title: Activity of double wash-coat monolith catalyst with noble metals and zeolites in selective catalytic reduction of NO(x) with C3H6.
abstract: The selective catalytic reduction (SCR) of NO(x) with C3H6 was studied in the presence of oxygen. The double wash-coat monolith catalysts for SCR comprised a lower layer of Au (or Pt)/Al2O3 and a upper layer of zeolites. The catalytic performance of the double wash-coated catalyst was remarkably improved to broaden the temperature window. The Au and Pt particles were dispersed uniformly on the monolith with particle sizes range of 3 approximately 5 nm and 5 approximately 10 nm, respectively. The catalyst binders used were colloidal silica, potassium silicate and tetraethyl orthosilicate, and the best catalyst activity was achieved with using colloidal silica as a binder. The zeolites used for the catalyst upper layer were MCM-41, FER, Y5.3-Zeolite and ZSM5, among which the NH4-ZSM5-coated catalyst showed the highest activity. The experimental results confirmed the promising potential of the double wash-coat, monolith catalyst for SCR of NO(x) with C3H6 due to the effective combination of noble metal monolith catalyst with zeolite for the removal of NO(x) by SCR with hydrocarbons.
authors.affiliation: Amorepacific Corp. Sulloccha Research Institute, 1241 Sergwangseri, Andeokmyeon, Namjejugun, JeJu-do 699-823, Korea.
authors.forename: Jung-Dae
authors.initials: JD
authors.lastname: Lee
authors.forename: Ki-Joong
authors.initials: KJ
authors.lastname: Kim
authors.forename: Yong-Hwa
authors.initials: YH
authors.lastname: Kim
authors.forename: Gyung-Soo
authors.initials: GS
authors.lastname: Jeon
authors.forename: Young-Key
authors.initials: YK
authors.lastname: Choi
authors.forename: Ho-Geun
authors.initials: HG
authors.lastname: Ahn