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Catalyst for hydrogenation of CO2 to prepare methane, and preparation method of catalyst

A catalyst, a technology for producing methane, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, catalyst, etc., can solve the problems of cumbersome synthesis process and unenvironmental protection, and achieves simple process and utilization rate. High, prevent sintering effect

Active Publication Date: 2020-02-11
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, providing a CO 2 Hydrogenation methane catalyst and its preparation method, using plant matter extract as reducing agent, protecting agent and complexing agent, adopting "one-pot method" to greenly synthesize noble metal @LaCoO with core-shell structure 3 Catalyst, so that the catalyst has good carbon dioxide hydrogenation methane activity, solves the problems of cumbersome synthesis process and environmental protection in the above-mentioned background technology

Method used

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  • Catalyst for hydrogenation of CO2 to prepare methane, and preparation method of catalyst
  • Catalyst for hydrogenation of CO2 to prepare methane, and preparation method of catalyst
  • Catalyst for hydrogenation of CO2 to prepare methane, and preparation method of catalyst

Examples

Experimental program
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Effect test

Embodiment 1～3

[0027] a CO 2 The preparation method of hydrogenation methane catalyst comprises the steps:

[0028] 1) Weigh 10.0 g of Arborvitae leaves, mix them with 150 mL of deionized water, boil in an oil bath at 120°C for 5 minutes, take them out, cool to room temperature, and filter with suction to obtain the extract of Arborvitae;

[0029] 2) Take three parts of the 25 mL step 1) of the Thuja arborvitae extract, place them in 50 mL beakers, heat and stir in an oil bath at 90 ° C, and then add palladium nitrate, chloroplatinic acid, and nitric acid to different beakers Silver (control loading is 3wt%), then add 0.4000g lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O), 0.2688g cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) (the amount of lanthanum nitrate and cobalt nitrate is 1:1), continue to heat and stir until the solution is evaporated to dryness (about 3h), then transfer the sample to the crucible, in the muffle furnace at 2 ℃ / min Calcination for 1 hour after the heating rate rises from ro...

Embodiment 4～7

[0039] The difference between Examples 4-7 and Example 1 is that the loaded amount of noble metal Pd is different, respectively 0.5% Pd@LaCoO 3 , 1.0% Pd@LaCoO 3 , 5.0% Pd@LaCoO 3 and 8.0% Pt@LaCoO 3 sample.

Embodiment 8～11

[0041] The difference between Examples 8-11 and Example 1 is that 3% Pd@LaCoO is prepared under calcination conditions of 600, 700, 800 and 900°C respectively 3 .

[0042] One, embodiment 1~3, comparative example 1 and 2 morphology comparison

[0043] Such as figure 1 , the upper left is the LaCoO prepared in Comparative Example 1 3 (Unloaded) samples, shown in the figure as nanoparticles with a diameter of 20-50nm, which are relatively uniform inside, and no fine nanoparticles are observed; while the 3%Pd@LaCoO prepared in Examples 1-3 3 (upper right), 3% Ag@LaCoO 3 (bottom left) and 3%Pt@LaCoO 3 (Bottom right) samples, LaCoO can be observed 3 Nanoparticles (20-50nm) contain nanoparticles with a diameter of 3-8nm inside, which shows that the sample prepared by the "one-pot method" of plant extracts has a special core-shell structure, and the noble metal (as the core) is covered by LaCoO 3 Wrapped inside (for the shell).

[0044] Such as figure 2 , the peaks of each s...

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Abstract

The invention discloses a catalyst for hydrogenation of CO2 to prepare methane, and a preparation method of the catalyst. A "one-pot method" is used, a noble metal precursor, lanthanum nitrate and cobalt nitrate are mixed with a Platycladus orientalis extraction liquid, and stirring, evaporating to dryness, calcination, and washing are performed to obtain the noble metal@LaCoO3 catalyst. The catalyst has a special structure, that is, the noble metal is a core, the perovskite-type LaCoO3 is a shell, and the catalyst has good activity for hydrogenation of CO2 to prepare methane. The plant matteris used as a raw material, the "one-pot method" is used to synthesize the catalyst, a utilization rate of the noble metal can be significantly improved, and the catalyst has the advantages of green and environmental protection, simple process, easy industrial production, and the like.

Description

technical field [0001] The present invention relates to a CO 2 Hydrogenation methane catalyst and preparation method thereof. Background technique [0002] Hydrogenation of CO2 to produce higher value hydrocarbons (e.g. CH 4 ) or lower olefins can effectively solve CO 2 The environmental problems caused by a large amount of emissions can also turn waste into treasure and alleviate the problem of energy shortage. It is a CO with considerable application prospects. 2 Resource path. CO 2 The methanation reaction was proposed by the French scientist Paul Sabatier in 1902, also known as the Sabatier reaction. CH 4 Has a variety of advantages over H 2 characteristics such as CH 4 It is easy to liquefy and can be stored and transported more safely. As the main component of natural gas, it is widely used in energy-intensive industries. At the same time, the CO 2 converted to CH 4 The process is one of the most attractive and promising technologies for converting electrica...

Claims

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Application Information

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IPC IPC(8): B01J23/89C07C1/12C07C9/04
CPCB01J23/002B01J23/894C07C1/12C07C2523/89C07C9/04
Inventor 李清彪李雯王坤灿黄心童黄俊杰黄加乐
Owner XIAMEN UNIV
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