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Preparation method of catalyst for syngas complete methanation to prepare natural gas

A complete methanation and catalyst technology, which is applied in the field of preparation of supported molybdenum-based catalysts, can solve problems such as waste catalyst pollution, achieve the effects of saving a lot of costs, improving conversion rate and product selectivity, and improving resource utilization

Active Publication Date: 2016-06-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method not only utilizes the Mo, Co and alumina supports in the spent hydrotreating catalyst, but also makes full use of the Ni and V deposited on the spent hydrotreating catalyst, which solves the pollution problem of spent catalysts, saves resources and improves benefits , is technically easy to implement, and the resulting synthesis gas methanation catalyst has the characteristics of low cost, high utilization rate of metal components, good selectivity, strong anti-coking ability and good stability

Method used

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  • Preparation method of catalyst for syngas complete methanation to prepare natural gas

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Effect test

Embodiment 1

[0035] The spent hydrotreating catalyst (MoCo / Al 2 o 3 ), the oil on the surface of the catalyst was removed by extraction, dried at 110°C for 8h, and the obtained catalyst was calcined at 450°C for 4h to obtain the spent catalyst after treatment (containing Mo: 12.8wt%, Co: 2.3wt%, V: 2.5wt% , Ni: 1.9wt%, Al 2 o 3 : 71.2wt%), grind the catalyst to 200 mesh (means passing through a 200 mesh sieve), weigh 100 grams of powder, add 260mL of 98wt% concentrated sulfuric acid, stir at 50°C to dissolve the solid, collect the filtrate by filtration, and pour Add 54.01g of nickel nitrate to the filtrate, stir and dissolve, then add 27.31g of citric acid (the molar ratio of citric acid to Mo in the waste agent is 1), add 142.13g of pseudo-boehmite after all dissolved, and stir at 70°C until The solution was evaporated to dryness, the resulting solid was dried at 100°C for 8h, and then calcined at 600°C for 4h to obtain the catalyst precursor A, wherein Mo accounted for 6wt% of the we...

Embodiment 2

[0037] The spent hydrotreating catalyst (MoCo / Al 2 o 3 ), the oil on the surface of the catalyst was removed by extraction, dried at 110°C for 8h, and the obtained catalyst was calcined at 450°C for 4h to obtain the spent catalyst after treatment (containing Mo: 12.8wt%, Co: 2.3wt%, V: 2.5wt% , Ni: 1.9wt%, Al 2 o 3 : 71.2wt%), grind the catalyst to 200 mesh (referring to passing through a 200 mesh sieve), weigh 100 grams of powder, add 300mL of a mixed solution of 98wt% concentrated sulfuric acid and 65wt% concentrated nitric acid, the volume ratio is 2:1, in Stir at a constant temperature at 50°C to dissolve the solid, collect the filtrate by filtration, add 41.32g of nickel nitrate to the filtrate, stir and dissolve, then add 40.98g of citric acid (the molar ratio of citric acid to Mo in the waste agent is 1.5), and after all the dissolution Add 24.87g of pseudo-boehmite, stir at 70°C until the solution is evaporated to dryness, dry the resulting solid at 100°C for 8 hour...

Embodiment 3

[0039] The spent hydrotreating catalyst (MoCo / Al 2 o 3 ), the oil on the surface of the catalyst was removed by extraction, dried at 110°C for 8h, and the obtained catalyst was calcined at 450°C for 4h to obtain the spent catalyst after treatment (containing Mo: 12.8wt%, Co: 2.3wt%, V: 2.5wt% , Ni: 1.9wt%, Al 2 o 3 : 71.2wt%), grind the catalyst to 200 mesh (referring to passing through a 200 mesh sieve), weigh 100 grams of powder, add 450mL of a mixed solution of 35wt% concentrated hydrochloric acid and 65wt% concentrated nitric acid, and the volume ratio is 1:1. Stir at a constant temperature at 50°C to dissolve the solid, collect the filtrate by filtration, add 54.01g of nickel nitrate to the filtrate, stir to dissolve, add 13.66g of citric acid (the molar ratio of citric acid to Mo in the waste agent is 0.5), and dissolve all Add 142.13 g of pseudo-boehmite, stir at 70°C until the solution is evaporated to dryness, dry the obtained solid at 100°C for 8 hours, and roast ...

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Abstract

The invention relates to a preparation method of a catalyst for syngas complete methanation to prepare natural gas. The catalyst comprises an active component, an auxiliary agent and a carrier. The preparation method comprises the following steps: preparing a catalyst precursor (A) by processing the catalyst for waste residual oil hydrogenation, then reducing the catalyst precursor (A) in a reducing atmosphere, adding the reduced catalyst precursor (A) and a polyol solution into a high pressure reactor to carry out hydrogenation reactions, collecting the effluent, filtering, drying to obtain a catalyst precursor (B); adding an active component precursor into water to obtain a solution (C), adding the catalyst precursor (B) into the solution (C), drying, and burning to obtain the catalyst. The catalyst for waste residual oil hydrogenation is fully utilized, the cost is saved, more active components are dispersed on the surface of carriers, the utilization rate of active metal is improved therefore, and at the same time, the CO conversion rate and product selectivity are both improved.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for producing natural gas by complete methanation of synthesis gas, in particular to a preparation method of a supported molybdenum-based catalyst for complete synthesis gas methanation of natural gas. 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 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/887C07C9/04C07C1/04C10L3/08
Inventor 孙晓丹张舒冬张信伟刘继华
Owner CHINA PETROLEUM & CHEM CORP
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