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A kind of preparation method of synthetic gas methanation to produce natural gas catalyst

A catalyst and natural gas technology, which is applied in the field of preparation of supported molybdenum-based catalysts for synthesis gas methanation to natural gas, can solve the problems of increased catalyst preparation costs, little contribution to the target reaction of catalysts, low metal utilization rate of carrier channels, etc., to achieve improved Conversion rate and product selectivity, avoiding further conversion, and accelerating the effect of adsorption and desorption speed

Active Publication Date: 2018-01-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the catalysts prepared by the above-mentioned patented methods have obtained better synthesis gas methanation reaction performance, because the reaction is a fast reaction (this kind of fast reaction is generally carried out under the condition of mass transfer control), the reactants in The reaction is completed when it reaches the outer surface of the catalyst, so the inner surface of the catalyst does not contribute much to the target reaction, which results in lower metal utilization in the carrier pores and increases the preparation cost of the catalyst

Method used

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  • A kind of preparation method of synthetic gas methanation to produce natural gas catalyst
  • A kind of preparation method of synthetic gas methanation to produce natural gas catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0028]Weigh 1.84g of ammonium molybdate and 1.98g of nickel nitrate and dissolve them in an appropriate amount of deionized water to obtain solution A; adopt the equal volume impregnation method to load on 20g of alumina (the pore volume is 0.72ml / g, the specific surface area is 242m 2 / g, strip shape, equivalent diameter 1.5mm) carrier, aged at room temperature for 4h, dried at 80°C for 12h, and calcined at 500°C for 4h to obtain catalyst precursor B, in which Mo accounted for 5% of the weight of the carrier by element, and Ni by element Accounting for 2% of the weight of the carrier; catalyst precursor B is activated in a mixed atmosphere containing hydrogen, the volume content of hydrogen in the mixed gas is 80%, the reduction condition is 450 ° C, 0.2 MPa (absolute pressure), and the reduction time is 4 hours; after the reduction activation The catalyst precursor B and 300mL of sorbitol solution with a mass concentration of 10% were added to the autoclave, sealed and replac...

Embodiment 2

[0030] Weigh 1.84g of ammonium molybdate and 1.98g of nickel nitrate and dissolve them in an appropriate amount of deionized water to obtain solution A; use an equal volume impregnation method to load 20g of hydrogen ZSM-5 (silicon-aluminum ratio 50, pore volume 0.23ml / g, The specific surface area is 426m 2 / g, strip shape, equivalent diameter 1.5mm) carrier, aged at room temperature for 6h, dried at 110°C for 10h, and calcined at 600°C for 4h to obtain catalyst precursor B, in which Mo accounted for 5% of the weight of the carrier by element, and Ni by element Accounting for 2% of the weight of the carrier; catalyst precursor B is activated in a mixed atmosphere containing hydrogen, the volume content of hydrogen in the mixed gas is 90%, the reduction condition is 400 ° C, 0.2 MPa (absolute pressure), and the reduction time is 8 hours; after the reduction and activation The catalyst precursor B and 300mL of sorbitol solution with a mass concentration of 10% were added to the ...

Embodiment 3

[0032] Weigh 1.84g of ammonium molybdate and 1.98g of nickel nitrate and dissolve them in an appropriate amount of deionized water to obtain solution A; use equal volume impregnation method to load 20g of silicon oxide (pore volume is 1.06ml / g, specific surface area is 387m 2 / g, spherical, equivalent diameter 0.5mm) carrier, aging at room temperature for 8h, drying at 120°C for 6h, and calcining at 600°C for 4h to obtain catalyst precursor B, in which Mo accounts for 5% of the weight of the support as an element, and Ni accounts for The weight of the carrier is 2%; the catalyst precursor B is activated in a mixed atmosphere containing hydrogen, the volume content of hydrogen in the mixed gas is 10%, the reduction condition is 500°C, 0.2MPa (absolute pressure), and the reduction time is 6h; the activated Catalyst precursor B and 300mL sorbitol solution with a mass concentration of 10% were added to the autoclave, sealed and replaced with hydrogen twice, then adjusted the hydrog...

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Abstract

The invention relates to a preparation method of a catalyst for synthetic gas methanation to natural gas. The catalyst comprises an active ingredient, a first additive, a second additive and a carrier. The preparation method is as below: dissolving an active ingredient precursor and a first additive precursor into water to obtain a solution A; adding the carrier, ageing, drying and calcining to obtain a catalyst precursor B; reducing the catalyst precursor B in a reducing atmosphere; adding the reduced catalyst precursor B and a polyol solution into a reactor, and carrying out a hydrogenation reaction; placing a reaction effluent, filtering and dying to obtain a catalyst precursor C; and dissolving an active ingredient precursor and a second additive precursor in water to obtain a solution D, then adding the catalyst precursor C, drying and calcining to obtain the catalyst. The method of the present invention promotes dispersion of more active ingredients on the surface of the carrier, improves the utilization of the active metal, as well as improves the conversion of carbon monoxide and the selectivity of products.

Description

technical field [0001] The invention relates to a preparation method of a synthesis gas methanation to natural gas catalyst, in particular to a preparation method of synthesis gas methanation to natural gas supported molybdenum-based catalyst. Background technique [0002] Methanation refers to CO / CO 2 with H 2 Under certain temperature, pressure and catalyst action, generate CH 4 At present, this reaction is widely used in the removal of trace carbon in the synthesis of ammonia or hydrogen production, methanation of coke oven gas, and coal-to-natural gas. Methanation is an important catalytic technology, especially in fuel applications, where it can be used to increase the calorific value of gas, allowing the conversion of coke oven gas, coal or biomass to natural gas. In recent years, with the rapid development of my country's coal-based natural gas industry, methanation, one of the core technologies, has received more and more attention. [0003] China is a country ri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/887B01J29/48B01J23/883C07C9/04C07C1/04
CPCY02P20/50
Inventor 孙晓丹张舒冬张信伟刘继华
Owner CHINA PETROLEUM & CHEM CORP
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