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Coal gasification catalyst completely methanated by synthesis gas and preparation and application thereof

A complete methanation and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, hydrocarbon production from carbon oxides, etc., to achieve good hydrothermal stability and improve hydrothermal stability performance and improve long-term stability

Active Publication Date: 2010-06-02
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many patented technologies related to complete methanation catalysts, there is still no record of real long-term industrial operation above 600 °C, so the methanation catalyst system still needs to be further improved, especially when the complete methanation catalyst is used in water above 600 °C Thermal stability needs to be further optimized

Method used

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  • Coal gasification catalyst completely methanated by synthesis gas and preparation and application thereof
  • Coal gasification catalyst completely methanated by synthesis gas and preparation and application thereof
  • Coal gasification catalyst completely methanated by synthesis gas and preparation and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1 catalyst preparation method

[0044] 393.574g Zr(NO 3 ) 4 ·3H 2 O was dispersed in 800ml of deionized water, heated to 75-80°C with stirring to dissolve it completely, and the solution was cooled to 1000ml to obtain Zr(NO 3 ) 4 solution.

[0045] Weigh 40.71g Ni(NO 3 ) 2 .6H 2 O, 39.16g (NH 4 ) 2 Ce(NO 3 ) 2 , 7.95gLa(NO 3 ) 3 .6H 2 O, 1M Zr(NO 3 ) 4 Solution 71.4ml, urea 60g, add deionized water to dissolve to 2000mL; slowly heat the above mixed solution to 90°C in a water bath, the mixture gradually becomes turbid and starts to react, keep the reaction for 40 hours, the pH value rises from 2.3 to about 7.

[0046] The above precipitate was filtered, and the filter cake was washed twice with 1000 mL of deionized water and filtered again. The obtained filter cake was dried at 110°C for 12 hours; the dried sample was placed in a muffle furnace, and the temperature increase rate was 2.5°C / min, and it was roasted at 500°C for 2 hours; the obta...

Embodiment 2

[0047] Embodiment 2 Catalyst evaluation method

[0048] The prepared catalyst samples were tested and evaluated for the methanation reaction performance of synthesis gas in a fixed-bed reactor. According to the multi-stage methanation process for preparing synthetic natural gas from coal-based syngas methanation described in the present invention, the following reaction evaluation conditions are set:

[0049] (1) One stage methanation reaction

[0050] Raw gas composition: 34.0%H 2 , 9.0% CO, 2.0% CO 2 , 39% CH 4 , 16.0%H 2 O (mole percent);

[0051] Raw material gas GHSV: 20000hr -1 (dry airspeed);

[0052] Pressure: 3.5MPa;

[0053] Catalyst bed inlet temperature: 300°C;

[0054] Catalyst bed hot spot temperature: 650°C;

[0055] Catalyst particle size: 40-60 mesh;

[0056] Catalyst bed height: 30mm.

[0057] (2) Two-stage methanation reaction

[0058] Raw gas composition: 24.0% H 2 , 2.0% CO, 5.0% CO 2 , 46.0% CH 4 , 23.0%H 2 O (mole percent);

[0059] Raw...

Embodiment 3

[0080] Example 3CeO 2 The role of the base complex oxide

[0081] What this embodiment attempts to illustrate is that CeO in the present invention 2 The influence of base composite oxide as catalyst carrier on the methanation performance of the catalyst of the present invention. Adopt the method for preparing catalyst described in embodiment 1 to prepare Al 2 o 3 -ZrO 2 Composite oxide is as the catalyst comparison example (comparison sample 1) of carrier, and the composition of comparison sample 1 is 30%NiO-36%Al 2 o 3 -24% ZrO 2 -10%La 2 o 3 .

[0082] The above-mentioned catalyst sample 1 and comparative sample 1 were tested for methanation performance by adopting the processing conditions of the third stage methanation reaction, the results are shown in figure 1 and figure 2 . Depend on figure 1 Visible, with Al 2 o 3 -ZrO 2 Composite oxides as supported methanation catalysts compared to CeO 2 The catalyst of the present invention based on composite oxide...

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Abstract

The invention relates to a coal gasification catalyzer completely methanated by synthesis gas and a preparation and application thereof. The catalyzer contains an active component, a carrier and an accessory ingredient, wherein the active component is a transition metal oxide NiO, and the content of NiO is 10-75 percent of the total weight of the catalyzer; the carrier is a CeO2-based rare earth metal oxide, and the content of the rare earth metal oxide is 10-19 percent of the total weight of the catalyzer; and the accessory ingredient is La2O3, and the content of La2O3 is 0.1-15 percent of the total weight of the catalyzer; the preparation method adopts a simple homogeneous phase chemical precipitation process. The invention has the advantages of low cost on raw materials and simple preparation method, meets the current increasing needs of clean energies and meanwhile has the irreplaceable important role in the enhancement of international energy sources and resource security.

Description

technical field [0001] The invention belongs to the field of catalyst chemistry, and in particular relates to a catalyst for complete methanation of coal gasification through synthesis gas, its preparation and application. Background technique [0002] Coal gasification is the most important core technology in the chemical system based on coal. The energy and chemical system based on it can not only better solve the problems of efficiency and pollution emissions in the coal conversion process, but also produce fuel and electricity, etc. Energy products are of great significance to solving the comprehensive utilization of coal resources and alleviating the shortage of oil and gas resources in China. [0003] Methanation reaction is an important hydrogenation reaction with a wide range of applications. Using methanation technology to reduce CO in gas x Methanation to produce substitute natural gas not only greatly increases the calorific value of gas, but also increases the ...

Claims

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Application Information

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IPC IPC(8): B01J23/83C10L3/08C07C9/04C07C1/04C07C1/12
Inventor 王树东彭家喜袁中山孙天军张纯希袁权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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