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Coal bed gas deoxidation catalyst as well as preparation method and application thereof

A deoxygenation catalyst, catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc. problem, to achieve the effect of eliminating the active oscillation phenomenon, improving stability and stabilizing the combustion process

Inactive Publication Date: 2010-03-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is because, on the one hand, as the reaction proceeds and O 2 As the concentration gradually decreases, the decomposition conversion temperature of PdO→Pd will gradually move forward; on the other hand, in the overall reducing atmosphere, PdO will be quickly and completely reduced to Pd at a lower temperature, resulting in the loss of catalyst active sites In severe cases, the temperature of the reaction bed may be lower than the catalyst light-off temperature, leading to the termination of the reaction / flame out, thus making it difficult to realize the technical solution of deoxygenation and purification through catalytic combustion of coalbed methane
[0009] In view of this, the above-mentioned various supported noble metal Pd catalysts developed for oxygen-rich conditions may not be suitable for CH under rich-burn-lean conditions involved in the present invention. 4 For catalytic combustion conditions, it is necessary to develop a new type of supported noble metal Pd catalyst specifically for the reducing atmosphere rich in combustion and lean in oxygen

Method used

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  • Coal bed gas deoxidation catalyst as well as preparation method and application thereof
  • Coal bed gas deoxidation catalyst as well as preparation method and application thereof
  • Coal bed gas deoxidation catalyst as well as preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0052] 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. Take 100ml of the above solution, together with 43.465g Ce(NO 3 ) 3 ·6H 2 O, 37.876gAl(NO 3 ) 3 9H 2 O was dissolved in deionized water and fixed to 300ml. Under the condition of constant stirring, 25-28% ammonia water was dripped into the above mixed solution with a separatory funnel. The amount of ammonia water was controlled according to the pH value until the pH value reached 8-9. Then the obtained precipitate was fully stirred for 2 hours, suction filtered, and the filter cake was washed 3 times with 1200ml of deionized water, and the washed filter cake was placed in a vacuum oven at 60°C for 20 hours and dried in a muffle furnace at 2.5 The heating rate of °C / min was raised to 500 °C for 2 hours to obtain 34.314g weight percent composition of 50% CeO 2 -35...

Embodiment 2

[0056] Add 30L deionized water in the reactor of 70L, the urea of ​​6459g, the (NH 4 ) 2 Ce(NO 3 ) 6 into the kettle, and finally Zr(NO with a concentration of 1M 3 ) 4 2.39 L of the solution and an additional 12 L of deionized water were added to the kettle. Heat the feed liquid in the kettle until the urea decomposes and further heat to a boiling state (98-100°C) and stir for 4 hours, then stop heating and continue to stir and age for 2 hours to obtain CeO by homogeneous co-precipitation 2 -ZrO 2 Complex oxide precursors. Centrifugally filter the prepared precipitate, fully wash the filter cake twice in the reaction kettle with 60 L of boiling water under stirring, and perform centrifugal filtration after each washing. After washing and filtering twice with deionized water, the obtained filter cake was fully dispersed in 10 L of isopropanol solvent to take away the residual water in the precipitate, and the isopropanol was centrifuged and filtered. The resulting prec...

Embodiment 3

[0060] Adopting the method for preparing Ce-Zr composite oxide described in example 2 to prepare weight percentage composition is 58%CeO 2 -42% ZrO 2 Ce-Zr composite oxide powder and sampled for BET and H 2 - TPR characterization. The BET specific surface area of ​​the Ce-Zr composite oxide is 120.4m 2 / g, its H 2 - The TPR spectrum is shown in figure 1 , the reduction process H 2 The consumption is 810.7μmol / g.

[0061] Replace the Ce-Zr-Al ternary compound or microcrystalline mixture in Example 1 and Example 2 with the Ce-Zr composite oxide powder prepared above, and prepare CeO in Example 1 and Example 2 2 Ce-Zr composite oxide slurry is prepared by the method of based composite oxide slurry, and the coating of Ce-Zr composite oxide, MgO and noble metal Pd is carried out with the same coating coating method, and the obtained specific composition is 0.18% The catalyst sample of Pd / 3.12%MgO / 12.76%Ce-Zr-Ox / 83.94% cordierite, the sample code is Example-3.

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Abstract

The invention relates to a coal bed gas deoxidation catalyst as well as a preparation method and the application thereof. The coal bed gas deoxidation catalyst takes one or the combination of severalplatinum group noble metals, i.e. Pd, Pt, Ru, Rh and Ir, as main catalyzing active components and takes one or the combination of several alkali metal / alkaline-earth metal oxides, i.e. Na2O, K2O, MgO,CaO, SrO and BaO, and multi-element compound oxides of CeO2, lanthanide series rare earth elements, i.e. Pr, Nd, Sm, Eu, Gd, and the like, or / and transition elements, i.e. Y, Zr, La, and the like, or / and gamma-Al2O3 as auxiliary catalysts, and the catalyzing components are loaded on an inert carrier in a coating way so as to prepare an integral catalyst. The coal bed gas deoxidation catalyst hasthe advantages of low igniting temperature, stable combustion process, high activity, long service life, and the like, is suitable for the methane catalyzing and combustion process taking coal bed gasdeoxidation purification as a purpose and can also be extensively applied to the catalyzing and combustion process of CO and low-carbon hydrocarbon under fuel-rich and oxygen-poor reducing atmosphere.

Description

technical field [0001] The invention relates to a coal bed gas deoxidation catalyst, its preparation method and application. Background technique [0002] Coal bed methane is a kind of hydrocarbon gas attached to coal seams, and its main component is high-purity methane (CH 4 ). Since coalbed methane does not contain sulfur (H 2 S) and other harmful impurities, and does not contain carcinogenic toxic substances such as benzene, mercury, lead, etc., so coal bed methane is a high-quality clean energy recognized by the world. [0003] The quality of coalbed methane produced by surface drilling and underground drainage is very different, and its utilization methods are also very different. CH in the coalbed methane extracted from the former 4 Concentration above 90%, suitable for input into natural gas pipeline system, can be used as power generation fuel, industrial fuel, vehicle fuel, chemical raw material and residential fuel. And the CH in the coalbed methane recovered ...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J23/58B01J37/02B01J37/16C10K1/34
Inventor 王树东袁中山王胜张纯希倪长军
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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