Effect of the Addition of In to Co/HMCM-49 Catalyst for the Selective Catalytic Reduction of NO Under Lean-burn Conditions

Abstract

Selective catalytic reduction (SCR) of NO with propane using bimetals (3Co2Ce, 3Co2Sr, 3Co2Sn and 3Co2In) loaded on HMCM-49 zeolite was studied under lean-burn condition. Only 3Co2In.HMCM-49 exhibited higher deNO x activity in a wide temperature range. The catalysts were characterized by N 2 -adsoption, X-ray diffraction (XRD), temperature-programmed surface reactions (TPSR) and temperature-programmed desorption (TPD) of NO. TPSR and TPD results exhibited that the addition of In inhibited the oxidation ability of Co on 3Co2In. HMCM-49 catalyst, but enhanced NO x adsorption.

Promotion of Nonthermal Plasma on the SO2 and H2O Tolerance of Co–In/Zeolites for the Catalytic Reduction of NO x by C3H8 at Low Temperature

“…The long-term thermal stability [4], loaded states of Co [5], effects of Co loading and precursor [6], preparation method [7], and reaction mechanism [8] have been widely investigated for HC-SCR on Co/Beta, especially for C 3 H 8 -SCR [3][4][5][6][7]. To improve the stability and activity of Co/zeolites in HC-SCR, many studies have focused on the modification of Co/zeolites by adding indium, such as Co-In/Beta [9], Co-In/ZSM-5 [10], CoIn/HMCM-49 [11], and Co-In/ferrierite [12]. Interestingly, Zhang et al [13] found that Co loaded on a composite of zeolites (Beta/Y) showed higher activity than Co/Beta in CH 4 -SCR because of the stronger adsorption of NO and NO 2 on Co-exchanged Beta/Y catalyst.…”