Sulfur-tolerant catalyst for synthesized gas methanation and preparation method and application of sulfur-tolerant catalyst

A catalyst and gas methane technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, gas fuels, etc., can solve the problems of small specific surface of cerium oxide, complex preparation process, sublimation of active components, etc., and achieve active site density Large, high content, the effect of increasing the effective content

Inactive Publication Date: 2016-05-25
SEDIN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It supports molybdenum oxide on cerium oxide for methanation, but the specific surface of cerium oxide is small and expensive, and is generally used as the second component to improve the performance of the catalyst; patent CN103191720A discloses a magnesium-aluminum spinel-supported A preparation method of a sulfur-resistant methanation catalyst, which prepares a magnesium-aluminum spinel carrier by coprecipitation, deposition precipitation, impregnation, kneading or sol-gel method, with Mo as the active component, but its reaction The temperature is 650°C, and the higher reaction temperature is likely to cause the sublimation of the active components and deactivate the catalyst
[0006] The above-mentioned patent improves the performance and stability of the catalyst by adding Mo as the second component, optimizing the carrier and optimizing the preparation method, but the preparation process is relatively complicated

Method used

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  • Sulfur-tolerant catalyst for synthesized gas methanation and preparation method and application of sulfur-tolerant catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation of Mo-Al alloy powder: mix 5.8g of molybdenum powder with particle size of 3-6μm, 4.1g of aluminum powder of 4-6μm and 0.1g of iron metal powder of 4-6μm; Molten, and with 1*10 6 k / s was cooled to room temperature under nitrogen protection, and ground to 90 mesh for later use;

[0022] (2) The vulcanization process of the catalyst: the alloy powder prepared in (1) has a volume composition of 3% H 2 / 97%H 2 Vulcanized at 350°C for 5 hours in an atmosphere of S;

[0023] (3) Preparation of sulfur-resistant catalyst: mix the catalyst precursor prepared in (2) with solid sodium hydroxide, the mass ratio of sodium hydroxide to alloy powder is 1:1; distilled water whose volume is 3 times that of alloy powder is dropped dropwise Add dropwise to the mixture and stir magnetically at 80 / min; at the same time, place it in a water bath, control the temperature of the water bath to 0°C; after the addition, the suspension is ultrasonicated at 50kHz, 60°C for 30min,...

Embodiment 2

[0026] (1) Preparation of Mo-Al alloy powder: mix 5.6g of molybdenum powder with particle size of 3-6μm, 4.3g of aluminum powder of 4-6μm and 0.1g of nickel metal powder of 6-8μm; Molten, and with 1*10 6 k / s was cooled to room temperature under nitrogen protection, and ground to 100 mesh for later use;

[0027] (2) The vulcanization process of the catalyst: the alloy powder prepared in (1) has a volume composition of 5% H 2 / 95%H 2 Sulfurization at 450°C for 5 hours in an atmosphere of S;

[0028] (3) Preparation of sulfur-resistant catalyst: the catalyst precursor prepared in (2) is mixed with solid sodium hydroxide and the mass ratio of sodium hydroxide to alloy powder is 1.1:1; the volume is distilled water 3 times that of alloy powder Add dropwise to the mixture and stir magnetically at 90 / min; at the same time, place it in a water bath and control the temperature of the water bath to 3°C; after the addition, the suspension is ultrasonicated at 60kHz and 50°C for 30min ...

Embodiment 3

[0031](1) Preparation of Mo-Al alloy powder: Mix 5.4g of molybdenum powder with particle size of 6-9μm, 4.3g of aluminum powder of 8-10μm and 0.3g of cerium metal powder of 6-8μm; Melted, and with 1.2*10 6 k / s was cooled to room temperature under nitrogen protection, and ground to 100 mesh for later use;

[0032] (2) The vulcanization process of the catalyst: the alloy powder prepared in (1) has a volume composition of 7% H 2 / 93%H 2 Vulcanized at 450°C for 3 hours in an atmosphere of S;

[0033] (3) Preparation of sulfur-resistant catalyst: the catalyst precursor prepared in (2) is mixed with solid sodium hydroxide and the mass ratio of sodium hydroxide to alloy powder is 1.2:1; the volume is distilled water 4 times that of alloy powder Add dropwise to the mixture and stir magnetically at 100r / min; at the same time, place it in a water bath and control the temperature of the water bath to 5°C; after the addition, the suspension is ultrasonicated for 40min at 70kHz and 50°C...

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Abstract

The invention provides a sulfur-tolerant catalyst for synthesized gas methanation. The sulfur-tolerant catalyst is characterized by being prepared form 60-70 wt% of Mo, 23-35 wt% of S, 3-6 wt% of Al and 1-4.5 wt% of an auxiliary. The sulfur-tolerant catalyst has the advantages of being simple in preparation process, good in catalytic performance and high in methane selectivity.

Description

technical field [0001] The invention belongs to a preparation method and application of a synthesis gas methanation catalyst, in particular to a sulfur-resistant catalyst for synthesis gas methanation and its preparation method and application. Background technique [0002] As a low-carbon, high-efficiency, and clean energy, natural gas will account for an increasing proportion of primary energy consumption. my country's energy structure is rich in coal but less in gas, and the demand for natural gas has been increasing at a rate of 16% year by year since 2000, which has caused the gap between the supply and demand of natural gas in my country to expand year by year, and the dependence on foreign countries has increased rapidly. Actively developing coal-based natural gas can not only reduce the potential risks brought by the imported natural gas market to my country and meet the growing market demand, but also has strategic significance for my country's energy security, ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051C10L3/08
CPCB01J27/051B01J27/0515C10L3/08
Inventor 于智慧何晓鸥范力韩涛范辉
Owner SEDIN ENG
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