Novel composite solid acid catalyst and application

A composite solid acid and catalyst technology, applied in molecular sieve catalysts, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of increased energy consumption, unfavorable formation of branched chain isoparaffins, high reaction temperature, etc., and achieve good activity Effect

Inactive Publication Date: 2008-07-09
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] From the above studies, it can be seen that the reaction temperature of gasoline modified desulfurization with ZSM-5 as the active componen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Catalyst Synthesis

[0031]Weigh 1.5g of phosphotungstic acid (PW) and dissolve it in 20ml of deionized water. After ultrasonic oscillation for 10 minutes, 10 g of extruded nano-HZSM-5 was added. After standing still overnight, the mixture was dried at 100°C and calcined at 320°C for 3 hours to obtain the desired catalyst, which is abbreviated as Cat1.

[0032] According to the above preparation method, 1.5 g of phosphomolybdic acid (PMo) or 1.5 g of silicotungstic acid (SiW) is added, and the others are the same as above. Catalysts are abbreviated as Cat2 and Cat3 respectively.

Embodiment 2

[0034] Weigh 1.5g of phosphotungstic acid (PW) and dissolve it in 20ml of deionized water, then add Ni(NO 3 ) 2 ·6H 2 O 0.9 g formed a green solution. After ultrasonic oscillation for 10 minutes, 10 g of extruded nano-HZSM-5 was added. After standing still overnight, the mixture was dried at 100°C and calcined at 320°C for 3 hours to obtain the desired catalyst, which is abbreviated as Cat4.

Embodiment 3

[0036] Weigh 1.5g of phosphomolybdic acid (PMo) and dissolve it in 20ml of deionized water, then add Ni(NO 3 ) 2 ·6H 2 O 0.9g formed a yellow-green solution. After ultrasonic oscillation for 10 minutes, 10 g of extruded nano-HZSM-5 was added. After standing still overnight, the mixture was dried at 100°C and calcined at 320°C for 3 hours to obtain the desired catalyst, which is abbreviated as Cat5.

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PUM

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Abstract

The invention is to load heteropoly acid and transition metal oxide on nano HZSM-5 zeolite to form a composite solid acid catalyst. The composite solid acid catalyst is an effective catalyst for dimethyl ether prepared by methyl alcohol gas phase dehydration and through a synthesis gas one-step method and fuel modification and desulfuration. In the reaction of preparation of dimethyl ether by methyl alcohol gas phase dehydration, when the reaction temperature is lower than 200 DEG C, the mol conversion rate of the methyl alcohol is higher than 85 percent, and the mol selectivity of the dimethyl ether is higher than 99.5 percent. In the reaction of preparation of dimethyl ether through the synthesis gas one-step method, the conversion rate of the CO is higher than 80 percent, the selectivity of the dimethyl ether in the organic substance is higher than 50 percent, and the selectivity of the methyl alcohol is lower than 2 percent. In modification and desulfuration of the FCC oil products, the desulfurization rate is higher than 50 percent; meanwhile, the olefinic content of the oil products is reduced, which improves the content of isoalkane.

Description

technical field [0001] The invention relates to a preparation method of heteropolyacid / nano ZSM-5 composite solid acid catalyst and its application in gas-phase dehydration of methanol to produce dimethyl ether, synthesis gas to produce dimethyl ether in one step, and gasoline modification and desulfurization. Background technique [0002] All countries in the world are actively engaged in the development and application of dimethyl ether and its downstream products, therefore, the potential market of dimethyl ether is huge. DME can be used as an industrial fuel, and can be burnt alone or mixed with liquefied gas, alcohol, and hydrocarbons, and can also be mixed with city gas or natural gas to achieve clean combustion. DME can also replace chlorofluorocarbons as aerosols, refrigerants and blowing agents to reduce air pollution. [0003] Dimethyl ether was first produced by rectification of by-products in high-pressure methanol production, and soon developed into two process...

Claims

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Application Information

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IPC IPC(8): B01J29/48B01J29/46C07C43/04
Inventor 王祥生陈立东郭新闻刘民杨玉辉
Owner DALIAN UNIV OF TECH
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