Platinum supported on highly-dispersed ceria on activated carbon for the total oxidation of VOCs

Abstract

*Graphical Abstract (for review) Highlights-Pt-CeO 2 catalysts supported on activated carbon are active in the total oxidation of VOCs.-These catalysts have shown higher activity than platinum supported on bulk ceria.-The best catalyst contained only 10wt% ceria.-Pt-10Ce/C catalyst showed a high stability under both dry and humid conditions. AbstractCatalysts consisting in platinum supported on cerium oxide highly dispersed on wt.% ceria loading, likely due to an optimum synergistic interaction between highly dispersed cerium oxide and platinum particles. Pt-10Ce/C achieves total conversion of ethanol and toluene to CO 2 at 433 K and 453 K, respectively, and shows no deactivation during a test for 100 h. Under humid conditions (relative humidity, RH, of 40 and 80 %), the activity was only slightly influenced due to the hydrophobic character of the activated carbon support, which prevents the adsorption of water.

Hydrotalcite-derived Co-containing mixed metal oxide catalysts for methanol incineration

“…The diffraction lines characteristic for MgO (periclase) were found in the powder XRD patterns of the mixed oxides obtained at 600 and 700°C (the lines at approximately 43°, 50°and 74°2h). Phases with spinel structure (represented by diffraction lines at about 22°, 36°, 52°, 70°and 77°2h) were identified, together with periclase-like oxides, in the powder XRD patterns of the samples with the higher Al/Mg ratio (Co 5 Fig. 3 Powder XRD patterns of the mixed oxides obtained at various temperatures from the hydrotalcite-like precursors ratio showed larger surface area and (3) the increase in calcination temperatures resulted in gradual decrease in the surface area of the samples.…”

“…; a part of cobalt cations was oxidised during calcination in air to Co 3? species. Calcination of the samples at high temperature of 800°C, especially in the case of the samples with the higher Al/Mg ratio (Co 5 Mg 62 Al 33 and Co 10 Mg 57 Al 33 ), resulted in the appearance of the well-defined triplet at 545, 590 and 635 nm (inserts in Fig. 4) [34].…”

“…The first transition related to the loss of interlayer water is represented by DTG peaks and maxima of water evolution at temperatures below 250°C. It should be noted that in the case of the samples with higher Al/Mg ratio (Co 5 but the NO evolution was more likely connected with decomposition of residual nitrates, which were not removed from the samples surface after washing.…”

“…The catalysts for VOCs incineration should effectively operate at relatively low temperatures to avoid additional heating of flue gases as well as to limit the formation of NO x by thermal mechanism [3]. Noble metals, such as Pt [4][5][6][7], Pd [8][9][10], Rh [11] and Au [12,13], belong to the most active and effective components of the catalysts for incineration of broad range of various VOCs. On the other hand, high cost of noble metals significantly limits commercial utilisation of such catalysts.…”

Toluene oxidation catalyzed by NiO/SiO2 and NiO/TiO2/SiO2: Towards development of humidity-resistant catalysts

“…However, a higher humidity can have a negative effect, since water molecules adsorbed on the surface of catalyst can block adsorption of other reactant molecules, lowering catalytic conversion efficiency [24,[35][36][37][38][39]. Development of heterogeneous catalysts operating with a constant reactivity under variously humid conditions is highly required.…”