Formation of subsurface oxygen species and its high activity toward CO oxidation over silver catalysts

Comparative studies of silver based catalysts supported on different supports for the oxidation of formaldehyde

“…Various oxygen species have been observed on silver catalyst, for instance, the molecular, subsurface, and various forms of surface atomic oxygen by a variety of spectroscopic techniques, such as DFT, XPS, HRTEM, and O 2 -TPD and so on [21,22,41]. O 2 -TPD experiments have been used to study the interaction of the silver particles with oxygen and distinguish various oxygen species in our previous work [23]. Two oxygen desorption peaks appear in the TPD spectrum for the Ag/SiO 2 catalyst pretreated with oxygen at 500 • C. It is thought that the peak at the lower temperature is assigned to the bulk-oxygen species (O ␤ ) and the desorption peak at higher temperatures (>600 • C) is attributed to subsurface oxygen (O ␥ ) [42][43][44].…”

“…sidered as the catalyst for HCHO oxidation although it has been recognized to show a high activity in several partial oxidation reactions, such as hydrogenation of unsaturated aldehydes [20], partial oxidation of methanol to formaldehyde [21], and oxidative coupling of methane to ethane and ethylene [22], CO oxidation [23,24] and so on. Only relatively low activity for HCHO oxidation was observed on silver supported on MnO x -CeO 2 and SiO 2 [4,17,18], moreover no investigations about the interaction of reactants with the surface of active sites and the surface reaction process were reported.…”

Study of oxidative coupling of methane integrated with CO oxidation

“…ese catalysts have been recognized to show a relatively high activity in the oxidation of CO and a low activity in the oxidation of CH 4 [42,43]. In this work, we have investigated the integration of the OCM process over Mn-Na 2 WO 4 /SiO 2 multicomponent catalyst with selective CO oxidation over Ag/ SiO 2 or Ag/Al 2 O 3 in one reactor.…”

Sensing of Soot Oxidation by Using Combustion-Type Sensor with Ag-Supported Catalyst

“…For instance, Ag has been used industrially for the epoxidation of ethylene (22,23) and the oxdehydrogenation of methanol to formaldehyde. (24)(25)(26) In addition, Ag is well-used for NO x abatement, (27,28) and the oxidation of ammonia, (29) methane, (30) carbon monoxide, (31) organic volatile compounds. (32) Ag with support materials such as ZrO 2 , TiO 2 , Al 2 O 3 and CeO 2 also showed remarkable performance for diesel soot oxidation.…”