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

Авторы: Gang Rao, Jing'ai Shao, Xu Chen, Liwen Fu, Xiong Zhang, Junjie Zhang, Qiancan Wang, Кривошапкин П.В., Кривошапкина Е.Ф., Hanping Chen


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 temperatures 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 °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 °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 conversion utilization.