On the role of Pd β-hydride in the reduction of nitrate over Pd based catalyst

Mono and bimetallic NaY catalysts with high performance in nitrate reduction in water

“…The monometallic catalysts show peaks with maxima around 230°C for Pd and 260°C for Cu. The reduction peak at 60°C attributed to the decomposition of Pd b-hydride was not observed, indicating that Pd was well dispersed in the zeolite [25,26]. Both bimetallic catalysts show a single reduction peak at higher temperatures than the monometallic catalysts (at 275°C for CuPd-Y and 300°C for PdCu-Y).…”

Reduction of highly concentrated nitrate using nanoscale zero-valent iron: Effects of aggregation and catalyst on reactivity

“…Nitrates can be changed to nitrites that thereby hinder oxygen from combining with hemoglobin, potentially causing serious diseases [32] or they can also be a source of eutrophication when exposed to an ecosystem [33]. Recently, the chemical reduction of nitrates using catalysts has been gaining increased interest due to the disadvantages of conventional nitrate removal technologies, such as biological denitrification and ion exchange [34][35][36]. It should be noted that previous works have outlined some promising applications of NZVI for nitrate reduction; however, these studies have typically focused on groundwater remediation in which the nitrate concentrations tested were mostly limited to levels less than 100 ppm, though cases in which the concentration was several hundred ppm have also been tested [6,9,[37][38][39].…”

Highly efficient reduction of bromate to bromide over mono and bimetallic ZSM5 catalysts

“…29,30 The bimetallic PdCu-ZSM5 catalyst ( profile not shown) presented a single reduction peak around 150°C that can be assigned to the reduction of Cu oxides, promoted by the presence of the noble metal. In the case of Pd-ZSM5, the reduction peak observed at 60°C is attributed to the decomposition of Pd β-hydride.…”

“…In the case of Pd-ZSM5, the reduction peak observed at 60°C is attributed to the decomposition of Pd β-hydride. 30 Catalytic tests Fig. 31,32 The decrease in the reduction temperature of the supported copper in bimetallic catalysts induced by the presence of palladium indicates that a close proximity between copper and palladium species was achieved.…”