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Coal gas methanation catalyst and preparation method thereof

A catalyst, methanation technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. Problems such as the flying temperature of the bed layer, to achieve the effect of increasing the dispersion, not easy to deposit carbon, and conducive to diffusion

Inactive Publication Date: 2011-07-06
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, what is being dealt with now is that the CO content is as high as 30%, the amount of methanation reaction is large, and the adiabatic temperature rise of the reaction is large, which may easily lead to "flying temperature" of the reaction bed and sintering deactivation of the catalyst, which requires a high heat resistance temperature of the methanation catalyst , good thermal stability
At present, there is no large-scale production and operation of coal-to-natural gas in China, and its methanation catalyst is in the research and development stage

Method used

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  • Coal gas methanation catalyst and preparation method thereof
  • Coal gas methanation catalyst and preparation method thereof
  • Coal gas methanation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a. Al(NO 3 ) 3 9H 2 O, CTAB, ethanol and water are mixed to obtain a transparent solution; then aluminum nitrate and NH 3 ·H 2 The molar ratio of O is 1:10, add ammonia water, stir quickly to disperse the system; then add large mesoporous alumina, large mesoporous alumina and Al(NO 3 ) 3 9H 2 The molar ratio of O is 0.6, stir evenly, and put it in a water bath at 50°C for 20 hours to obtain a wet gel;

[0027] b. Remove the supernatant of the wet gel, dry the resulting product in a drying oven at 80°C for 20h, grind it into powder, and then bake it at 600°C for 3h to remove the template agent, and obtain Al with double mesoporous distribution 2 o 3 Carrier, the most probable diameter of the small mesopore is 6.5nm, the most probable diameter of the large mesopore is 24.1nm, and the specific surface area is 194m 2 / g, the pore volume is 0.56cm 3 / g;

[0028] c. Then the prepared γ-Al with double mesoporous distribution 2 o 3 Carrier and Ni(NO3) 2 .6H 2 O in...

Embodiment 2

[0031] Al(NO 3 ) 3 9H 2 O, CTAB, ethanol, and water have a molar ratio of 1:0.20:10:90 to obtain a transparent solution; according to aluminum nitrate: NH 3 ·H 2 Add ammonia water at a molar ratio of O to 1:8, stir rapidly to disperse the system, and then add an appropriate amount of large mesoporous alumina, large mesoporous alumina and Al(NO 3 ) 3 9H 2 The molar ratio of O is 0.8, and the mixture is evenly stirred. Aging treatment in a water bath at 60°C for 15 hours to obtain a wet gel; remove the supernatant of the wet gel, dry the resulting product in a drying oven at 100°C for 18 hours, and then bake at 550°C for 4 hours to remove the template agent, namely γ-Al with double mesoporous distribution 2 o 3 , the most probable diameter of small pores is 6.6nm, the most probable diameter of large pores is 24.7nm, and the specific surface area is 188m 2 / g, the pore volume is 0.55cm 3 / g;

[0032] Then the prepared γ-Al 2 o 3 Carrier and La(NO3) 3 .6H 2 The mass...

Embodiment 3

[0035] Al(NO 3 ) 3 9H 2 The molar ratio of O, CTAB, ethanol, and water is 1:0.22:12:88, and a transparent solution is obtained. According to aluminum nitrate: NH 3 ·H 2 O is 1:10, add ammonia water in a molar ratio, and stir rapidly to disperse the system. Then add an appropriate amount of large mesoporous alumina, large mesoporous alumina and Al(NO 3 ) 3 9H 2 The molar ratio of O is 1.25, stir well. Place it in a water bath at 50°C for aging treatment for 20 hours to obtain a wet gel. Remove the supernatant, dry the obtained product in a drying oven at 80°C for 20 hours, take it out, grind it into powder, and then bake it at 600°C for 3 hours to remove the template agent, and then obtain Al with double mesoporous distribution. 2 o 3 , the most probable diameter of small pores is 6.4nm, the most probable diameter of large pores is 23.4nm, and the specific surface area is 175m 2 / g, the pore volume is 0.51cm 3 / g.

[0036] Then the prepared γ-Al 2 o 3 Carrier and...

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Abstract

The invention discloses a coal gas methanation catalyst and a preparation method thereof, wherein the catalyst comprises the following compositions in percentage by weight: 12-25 percent of NiO, 0-9 percent of La2O3 and the balance of Al2O3, wherein the NiO and the La2O3 are carried on gama-Al2O3 carriers in dual-mesoporous distribution. The invention has the following advantages: the catalyst carriers in dual-mesoporous distribution can reduce transfer resistance and be beneficial to dispersion of reactants and products, and is not easy to generate accumulated carbon. In the invention, the catalyst is added with assistant La, thus being capable of restricting the generation of nickel aluminium spinel NiAl2O4, leading the size of nickel crystal grains to be refined, increasing the dispersion degree of Ni and being beneficial to improvement of activity and stability of the catalyst. The catalyst is applicable to operation at high air speed, thus having higher material handling capability.

Description

technical field [0001] The invention belongs to a catalyst and a preparation method, in particular to a coal-to-gas methanation catalyst and a preparation method thereof. Background technique [0002] my country's basic energy structure is characterized by "rich coal, poor oil and little gas". For a long time, coal has occupied an absolute dominant position in my country's energy structure. With the rapid development of my country's national economy, the demand for energy will continue to increase, and my country's energy structure characteristics of "rich coal, poor oil and little gas" determine that coal resources will continue to be developed as the main energy source for a long period of time in the future and exploit. [0003] The contradiction between supply and demand of natural gas in my country is prominent, and the situation is not optimistic. Experts predict that the demand for natural gas in my country will reach 100 billion to 110 billion cubic meters in 2010, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C10K3/04
Inventor 郭翠梨张金利张俊涛王鑫詹吉山
Owner TIANJIN UNIV
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