Interplay between nanoscale reactivity and bulk performance of H-ZSM-5 catalysts during the methanol-to-hydrocarbons reaction

Journal article (2013)

Authors

LR Aramburo External organisation
S Teketel External organisation
S Svelle External organisation
SR Bare External organisation
B Arstad External organisation
H.W. Zandbergen QN/High Resolution Electron Microscopy
U Olsbye External organisation
FMF de Groot External organisation
BM Weckhuysen External organisation
Research Group
QN/High Resolution Electron Microscopy
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Published Date

2013

Language

Undefined/Unknown

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Research Group

QN/High Resolution Electron Microscopy

Abstract

H-ZSM-5 catalyst powders before and after a steaming post-treatment have been investigated during the Methanol-To-Hydrocarbons (MTH) process at 350 degrees C. Bulk and surface characterization techniques have been combined with in situ Scanning Transmission X-ray Microscopy (STXM) at the aluminum and carbon K-edge to study the changes in acidity, porosity, reactivity, and aluminum distribution upon steaming. It was found that steaming post-treatment has a positive impact on the stability of H-ZSM-5 without inducing important changes in the MTH activity and selectivity. The lower MTH stability of non-steamed H-ZSM-5 catalyst powder is related to the formation of poly-aromatic compounds in the outer regions of the catalyst particles, as probed with in situ STXM. In contrast, a limited amount of poly-aromatics was found in the outer rim of steamed H-ZSM-5 catalyst particles. These differences occur as a result of the generation of mesoporosity as well as the reduction in the number and strength of acid sites after steaming, as evidenced by the nanoscale imaging of adsorbed pyridine with STXM