Probing the Nature of Surface Barriers on ZSM‐5 by Surface Modification1. Issue 10 (30th August 2017)

• Record Type: Journal Article
• Authors: Ye, Guanghua; Guo, Zhongyuan; Sun, Yuanyuan; Zhu, Kake; Liu, Honglai; Zhou, Xinggui; Coppens, Marc‐Olivier
• Is Part Of: Chemie Ingenieur Technik. Volume 89:Issue 10(2017:Oct.)
• Page Start: 1333
• Page End: 1342
• Publication Date: 2017-08-30
• Subjects: HF etching -- n‐Heptane -- SiO2 deposition -- Surface barriers -- ZSM‐5; Chemical engineering -- Patents -- Periodicals; Chemical engineering -- Periodicals; Chemical industry -- Periodicals; Chemistry, Technical -- Periodicals; 660.05
• DOI: 10.1002/cite.201700081
• Languages: English
• ISSNs: 0009-286X

Abstract

Abstract: The nature of external surface barriers in the zeolite ZSM‐5 was explored by comparing mass transfer of n ‐heptane in samples with different crystal sizes, surface structure, and composition. These different surface properties were achieved by HF acid etching and SiO2 deposition on an as‐synthesized ZSM‐5 crystal sample. HF etching does not reduce surface barriers. SiO2 deposition on the same sample reduces surface barriers significantly. These insights into the nature of surface barriers could be used to guide the rational design of zeolitic materials with better mass transport properties. Abstract : Combining surface modification and zero length column methods, the nature of surface barriers on ZSM‐5 is probed by analysing mass transfer of n ‐heptane in samples with different surface properties. HF etching does not reduce surface barriers, but SiO2 deposition increases the apparent diffusivity by over 140 %, indicating the energetic nature of surface barriers on ZSM‐5.