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Non-uniform combustion catalyst and method for preparing the same

A technology for burning catalysts and catalysts, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to achieve the effect of reducing the ignition point and efficient utilization

Inactive Publication Date: 2008-02-06
HANERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For γ-Al 2 o 3 As a carrier, a catalyst for methanol and natural gas combustion that supports noble metals and has a non-uniform distribution of active components in the catalyst has not yet been reported.

Method used

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Experimental program
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Effect test

Embodiment 1

[0050] Prepare rhodium sulfate, platinum nitrate, cobalt chloride, nickel nitrate, chromium sulfate solution, the concentration is 0.02mol / L solution, and prepare 0.1mol / L Na at the same time 2 CO 3 solution, the dried alumina pellets were impregnated in Na 2 CO 3 solution, the immersion time was 60 minutes, and the impregnated alumina pellets were dried in an oven at 160°C for 5 minutes; the dried γ-Al 2 o 3 Immerse the pellets in the metal salt solution mixed with equal volumes above for 10 minutes. During the impregnation process, use hydrochloric acid and sodium hydroxide to control the pH value of the solution to 7; take out the impregnated alumina pellets and dry them at 80°C for 4 hours ; the dried γ-A1 2 o 3 The pellets were calcined at 500°C for 4 hours to prepare the catalyst. The weight of metal oxide in the catalyst accounts for 5%.

Embodiment 2

[0052] Rhodium chloride is made into a solution with a concentration of 3mol / L; at the same time, 1mol / L of Na 2 CO 3 solution, the dried alumina pellets were impregnated in NaHCO 3 In the solution, the immersion time is 80 minutes, and the above-mentioned impregnated alumina pellets are dried in an oven at 120°C for 5 minutes; the dried alumina pellets are immersed in the above-mentioned equal volume mixed metal salt solution, The time is 20 minutes, and the pH value of the solution is controlled by hydrochloric acid and sodium hydroxide during the impregnation process; the impregnated alumina pellets are taken out and dried at 100°C for 4 hours; the dried alumina pellets are roasted at 600°C for 3 hours to obtain catalyst. The weight of metal oxide in the catalyst accounts for 2%.

Embodiment 3

[0054] Make nickel chloride into a solution with a concentration of 0.005mol / L, chromium nitrate and cobalt sulfate into a solution with a concentration of 0.1mol / L, mix the three solutions in any ratio, and prepare 1.2mol / L Na at the same time 2 CO 3 solution, the dried alumina pellets were impregnated in Na 2 CO 3 In the solution, the immersion time is 80 minutes, and the above-mentioned impregnated alumina pellets are dried in an oven at 100°C for 5 minutes; the dried alumina pellets are immersed in the above-mentioned mixed metal salt solution, and the immersion time is For 20 minutes, use hydrochloric acid and sodium hydroxide to control the pH value of the solution to 6 during the impregnation process; take out the impregnated alumina pellets and dry them at 100°C for 4 hours; roast the dried alumina pellets at 600°C for 3 hours to prepare the catalyst. The weight of metal oxide in the catalyst accounts for 1%.

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Abstract

The present invention discloses a non-uniformly distributed combustion catalyst and the preparation method thereof. The present invention belongs to the catalyst field, and in particular relates to the catalytic combustion catalyst product and the production method. The technical problem solved by the present invention is to provide the catalyst product with non-uniformly distributed active components and the preparation method. Another objective of the present invention is to apply the catalyst with non-uniformly distributed active components to the catalytic combustion reaction of methanol, methane and natural gas. The active components of the catalyst consist of one species or a plurality of species in palladium oxide, rhodium oxide, platinum oxide, cobalt oxide, nickel oxide and chromium oxide, and the active components are non-uniformly distributed in the catalyst in an eggshell-shape, of which the content occupies the 0.01-5 percent of the catalyst weight; the weight of an alumina carries occupies 95-99.99 percent. The present invention can decrease the combustion point of fuel, and can make the active component of precious metals utilized with high efficiency.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to catalytic combustion catalyst products and production methods thereof. Background technique [0002] Most of the catalysts currently used in industry are supported catalysts, and their active components are mainly noble metals, such as palladium or platinum, etc., and their active components are almost evenly distributed in the catalyst. In recent years, experiments have proved that many heterogeneously distributed catalysts have better activity, selectivity and longer lifetime than homogeneous catalysts. [0003] Chinese patent 01133374.X adopts the method that the precious metal active component Pt is distributed on the outer surface of the honeycomb ceramic carrier coating by the impregnation method through the competitive adsorption of organic acids. The coating composition of the honeycomb ceramic carrier is by weight percentage: active Al 2 o 3 20%~80%,TiO 2 10%~40%, CeO 2 5%~3...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J23/46B01J23/755
Inventor 肖钢侯晓峰周帅林张新锋崔冰冰
Owner HANERGY TECH
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