ADSORPTION OF 4,6-DIMETHYLDIBENZOTHIOPHENE OVER Cu/ZrO2

Abstract

The adsorption of refractory sulfur molecule 4,6-Dimethyldibenzothiophene (4,6-DMDBT) over copper supported on zirconia, using different copper loadings (2-10% w/w) and a zirconia support with a high specific surface area, was studied. The results showed that the adsorption capacity of 4,6-DMDBT over Cu/ZrO 2 increased with copper content, reaching a maximum at around 8% Cu (0.58 mmol 4,6-DMDBT per gram of adsorbent). The results of characterizations with H 2 -TPR, Electrophoretic Migration, and XRD demonstrated that this Cu loading (8%) also corresponds to a maximum copper dispersion capacity for ZrO 2 support. Also, these absorbents showed considerable selectivity toward the adsorption of 4,6-DMDBT in a feed stream also containing Quinoline, decreasing adsorption capacity of 4,6-DMDBT by only 35%, despite both molecules being present in the same concentrations. The results of this work showed that desulfurization adsorption using Cu/ZrO 2 adsorbents can be an effective method to remove this type of refractory sulfur molecules, and an excellent alternative as a complementary process for deep desulfurization in the fuel industry.

Total Oxidation of Naphthalene with Zirconia-Supported Cobalt, Copper and Nickel Catalysts

“…It is interesting to observe that the CuO reductions in the CuZ 2 h and CuZ 5 h catalysts occur at about 160 • C below the temperature observed for the pure CuO (around of 360 • C) [58,59], revealing a high dispersion of copper species, in agreement with CuO phase absence in the XRD pattern and Raman spectroscopy results.…”

“…Moreover, signals for CoO or CuO supported oxides appear in a temperature range slightly shifted with respect to that observed for pure oxides (Supplementary Materials) [19,[57][58][59][60]. So, the pure Co 3 O 4 TPR profile is characterized by two reduction steps, assigned to Co(III)-Co(II) and Co(II)-Co • (with maximums at 324 and 397 • C respectively) [19], while the TPR profiles of CoZ 2 h and CoZ 5 h catalysts show a series of signals in the range 260-360 • C, which indicate the presence of diverse types of cobalt oxide species, or species with different interactions over the support.…”

Reactive Adsorption Desulfurization on Cu/ZnO Adsorbent: Effect of ZnO Polarity Ratio on Selective Hydrogenation

“…The broad reduction profiles with shoulders were found at the temperature around of 200–350 °C. The peaks α and β can be attributed to a stepwise reduction of copper species from Cu 2+ to Cu + , closely followed by the reduction from Cu + to Cu 0 . − The Gaussian fitting was used for further investigating the properties of samples and the results of peak position and relative concentration are shown in Table . Moreover, CuO/ZnO with the different polarity ratios of ZnO supports show the different fitting peaks areas in the reduction process, which copper loaded on the high polarity ratio of ZnO supports might be difficult reduced at the same temperature …”

Ultra-deep desulfurization by reactive adsorption desulfurization on copper-based catalysts

“…Compared with the fresh catalyst, the surface area and the pore diameters decreased. to Cu + , closely followed by the reduction from Cu + to Cu 0 [38][39][40][41] . With increased of Cu loadings, the ratio of peak γ appeared and increased, which can be ascribed to the reduction of the bulk CuO.…”