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Hierarchical-hole molecular sieve catalyst for preparation of ethylene through dehydration of low-concentration ethanol, and preparation method and application thereof

A low-concentration ethanol and molecular sieve technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as loss of energy-consuming active components, poor catalyst stability, and increased reaction temperature. Improve the effect of strong surface acidity and uneven distribution, excellent catalytic performance, and smooth pore size distribution

Inactive Publication Date: 2017-03-29
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention is mainly aimed at the present modified HZSM-5 molecular sieve applied to the reaction of ethanol dehydration to ethylene, the existing molecular sieve modified by metal and / or non-metallic active components, the reaction temperature is obviously increased, the energy consumption is increased and in the actual application process The active components in the medium are easy to lose, which leads to technical problems such as poor stability of the catalyst and reduced reactivity, and provides a catalyst with high catalytic activity, good selectivity, good stability, and can be applied to the reaction of low-concentration ethanol dehydration to ethylene. Hierarchical modified molecular sieve catalyst with higher ethanol conversion and ethylene yield at lower reaction temperature

Method used

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  • Hierarchical-hole molecular sieve catalyst for preparation of ethylene through dehydration of low-concentration ethanol, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 6g of commodity HZSM-5 molecular sieve (SiO 2 / Al 2 o 3 molar ratio = 38) was added to 180 ml of 0.1 mol / L NaOH solution, stirred at a constant temperature of 65 °C for 1 h, cooled rapidly to room temperature, filtered, and washed with deionized water until the filtrate was neutral. After the filter cake was dried at 120°C for 12 hours, the obtained sample was placed in 0.05mol / L nitric acid solution, stirred at 90°C for 24 hours, cooled and filtered, washed until neutral, the filter cake was dried at 120°C, and then calcined at 500°C for 2 hours. The obtained samples were ion-exchanged with 0.8 mol / L ammonium nitrate at a solid-to-liquid ratio of 1:50 at 70°C for 3 times, each time for 2 h, and the filter cake was fully dried at 100°C, then calcined at 550°C for 4 hours, and naturally After cooling, crushing and sieving to a particle size of 20-40 meshes, the hierarchically porous modified HZSM-5 molecular sieve catalyst A can be obtained. After testing, the mesopor...

Embodiment 2

[0027] Add 6g of HZSM-5 (SiO2 / Al2O3=38) molecular sieve into 180 ml of 0.2 mol / L NaOH solution, stir at a constant temperature of 35°C for 1h, rapidly cool to room temperature, filter, and wash with deionized water until the filtrate is neutral . After the filter cake was dried at 120°C, the resulting sample was placed in 0.05mol / L nitric acid solution, stirred at 50°C for 24 hours, quenched and filtered, washed until neutral, the filter cake was dried at 100°C, and roasted at 500°C for 2 hours. The obtained samples were ion-exchanged with 0.8 mol / L ammonium nitrate at a solid-to-liquid ratio of 1:50 at 70°C for 3 times, each time for 2 h, and the filter cake was fully dried at 100°C, then calcined at 550°C for 4 hours, and naturally Cooling, crushing and sieving to a particle size of 20-40 meshes, the hierarchically porous modified HZSM-5 molecular sieve catalyst B can be obtained. After testing, the mesopore volume of catalyst B accounts for 69.2% of the total volume, the m...

Embodiment 3

[0030] 6g HZSM-5 (SiO 2 / Al 2 o 3 =38) Molecular sieves were added to 180 ml of 0.4 mol / L NaOH solution, stirred at a constant temperature of 35 °C for 1 h, cooled rapidly to room temperature, filtered, and washed with deionized water until the filtrate was neutral. After the filter cake was dried at 120°C, the resulting sample was placed in 0.05mol / L nitric acid solution, stirred at 50°C for 24 hours, quenched and filtered, washed until neutral, the filter cake was dried at 100°C, and roasted at 500°C for 2 hours. The obtained samples were ion-exchanged with 0.8 mol / L ammonium nitrate at a solid-to-liquid ratio of 1:50 at 70°C for 3 times, each time for 2 h, and the filter cake was fully dried at 100°C, then calcined at 550°C for 4 hours, and naturally Cooling, crushing and sieving to a particle size of 20-40 meshes, the hierarchically porous modified HZSM-5 molecular sieve catalyst C can be obtained. After testing, the volume of mesopores in catalyst C accounted for 42.1%...

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Abstract

The invention relates to a hierarchical-hole HZSM-5 catalyst suitable for a reaction for preparation of ethylene through dehydration of low-concentration ethanol, and is used for mainly solving the problems of low catalyst activity, poor catalyst stability, easy loss of active metals and the like existing in the prior art. The invention also relates to preparation of the modified catalyst and an application of the modified catalyst in the reaction for preparation of ethylene through dehydration of low-concentration ethanol. The molecular sieve catalyst can convert ethanol into ethylene with high conversion rate and high selectivity, and has the advantages of high activity at low temperature, good stability, high selectivity of ethylene, long catalytic life and the like.

Description

technical field [0001] The invention belongs to the field of preparation of catalysts for ethanol dehydration to ethylene, in particular to a mesoporous and hierarchically porous modified molecular sieve catalyst suitable for ethanol dehydration to ethylene, a preparation method thereof, and the use of the catalyst in the reaction of low-concentration ethanol dehydration to ethylene Applications. Background technique [0002] Ethylene is an important basic chemical raw material. At present, its industrial production mainly comes from the pyrolysis of petroleum. However, as we all know, this method not only produces a large amount of greenhouse gases and wastes and causes environmental degradation while providing chemical raw material ethylene, but also uses non-renewable fossil resources as raw materials. With the shortage of global oil resources and the deterioration of environmental conditions, this technology is becoming less and less competitive. As a green and sustain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C1/24C07C11/04
CPCC07C1/24B01J29/40B01J2229/37B01J2229/38B01J2229/14B01J35/64B01J35/615C07C11/04Y02P20/52
Inventor 盛清涛牛艳霞刘刚王玉高申峻
Owner TAIYUAN UNIV OF TECH
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