Catalytic features of Pt,Co-mordenite for the SCR of NOx monitored by DRIFT spectroscopy using adsorbed N2 as a probe

The simultaneous selective catalytic reduction of N 2 O and NO X with CH 4 on Co- and Ni-exchanged mordenite

“…As already suggested for Co-MOR at various Co-exchange extent from 11 to 104% [24,28] and for Ni-zeolites [23,29], the thermal treatment subsequent to the exchange process induced the hydrolysis of the anchored tmi 2+ (H 2 O) n complexes, yielding Brønsted acid hydroxyls and [tmi(OH)] + . On low-extent exchanged tmi-MOR, tmi 2+ (H 2 O) n were stabilized by the presence of two Al atoms within a specified distance of each other (Al-Al pair).…”

Logical Design for Replacement of Rh with Co in a Synergistic Catalyst for the Reduction of NO with H2

“…However, the active phase present on the zeolite-supported Pt-Co catalysts for the SCR of NO with CH 4 , consists of Co 2? ions, Pt 0 and Co 0 in close proximity, and/or Pt-Co nanoparticles, which adsorb and oxidize NO to NO 2 which is then reduced to N 2 by oxidizing CH 4 [12][13][14][15][16]. The active phase sought in the present study differs in that it consists of alloy nanoparticles with favorable ratios and distributions of Pt and Co on the nanoparticle surfaces to enhance NO dissociation.…”

“…The Pt-Co catalyst examined in this study was designed through the application of principles developed through the synthesis and characterization of a synergistic Pt(95%)-Rh(5%)/c-Al 2 O 3 (95/5) catalyst for the reduction of NO with H 2 [1,2,4,[6][7][8] and relevant literature describing the characteristics of Co/c-Al 2 O 3 catalysts and bimetallic PtCo catalysts [12][13][14][15][16][17][18][19]. The synergistic performance 95/5 for the reduction of NO with H 2 is attributed to the presence of a Pt-Rich single-phase Pt-Rh alloy nanoparticle population with an appropriate amount of surface-segregated Rh [4].…”

“…The Pt-Co/c-Al 2 O 3 catalysts in the present study are different from the zeolite-supported Pt-Co catalysts used for the selective catalytic reduction (SCR) of NO with CH 4 in excess oxygen [12][13][14][15][16]. In the case of SCR of NO with CH 4 , Pt is added to enhance the performance of a catalyst where Co is the primary active component, whereas in this study Co is added to enhance the performance of a catalyst in which Pt is the primary active component.…”

Enhanced Low-Temperature Activity of Ag-Promoted Co-ZSM-5 for the CH4-SCR of NO

“…Co 0? ) [21,22] and the one at 580°C is indicative of CoO x species in the channels or surface of zeolites (profile (b)) [22,23].…”