Total oxidation of naphthalene using palladium nanoparticles supported on BETA, ZSM-5, SAPO-5 and alumina powders

Total oxidation of naphthalene at low temperatures using palladium nanoparticles supported on inorganic oxide-coated cordierite honeycomb monoliths

“…From the N 2 adsorption isotherms (results not shown), it is possible to confirm that, after impregnation with the Pd-based nanoparticles, the shape of the 40 isotherms is the same as for the coated monoliths. Comparing these results with powder catalysts Pd/BETA and Pd/ZSM-5 prepared previously, [22], the decrease in S BET is 45 lower in the coated monoliths. This behavior could be tentatively assigned to the location of deposited Pd nanoparticles.…”

“…were synthesized by the reduction-by-solvent method as reported previously [33]. The catalysts used in this work were prepared by the impregnation method, as reported in our previous work for powdered catalysts [22]. The aforementioned coated monoliths were wrapped with Teflon tape in order to fix them vertically in 5 10 mL Teflon liners and to prevent deposition of Pd nanoparticles on the outer surface of the cordierite monolith.…”

“…Furthermore, a commercial γ-Al 2 O 3 has been coated on the monolithic supports by the dip-coating method for 70 comparative purposes. The active phase that will be employed is polymer protected Pd nanoparticles, which have shown good properties as catalysts for naphthalene total oxidation with the supports above, when they were used as powder catalysts [22]. Special attention has focused on the stability and recyclability of 75 (400 cpsi, length (l): 14 cm, diameter (d): 14 cm).…”

“…For catalytic total oxidation, the types of catalysts used are based to a large extent on metals such as Pd, Pt, Ru or Co supported on 30 γ-alumina by impregnation [14], metal oxide catalysts [2,[15][16][17][18][19], mesoporous aluminosilicates with supported Pt [20] or the use of zeolites ion-exchanged with Pt [21]. Based on our previous studies [22], the use of polymer protected Pd nanoparticles supported on zeolites is one of the most promising types of 35 catalyst for the total oxidation of naphthalene, due to the low oxidation temperature reported (165-180ºC), and the high stability of the catalyst. However, for practical applications macro-structured catalysts are preferred over powdered catalysts.…”

Effect of Mn substitution on the promoted formaldehyde oxidation over spinel ferrite: Catalyst characterization, performance and reaction mechanism

“…Moreover, at 300 • C the addition of water did not cause apparent decrease in HCHO conversion. This may suggest that the Mn substituted spinel ferrite is catalytically durable in the studied temperature, and not sensitive to the presence of moisture at high temperature, e.g., 300 • C, unlike previously reported noble metal catalysts [15,16].…”