Article ID Journal Published Year Pages File Type
153557 Chemical Engineering Journal 2009 7 Pages PDF
Abstract

Micronic ZSM5 (Si/Al = 25) powder has been deposited on cordierite monoliths by dip-coating technique using colloidal alumina or silica as binders with different zeolite/binder ratios in aqueous suspension determining the parameters to obtain the best adhesion and mechanical resistance of the washcoat layer. For monolithic catalysts with washcoat containing 10 wt% SiO2 the following alternative preparation procedures have been used: (i) deposition of a pre-exchanged Cu-ZSM5 powder on the ceramic monolith; (ii) deposition of a H-ZSM5 powder on the ceramic monolith followed by copper exchange of the structured catalyst.The monolithic catalysts have been investigated by morphological (SEM), physical (BET and porosity), chemical (ICP-MS, EDX, XRD, H2 TPR) and catalytic (NO decomposition tests in flow reactor under dry and wet conditions) analyses. Results have been compared with those obtained on the corresponding Cu-ZSM5 powder sample with the same copper content and Si/Al ratio in order to define the effect of the preparation procedure on the chemical and catalytic properties of the monoliths.

Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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