By employing carbon-packed zeolite nanocrystals as primary building blocks,hierarchically porous MFItype zeolites with precise dimensions spanning meso-and micro-length scales were successfully synthesized using an in...By employing carbon-packed zeolite nanocrystals as primary building blocks,hierarchically porous MFItype zeolites with precise dimensions spanning meso-and micro-length scales were successfully synthesized using an in situ crystallization strategy.The generalized Murray’s law was firstly used to theoretically investigate the advantage of the porous hierarchy of the zeolites.The porosity distribution and coordination in the resultant zeolite crystals were found to be basically following the generalized Murray’s law.Probing using the catalytic cracking reaction of isopropyl benzene revealed that as-prepared HierZSM-5 exhibited much higher conversion(∼74.5%),compared with nanoZSM-5(∼30%)and bulky ZSM-5(∼28.6%).The outstanding catalytic performance was ascribed to the highly enhanced mass transfer of the Murray zeolite material in the heterogeneous catalytic reaction.Such a hierarchical single zeolite structure,designed by adopting the generalized Murray’s law,can improve the thermal/hydrothermal stability of nanozeolites,and offer an alternative option for a long-term stable catalyst.展开更多
基金supported by Program for Changjiang Scholars and Innovative Research Team in University(IRT_15R52)of the Chinese Ministry of Education.B.L.Su acknowledges the Chinese Central Government for an“Expert of the State”position in the Program of the“Thousand Talents”,the Chinese Ministry of Education for a“Changjiang Chaire Professor”position and a Clare Hall Life Membership at the Clare Hall College and the financial support of the Department of Chemistry,University of Cambridge.L.H.Chen acknowledges Hubei Provincial Department of Education for the“Chutian Scholar”programThis work is also financially supported by NSFC-21671155,NSFC-U1663225+2 种基金Major programs of technical innovation in Hubei(2018AAA012)Hubei Provincial Natural Science Foundation(2018CFA054)Shanghai Rising-Star Program(18QB1404500).
文摘By employing carbon-packed zeolite nanocrystals as primary building blocks,hierarchically porous MFItype zeolites with precise dimensions spanning meso-and micro-length scales were successfully synthesized using an in situ crystallization strategy.The generalized Murray’s law was firstly used to theoretically investigate the advantage of the porous hierarchy of the zeolites.The porosity distribution and coordination in the resultant zeolite crystals were found to be basically following the generalized Murray’s law.Probing using the catalytic cracking reaction of isopropyl benzene revealed that as-prepared HierZSM-5 exhibited much higher conversion(∼74.5%),compared with nanoZSM-5(∼30%)and bulky ZSM-5(∼28.6%).The outstanding catalytic performance was ascribed to the highly enhanced mass transfer of the Murray zeolite material in the heterogeneous catalytic reaction.Such a hierarchical single zeolite structure,designed by adopting the generalized Murray’s law,can improve the thermal/hydrothermal stability of nanozeolites,and offer an alternative option for a long-term stable catalyst.
