Study on biomass adsorption-enhanced steam gasification for hydrogen production based on dual-effect catalyst

In this study, in order to achieve CO₂ capture under high-temperature conditions and obtain hydrogen from biomass, a dual-effect catalyst Ni(x)-Na₂ZrO₃, possessing both catalytic and high-temperature CO₂ adsorption capabilities, was prepared and applied in the biomass steam reforming reaction. The investigation focused on the impact of gasification temperature, steam to carbon (S/C) ratio, and Ni loading ratio on the production of hydrogen-rich syngas via biomass enhanced steam gasification over the catalysts. By thermogravimetric analysis, the catalyst exhibited a remarkable high-temperature CO₂ adsorption capability at 900°C and cyclic stability. The orthogonal experiment was conducted for the reaction characteristics of the biomass adsorption-enhanced steam gasification over the dual-effect Ni(x)-Na₂ZrO₃ catalyst. Through the analysis of the fitting formula, the catalyst successfully demonstrated promotional effect on the biomass reforming reaction. When the gasification temperature was 950°C, S/C ratio was 9 and Ni loading ratio was 7.7 wt%, the hydrogen yield reached 0.95 m³/kg, and carbon deposition rate was almost 0.