Abstract
The effects of SiO2/Al2O3 ratio of HZSM-5 on the tar quality and coke formation during catalytic upgrading of coal pyrolysis volatiles were investigated. The results showed that the carbon deposition amount decreased with the increase of the SiO2/Al2O3 ratio of HZSM-5 due to the decrease of strong and weak acid amount. When the SiO2/Al2O3 ratio increased from 23 to 310, the carbon deposition amount decreased from 120.1 mg/g-catalyst to 23.9 mg/g-catalyst. Moreover, the higher ratio of strong and weak acid amount led tolighter fraction in tar. With the decrease of SiO2/Al2O3 ratio, the acid strength was enhanced so that the aromatics content in the tars decreased, indicating that the stronger acidic sites promoted the dehydrogenation, cyclization and aromatization reactions of volatiles, thus leading to higher yield of aromatics during catalytic coal pyrolysis.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
