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A kind of highly active, anti-carbon deposition methane dry gas reforming catalyst and preparation method thereof

A technology for dry gas reforming and carbon deposition of methane, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Stacking, reduction of active metal utilization rate, reduction of material specific surface area, etc., to achieve the effect of improving the utilization rate of raw materials and the yield of composite materials, reducing the rate of carbon deposition, and reducing the use of

Active Publication Date: 2021-10-19
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the methane dry gas reforming reaction, the operating conditions are often carried out at relatively high temperatures (>600°C). After high-temperature treatment, the above-mentioned sheet-shaped hydroxide materials are prone to agglomeration and stacking, and lose their original sheet structure. During the process, the specific surface area of ​​the material decreases, the utilization rate of the active metal decreases, and the catalyst is deactivated.

Method used

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  • A kind of highly active, anti-carbon deposition methane dry gas reforming catalyst and preparation method thereof
  • A kind of highly active, anti-carbon deposition methane dry gas reforming catalyst and preparation method thereof
  • A kind of highly active, anti-carbon deposition methane dry gas reforming catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of Ni-Mg-Al nanosheets: take 5.0mmol of Ni(NO 3 ) 2 ·6H 2 O, 40.0mmol of Mg(NO 3 ) 2 ·6H 2 O and 15.0mmol of Al(NO 3 ) 3 9H 2 O, dissolved in 50 mL deionized water to make solution A. Prepare another 200mL NaOH solution with a concentration of 0.13mol / L, which is called solution B. Put solution B in a water bath at 30°C, add solution A into it under vigorous stirring, and continue stirring for 60 minutes. After filtering and washing, the precipitate was redispersed in 200 mL of deionized water, put into a hydrothermal kettle, and heated at 100°C for 16 hours to obtain a nanosheet sol with a solid content of 4.0 mg / mL. Confirmed by XRD results ( figure 1 ), the material has a nanosheet structure, denoted as NMA.

[0035] Preparation of coated Ni-Mg-Al@SiO 2 Composite material: Measure 90 mL of nanosheet sol, add 7 mL of ammonia water, and 1.30 mL of tetraethyl orthosilicate (TEOS), and stir and react in a water bath at 30°C for 16 hours. The prod...

Embodiment 2

[0038] Example 1 was repeated, but the amount of TEOS added was 0.65 mL to obtain a composite material NMAS-2 with a sheet-coated structure, and the thickness of the coating layer was 2 nm. After reduction and activation, NMAS-2-R, a highly active and carbon-resistant methane dry gas reforming catalyst, was obtained.

Embodiment 3

[0040] Example 1 was repeated, but the amount of TEOS added was 2.60 mL to obtain a composite material NMAS-3 with a sheet-coated structure, and the thickness of the coating layer was 7 nm. After reduction and activation, NMAS-3-R, a highly active and carbon-resistant methane dry gas reforming catalyst, was obtained.

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Abstract

The invention discloses a high-activity, carbon-deposition-resistant methane dry gas reforming catalyst and a preparation method thereof. Specifically, a stable sol with a nano-sheet structure is prepared by a precipitation method, and then an in-situ encapsulation of the second component is carried out. Coating, drying, calcining, and reduction activation to obtain a catalyst with a nano-sheet-shaped coating structure, which exhibits high activity and anti-carbon performance in the methane dry gas reforming reaction, and has no effect in continuous operation at 400-900 °C. Apparently inactive. The raw material of the invention is easy to obtain, the process is simple, and in addition, the invention can be expanded to be applied to methane steam reforming, carbon dioxide-assisted dehydrogenation of ethane propane, and water-steam shift reaction.

Description

technical field [0001] The invention belongs to the field of methane dry gas reforming, and in particular relates to a high-activity, carbon-deposition-resistant methane dry gas reforming catalyst and a preparation method thereof. Background technique [0002] methane dry gas reforming to synthesis gas (CH 4 +CO 2 =CO+H 2 ) is an important process for the utilization of natural gas. This process can realize the conversion and utilization of two main greenhouse gases at the same time. The CO / H in the obtained syngas 2 The ratio is close to 1, which is beneficial to the synthesis of oxygen-containing compounds or obtaining high value-added products such as hydrocarbons through the Fischer-Tropsch process, which has important environmental protection significance and economic value. Catalyst is the key to realize methane dry gas reforming, and Group VIII transition metal catalyst is the main active component. Among them, supported noble metals Ru and Rh have excellent react...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J35/02C01B3/40
CPCB01J23/78B01J35/0046B01J35/023C01B3/40C01B2203/0233Y02P20/52
Inventor 陆安慧贺雷
Owner DALIAN UNIV OF TECH
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