Acidity and cracking activity changes during coke deactivation of ultrastable Y zeolite

In situ fast pyrolysis of biomass with zeolite catalysts for bioaromatics/gasoline production: A review

“…These products diffused into the zeolite pores and underwent a series of reactions including hydrocracking, dehydrogenation, polymerization and oligomerization and during which they consequently blocked the catalyst's pores. Consistent with earlier studies involving hydrocarbons [78,79], the reduction in the amount of acids sites in the H-USY catalyst decreased the yield of the desired reaction products (i.e., aromatics in this case); however, catalyst regeneration between 550 and 650°C by heating in air significantly restored the catalyst's textural features and improved the catalytic activity.…”

Pyrolysis of waste tyres: The influence of USY catalyst/tyre ratio on products

“…USY catalyst was reported to crack hexane and benzene in Refs. [22,23]. The data also represented that the cracking activity was increased with increasing catalyst/tyre ratio, and the high activity of USY catalyst resulted in very low yield of oil.…”

TG/FT-IR analysis of HZSM5 and HUSY deactivation during the catalytic pyrolysis of polyethylene

“…One of the main deactivation processes related to the use of zeolites is coke deposition. On account of the great importance of this process, some authors have centred their effort on its study [1][2][3].…”