A new strategy of preparing high-value products by co-pyrolysis of bamboo and ZIF-8

To improve the pore structure of biochar, the H2 yield of gas, and the quality of bio-oil in biomass pyrolysis, a new pyrolysis strategy of co-pyrolyzing bamboo and Zeolitic Imidazolate Frameworks (ZIF-8) at different tem-peratures and mixing ratios was proposed. Results showed that ZIF-8 blending improved the quality of pyrolytic products. For biochar, the specific surface area was increased tenfold from 49.63 m2/g for raw bamboo to 557.37 m2/g with a 4:1 mass ratio of bamboo to ZIF-8 at 900 degrees C. And hierarchical porous biochars were formed. For gas, the H2 yield was increased significantly from 4.35 mmol/g (32.84 vol%) for raw bamboo to 7.87 mmol/g (43.73 vol%) with a 4:1 mass ratio of bamboo to ZIF-8 at 900 degrees C. For bio-oil, ZIF-8 blending promoted the conversion of bamboo to acetic acids, furans, and cyclopentanones, while inhibiting the formation of polyaromatic compounds, showing that ZIF-8 could enhance the secondary cracking of volatiles and promote the branch chain fracture, dehydrogenation, ring-opening and decarbonylation of bamboo. These results indicated that ZIF-8 had excellent effects on bamboo pyrolysis to produce high-value products, and it was enlightening for biomass thermal con-version utilization.

Automated summary

A new pyrolysis strategy of co-pyrolyzing bamboo and Zeolitic Imidazolate Frameworks (ZIF-8) was proposed to improve the pore structure of biochar, H2 yield of gas, and quality of bio-oil in biomass pyrolysis. The blending of ZIF-8 was found to enhance the specific surface area of biochar, increase H2 yield, and promote the conversion of bamboo to valuable compounds in bio-oil. These results suggest that ZIF-8 has excellent effects on bamboo pyrolysis and can be enlightening for biomass thermal conversion utilization.