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Catalyst preparation method for producing natural gas through complete methanation of synthesis gas

A complete methanation and catalyst technology, 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 cost, promoting dispersion, improving conversion rate and product selectivity

Active Publication Date: 2018-03-13
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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  • Catalyst preparation method for producing natural gas through complete methanation of synthesis gas
  • Catalyst preparation method for producing natural gas through complete methanation of synthesis gas

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Experimental program
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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: 1.9 wt%, Al 2 o 3 : 71.2 wt%), grind the catalyst to 200 mesh (referring to passing through a 200 mesh sieve), weigh 100 grams of powder, add 260 mL of 98 wt% concentrated sulfuric acid, stir at a constant temperature of 50 ° C to dissolve the solid, and collect the filtrate by filtration. Add 54.01g of nickel nitrate to the filtrate, stir to 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 After the solution was evaporated to dryness, the resulting solid was dried at 100°C for 8 hours and calcined at 600°C for 4 hours to obtain catalyst precursor A, wherei...

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: 1.9 wt%, Al 2 o 3 : 71.2 wt%), grind the catalyst to 200 mesh (referring to passing through a 200 mesh sieve), weigh 100 grams of powder, add 300 mL of a mixed solution of 98 wt% concentrated sulfuric acid and 65 wt% concentrated nitric acid, and the volume ratio is 2:1 , 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), all After dissolving, add 24.87g of pseudo-boehmite, stir at 70°C until the solution is evaporated to dryness, dry the obtained solid at 100°C for 8 hours,...

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: 1.9 wt%, Al 2 o 3 : 71.2 wt%), grind the catalyst to 200 mesh (referring to passing through a 200 mesh sieve), weigh 100 grams of powder, add 450 mL of a mixed solution of 35 wt% concentrated hydrochloric acid and 65 wt% 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 and dissolve, then add 13.66g of citric acid (the molar ratio of citric acid to Mo in the waste agent is 0.5), all After dissolving, add 142.13g of pseudo-boehmite, stir at 70°C until the solution is evaporated to dryness, dry the obtained solid at 100°C for 8 h...

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Abstract

The invention relates to a method for preparing a catalyst for producing natural gas through complete methanation of synthesis gas. The catalyst includes an active component, an auxiliary agent and a carrier. The method for preparing the catalyst comprises: treating a waste residue oil hydrogenation catalyst to prepare a catalyst precursor A ; Then adopt reducing atmosphere to carry out reduction treatment to catalyst precursor A; Add the reduced catalyst precursor A and polyhydric alcohol solution in the autoclave to carry out hydrogenation reaction, place the reaction effluent and then filter and dry to obtain the catalyst precursor Body B; the active component precursor is dissolved in water to obtain solution C, and then catalyst precursor B is added, and after drying and roasting treatment, the catalyst is obtained. The method of the invention not only makes full use of the waste residue oil hydrotreating catalyst, saves cost, but also promotes the dispersion of more active components on the surface of the carrier, which not only improves the utilization rate of active metals, but also improves the conversion rate of carbon monoxide and the product selectivity.

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 Patents(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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