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

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...

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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.

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