Preparation of Ag–M (M: Fe, Co and Mn)–ZSM‐5 bimetal catalysts with high performance for catalytic oxidation of ethyl acetate

Abstract

The catalytic combustion of ethyl acetate has been investigated in a series of mono-metal silver and bimetal Ag-M (M: Fe, Co and Mn)-modified HZSM-5 zeolites. The objective was to find a catalyst with high superior activity, selectivity towards deep oxidation product and stability. The catalyst activity was measured under excess oxygen condition in a fixed bed reactor operated at gas hourly space velocity (GHSV) = 30000 h(-1), reaction temperature between 150 and 450 degrees C and ethyl acetate inlet concentration of 1000 ppm. Both Fe-Ag-ZSM-5 and Co-Ag-ZSM-5 catalysts exhibited high activity in the oxidation of ethyl acetate. The sequences of catalytic activity and catalytic stability were as follows: Fe-Ag-ZSM-5 > Co-Ag-ZSM-5 > Mn-Ag-ZSM-5 > Ag-ZSM-5 > HZSM-5. Total conversion of ethyl acetate was achieved at above 250 degrees C. The catalysts were characterized by inductively coupled plasma atomic emission spectroscopy, X-ray diffraction, transmission electron microscopy, scanning electron microscopy and X-ray photoelectron spectroscopy.

Removal of ethylene from air stream by adsorption and plasma-catalytic oxidation using silver-based bimetallic catalysts supported on zeolite

“…The coexistence of M and Ag in 13X framework slightly increased the Ag 3d binding energies compared to those of Ag/13X. This is interpreted by the fact that the addition of transition metals resulted in strong mutual effects among M, Ag and 13X, which decreased the surrounding electron cloud density about Ag, therefore increasing the binding energy [35]. As in Table 1 …”

Performance of nanostructure Fe-Ag-ZSM-5 catalysts for the catalytic oxidation of volatile organic compounds: Process optimization using response surface methodology

“…Preliminary experiments to determine the extreme values of the variables have been reported in our previous work [30].…”

“…The starting material was a NH 4 -ZSM-5 solid prepared by ionexchange of Na-zeolite (from Iranian petroleum industry research center with a Si/Al ratio of 14) with NH 4 Cl (1 M) by following the procedures previously reported [30]. The calcination led to the formation of H-form zeolites.…”

“…Catalytic combustion reactions of ethyl acetate were carried out under atmospheric pressure according to the procedure described in the literature [30]. The reactor consisted of a 0.8 cm i.d.…”

“…The process optimization of the oxidation of VOC with the bi-metal catalyst has not been reported in literature. In our previous work [30], we have studied performance of interaction between Ag and Fe, Co, Mn in the complete oxidation of ethyl acetate. Since, Fe-Ag-ZSM-5 appeared to be the most active catalyst; hence the present work intends to assess the effects of variables such as Ag loading, Fe loading, calcinations temperature and reaction temperature to identify the optimum conditions for Fe-Ag-ZSM-5 catalyst in complete oxidation of VOCs, using a central composite design (CCD).…”