02242nas a2200217   4500008004100000022001400041245011600055210006900171260000800240300001400248490000700262520148500269100001801754700002001772700002201792700001901814700002201833700001801855700002301873856012801896       2023                        eng d  a2044-475300aOxidation of ethylene by Cu/TiO2: reducibility of Cu2+ in TiO2 as a possible descriptor of catalytic efficiency0 aOxidation of ethylene by CuTiO2 reducibility of Cu2 in TiO2 as a  cAPR  a2330-23390 v133 a<p>
	Catalytic oxidation using non-noble metal-based catalysts is a promising approach to mitigate pollution due to VOCs in the air. In this work, mesoporous Cu/TiO2 catalysts containing different concentrations of Cu2+ (0.2, 1, 3, and 4 wt% Cu w.r.t. Ti) were synthesized using the sol-gel technique. The catalysts were characterized using inductively coupled plasma-optical emission spectrometry, XRD, Raman spectroscopy, N-2 physisorption, cyclic voltammetry, H-2-TPR and electron microscopy to understand the structure and composition. The thermal catalytic gas phase oxidation of ethylene was studied by heating a mixture of ethylene (1.5 vol%) and air (5.9 vol%) in the presence of the Cu/TiO2 samples in the temperature range of 298 to 773 K. Cu/TiO2 showed a higher catalytic activity compared to TiO2 for the thermal oxidation of ethylene, indicating a strong promotion by doped copper ions. A volcanic behaviour in the catalytic activity was observed with different concentrations of Cu doping, with 1% Cu/TiO2 showing a 99.5% ethylene conversion at 673 K and 100% selectivity to CO2. The activity of 1% Cu/TiO2 remained consistent without deactivation for 24 h. At low dopant concentrations of Cu (0.2 and 1% Cu/TiO2), the reduction of Cu2+ to Cu+ was observed. An interplay of oxygen vacancies (O-V), Cu+, Cu2+ and Ti4+ may be involved in controlling the activity. DRIFT studies indicated the formation of surface bidendate carbonate as a possible intermediate.</p>
1 aRajendran, K.1 aSharma, Mandeep1 aJaison, Augustine1 aAnkitha, Menon1 aTiwari, Ankit, D.1 aVinod, C., P.1 aJagadeesan, Dinesh  uhttps://library.ncl.res.in/content/oxidation-ethylene-cutio2-reducibility-cu2-tio2-possible-descriptor-catalytic-efficiency