Core-shell structured Beta molecular sieve and preparation method thereof

A core-shell structure and molecular sieve technology, applied in molecular sieve catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve problems such as weak ethanol conversion ability, limited catalytic performance, poor selectivity, etc., to achieve efficient utilization and high ethanol Conversion, hydrogen selectivity, and effect of selectivity reduction

Active Publication Date: 2015-11-04
TAIYUAN DACHENG ENVIRONMENTAL ENERGY CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ni has a strong ability to break C-C bonds, but for H 2 Poor selectivity; Cu has a good ability to break O-H bonds, H 2 The yield is very low; Fe has good catalytic performance, but the conversion ability for ethanol is weak
So far, the number of patents and documents on the applica...

Method used

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  • Core-shell structured Beta molecular sieve and preparation method thereof
  • Core-shell structured Beta molecular sieve and preparation method thereof
  • Core-shell structured Beta molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 2 mL of deionized water, 37.2 mL of tetraethylammonium hydroxide, and 21.95 mL of silica sol into a polytetrafluoroethylene container, heat to 40°C and stir for 3 hours to form a transparent mixed solution, and add hydrogen dropwise at a rate of 0.1 mL / min Fluoric acid 2.88mL, stirred for 1h, formed a white colloidal mixed solution.

[0030] Put the polytetrafluoroethylene container containing the white colloidal mixed solution into a stainless steel reaction kettle, seal it, place it in a constant temperature box, and heat it to 140°C for static crystallization for 168 hours; take out the reaction kettle and place it in a quenching tank at 10°C The deionized water was rapidly cooled to 20°C; the crystallized gel solution was centrifuged at 8000r / min for 20min, the solid precipitate was retained, placed in a vacuum drying oven, and dried at 100°C for 12h to obtain a white solid product.

[0031] Put the vacuum-dried white solid product in a roasting furnace and roa...

Embodiment 2

[0046] Take 2 mL of deionized water, 37.2 mL of tetraethylammonium hydroxide, and 21.95 mL of silica sol into a polytetrafluoroethylene container, heat to 40°C and stir for 3 hours to form a transparent mixed solution, and add hydrogen dropwise at a rate of 0.1 mL / min Fluoric acid 2.88mL, stirred for 1h, formed a white colloidal mixed solution.

[0047] Put the polytetrafluoroethylene container containing the white colloidal mixed solution into a stainless steel reaction kettle, seal it, place it in a constant temperature box, and heat it to 140°C for static crystallization for 168 hours; take out the reaction kettle and place it in a quenching tank at 10°C The deionized water was rapidly cooled to 20°C; the crystallized gel solution was centrifuged at 8000r / min for 20min, the solid precipitate was retained, placed in a vacuum drying oven, and dried at 100°C for 12h to obtain a white solid.

[0048] Put the vacuum-dried white solid product in a roasting furnace and roast at 55...

Embodiment 3

[0060] Take 3.1mL of deionized water, 40.2mL of tetraethylammonium hydroxide, and 23.3mL of silica sol into a polytetrafluoroethylene container, heat to 40°C and stir for 3 hours to form a transparent mixed solution, and add dropwise at a rate of 0.1mL / min Hydrofluoric acid 2.88mL, stirred for 1h, formed a white colloidal mixed solution.

[0061] Put the polytetrafluoroethylene container containing the white colloidal mixed solution into a stainless steel reaction kettle, seal it, place it in a constant temperature box and heat it to 160°C, and statically crystallize it for 200h; take out the reaction kettle and place it in a quenching tank at 10°C The deionized water was rapidly cooled to 20°C; the crystallized gel solution was centrifuged at 8000r / min for 20min, the solid precipitate was retained, placed in a vacuum drying oven, and dried at 100°C for 12h to obtain a white solid.

[0062] The vacuum-dried white solid product was placed in a roasting furnace, and roasted at 6...

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Abstract

A core-shell structured Beta molecular sieve comprises 70-75wt% of an inner layer Beta molecular sieve core structure and 25-30wt% of an outer layer Beta molecular sieve shell structure wrapped outside the surface of the core structure, total silicon Beta molecular sieve is adopted as the carrier of the inner layer Beta molecular sieve to support copper and/or iron oxide, the copper and/or iron oxide accounts for 3-8% of the mass of the total silicon Beta molecular sieve, the surface of the inner layer Beta molecular sieve is connected with a poly(diallyldimethylammonium chloride) group, and 10-15% of nickel oxide is supported on the outer layer Beta molecular sieve. The core-shell structured Beta molecular sieve utilizing synergism of inner and outer double-layer molecular sieves and supported metal elements has high catalysis activity, and has the advantages of great improvement of the selectivity of a target product hydrogen, and very high ethanol conversion rate and hydrogen selectivity as an ethanol steam reforming hydrogen production catalyst.

Description

technical field [0001] The invention relates to a Beta molecular sieve, in particular to a Beta molecular sieve with a core-shell structure and a preparation method for the Beta molecular sieve. The core-shell structure of the Beta molecular sieve of the present invention is loaded with different metal active components, and can be used as a catalyst for catalytic hydrogen production. Background technique [0002] Since the 21st century, people's demand for energy has been increasing, and the development of new renewable energy and clean energy has become an inevitable trend in future energy development. Among the many renewable energy sources, hydrogen energy is considered as one of the most potential clean alternative energy sources. [0003] At present, hydrogen is mainly produced by steam reforming of methane and electrolysis of water. The reaction process is accompanied by the generation of a large amount of carbon dioxide, which exceeds the balance limit of the enviro...

Claims

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Application Information

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IPC IPC(8): B01J29/76B01J35/02B01J37/10C01B39/04C01B3/32
Inventor 郑子良谢鲜梅杨冬花代蓉王诗瑶
Owner TAIYUAN DACHENG ENVIRONMENTAL ENERGY CHEM TECH
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