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Foam ceramics with excellent pore structure were prepared by using mineral diatomite with abundant reserves. It is used for catalytic reforming of biomass pyrolysis gas. Fe2O3and CeCl3were loaded on foam ceramics as active materials to explore the effect of using them as catalyst supports. The experimental results show that diatomite-based foam ceramics (DBFC) have good catalytic performance. At 750 ℃, the gas yield was increased by 6.5% and the liquid yield was reduced by 16.04% under the catalysis of diatomite-based foam ceramics. After repeated use tests, the results show that the anti-deactivation activity is higher, and the catalytic effect of the second use is better than that of the third use, but still better than that of the first use. When DBFC is used as catalyst carrier, Fe2O3loaded on it has better catalytic performance. At 750 ℃, the gas yield increased by 13.14% and the liquid yield decreased by 33.54%. The analysis of gas phase products shows that the use of DBFC will increase H2, CH4, and CO2in the syngas, but will reduce the yield of CO, and the increase of CO2yield is greater than that of H2and CH4. Fe2O3loading leads to the highest gas productivity, but the proportion of CO2in syngas is also the highest and LHV is the lowest.

The development of efficient tar degradation catalyst is the research focus in the field of biomass thermal conversion. Considering the characteristics of diatomite, such as large specific surface area and stable chemical properties, a tar catalytic degradation technology using diatomite as catalyst was proposed. The degradation of pine pellets pyrolysis volatiles at different temperatures catalyzed by diatomite was studied. The results showed that diatomite could catalyze the degradation of condensable gas in pine pellet pyrolysis volatiles, and the liquid yield decreased, while the gas yield increased. Compared with no catalyst, the gas yield increased by 12.96% and the liquid yield decreased by 13.01% at 850 ℃. Adding bentonite into diatomite can effectively improve the mechanical strength of the catalyst. Compared with diatomite, bentonite will not reduce the catalytic degradation ability of liquid products. Under the catalysis of diatomite, the low calorific value and the content of each component of the gas product changed little.