle, react at 120°C for 6...

Embodiment approach 2

[0024] Methanol Synthesis Catalyst CuO-ZnO-Al 2 o3 The synthetic method is the same as embodiment 1.

[0025] Dissolve 2.0g of aluminum nitrate in 80mL of deionized water, then add 0.1mL of ethyl orthosilicate, stir until completely dissolved, add 2.0g of methanol synthesis catalyst particles into the aqueous solution of ethyl orthosilicate and aluminum nitrate, transfer to In a stainless steel reaction kettle, react at 120°C for 12 hours under rotating conditions, and the obtained product is filtered, washed, and dried to obtain a bifunctional catalyst Cat-2 for directly preparing dimethyl ether from synthesis gas.

[0026] Bifunctional Catalyst-2 Surface SiO Catalyst for Direct Preparation of DME from Syngas 2 -Al 2 o 3 The shell thickness is 8 μm.

[0027] Catalyst evaluation conditions are the same as in Example 1, and the catalytic results obtained are shown in Table 1.

Embodiment approach 3

[0029] Methanol Synthesis Catalyst CuO-ZnO-Al 2 o 3 The synthetic method is the same as embodiment 1.

[0030] Dissolve 2.0g of aluminum nitrate in 80mL of deionized water, then add 0.2mL of ethyl orthosilicate, stir until completely dissolved, add 2.0g of methanol synthesis catalyst particles into the aqueous solution of ethyl orthosilicate and aluminum nitrate, transfer to In a stainless steel reaction kettle, react at 80°C for 24 hours under rotating conditions, and the obtained product is filtered, washed, and dried to obtain a bifunctional catalyst Cat-3 for directly preparing dimethyl ether from synthesis gas.

[0031] Bifunctional Catalyst-3 Surface SiO Catalyst for Direct Preparation of Dimethyl Ether from Syngas 2 -Al 2 o 3 The shell thickness is 11 μm.

[0032] Catalyst evaluation conditions are the same as Embodiment 1, and the catalytic results obtained are shown in Table 1.

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Abstract

The invention discloses a dual-function catalyst for directly preparing dimethyl ether from synthesis gas and preparation method of the dual-function catalyst, and belongs to the research and preparation field of catalyst. The catalyst is characterized by the dual-function catalyst with a core-shell structure for directly preparing dimethyl ether from synthesis gas and the preparation method of the dual-function catalyst. The method comprises the following steps: using methanol synthesis catalyst as core, and tetraethoxysilane, sodium silicate or silica sol as the silicon source, and using aluminum nitrate as aluminum source, coating a layer of SiO2-Al2O3 shell layer on the surface of the methanol synthesis catalyst so as to obtain the dual-function catalyst with core-shell structure. The dual-function catalyst prepared by the invention is mild in synthesis system condition, and the synthesis system is free from any acid, alkali or organic template, the preparation method of the dual-function catalyst for directly preparing dimethyl ether from synthesis gas is environment-friendly and low in cost.

Description

technical field [0001] The invention discloses a bifunctional catalyst for directly preparing dimethyl ether from synthesis gas and a preparation method thereof, and belongs to the field of catalyst research and preparation, and in particular relates to a bifunctional catalyst with a core-shell structure and a method for directly preparing dimethyl ether from synthesis gas. The technical scheme of its preparation method. Background technique [0002] The direct production of dimethyl ether (DME) from syngas refers to the 2 The synthesis gas of the gas enters the synthesis reactor, and the two reaction processes of methanol synthesis and methanol dehydration are simultaneously completed in the reactor, thereby directly synthesizing dimethyl ether. The main advantage of the direct production of DME from synthesis gas is that it breaks the chemical equilibrium limitation of synthesis gas in the production of methanol, makes the reaction proceed in a direction that is conducive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80C07C43/04C07C41/09
Inventor 李瑞丰王琰范彬彬郑家军马静红王文丽陈月仙
Owner TAIYUAN UNIV OF TECH
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