Y zeoliteis one of the most important membersin zeolite family. Its application in the FCC and hydrocracking processes has brought a revolutionary breakthrough to the petroleum refining industry. Generally, the primary active component of industrial cracking catalysts is ultra-stable Y (USY) zeolite, which is prepared by post-synthesis dealumination with conventional zeolite Y as precursor. Although dealumination treatment can enhance the framework SiO2/Al2O3(SAR) and (hydro)thermal stability, and introduce mesoporosity, it is complex and time-/energy-consuming.Additionally, the formation of dealumination gradient is inevitable, which is unfavorable for catalytic applications. So, the directly synthesis mesoporous high-silica zeolite Y is an ideal strategy.
Recently, mesoporoushigh-silicazeolite Y (MSY)with high (hydro)thermal stability has been successfully synthesized,which possesseslarger acid concentration and stronger acid strength than USY, and exhibitssuperior catalytic performance in the cracking of hydrocarbons and industrial heavy oil.
This work was published in Chinese journal of catalysis on May 20th, 2022(43).
The amount of mesoporgen, adding order and gel SAR were explored. The results showed that,external surface area, mesopore volume and SAR increased with the increasing addition of mesoporogen. SEM and TEM results showed that MSY present typical octahedral morphology,abundant mesopores and excellent thermal and hydrothermal stability. Compared with commercial USY, MSY possessed obviously large acid amount and high acid strength. MSY exhibited good catalytic activity in the cracking of bulky TIPB with slow deactivation rate, high activity and cracking depth. More importantly, MSY10.7-based catalyst after 800oC hydrothermal aging treatment displays superior conversion and gasoline yield thanindustrial FCC catalyst for thecrackingofheavy oil, which is valuable for the industrial (hydro)cracking processes with increasing tendency of heavy feedstocks. Besides as FCC catalysts, MSY zeolite is also expected to facilitate a wide variety of reactions where mass transport is a limiting factor, such as hydrocracking and biomass conversion.
This work was supported by the National Natural Science Foundation of China, the Key Research Program of Frontier Sciences, CAS and DICP Funding.
Synthesis of mesoporous high-silica zeolite Y and their catalytic cracking performance.Wenhao Cui, Dali Zhu, Juan Tan, Nan Chen, Dong Fan, Juan Wang, Jingfeng Han, Linying Wang*, Peng Tian, Zhongmin Liu,Chinese Journal of Catalysis, 43:1945–1954,2022
