Production of high-quality pyrolysis product by microwave-assisted catalytic pyrolysis of wood waste and application of biochar

Wood waste is employed as the feedstock for production of high-quality pyrolysis prod-ucts such as bio-oil, bio-gas and biochar by microwave pyrolysis using ZnCl2 and Fe(NO3)3 as addi-tive at 400-800 degrees C. Pyrolysis temperature influences the yield of the pyrolysis products, which indicates that the yield of bio-gas increases and the yield of biochar decreases as pyrolysis temper-ature increases. The yield of the bio-oil is little influenced by pyrolysis temperature, which is restrained in the existence of ZnCl2 and Fe(NO3)3. ZnCl2 increases the furfural content in bio-oil. While Fe(NO3)3 promotes H2 production during pyrolysis process. The maximum heating value of bio-gas produced at 800 degrees C is 12.26 MJ/Nm3. The added ZnCl2 and Fe(NO3)3 increase the yield of the biochar, which also promote the formation of pore structure of biochar. The ZnCl2 and Fe (NO3)3 are converted into ZnO and Fe3O4 onto biochar after pyrolysis, which could be used as the absorbent and photocatalyst for methyl orange removal.(c) 2023 The Author(s). Published by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

Wood waste is used as a feedstock for the production of high-quality pyrolysis products including bio-oil, bio-gas, and biochar through microwave pyrolysis with the addition of ZnCl2 and Fe(NO3)3. The yield of pyrolysis products is influenced by the pyrolysis temperature, with an increase in bio-gas and a decrease in biochar yield as the temperature rises. The presence of ZnCl2 and Fe(NO3)3 has little effect on the yield of bio-oil. The addition of ZnCl2 increases the furfural content in bio-oil, while Fe(NO3)3 promotes H2 production. The maximum heating value of bio-gas produced at 800 degrees C is 12.26 MJ/Nm3. The addition of ZnCl2 and Fe(NO3)3 increases the biochar yield and promotes the formation of a pore structure. After pyrolysis, ZnCl2 and Fe(NO3)3 are converted into ZnO and Fe3O4 on the biochar, which can be used for the removal of methyl orange as an absorbent and photocatalyst. (c) 2023 The Author(s). Published by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).