Details

Autor(en) / Beteiligte

• Yang, Xiaona
• Ma, Xiaosen
• Wang, Xuchang
• Qin, Bo
• Zhang, Licheng
• Du, Yanze
• Liu, Yanchao
• Wang, Quanhua
• Wang, Yan
• Zheng, Jiajun

Titel

Caterpillar-shaped hierarchical ZSM-5 resulted from the self-assembly of regularly primary nano-sized zeolite crystals

Ist Teil von

• Journal of porous materials, 2023-10, Vol.30 (5), p.1543-1553

Ort / Verlag

New York: Springer US

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Hierarchical ZSM-5 with a caterpillar-shaped morphology is hydrothermally synthesized, and characterized by XRD, SEM, TEM, N 2 adsorption-desorption, and NH 3 -TPD. The synthesis parameters influence on the formation of the caterpillar-shaped hierarchical ZSM-5 are investigated and discussed in details. The results suggest that nano-sized ZSM-5 zeolite crystals is yielded from an appropriate precursor and then forms the caterpillar-shaped hierarchical ZSM-5 by in-situ self-assembly of the primary nanocrystals. SEM and TEM images display that the primary crystals in the caterpillar-shaped zeolite samples formed by self-assembly along b -axis of MFI zeolite have a size of about 100 nm. Catalytic cracking of triisopropylbenzene (TIPB) is selected as a probe reaction so as to investigate the catalytic performances of the as-synthesized caterpillar-shaped hierarchical ZSM-5 zeolite. The results show that the as-synthesized hierarchical ZSM-5 zeolite with the increased external surfaces exhibits an elevated catalytic activity during the catalytic cracking of TIPB, and the corresponding traditional ZSM-5 zeolite displays very little activity because of the small external surfaces. The results also show that for the hierarchical ZSM-5-40-5.32-2.1, due to the high external surfaces and the interpenetrated hierarchical pore system, a multi-stage cracking process for the reaction TIPB molecule is detected. That may offer a potential highly effective catalyst for the catalytic cracking of bulky reactant molecule.