Roles of nano-sized Au in the reduction of NOx by propene over Au/TiO2: An in situ DRIFTS study

Focus on the modified CexZr1−xO2 with the rigid benzene-muti-carboxylate ligands and its catalysis in oxidation of NO

“…8 showed the spectra after the introduction of 4000 ppm NO at 250 • C and followed 8% O 2 was introduced. The surface of tested catalysts was covered by two kinds of nitrates: monodentate nitrate (1261 cm −1 ) and bidentate nitrate (1550 cm −1 ) [55][56][57]. In addition, the weak bands at 1845 and 1762 cm −1 were also presented, which could be assigned to the weak NO adsorption in the form of NO + [10,58].…”

Synthesis of Gold Catalysts Supported on Mesoporous Silica Materials: Recent Developments

“…After the pioneering works of Hutchings [1] and Haruta et al [2], the high activity of gold catalysts has demonstrated that gold can be the catalyst of choice for an important number of chemical reactions such as selective oxidations and hydrogenations of organic substrates [2][3][4][5][6], water-gas shift reaction [7][8][9], acetylene hydrochlorination [10,11], direct synthesis of hydrogen peroxide [12], reduction of NO to N 2 [13,14] and the addition of nucleophiles to acetylenes [15], among others [16,17]. Although gold has been sometimes alloyed with other metals such as Pd, Cu and Ag, in most cases, gold alone exhibits high and exceptional catalytic activity.…”

Lean-burn NOx Reduction by Propene over Gold Supported on Alumina Catalysts Derived from the Sol–Gel Method

“…A larger activity window was observed with a slight improvement in the activity. The oxidation of propene corresponded to the reduction of NO x for both oxygen concentrations, suggesting that the hydrocarbon was activated via a partial oxidation to form several oxygenated forms (C x H y O z ), such as formate and acetate, before subsequently participating in the reduction of NO x [30,31]. The results from this present work also showed that propene was more easily converted, and its complete conversion shifted to lower temperatures in a stream containing a larger amount of oxygen.…”