CO interaction with zeolites studied by TPD and FTIR: transition-metal ion-exchanged FAU-type zeolites

CO oxidation over Au supported on Mn–ZSM5 and Mn–MOR

“…5), which is attributed to CO 2 adsorbed linearly to cations. Since in our samples the main species are exchanged Mn +2 and deposited Au 0 , CO 2 is most probably associated with a CO disproportionation during adsorption at exchange sites (acid Lewis sites) [17] and suggests a possible carbonate formation on the surface during reaction [12].…”

“…5) show a complex band due to the stretching of CO adsorbed on the different metals (Au, Mn, Na). Additionally, CO can be adsorbed in unsaturated Al 3+ sites of the zeolite [17]. For all the samples studied, despite the pretreatment, the position of the bands does not change with respect to that of the evacuated samples.…”

Effect of MnOx in the catalytic stabilization of Co2MnO4 spinel during the ethanol steam reforming reaction

“…On the other hand, the majority of adsorbed CO generally desorbs as CO 2 , but there is also the molecular desorption of CO at temperatures as low as 50-100 • C, and CO desorption begins immediately upon initiation of the temperature ramp [36]. CO-adsorption on metallic species is often observed at higher temperature than those on oxidized species [37]. In Fig.…”

The Effect of Co2+-Ion Exchange Time into Zeolite Y (FAU, Si/Al = 1.56): Their Single-Crystal Structures

“…-exchanged zeolite Y is well established efficient heterogeneous catalysts in industrial processes 1 and they have been extensively studied for the following applications: the epoxidation of styrene 2 and -pinene, 3 the disproportionation of CO, 4 the hydrodesulfurization reaction, 5 the reduction of NO, 6 the oxidation of benzyl alcohol 7,8 and methylene chloride and carbon tetrachloride, 9 the oxidative dehydrogenation of ethanol 10 and cyclohexene, 11 the ammoxidation of ethane, 12 the decomposition of N 2 O, 13 and the dehydration of ethanol. 14 To develop better Co 2+ catalysts, the positions, occupancies, and environments of Co 2+ ions in zeolites are of great interest in understanding their catalytic properties.…”