Catalyst for carbon dioxide methanation and preparation method thereof

A technology of carbon dioxide and catalyst, which is applied in the field of carbon dioxide methanation catalyst and its preparation, achieving the effects of low energy consumption, small particle size and uniform dispersion

Inactive Publication Date: 2012-07-25
SICHUAN UNIV
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Problems solved by technology

Chinese patent CN101884927 discloses a catalyst for complete methanation of carbon dioxide and its preparation method. The mass percentage of each component in the catalyst is composed of: γ-Al 2 o 3 : 60-80%; NiO: 10-20%; Fe 2 o 3 : 5-15%; MgO: 1-10%; La 2 o 3 or CeO 2 : 1-10%, but this catalyst is mainly suitable for the complete methanation of carbon dioxide under medium pressure 3.0-5.0MPa, we report the catalyst of this patent embodiment 1 (this catalyst main component and its proportioning are: 16.9%NiO- 6.5% Fe 2 o 3 -3.3%MgO-2.8%CeO 2 -70.5% γ-Al 2 o 3 ) was applied to carbon dioxide methanation reaction under n

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  • Catalyst for carbon dioxide methanation and preparation method thereof
  • Catalyst for carbon dioxide methanation and preparation method thereof
  • Catalyst for carbon dioxide methanation and preparation method thereof

Examples

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Example Embodiment

[0034] The specific steps of the preparation method of the catalyst for carbon dioxide methanation of the present invention are:

[0035] 1) Preparation of composite carrier by impregnation-precipitation method: the salt solution corresponding to the water-soluble metal oxide is impregnated in γ-Al by stirring at room temperature 2 O 3 On the carrier, the immersion time is 4-6 hours, that is, the salt solution corresponding to the water-soluble metal oxide can completely enter the γ-Al 2 O 3 In the carrier; then introduce the precipitant to the pH value of the solution 8-10 (Ce(OH) when the pH value is ≥8 3 Precipitation begins to form. In an alkaline environment with a pH value of 8-10, small crystal particles with better dispersibility are easy to form. If the pH value is too high, the particles will agglomerate sharply). The precipitant is added to better protect The salt solution corresponding to the water-soluble metal oxide is uniformly supported on the base carrier γ-Al 2 O ...

Example Embodiment

[0046] Example 1 12.7wt% NiO / 6.0wt% CeO 2 -81.3wt%γ-Al 2 O 3 Catalyst preparation

[0047] A First, CeO is prepared by dipping-precipitation method 2 / γ-Al 2 O 3 Composite carrier: Weigh 1.06g Ce(NO 3 ) 3 ·6H 2 Put O in a beaker, add 20ml of deionized water and stir to dissolve it; weigh 4.65g of γ-Al 2 O 3 Place in the above solution, stir at room temperature for 60 minutes, and then slowly add the precipitation agent NH dropwise 3 ·H 2 O(0.8mol / L) to pH=9, stir for 2 hours to make the precipitation uniform and then aging (aging, that is, let stand at room temperature) for 2 hours, filter, wash, dry overnight at 120°C, and calcinate at 550°C for 5 hours CeO 2 / γ-Al 2 O 3 Composite carrier, of which CeO 2 The mass fraction of is 6.0wt%;

[0048] Preparation of B catalyst precursor: Weigh 2.83g Ni(NO 3 ) 2 (Analytical grade, commercially available) Place in a beaker, add 20ml of deionized water and stir to dissolve; Weigh 5g of CeO prepared in step A 2 / γ-Al 2 O 3 The composite carri...

Example Embodiment

[0051] Example 2-11

[0052] Compared with Example 1, only the content of catalyst components or the types of nickel salt and water-soluble metal salt used are different, and the other processes are the same as those of Example 1, and each finished catalyst is prepared. The catalyst composition of Examples 2 to 11 and the nickel salt and water-soluble metal salt used are shown in Table 1.

[0053] Table 1 Catalyst composition table

[0054]

[0055] The catalyst obtained in Examples 1-11 was tableted and sieved to obtain catalyst particles of 60-80 mesh, and 200 mg was filled in a fixed bed reactor, and hydrogen was used for in-situ reduction. The reduction temperature was 450°C and the reaction pressure was normal pressure. The raw material gas ratio is n(H 2 ): n(CO 2 )=4∶1, gas volumetric space velocity 10000ml / h·g cat The temperature range of the investigation is 240-360℃, and the composition of the tail gas is analyzed by the TDX01 column of the GC-1690 gas chromatograph (TCD),...

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Abstract

The invention discloses a catalyst for carbon dioxide methanation and a preparation method of the catalyst, belonging to the technical field of carbon dioxide methanation. The catalyst for carbon dioxide methanation is composed of a composite carrier and an active ingredient at a ratio of 84-90wt%:10-16wt%, wherein the composite carrier is composed of gamma-Al2O3 and water soluble metal oxide at a mass ratio of 77-86:2-10; and the active ingredient is Ni which exists in the catalyst in a form of NiO. The catalyst is high in activity, low in cost and better in stability, and can be used for carbon dioxide methanation reaction under normal pressure condition.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide methanation, and in particular relates to a catalyst for carbon dioxide methanation and a preparation method thereof. Background technique [0002] Carbon dioxide is one of the most abundant carbon sources on earth. With the increasing depletion of petroleum resources and the serious ecological and environmental problems caused by the massive emission of carbon dioxide into the atmosphere, the greenhouse gas CO 2 Transformation into high value-added chemical products has become a hot topic of research and discussion in domestic and foreign industries and academic circles. In 1902, the French chemist Paul Sabatier first reported the catalytic hydrogenation reduction technology of carbon dioxide (ie CO 2 methanation reaction): CO 2 (g)+4H 2 (g)=CH 4 (g)+2H 2 O(g)Δ R h 0 298K=-252.9KJ·mol -1 , with CO 2 Hydrogenation to synthesize methane gas, on the one hand CO 2 Turning waste into...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J23/755B01J37/34C07C1/12C07C9/04
Inventor 蔡梦蝶江成发成雪清李泽军
Owner SICHUAN UNIV
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