Impacts of catalyst coating on the filtration performance of catalyzed wall-flow filters: From the viewpoint of microstructure

Qiang Lyu, Qisheng Ou, Weiqi Chen, Yujun Wang, Cheng Chang, Yuejin Li, Defu Che, David Y.H. Pui

Research output: Contribution to journalArticlepeer-review

Abstract

Initial filtration efficiency and soot loading characteristics are important performance criteria for catalyzed wall-flow filters. In this context, the influence of catalyst coating on filtration performance was investigated over a set of bare and coated silicon carbide (SiC) filter cores. Catalyst coating demonstrates a significant decrease effect on the initial filtration efficiency. Both filtration efficiency and pressure drop increase faster with time on coated filters in the deep-bed filtration regime. The scanning electron microscopy (SEM) results reveal that catalyst is preferentially deposited in the smaller pores. The mercury intrusion porosimetry (MIP) data show that catalyst coating reduces the pore volume for the pores relevant to filtration. The capillary flow porometry (CFP) results confirm that the coated catalyst wipes out a group of smaller pores. Accordingly, for the first time, we provide a working mechanism to explain the decreased filtration efficiency on catalyzed filters based on the experimental results and characterization data.

Original languageEnglish (US)
Article number120417
JournalSeparation and Purification Technology
Volume285
DOIs
StatePublished - Mar 15 2022

Bibliographical note

Funding Information:
The authors thank the support of members of the Center for Filtration Research: 3 M Corporation, Applied Materials, Inc. BASF Corporation, Boeing Company, Corning Co. China Yancheng Environmental Protection Science and Technology City, Cummins Filtration Inc. Donaldson Company, Inc. Entegris, Inc. Ford Motor Company, Guangxi WatYuan Filtration System Co. Ltd, LG Electronics Inc. Parker Hannifin, Samsung Electronics Co. Ltd. Xinxiang Shengda Filtration Technology Co. Ltd. TSI Inc. W. L. Gore & Associates, Inc. Shigematsu Works Co. Ltd. and the affiliate member National Institute for Occupational Safety and Health (NIOSH). The authors also acknowledge the support from the program of China Scholarship Council (CSC201806280073).

Funding Information:
The authors thank the support of members of the Center for Filtration Research: 3 M Corporation, Applied Materials, Inc., BASF Corporation, Boeing Company, Corning Co., China Yancheng Environmental Protection Science and Technology City, Cummins Filtration Inc., Donaldson Company, Inc., Entegris, Inc., Ford Motor Company, Guangxi WatYuan Filtration System Co., Ltd, LG Electronics Inc., Parker Hannifin, Samsung Electronics Co., Ltd., Xinxiang Shengda Filtration Technology Co., Ltd., TSI Inc., W. L. Gore & Associates, Inc., Shigematsu Works Co., Ltd., and the affiliate member National Institute for Occupational Safety and Health (NIOSH). The authors also acknowledge the support from the program of China Scholarship Council (CSC201806280073).

Publisher Copyright:
© 2022 Elsevier B.V.

Keywords

  • Catalyst coating
  • Catalyzed soot filter
  • Engine exhaust
  • Filtration performance
  • Pore size distribution

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