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Modification of Cordierite Honeycomb Ceramics Matrix for DeNOx Catalyst

Published online by Cambridge University Press:  21 May 2012

Qingcai Liu ,
Yuanyuan He ,
Jian Yang ,
Wenchang Xi ,
Juan Wen  and
Huimin Zheng
Qingcai Liu
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing, 400030, China
Yuanyuan He
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing, 400030, China
Jian Yang
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing, 400030, China
Wenchang Xi
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing, 400030, China
Juan Wen
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing, 400030, China
Huimin Zheng
Affiliation:
College of Materials Science and Engineering, Chongqing University, Chongqing, 400030, China
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Abstract

To obtain highly dispersed and highly active catalysts by impregnating of active species onto the monolith directly, cordierite honeycomb ceramics were modified by nitric acid solution of 68wt%. Effects of acid treatment temperature and time on the performance of cordierite were investigated. Specific surface area, pore size distribution, morphology and structure of cordierite were characterized by N2-physical adsorption, SEM, XRD, respectively. Concentrations of ions in the acid solution were measured by AAS. It is shown that the corrosion content of cordierite increases and more micropores are generated with increasing time of acid treatment, leading to an upward trend of specific surface area. The coefficient of thermal expansion and compression strength decrease obviously at a higher temperature, which is mainly attributed to the removal of Al and Mg ions from the silicate structure and delayed formation of free amorphous silica on the surface of the cordierite. The optimal modification process of cordierite matrix acid erosion is at 110°C for 6 h.

Keywords

corrosionceramicmicrostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1449: Symposium BB – Solution Synthesis of Inorganic Films and Nanostructured Materials , 2012 , mrss12-1449-bb06-38
Copyright
Copyright © Materials Research Society 2012

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References

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