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Composite catalyst used for reforming hydrogen prodn. using methane and water vapor as raw material, preparing process and use thereof

A composite catalyst, methane steam technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. Effects of design stability and cycle stability

Active Publication Date: 2008-07-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] However, in the existing carbon dioxide adsorption enhanced steam reforming hydrogen production technology, the catalyst and the adsorbent are simply packed in the same reactor, and the two are not integrated to give full play to the synergistic effect of the two.

Method used

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  • Composite catalyst used for reforming hydrogen prodn. using methane and water vapor as raw material, preparing process and use thereof
  • Composite catalyst used for reforming hydrogen prodn. using methane and water vapor as raw material, preparing process and use thereof
  • Composite catalyst used for reforming hydrogen prodn. using methane and water vapor as raw material, preparing process and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1 Composite catalyst preparation

[0063] First add 15g of nano-calcium carbonate powder into the beaker, then add 70ml of 10% solid content alumina-hydrosol, add a small amount of water and mix well, then add 15g of nickel carbonate powder, mix well, infrared dry, extrude, and dry , Composite catalyst CA-1 prepared by calcining. see figure 1 , figure 2 , the catalyst was characterized by transmission electron microscope TEM analysis, and the results showed that the composite catalyst after thermal decomposition pretreatment had obvious deep micropores, and the calcium carbonate generated by CaO adsorbed carbon dioxide after thermal decomposition pretreatment had a spherical structure.

[0064] The catalyst was characterized by XRD, and the results showed that the catalytic components in the composite catalyst were nickel and nickel oxide, and the activity was good. Calcium as CaCO 3 and some Ca(OH) 2 Exist, part of calcium and aluminum form Ca 12 al ...

Embodiment 2

[0065] Embodiment 2 composite catalyst preparation

[0066] First add 10 g of micron calcium hydroxide powder into the beaker, then add 70 ml of alumina hydrosol with a solid content of 8%, stir and mix. Then add nickel carbonate powder of less than 100 meshes, mix well, infrared dry, extrude, dry and calcinate to obtain composite catalyst CA-2.

Embodiment 3

[0067] Embodiment 3 composite catalyst preparation

[0068] First add 5g of nano-calcium carbonate powder into the beaker, then add 35ml of 10% solid content alumina hydrosol, add a small amount of water, stir and mix well, add 10ml of saturated nickel nitrate salt solution, mix well, spray dry, granulate and calcinate , Obtain composite catalyst powder CA-3 with 20-100 microns.

[0069] The catalyst was characterized by XRD, and the results showed that the catalytic component in the composite catalyst was nickel, and the activity was better. Calcium as CaCO 3 and some Ca(OH) 2 Exist, part of calcium and aluminum form Ca 12 al 14 o 33 structure, thereby enhancing the strength of the catalyst and increasing the stability of the adsorption and desorption recycling process.

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Abstract

A composite catalyst for preparing hydrogen by reforming the CO2 adsorbed and intensified methane vapor is proportionally prepared from CaO, NiO and Al2O3 as carrier. It features that the heat generated by reaction between calcium oxide and CO2 is used to promote said reforming reaction. Its preparing process is also disclosed.

Description

technical field [0001] The invention provides a composite catalyst containing active nickel directly with an adsorbent containing CaO as the main component to prepare a composite catalyst with catalytic function and carbon dioxide adsorption function, which is used to strengthen the hydrogen production process of steam reforming of methane . Background technique [0002] The steam methane reforming reaction (Steam Methane Reforming, referred to as SMR) is a strong endothermic reaction. The catalyst used in the methane steam reforming reaction commonly used in industry is a porous material catalyst made of nickel as the active component, alumina as the carrier, and a certain amount of co-catalyst added through the precipitation method, impregnation method and mixing method. The catalyst is used in a fixed bed reactor, the reaction conditions are water / carbon ratio of 2.5-4.5, the reaction pressure is 4.5MPa, the first-stage conversion temperature is 600-800°C, the second-sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/835B01J23/78
CPCY02P20/52
Inventor 吴素芳贺隽汪燮卿
Owner CHINA PETROLEUM & CHEM CORP
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