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Preparation method of catalyst for preparing substitute natural gas from synthetic gas

A technology for replacing natural gas and catalyst, applied in the field of catalysis, can solve problems such as poor hydrothermal stability and unsuitability for use, and achieve the effects of preventing carbon deposition, inhibiting carbonylation reaction, and good hydrothermal stability

Inactive Publication Date: 2016-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carriers of these catalysts have poor hydrothermal stability and are not suitable for use in the reaction of coal-based synthesis gas to substitute natural gas.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: the preparation of catalyst

[0015] Weigh 600g of alumina monohydrate and conduct heat treatment at 120°C~300°C for 1h~3h; 2) Add 800g of magnesium soluble salt to the heat-treated alumina, add a certain amount of deionized water and knead for 0.5 h, mix well, dry at 100°C~140°C, and then roast at 350°C~550°C for 2~4h; 3) Crush the roasted material, add 24g cellulose and 500g deionized water, knead Put it aside for 24 hours after uniformity; 4) Granulate the uniformly kneaded material into particles with a particle size of about 1.2mm, and dry at 120°C for 3~5 hours; Honeycomb particles; 6) The tablet is calcined at 700°C~1200°C to obtain the catalyst carrier. 7) Prepare a solution containing one or more of nickel nitrate and lanthanum nitrate, potassium nitrate or potassium carbonate, cerium nitrate or cerous nitrate, and immerse the catalyst carrier prepared above into the solution; 8) After drying and roasting to produce a catalyst.

Embodiment 2

[0016] Example 2: Evaluation of Catalysts

[0017] The catalyst is packed in a fixed-bed tubular reactor, and the reaction conditions are: pressure 3.0MPa, H 2 / CO / CO 2 =10 / 2 / 1, gas space velocity is 5000~30000h -1 , the particle size of the catalyst is Φ5×5, the height of the catalyst bed is 20cm, the inlet temperature of the catalyst bed is 280°C, and the hot spot temperature of the catalyst bed is 650°C. First, the catalyst was reduced under hydrogen at 400°C for 8 hours, and the feed gas and water were preheated to a certain temperature and passed into the catalyst bed for reaction. After 2000 hours of reaction, the activity of the catalyst remained good, and the hot spot of the catalyst bed did not move down. Among them, the conversion rate of CO was 94%. The mechanical strength of the dismantled catalyst after the test was still high. There was no carbon deposition on the surface of the catalyst. The analysis results on the surface of the catalyst showed that no carbon...

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Abstract

The invention belongs to the technical field of catalysis, and relates to a preparation method of a catalyst for preparing substitute natural gas from synthetic gas. The preparation method comprises the following steps: mixing alumina (or pseudo-boehmite) with soluble salt of magnesium, adding ionized water, fully mixing above materials until uniformity, disposing the obtained mixture for a certain time, drying the disposed mixture, roasting the dried mixture, crushing the roasted mixture, adding a binder, granulating the obtained mixture, drying the granulated mixture, carrying out press molding, roasting the molded mixture to prepare a catalyst carrier, and loading an active component and an assistant to the carrier through an immersion technology to prepare the catalyst. The catalyst carrier prepared through the method has good hydrothermal stability and has a water absorption rate of 40-45%, and the catalyst prepared through adopting the catalyst carrier and used for preparing substitute natural gas from synthetic gas is suitable for a methanation reaction under a high CO content at a high reaction temperature, and can effectively prevent carbon deposition and inhibit a carbonylation reaction.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a preparation method of a catalyst for producing a substitute natural gas from synthesis gas. Background technique [0002] With the rapid development of the world economy, the rapid increase of population, the continuous growth of energy consumption, the surge of greenhouse gas and various harmful substances emissions, the human living environment has been greatly challenged. In this situation, clean, high calorific value natural gas energy is being paid more and more attention, and the development of natural gas industry has become the best choice for all countries in the world to improve the environment and promote sustainable economic development. The greenhouse gases produced by burning natural gas are only 1 / 2 of that of coal and 2 / 3 of that of oil, and the pollution to the environment is far less than that of oil and coal. my country is relatively rich in co...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J23/78
Inventor 蔡成伟魏士新蔡进檀结东陈长新吴学其张杰吴琳孟建朱艳芳黄先亮徐本刚
Owner CHINA PETROLEUM & CHEM CORP
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