Comparison of catalytic activity and selectivity of Pd/(OSC+Al2O3) and (Pd+OSC)/Al2O3 catalysts

Effect of Surface Copper Species on NO + CO Reaction over xCuO-Ce0.9Zr0.1O2 Catalysts: In Situ DRIFTS Studies

“…For the currently-reported technologies of NO x abatement, the reduction of NO by CO occurring over three-way catalysts (TWCs) has attracted tremendous attention due to the simultaneous conversion of CO and NO. Noble metal catalysts (Rh, Pt and Pd) have been used in the reaction of NO + CO [2][3][4][5][6][7][8][9], due to their high activity and selectivity for NO reduction. Because of the scarcity and high price of Rh, Pt has been considered to be a better catalytic candidate for the catalytic reduction of NO.…”

A new insight into the effects of barium addition on Pd-only catalysts: Pd-support interface and CO+NO reaction pathway

“…Also, the palladium-ceria interaction at the palladium-ceria interface has been found to offer more active sites for oxygen activation, which would maintain the oxidative state and the adsorption properties of palladium to keep a high catalytic activity [17]. Additionally, the palladium-ceria interaction is beneficial to improve the resistance to thermal ageing of the Pd-only catalysts, which has been reported in our previous study [18].…”

Challenges in Catalysis for Sustainability

“…Alvaraz et al have stated that the primary NO 2 emissions of modern diesel cars are increasing [76]. on different washcoats (Al 2 O 3 , La 2 O 3 , zeolites), and additive materials (oxygen storage materials, barium oxides) have been under intensive studies for many years [77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95]. The catalyst materials are observed to behave differently depending on the reaction conditions, which can be rich, stoichiometric, or lean [79].…”

“…The activity tests with different reactant gas mixtures (NO, HCs, CO, and oxygen) together with surface analysis methods such as in situ DRIFT [84][85][86][87][88] give important information to understand the oxidation and reduction reactions occurring on the catalyst's surface. Since the lifetime of a modern catalytic converter is high (over 100 000 km), the development of laboratory-scale accelerated aging methods is vital for finding out the reasons for the catalytic decline by thermal degradation [80,81,89] as well as by chemical poisoning via phosphorus [89][90][91][92][93][94], calcium [90], and sulfur [95][96][97]. These poisons cause many changes in the properties of a catalyst.…”