A kind of preparation method of porous nickel supported perovskite catalyst

Abstract

The invention provides a method for preparing a porous nickel-loaded perovskite catalyst for CO preferential oxidation, the catalyst is a monolithic three-dimensional porous structure catalyst, the catalyst has excellent mechanical strength and high heat transfer performance , Low local hot spots, effectively improve the solid-phase mass transfer process, and have significant CO-PROX catalytic performance.

Description

technical field [0001] The invention relates to a preparation method of a porous nickel-supported perovskite catalyst for CO preferential oxidation, belonging to the field of electrochemical dealloying and fuel cells, and in particular to the field of hydrogen purification treatment of fuel cells. [0002] technical background [0003] First of all, the reactants of fuel cells are hydrogen and anode. As an efficient, clean and renewable secondary energy, hydrogen energy has entered various fields of social life, and the demand for hydrogen energy has been increasing in recent years. At present, the main hydrogen production technology fields include fossil fuel hydrogen production (methanol, ethanol, natural gas), biological hydrogen production, and water electrolysis hydrogen production. The main way of fuel cell hydrogen production technology is to reform or partially oxidize hydrocarbons (methanol, ethanol, natural gas, etc.), and then go through a water-gas shift reaction....

AI Technical Summary

Problems solved by technology

The preparation process includes: using mesoporous SiO2 as a hard template to prepare LaFe1-yCuyO3 with a high specific surface area; impregnating the cobalt nitrate solution on the LaFe1-yCuyO3 carrier, drying and roasting to obtain a catalyst precursor; reducing the precursor to obtain a high specific surface area LaFeO3-supported CuCo alloy catalyst with lanthanum oxide as auxiliary agent has the following problems: (1) The preparation method of silicon oxide is prepared by template method, which leads to the poor mechanical strength of the silicon oxide in this application, Usually they are in powder state, which is difficult to be used as a bulk carrier; (2) the one-step complexation of citric acid will expand during the reaction process, and the reactants impregnated in the mesoporous silica will obviously break the silica carrier, which is also the reason for this The specific surface area of ​​silicon oxide prepared by the patented template method is as high as 500 m 2 / g, and get LaFeO 3 The specific surface area of ​​the catalyst support is only 120 m 2 key reason for / g

[0006] Based on the above-mentioned foreign literature and patent status, it is found that the following problems exist in the prior art: (1) the bulk monolithic catalyst carrier is mainly concentrated in natural porous materials, and the purification or pretreatment process of the natural materials is complicated; (2) the existing The monolithic catalyst prepared by the reverse template method needs multiple reverse electroplating, the process is complicated, and it is difficult for industrial application; (3) The obtained perovskite catalysts are all in powder form, and no perovskite monolithic catalysts have been used in laboratories or industries so far. application on

The main preparation methods include template method, hydrothermal method, foaming method, sol-gel method and molten salt method, etc., because the method of chemical synthesis is usually involved in the synthesis process, the preparation steps are numerous and the process is relatively complicated, which leads to the current The synthesis cost of some hierarchical porous materials is high, the control of the pore structure is difficult, the process stability is poor, and it is difficult to carry out large-scale production

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