Enhanced aromatic yield from catalytic pyrolysis of pine wood via ultrasonic assisted Mo modified HZSM-5. (May 2023) - Yu, Jiajun
Abstract: Catalytic pyrolysis of biomass over HZSM-5 can produce aromatic hydrocarbons, but it also produces a lot of by-products and causes rapid coking of the catalyst. Mo/HZSM-5 was modified through ultrasonic treatment to enhance the catalytic efficiency and mitigate the coking in this study. It is found that ultrasonic treatment is conducive to the diffusion of more Mo species into the channel of HZSM-5 and enhance the interaction between molybdenum species and HZSM-5 acid sites, which promoted the synergistic catalysis of Mo species and HZSM-5 and increased the yield of aromatic hydrocarbons. The activity of the ultrasonic Mo modified catalyst increased 54%, which led to aromatic carbon production increasing from 5.09 mmol∙gcat −1 to 7.82 mmol∙gcat −1 . By adjusting the WHSV, the carbon yield of aromatic can reach 21.7%. The regeneration performance of Ul-Mo/HZSM-5 is excellent, and the activity does not decrease after regenerating seven times. Graphical abstract: Image 1 Highlights: Ultrasonic assisted Mo modified HZSM-5 for catalytic pyrolysis of pine. Ultrasonic treatment promoted the diffusion of Mo in HZSM-5 channel. Ultrasonic treatment optimized the coordination between Mo and HZSM-5 acid sites. The yield of aromatics from catalytic pyrolysis of pine wood increased by 26.6%. Ul-Mo/HZSM-5 improves the catalytic efficiency and mitigates the coking.