La, Mn modified Pd/gamma-Al2O3 catalyst and preparation method thereof

A catalyst and modification technology, applied in the field of low calorific value gas catalytic combustion, can solve the problems of difficult large-scale industrial application, complicated preparation methods, etc., and achieve the effects of long catalyst life, simple preparation process and low light-off temperature.

Inactive Publication Date: 2009-09-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN 1332035A discloses a supported noble metal complete combustion catalyst and its preparation method. This patent only involves combustion catalysts in the field of natural gas. The preparation method is relatively complicated and difficult to be applied in large-scale industrialization

Method used

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  • La, Mn modified Pd/gamma-Al2O3 catalyst and preparation method thereof
  • La, Mn modified Pd/gamma-Al2O3 catalyst and preparation method thereof
  • La, Mn modified Pd/gamma-Al2O3 catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Preparation of 0.1Pd / La / Al 2 o 3

[0018] Determine 10g γ-Al 2 o 3 The water absorption capacity is 8.4 ml, weigh 6 g of lanthanum nitrate hexahydrate and dissolve it in 8.4 ml of deionized water, and mix it with 10 g of γ-Al 2 o 3 Mix evenly, dry at 120°C overnight after standing for two hours, and bake at 800°C in a muffle furnace for 4 hours. Obtain 12.5g intermediate carrier La / Al 2 o 3 ; with 8.4 mL H 2 PdCl 4 Solution (PdCl 2 0.2g) impregnated La / Al 2 o 3 , and then cleaned until it does not contain Cl ions, dried overnight at 120°C, and finally placed in a muffle furnace and roasted at 1000°C for 4 hours to obtain the desired catalyst Pd / La / Al 2 o 3 , where the mass percent of the composition is: 80% γ-Al 2 o 3 , 0.1% Pd, 19.9% ​​La.

Embodiment 2

[0019] Embodiment 2: Preparation of 0.1Pd / Mn / Al 2 o 3

[0020] Determine 10g γ-Al 2 o 3 The water absorption capacity is 8.4ml, weigh 8.12g manganese nitrate and dissolve it in 8.4ml deionized water, and mix it with 10gγ-Al 2 o 3 Mix evenly, dry at 120°C overnight after standing for two hours, and bake at 800°C in a muffle furnace for 4 hours. Obtain 12.5g intermediate carrier Mn / Al 2 o 3 ; with 8.4 mL H 2 PdCl 4 Solution (PdCl 2 0.2g) impregnated Mn / Al 2 o 3 , washed to no Cl ions, dried at 120°C overnight, and finally placed in a muffle furnace for 4 hours at 1000°C to calcinate to obtain the desired catalyst. 0.1Pd / Mn / Al 2 o 3 The mass percentage of the composition is: 80% γ-Al 2 o 3 , 0.1% Pd, 19.9% ​​Mn.

Embodiment 3

[0021] Example 3: Preparation of 0.1Pd / LaMnAl 11 o 19

[0022] Determine 10g Al 2 o 3 The water absorption capacity is 8.4 ml, weigh 3 g of lanthanum nitrate hexahydrate and 4.06 g of manganese nitrate into 8.4 ml of deionized water, and mix with 10 g of γ-Al 2 o 3 Mix evenly, dry at 120°C overnight after standing for two hours, and bake at 1000°C in a muffle furnace for 4 hours. 12.5 g of intermediate support are obtained. Using 8.4 ml H 2 PdCl 4 Solution (PdCl 2 0.2g) to impregnate the intermediate support, then wash it to contain no Cl ions, dry it overnight at 120°C, and finally place it in a muffle furnace and bake it at 1000°C for 4 hours to obtain the desired catalyst 0.1Pd / LaMnAl 11 o 19 ; The mass percentage of the composition is: 80% γ-Al 2 o 3 And 0.1% noble metal Pd, 9.95% La, 9.95% Mn.

[0023] Prepared 0.1Pd / Mn / Al 2 o 3 , 0.1Pd / La / Al 2 o 3 , 0.1Pd / LaMnAl 11 o 19 The low-temperature ignition activity and high-temperature stability tests of catal...

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Abstract

The invention provides a La, Mn modified Pd / gamma-Al2O No.[3] catalyst. The catalyst comprises the following components by mass percentage: 60 to 80 percent of gamma-Al2O3, 19.9 to 39.5 percent of La or Mn or the combination of the La and the Mn, and the balance of noble metal Pd. The invention also provides a method for preparing the catalyst. The method comprises the following steps: evenly mixing manganese nitrate or lanthanum nitrate or a mixed solution of the manganese nitrate and the lanthanum nitrate with the gamma-Al2O3, and drying and baking the mixture to obtain an intermediate catalyst; and immersing the intermediate catalyst by a H2PdCl4 solution, then cleaning the intermediate catalyst until the intermediate catalyst does not contain Cl ions, and drying and baking the intermediate catalyst again to obtain the catalyst. The prepared catalyst has better low temperature activity and can be widely and industrially applied to the catalytic combustion of low heat value gas.

Description

technical field [0001] The invention relates to the technical field of catalytic combustion of low calorific value gas, in particular to a catalyst for promoting combustion and a preparation method thereof. Background technique [0002] In biomass energy utilization technology, biomass integrated gasification combined cycle (B / IGCC) based on biomass gasification is suitable for large-scale development and utilization of biomass resources, and has high power generation efficiency, which is the main way of industrial application of biomass in the future . Under the traditional combustion method of biomass gasification gas, it is difficult to ignite and control the combustion, and it is difficult to achieve stable combustion. This situation can be improved by catalytic combustion. At present, the patents applied for catalytic combustion mainly focus on the combustion technology of natural gas (with methane as the main gas component), and there are few researches on the cataly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/656C10L10/00
Inventor 孙路石胡松秦晓楠向军苏胜
Owner HUAZHONG UNIV OF SCI & TECH
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