Synthesis and Properties of ZSM-5/MCM-41 Composite Zeolite with a Core-Shell Structure for Cracking of Supercritical n-dodecane

Abstract:

A set of ZSM-5/MCM-41 composite zeolite were synthesized hydrothermally with CTAB as a template and ZSM-5 zeolite as a silica source. XRD patterns of ZSM-5/MCM-41 zeolites contain the characteristic peaks both of ZSM-5 and MCM-41. TEM images show that ZSM-5 zeolite surface was covered with a MCM-41 thin layer varying the thickness with the crystallization time. The BET specific surface area of the composite zeolite increased with increasing the NaOH concentration up to a maximum at 1.5 M, followed by decreased as the NaOH concentration was increased. Catalytic tests were carried out in a tubular reactor coated with the zeolite on its inner wall at 550°C and 4 MPa. The ZSM-5/MCM-41 zeolite with a core-shell structure exhibited a higher conversion of supercritical n-dodecane cracking compared to ZSM-5.

• Periodical: Advanced Materials Research (Volume 528)
• Pages: 267-271
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.528.267
• Online since: June 2012
• Authors: Jin Dan Na, Guo Zhu Liu, Mei Ling Ji, Xue Song Ma, Shen Lin Hu, Li Wang
• Keywords: Alkaline Treatment, Core-Shell Structure, Cracking, Crystallization, ZSM-5/MCM-41 Zeolite

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