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Catalyst and preparation method for preparing synthesis gas through reforming reaction of CO<2> and CH<4>

A technology for catalysts and synthesis gas, which is applied in chemical instruments and methods, inorganic chemistry, and bulk chemical production, etc., and can solve problems such as loss of active components, reduction of active sites, and deactivation of catalysts.

Inactive Publication Date: 2015-12-23
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Ni-based catalysts are often deactivated due to carbon deposition, sintering, loss of active components or metal oxidation, and the reasons for the deactivation of Ni-based catalysts prepared by different methods are also different [WangS.Ind.Eng.Chem .Res.1999(38)2615-2625]
Moreover, the Ni-based supported catalyst Ni / Al 2 o 3 , the active component Ni is easy to react with the support to form NiAl 2 o 4 , will undoubtedly cause the loss of the active component Ni, and then reduce the active site, leading to catalyst deactivation [Chinese patent CN101327440A], which undoubtedly affects the application of the catalyst to a certain extent

Method used

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  • Catalyst and preparation method for preparing synthesis gas through reforming reaction of CO&lt;2&gt; and CH&lt;4&gt;
  • Catalyst and preparation method for preparing synthesis gas through reforming reaction of CO&lt;2&gt; and CH&lt;4&gt;
  • Catalyst and preparation method for preparing synthesis gas through reforming reaction of CO&lt;2&gt; and CH&lt;4&gt;

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step one: accurately weigh 41.295g nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O, analytically pure), stirred and dispersed in 67.7304g acetone solution according to the solid-to-liquid ratio (1:5), and the concentration was 1.42mol L -1 The nickel salt dispersion liquid, the γ-Al after heat treatment at 500 ℃ 2 o 3 As a carrier, add it to the above-mentioned nickel salt dispersion according to the ratio of the mass ratio of the carrier to the impregnation solution of 1:5, and use ultrasonic strengthening treatment at 20-50°C for 10 minutes, and continue to stir, stand at room temperature for 12-20h and then filter , and then dried in a vacuum dryer at 120°C for 12-20h to obtain a nickel-based catalyst precursor, roasted at 500-800°C for 2h, and then reduced for 2h under a hydrogen atmosphere at 500-800°C to prepare Nickel-based part Ni / γ-Al of nickel-based catalyst 2 o 3 , that is, component I, where the Ni loading is 9.87%.

[0027] Step 2: A certain amount of coconut sh...

Embodiment 2

[0030] Step one: accurately weigh 14.7404g nickel acetate (Ni(CH 3 COO) 2 4H 2 O, analytically pure), stirred and dispersed in 75.2692g of methanol solution according to the solid-to-liquid ratio of 1:5, and the concentration was 0.6726mol L -1 The nickel salt dispersion liquid, next treatment method is the same as embodiment 1, makes the nickel base part Ni / γ-Al of catalyst 2 o 3 , as component I of the catalyst, where the loading of Ni is 5.07%.

[0031] Step 2: Except that biochar is selected for component II, other processes are the same as in Example 1.

[0032] Step 3: Same as Example 1.

[0033] Reaction 5h obtains stable catalytic conversion rate, see figure 2 As shown, when Ni / γ-Al 2 o 3 When the content is 80%, CH 4 The conversion rate reached 76.81%, CO 2 The conversion rate reached 89.23%, while the theoretical CH 4 and CO 2 The conversions were 63.98% and 73.63%, respectively. The reforming reaction result of the catalyst of the present invention is ...

Embodiment 3

[0035] Step one: accurately weigh 3.7541g nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O, analytically pure), was dispersed in 98.6057g of 20% water-ethanol mixed solution according to the solid-liquid ratio of 1:5, and the concentration was 0.1291mol L -1 The nickel salt dispersion liquid, next treatment method is the same as embodiment 1, makes the nickel base part Ni / γ-Al of catalyst 2 o 3 , as component I of the catalyst, where the loading of Ni is 1.24%.

[0036] Step 2: Except for the pyrolysis coke of lignite selected for component II, other processes are the same as in Embodiment 1.

[0037] Step 3: Except that the reaction temperature is 900°C, the reaction space velocity is 3600mL·g -1 h -1 (Under the standard state), other processes are the same as embodiment 1.

[0038] Reaction 5h obtains stable catalytic conversion rate, see image 3 As shown, when Ni / γ-Al 2 o 3 When the content is 60%, CH 4 The conversion rate reaches 82.75%, CO 2 The conversion rate reaches 97...

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Abstract

The invention relates to a catalyst and preparation method for preparing synthesis gas through a reforming reaction of CO<2> and CH<4>. The catalyst is formed by mixing a nickel-base part, namely Ni / gamma-Al<2>O<3> (component I), with a carbon material part (component II). In the preparation process, organic solvent serves as impregnation liquid, and ultrasonic intensifying treatment is conducted in a matched mode so that active site points of the nickel-base part can be increased, and the dispersity of active components can be improved. The carbon material is utilized for replacing part of the nickel-base component, cost of the catalyst can be lowered, and meanwhile the carbon material serves as a modulation auxiliary agent and conducts regulation and control on the nickel-base part. In the reaction process, through the synergistic effect of the nickel-base part and the carbon material part, the activity and stability of the catalyst can be enhanced, and the anti-sintering performance and anti-carbon-deposit performance of the catalyst can be improved. The catalyst has the advantages that the cost is low, raw materials are easy to obtain, and catalytic activity is good.

Description

technical field [0001] The present invention relates to CO 2 and CH 4 A catalyst for reforming synthesis gas and a preparation method thereof belong to the technical field of chemical synthesis. technical background [0002] Currently, synthesis gas is mainly produced by steam reforming of methane. However, in the case of high water-gas ratio, the energy consumption of the reaction is high, and the H in the product gas 2 / CO ratio is higher. while CH 4 CO 2 reforming reaction, using CO 2 Replace water vapor with CH 4 The reaction can reduce the energy consumption of the reaction and correspondingly reduce the production cost of the synthesis gas. More importantly, the H of the synthesis gas produced is 2 The / CO ratio can be flexibly adjusted, and it can be used in oxo synthesis, F-T synthesis and other processes to prepare clean fuels and various chemical products. This process can simultaneously use two kinds of greenhouse gases as carbon sources, which is of grea...

Claims

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Application Information

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IPC IPC(8): B01J23/755C01B3/40
CPCY02P20/52
Inventor 舒新前惠贺龙徐精求舒元锋
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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