Redox preparation process of an oxygen carrier for a chemical looping process

Abstract

The invention is directed to a process for the preparation of an oxygen carrier for a chemical looping process comprising: (a) providing a material A comprising at least one first transition metal and / or an oxide of the at least one first transition metal, wherein the at least one first transition metal is selected from one or more of chemical element groups 6-11 of the Periodic System, wherein the at least one first transition metal and / or oxide of at least one first transition metal is optionally supported on one or more support materials, (b) subjecting material A to a reaction with H2 to cause at least partial reduction of the at least one first transition metal and / or at least one first transition metal oxide to form a reduced material B, (c) treating reduced material B with a solution of a salt of at least one second transition metal, wherein the at least one second transition metal is selected such that it has a standard reduction potential that is larger than a standard reduction potential of the first transition metal, wherein a portion of the at least one first transition metal in the reduced material B is replaced by the at least one second transition metal, wherein a molar ratio of the at least one first transition metal with respect to the at least one second transition metal in the reduced material B ranges between 2:1 and 100:1, and (d) washing and optionally drying the thus obtained oxygen carrier. The invention also relates to an oxygen carrier obtained with this method and to a method for regeneration of the oxygen carrier using steam.

Description

technical field [0001] The present invention relates to a method for preparing oxygen carriers for chemical chain processes. Background technique [0002] Carbon dioxide emissions from combustion and other chemical processes severely impact the environment. Therefore, alternative methods have been developed in which these CO 2 emission. In current and emerging CO 2 Among capture technologies, chemical looping processes are often used as 2 Particularly promising approaches for capture and energy generation are mentioned. [0003] In general, chemical chaining is used to refer to cyclic processes using solid materials that cycle the oxygen required to convert fuels. Such solid materials are therefore called "oxygen carriers" and traditionally consist of metal oxide particles. In order to close the chemical chain, the oxygen-depleted solid oxygen carrier must be reoxidized (regenerated) before a new cycle can start. Depending on the focus of the chemical looping process,...

AI Technical Summary

Problems solved by technology

[0014] A disadvantage of the methods described in WO 2014 / 155116 and WO 2018 / 115344 is the risk of particle aggregation of the oxygen carrier material, which has an adverse effect on the impregnation of the particles with redox materials

Furthermore, these methods involve two calcination steps, which makes the method energy intensive and thus expensive

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