The role of silver species on Ag/Al2O3 catalysts for the selective catalytic oxidation of ammonia to nitrogen

Role of the support on the behavior of Ag-based catalysts for NH 3 selective catalytic oxidation (NH 3 -SCO)

“…For this reason, the above results suggest that Al 2 O 3 is a more suitable support than the other three Ag-based catalysts for the SCO of NH 3 . The Al 2 O 3 supported silver catalysts exhibit the best NH 3 conversion (100%) and high N 2 selectivity (89%) at 180 • C. And the selectivity is higher than that (about 60%) reported in the previous work [11,12]. The possible reason should be related with the reduction temperature for Ag/Al 2 O 3 and the Ag 0 particle size.…”

“…The following parameters were used to collect data: 800-200 nm measurement range and 200 nm/min scanning speed. The measured spectra were converted into Kubelka-Munk functions and deconvoluted into Gaussian subbands that could be quantitatively assigned to the different Ag species [12,[18][19][20][21].…”

“…In low-temperature NH 3 -SCO reaction, Ag based catalyst has been proven to be one of the most active catalysts, but with a poor N 2 selectivity [10][11][12]. A lot of reports have demonstrated that the state of silver active species played an important role in the various reactions [13][14][15].…”

Role of hydrogen formation and silver phase for methanol-SCR over silver/alumina

“…4a are deconvoluted by fitting Gaussian peaks in the wavelength range 220-650 nm. Table 1 shows the wavelength of the apex of each fitted peak and the peak assignments, which are based on previous literature [28][29][30][31][32]. Fig.…”

Effect of TiO2 calcination temperature on the photocatalytic oxidation of gaseous NH3

“…NH 3 can be completely removed by selective catalytic oxidation using various catalysts such as metals, metal oxides and zeolites, but they cannot realize effective abatement of gaseous NH 3 at room temperature (Akah et al, 2005;Zhang et al, 2009;Cui et al, 2010). Photocatalytic oxidation (PCO) is a promising method for removing indoor air pollutants such as formaldehyde, volatile organic compounds, etc, under ultraviolet (UV) light irradiation at ambient temperature (Guo et al, 2008;Chen et al, 2009;Mo et al, 2009).…”