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Carbon dioxide and water processing methane catalyst and preparation method and application thereof

A carbon dioxide and catalyst technology, which is applied in the new catalytic process and preparation field of thermocatalytic carbon dioxide and water to methane, can solve the problems of complex catalyst preparation process, low photocatalytic quantum yield, and limited industrial scale-up application, and is easy to promote , Extensive sources of raw materials and low cost

Active Publication Date: 2018-04-10
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low quantum yield of photocatalysis, the catalytic efficiency is not high; electrocatalysis needs to overcome CO under the condition of an external electric field. 2 / CO 2 - The high oxidation-reduction potential of these two types of catalysts is carried out, and the preparation process of these two types of catalysts is complicated, the cost is high, and the industrial scale-up application is slim

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 2.0 g Ni(NO 3 ) 2 ·6H 2 O was dissolved in distilled water, followed by the addition of 18g Al 2 o 3 , impregnated for 12 hours under magnetic stirring. Then put it in a blast drying oven at 120 o C dried for 10 h, then placed in a muffle furnace at 500 o C roasting for 4 h, then in H 2 Atmosphere 450 o 2.5 wt. % Ni / Al was obtained after C reduction treatment for 5 h 2 o 3 catalyst. Physically mix the catalyst with metal Fe powder at a mass ratio of 1:2, press into tablets, crush, and sieve to obtain 40-60 mesh catalyst particles.

[0024] The catalyst particles were placed in a fixed-bed reactor at a space velocity of 300 h -1 , water volume 0.03 mL / min, 300°C, 2 MPa reaction conditions for activity evaluation, the result: CO 2 The conversion rate (C-mol %) is 3.5; CH 4 The selectivity (C-mol%) was 94.6.

Embodiment 2

[0026] Weigh 4.0 g Ni(NO 3 ) 2 ·6H 2 O was dissolved in distilled water, and 9 g of TiO was added 2 , impregnated for 12 hours under magnetic stirring. Then put it in a blast drying oven at 120 o C dried for 10 h, then placed in a muffle furnace at 500 o C roasting for 4 h, then in H 2 Atmosphere 450 o 10 wt. % Ni / TiO was obtained after C reduction treatment for 5 h 2 catalyst. Physically mix the catalyst and metal Mn powder at a mass ratio of 1:3, press into tablets, crush, and sieve to obtain catalyst particles of 40-60 mesh.

[0027] The catalyst particles were placed in a fixed-bed reactor at a space velocity of 600 h -1 , water volume 0.05 mL / min, 400°C, 3 MPa reaction conditions for activity evaluation, the result: CO 2 The conversion rate (C-mol %) is 7.8; CH 4 The selectivity (C-mol%) was 86.4.

Embodiment 3

[0029] Weigh 4.0 g Ni(NO 3 ) 2 ·6H 2 O was dissolved in distilled water, and 9 g of ZrO 2 , impregnated for 12 hours under magnetic stirring. Then put it in a blast drying oven at 120 o C dried for 10 h, then placed in a muffle furnace at 500 o C roasting for 4 h, then in H 2 Atmosphere 450 o 10 wt. % Ni / ZrO was obtained after C reduction treatment for 5 h 2 catalyst. The catalyst is physically mixed with the metal Al powder at a mass ratio of 1:1, pressed into tablets, crushed, and sieved to obtain 40-60 mesh catalyst particles.

[0030] The catalyst particles were placed in a fixed-bed reactor at a space velocity of 1200 h -1 , water volume 0.07 mL / min, 500°C, 4 MPa reaction conditions for activity evaluation, the result: CO 2 The conversion rate (C-mol %) is 9.3; CH 4 The selectivity (C-mol%) was 80.5.

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Abstract

The invention discloses a carbon dioxide and water processing methane catalyst and a preparation method and application thereof, and belongs to the technical field of chemical engineering. The catalyst is mainly prepared from metal simple substances and a supported nickel-based catalyst. The metal simple substances include Zn, Fe, Al, Mn, Ni, Co and Mg; the nickel-based catalyst is Ni / C, wherein Cis a carrier including Al2O3, SiO2, TiO2, ZrO2, CeO2 and La2O3. The total weight of the catalyst is adopted as the reference, the mass percent of the metal simple substances is 20-90%, and the mass percent of the nickel-based catalyst is 10-80%. According to the preparation process of the catalyst, dipping is adopted, sol-gel is adopted, a sediment or sedimentation method is adopted, and then drying, roasting and reducing are performed to obtain the catalyst. The reaction raw materials are carbon dioxide and water, sources are wide, the price is low, the catalyst preparation method is simple,easy to implement and low in cost, and the catalyst has the certain application prospect. The catalyst is mainly applied to thermo-catalysis instead of photo-catalysis or electro-catalysis.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to the conversion of carbon dioxide to methane, and specifically provides a new catalytic process for thermally catalyzing carbon dioxide and water to methane in a fixed-bed reactor, as well as its preparation method and application. technical background [0002] CO 2 is a major greenhouse gas, in recent years, with the CO 2 The increase in emissions and the intensification of global warming have aroused great attention from governments of all countries. To reduce CO 2 How to limit the concentration of CO in the atmosphere 2 Excessive emissions are one aspect. On the other hand, how to convert it quickly is also particularly important, so how to realize CO 2 The effective use of the technology has attracted the attention of more and more researchers. [0003] Methane is a high-quality, safe, efficient and clean hydrocarbon resource. In recent years, with the accelerat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J23/889B01J23/80B01J23/83B01J37/02B01J37/08B01J37/18C07C9/04C07C1/02
CPCB01J23/002B01J23/755B01J23/80B01J23/83B01J23/8892B01J37/0201B01J37/088B01J37/18C07C1/02C07C2523/755C07C2523/80C07C2523/83C07C2523/889C07C9/04
Inventor 刘勇军邓旋黄伟
Owner TAIYUAN UNIV OF TECH
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