The Influence of Deposition Methods of Support Layer on Cordierite Substrate on the Characteristics of a MnO₂-NiO-Co₃O₄/Ce0.2Zr0.8O₂/Cordierite Three Way Catalyst

Phuong Thi Mai Pham; Minh Thang Le; Tien The Nguyen; Els Bruneel; Isabel Van Driessche

doi:10.3390/ma7096237

The Influence of Deposition Methods of Support Layer on Cordierite Substrate on the Characteristics of a MnO₂-NiO-Co₃O₄/Ce_0.2Zr_0.8O₂/Cordierite Three Way Catalyst

Materials (Basel). 2014 Sep 2;7(9):6237-6253. doi: 10.3390/ma7096237.

Authors

Phuong Thi Mai Pham¹, Minh Thang Le², Tien The Nguyen³, Els Bruneel⁴, Isabel Van Driessche⁴

Affiliations

¹ Laboratory of Environmental Friendly Materials and Technology, Advanced Institute of Science and Technology, Hanoi University of Science and Technology, 1 Dai Co Viet, Hanoi 10000, Vietnam. maiphuong1985@gmail.com.
² Department of Organic and Petrochemical Technology, School of Chemical Engineering, Hanoi University of Science and Technology, 1 Dai Co Viet, Hanoi 10000, Vietnam. thang.leminh@hust.edu.vn.
³ Laboratory of Environmental Friendly Materials and Technology, Advanced Institute of Science and Technology, Hanoi University of Science and Technology, 1 Dai Co Viet, Hanoi 10000, Vietnam. thetienhdbk@gmail.com.
⁴ Department of Inorganic and Physical Chemistry, SCRiPTS, Ghent University, Krijgslaan 281-S3, Gent 9000, Belgium. els.bruneel@ugent.be.

Abstract

This paper compares different coating methods (in situ solid combustion, hybrid deposition, secondary growth on seed, suspension, double deposition of wet impregnation and suspension) to deposit Ce_0.2Zr_0.8O₂ mixed oxides on cordierite substrates, for use as a three way catalyst. Among them, the double deposition was proven to be the most efficient one. The coated sample shows a BET (Brunauer-Emmett-Teller) surface area of 25 m²/g, combined with a dense and crack free surface. The catalyst with a layer of MnO₂-NiO-Co₃O₄ mixed oxides on top of the Ce_0.2Zr_0.8O₂/cordierite substrate prepared by this method exhibits good activity for the treatment of CO, NO and C₃H₆ in exhaust gases (CO conversion of 100% at 250 °C, C₃H₆ conversion of 100% at 400 °C and NO conversion of 40% at 400 °C).

Keywords: CO; NO; ceria—zirconia; cobalt oxide catalysts; cordierite; manganese; nickel; oxidation; propylene.