GAO Daoxing;DOU Binlin;ZHANG Hua;LUO Chuanqi;DU Jinbo;

• 1:Energy and Power Engineering Institute
• 2:University of Shanghai for Science and Technology

Abstract：

It is of great significance to develop a new method for hydrogen production and syngas production that utilizes oxygen carrier catalysts to directly decompose water to produce pure hydrogen in one stepand couple it with biomass thermal conversion. Iron-based oxygen carriers doped with Ce-Ni were prepared by metal chelating sol-gel method. Pure hydrogen and hydrogen-rich synthesis gas were prepared by chemical looping water decomposition coupled with acetic acid thermal decomposition. Firstly, under the action of oxidized oxygen carriers, acetic acid catalyzed thermal decomposition to produce hydrogen-rich syngas. And the oxygen carrier was reduced to realize the migration of lattice oxygen in the oxygen carrier, and the thermal decomposition process was strengthened by in-situ CO_2 adsorption. Secondly, hydrogen production was achieved through the iron steam process using the reduced oxygen carrier with water. It is found that the in-situ CO_2 adsorption is enhanced during the catalytic thermal decomposition of acetic acid, which can improve the purity of H_2 in syngas and reduce carbon deposition. Compared with undoped pure iron oxide and blank quartz samples, the Fe-based oxygen carrier doped with appropriate amount of Ce and Ni has obvious hydrogen production effect. With the increase of Ce and Ni, the amount of CO_2 and CO produced in the acetic acid decomposition stage decrease, while H_2 increases firstly and then decreases during water decomposition. The optimum molar ratio of oxygen carrier Fe, Ce and Ni is 100∶10∶3.The addition of CO_2 adsorbent with different mass ratio of oxygen carrier can effectively reduce the amount of CO_2 and CO in syngas, and the best mass ratio is 1∶2.Under this condition, the syngas composition of H_2 is increased by 11.96%-26.17%, CO_2 is reduced by 22.85%-49.28%, CO is reduced by 29.18%-34.05%, and the oxygen carriers remain good stability after 15 cycles.

Key Words： metal-chelated sol-gel method;hydrogen production by chemical looping water decomposition;CO_2 adsorbent;thermal decomposition of acetic acid;synthesis gas

Abstract:

Keywords:

Foundation: 国家自然科学基金资助项目(51876130)

Authors: GAO Daoxing;DOU Binlin;ZHANG Hua;LUO Chuanqi;DU Jinbo;

DOI: 10.13226/j.issn.1006-6772.CN22121401

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