生物质化学链气化过程中甲苯转化OA

Biomass tar is a significant challenge in biomass gasification technology.Biomass chemical looping gasification technology can mitigate tar formation through the catalytic oxidation of oxygen carriers,and the performance of oxygen carriers is crucial for effective tar conversion.Various LaM(M=Fe,Ni,Co,Mn,Cu)oxygen carriers were prepared using the sol-gel method.Experiments on chemical looping conversion of toluene,serving as a model compound for biomass tar,were carried out in a fixed bed reactor.The effects of oxygen carrier type,steam and molar ratio of steam to carbon in toluene nS/C on gas composition,toluene conversion,C1 and H2 yields were investigated.The results show that compared with LaCu,LaMn and LaCo,LaFe and LaNi exhibit superior performance in the partial oxidation and catalytic conversion of toluene.The synergistic effect of Fe and Ni in LaFe1-xNix makes a smaller grain and some new compounds like LaFe0.9Ni0.1O3 which can further promote toluene conversion.However,due to insufficient oxygen supply,serious carbon deposition occurs.The addition of steam significantly promotes tar reforming and coke gasification,reducing carbon deposition and greatly improving C1 and H2 yields.For LaFe0.6Ni0.4,when the steam-to-carbon ratio is increased to 1.6,the C,yield reaches 95.65％,the carbon deposition ratio is less than 0.18％,and the H2 yield reaches 264.53％.Multiple cycle experiments indicate that LaFe0.6Ni0.4 exhibits good reactivity stability.