Catalyst for methanation of carbon dioxide

A methanation catalyst, carbon dioxide technology, applied to the field of carbon monoxide methanation catalyst, improved carbon dioxide, carbon dioxide hydrogenation to obtain methane or removal of trace carbon oxides from hydrogen, can solve the problem of insufficient reaction space velocity, low air yield, Alkylation activity is not enough to achieve the effect of good stable structure and thermal stability, easy to scale up production

Inactive Publication Date: 2011-06-15
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it can also be seen that these catalysts still have some defects, such as: (1) the methanation activity is not enough to reach the optimum state for the complete conversion of carbon oxides; (2) the reaction space velocity is not high enough, and the methane space-time yield (3) There is still room for improvement in structural stability of supported nickel catalysts and supports, etc.

Method used

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  • Catalyst for methanation of carbon dioxide
  • Catalyst for methanation of carbon dioxide
  • Catalyst for methanation of carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 10.8 g of lanthanum nitrate hexahydrate and 8.8 g of ferric nitrate nonahydrate were dissolved in 100 ml of distilled water (referred to as solution I), and 6.1 g of sodium hydroxide was dissolved in 100 ml of distilled water (referred to as solution II). Take another 100ml of distilled water in a beaker, heat up to 50°C, add solution I and II dropwise while stirring, and keep the pH of the solution at 7-8. After the dropwise addition, continue stirring for 5 hours, filter, and wash with deionized water until sodium-free ion. After the precipitate was dried at 110-120 for 5 hours, it was calcined at 650°C for 4 hours to obtain a dark red carrier (denoted as L 1 ). The carrier was analyzed by XRD to be a perovskite structure with a specific surface area of ​​78 square meters per gram.

Embodiment 2

[0044] 10.8 g of lanthanum nitrate hexahydrate and 7.3 g of cobalt nitrate hexahydrate were dissolved in 100 ml of distilled water (referred to as solution I), and 8.5 g of sodium hydroxide was dissolved in 100 ml of distilled water (referred to as solution II). Take another 100ml of distilled water in a beaker, raise the temperature to 70°C, add solutions I and II dropwise while stirring, and keep the pH of the solution at 9-10. After the dropwise addition, continue to stir for 5 hours, filter and wash with deionized water until sodium-free ion. After the precipitate was dried at 110-120 for 5 hours, it was roasted at 700°C for 4 hours to obtain the carrier (denoted as L 2 ). The carrier was analyzed by XRD as a perovskite structure with a specific surface area of ​​65 square meters per gram.

Embodiment 3

[0046] 22 grams of zinc acetate dihydrate, 75 grams of aluminum nitrate nonahydrate and 36 grams of urea were mixed and ground evenly, dried at 180°C for 12 hours, and roasted at 550°C for 5 hours to obtain a light yellow powder carrier (referred to as L 3 ), which is a spinel structure by XRD analysis.

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Abstract

The invention discloses a catalyst for the methanation of carbon dioxide. The carrier of the catalyst is composite oxide of rare earth and other metals, and the composition of the catalyst is represented by a general formula of AxByOz, wherein in the formula, A is a rare metal, B is one or two metals from groups IIB, IIIA, VIA, IVB, VB and VIB, x is 0 to 1, y is 0 to 2, and z is 2 to 4; and the active component of the catalyst is nickel, and the nickel loaded on the carrier accounts for 1 to 15 percent of the total weight of the catalyst. Compared with the conventional carbon dioxide methanation technique, the catalyst technique disclosed by the invention, under the similar reaction conditions, can achieve a carbon dioxide conversion rate of 100 percent, a methane selectivity of 100 percent and a methane time space yield of more than 1,000g/kg.h.

Description

technical field [0001] The invention relates to a method for eliminating carbon oxides, in particular to an improved carbon dioxide and carbon monoxide methanation catalyst, which is especially suitable for the process of hydrogenating carbon dioxide to obtain methane or removing trace carbon oxides from hydrogen. Background technique [0002] Hydrogen is an indispensable and important raw material for refining and chemical enterprises to increase the depth of crude oil processing, produce clean fuels and synthetic ammonia, and is also a raw material for many fine chemical production processes. At present, the steam reforming method using hydrocarbons as raw materials is the most widely used and most efficient basic industrial hydrogen production method. The process is as follows: the hydrocarbon raw material is purified, mixed with steam, mixed and preheated, and then enters the temperature-variable conversion catalyst bed at 500°C to 850°C to generate water vapor (and CO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/80C07C9/04C07C1/12C01B3/58
Inventor 宋焕玲丑凌军杨建赵军
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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