Preparation of hydrogen-rich syngas by Fe-Ca-Ce catalyzed biomass pyrolysis: Take hawthorn residue as an example

In this work, the effects of pyrolysis temperature and Fe, Fe-Ca, Fe-Ca-Ce catalysts and loadings on the pyrolysis of hawthorn residue as raw material were investigated in a fixed-bed reactor, and the effects of impregnation and co-precipitation methods on the yield of pyrolysis gas were studied. The results showed that the H₂ increased from 10.40 mL/g to 27.64 mL/g when the pyrolysis temperature increased from 500 ℃ to 700 ℃, and the H₂ yield increased from 27.64 mL/g to 46.16 mL/g when the Fe loading was 7 wt.%. The addition of Ca to Fe effectively increased the H₂ yield, and when the Ca loading increased to 2.0 wt.%, the H₂ yield increased to 69.53 mL/g. The preparation of Fe and Fe-Ca catalysts by co-precipitation method was beneficial to reduce the CO₂ yield. However, the H₂ yield decreased from 69.53 mL/g to 50.18 mL/g after the addition of Ce in Fe-Ca.