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Nickel-based methanation catalyst dispersive in SBA-15 ducts and preparation and application thereof

A nickel-based methane and catalyst technology, which is applied in the field of nickel-based methanation catalysts and their preparation and application, can solve the problems of difficulty in dispersing uniform active components on the surface of the metal carrier, migration of active components, cumbersome preparation process, etc., and achieve the goal of preparing The method is simple and easy to implement, cost-effective advantages, and the effect of high metal dispersion

Active Publication Date: 2017-09-26
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, many scholars have studied the influence of surfactants on metal dispersion and catalytic performance in metal catalysts, but most of them use the deposition precipitation method to prepare catalysts. Compared with the impregnation method, the preparation process is more cumbersome and costly. higher
[0004] Chinese patent CN104549411A discloses a "preparation of a nickel-based catalyst based on SBA-15 and its application in the preparation of SNG", but the active components will migrate during the drying and calcination process, which will eventually lead to the metal on the surface of the carrier. Difficult to disperse evenly and the active component Ni mostly gathers on the outer surface of the mesoporous molecular sieve

Method used

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  • Nickel-based methanation catalyst dispersive in SBA-15 ducts and preparation and application thereof
  • Nickel-based methanation catalyst dispersive in SBA-15 ducts and preparation and application thereof
  • Nickel-based methanation catalyst dispersive in SBA-15 ducts and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) 0.55g nickel nitrate hexahydrate and 0.55g sodium dodecyl sulfate (SDS) are dissolved in 10g deionized water;

[0037] (2) Weigh 1.0g of SBA-15 white powder, add SBA-15 white powder into the solution and soak for 10h, take out after dipping, dry in vacuum at 50°C for 8h, then bake in air at 500°C for 5h, and cool to room temperature naturally, That is, the Ni / SBA-15 catalyst was prepared, which was recorded as 10% Ni / S15 (S1), and the nickel loading was 10 mol%.

[0038]The 10%Ni / S15(S1) prepared in this embodiment has small angle and wide angle XRD patterns as figure 1 As shown, the TEM picture is as figure 2 (B) shown. Depend on figure 1 (A) It can be seen that the sample has relatively clear (100), (110), and (200) peaks, these peaks are the characteristic peaks of the regular mesoporous molecular sieve SBA-15, indicating that the introduction of metallic nickel did not destroy the original carrier. Some ordered mesoporous structure. Depend on figure 1 (B)...

Embodiment 2

[0040] Substitute sodium lauryl sulfate in embodiment 1 with citric acid, all the other are the same as embodiment 1, make Ni / SBA-15 catalyst, record as 10%Ni / S15(CA), nickel load is 10mol%.

[0041] The catalyst 10%Ni / S15(CA) that present embodiment prepares, its small-angle and wide-angle XRD collection of patterns are as follows figure 1 shown. From figure 1 (A) It can be seen that the order of mesoporous molecular sieves still exists after the introduction of nickel metal; from figure 1 It can be seen in (B) that compared with the catalyst 10% Ni / S15 (S1), the intensity of the characteristic diffraction peak of NiO has increased, which indicates that the particle size of NiO in the catalyst has increased.

Embodiment 3

[0043] Replace the 0.55g nickel nitrate hexahydrate in embodiment 1 with 0.6g nickel acetate tetrahydrate, all the other are with embodiment 1, make Ni / SBA-15 catalyst, be recorded as 10%Ni / S15 (AC), nickel load capacity is 10mol%.

[0044] Depend on figure 1 (A) It can be seen that the sample has relatively clear (100), (110), and (200) peaks, these peaks are the characteristic peaks of the regular mesoporous molecular sieve SBA-15, indicating that the introduction of metallic nickel did not destroy the original carrier. Some ordered mesoporous structure. Depend on figure 1 (B) It can be seen that in addition to the obvious characteristic broad peaks (15-35°) of silicon oxide on the wide-angle XRD spectrum of the sample, there are also characteristic diffraction peaks of NiO particles (2θ=37.5°, 43.7°, 63.7 °) peak.

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Abstract

The invention relates to a nickel-based methanation catalyst dispersive in SBA-15 ducts and preparation and application thereof; the nickel-based methanation catalyst comprises, by 100 parts by weight, 5-20 parts of metallic nickel, 10-40 parts of an additive, and the balance of mesoporous molecular sieve SBA-15. The preparation comprises: preparing nickel salt solution, and adding an additive; in the nickel salt solution, soaking the SBA-15 in mixed liquid prepared in step A at room temperature, and calcining in vacuum after soaking to obtain the nickel-based methanation catalyst. By adding the additive and using the mesoporous molecular sieve SBA-15 with stable chemical properties, good thermal conductivity and large specific surface area as a support, the nickel-based metal catalyst with the active component dispersive in support ducts is prepared; the catalyst has the advantages of high catalytic activity, good methane selectivity, good thermal selectivity, long catalyst life and the like. Under optimal conditions, the catalyst may reach 100% in CO conversion rate, 99.9% in methane selectivity and 99.9% in methane yield, and has a promising industrial prospect.

Description

technical field [0001] The invention belongs to the technical field of catalysts and their preparation, and in particular relates to a nickel-based methanation catalyst highly dispersed in SBA-15 channels and its preparation and application. Background technique [0002] my country's energy structure is "rich in coal, short of oil, and low in gas". Actively develop coal-based synthetic natural gas (SNG) to replace natural gas or city gas to meet the growing market demand and contribute to my country's energy security, energy conservation, and emission reduction. aspect is of great importance. Syngas (CO and H 2 ) Methanation is the most critical part of coal-to-synthetic natural gas, and the methanation of high-concentration CO is a strong exothermic reaction. When the heat cannot be discharged in time, it will cause a very high temperature rise instantaneously, resulting in catalyst sintering and carbon deposition. Therefore, it is of great significance to study high tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03C10L3/08
CPCB01J29/0333B01J2229/186C10L3/08
Inventor 辛忠陶淼
Owner EAST CHINA UNIV OF SCI & TECH
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