Influence of calcination temperature on Ce/TiO2 catalysis of selective catalytic oxidation of NH3 to N2

Synthesis of core-shell structured CdS@CeO 2 and CdS@TiO 2 composites and comparison of their photocatalytic activities for the selective oxidation of benzyl alcohol to benzaldehyde

“…By this way, the ratios of Ce 3+ to Ce 4+ in CdS@CeO 2 -90 and CdS@CeO 2 -180 were estimated to be 0.4/1 and 0.59/1, respectively. Herein, the increase of Ce 3+ content in CdS@CeO 2 -180 probably results from the hydrothermal treatment [45]. In Fig.…”

“…By comparing the peak areas of O 1s in CdS@CeO 2 -90 and CdS@CeO 2 -180, it can be found that the content of oxygen corresponding to the chemisorbed oxygen species in CdS@CeO 2 -180 is obviously higher than that in CdS@CeO 2 -90. This is because oxygen vacancies and unsaturated chemical bond induced by Ce 3+ species lead to the increase of chemisorbed oxygen on the surface [45,47].…”

“…CdS@CeO 2 -180 has a higher Ce 3+ content than CdS@CeO 2 -90. It has been reported that the sample with higher Ce 3+ content has stronger capability of adsorbing oxygen and separating electrons and holes [55][56][57].…”

Selective catalytic oxidation of ammonia to nitrogen over MnO2 prepared by urea-assisted hydrothermal method

“…Moreover the exorbitant price of noble metals also limited their widespread application. Relatively cheap transition-metal-oxide catalysts, including CeO 2 [6,7] and Co 3 O 4 [8], also showed appropriate activities for NH 3 -SCO, but the operation temperature remained unsatisfactory (300-450 • C). Therefore, it is essential to develop the efficient transition-metaloxide catalysts for the removal of NH 3 at low temperatures.…”

Catalytic performance of manganese doped CuO–CeO 2 catalysts for selective oxidation of CO in hydrogen-rich gas

“…They found that without the pretreated, the three CeO 2 catalysts with Cu-doped, Cu/CO, Cu/Ni-codoped showed a higher CO performance, and upon N 2 (or H 2 -thermal treatment) the T 10% of Cu-doped catalyst was lowered by 80°C, which was attributed to balanced charge pairs of Cu 2+ /Cu + and Ce 4+ /Ce 3+ for CO oxidation reactions. Lee et al [14] have studied the influence of calcination temperature on the catalytic performance of Ce/TiO 2 catalysts for selective catalytic oxidation of NH 3 to N 2 and the results showed that the catalytic activity was mainly dependent on the oxidation states of the Ce species and behavior of oxygen within the catalyst, and the Ce/TiO 2 catalyst calcined at 400°C showed the highest NH 3 conversion ($96%) and N 2 ($93%) yield (at 350°C). Liu et al [15] have reported the impact of calcination temperature on the structure and catalytic performance of CuO x -CoO y -CeO 2 ternary mixed oxide for CO oxidation, and they found that CuO x -CoO y -CeO 2 went through continuous structural transformations as the calcination temperature changes, which included three stages, such as the hydroxide dehydration below 400°C, enhanced interaction between Co 3 O 4 and CeO 2 at ca.…”