Activity of double wash-coat monolith catalyst with noble metals and zeolites in selective catalytic reduction of NO(x) with C3H6.
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.
Lee
Jung-Dae
JD
Amorepacific Corp. Sulloccha Research Institute, 1241 Sergwangseri, Andeokmyeon, Namjejugun, JeJu-do 699-823, Korea.
Kim
Ki-Joong
KJ
Kim
Yong-Hwa
YH
Jeon
Gyung-Soo
GS
Choi
Young-Key
YK
Ahn
Ho-Geun
HG