Deoxidating catalyst with core-shell structure, and preparation method and application of deoxidating catalyst

Abstract

The invention provides a deoxidating catalyst with a core-shell structure, and belongs to the technical field of catalysis of oxygen-bearing coal bed gas. A core portion of the deoxidating catalyst comprises CuO and CeO2, and a shell portion of the deoxidating catalyst comprises TiO2. A shell is used for protecting active ingredients of metal Cu in an inner layer, and sintering of the active ingredients can be prevented effectively; the probability of collision between reaction molecules and active centers is increased through confinement effect of the shell, and low-temperature catalytic deoxidation activity and high-temperature performance of the catalyst are improved; the catalyst has the advantages of high heat stability, high low-temperature activity, ignition temperature being 400 DEG C, wide deoxidation temperature window (400-800 DEG C), high wear strength and service life as long as 1000h; the deoxidating catalyst has high stability to impurity ingredients such as water, carbon dioxide, sulfide and nitration products and high mechanical strength, can meet application requirements of fluidized beds, and has the advantages of high gas treatment quantity, high heat transfer performance and easiness in operation after being combined with a deoxidation process of the fluidized beds.

Description

technical field [0001] The invention relates to the technical field of oxygen-containing coal bed gas catalysis, in particular to an oxygen-containing coal bed gas deoxidation catalyst with a core-shell structure. Background technique [0002] my country is rich in coalbed methane resources, ranking third in the world. The national shallow coalbed methane resources are 36.8 trillion cubic meters, and the calorific value is equivalent to 52 billion tons of standard coal. In today's increasingly tight energy environment, coalbed methane, as a high-quality, efficient and clean energy, can be used for power generation, heating, residential life, and vehicle fuel, etc., and its large-scale utilization has huge economic value. [0003] Oxygen-containing coalbed methane is an important part of coalbed methane resources. It mainly refers to the coalbed methane extracted from coal bodies and surrounding rocks during the coal mining process. This kind of coalbed methane is diluted by ...

AI Technical Summary

Problems solved by technology

[0016] At present, the main catalytic combustion deoxidation catalysts can be divided into the following categories: as disclosed in CN1495247A and CN101664679A, precious metal catalytic combustion deoxidation catalysts such as Pt and Pd have high catalytic activity, low reaction temperature, and the oxygen in the gas after deoxidation can be basically removed. The disadvantages of these deoxidation catalysts are that noble metals are easy to sinter at high temperatures, have poor high temperature resistance, and have low deoxidation activity at low temperatures. CN101139239A discloses a catalyst with strong sulfur resistance Co-based catalysts have the characteristics of strong sulfur resistance, but their reaction temperature is high, which has great limitations

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