IR spectroscopy study of NO adsorption and NO + O2 co-adsorption on Al2O3

Venkov, Tzvetomir; Hadjiivanov, Konstantin; Klissurski, D.

doi:10.1039/b111396h

Cited by 87 publications

(87 citation statements)

References 38 publications

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“…Furthermore, the intensity of the band at 1197 cm −1 ascribed to the bridged nitrate species was gradually weakened, and the intensity of the band at 1389 cm −1 (nitrate species) [18] was decreased slightly. Additionally, H 2 O with the surface O H stretching bands at 3800-3500 cm −1 was observed [47,49], which indicated that the water is produced. These results were based on the comprehensive analysis which indicated that the bridged nitrate species (1610 cm −1 ) might react with the NH 3 adspecies directly, and other NO x ad-species could be transformed into bridged nitrate species (1610 cm −1 , see equations (7)-(11)).…”

Section: The Reaction Between No + O 2 Ad-species and Nh 3 On Mno X /mentioning

confidence: 93%

“…These suggest partial oxidation (activation) of NH 3 into -NH 2 species intermediates in the presence of Mn 3+ species [43], which was in agreement with the XPS results (see Table S1). In addition, the bands at 3743, 3675 and 3610 cm −1 due to -OH group [47,49] in Fig. 4 were developed at the same pace with amide species (-NH 2 ), these indicated that reactions of the adsorbed NH 3 with MnO x which described by the following equations:…”

Section: Ammonia Adsorptionmentioning

confidence: 98%

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In situ FT-IR study of highly dispersed MnO x /SAPO-34 catalyst for low-temperature selective catalytic reduction of NO x by NH 3

Huang

Dong

et al. 2017

Catalysis Today

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Section: The Reaction Between No + O 2 Ad-species and Nh 3 On Mno X /mentioning

confidence: 93%

Section: Ammonia Adsorptionmentioning

confidence: 98%

In situ FT-IR study of highly dispersed MnO x /SAPO-34 catalyst for low-temperature selective catalytic reduction of NO x by NH 3

Huang

Dong

et al. 2017

Catalysis Today

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“…In addition, a weak band at 1750 cm À1 was also seen. Based on the previous studies of the NO + O 2 reaction on Al 2 O 3 or Ag/Al 2 O 3 catalysts, these peaks were tentatively assigned to adsorbed N 2 O 4 (1750 cm À1 ) and monodentate (1545 cm À1 ), bidentate (1579 cm À1 ), and bridging (1614 cm À1 ) nitrates [26,28,[31][32][33][34]. The bands at 1456 and 1302 cm À1 were close to the IR bands at 1411 and 1302 cm À1 for adsorbed water-solvated surface nitrates on Al 2 O 3 [31].…”

Section: Ftir Study Of No + O 2 Adsorptionmentioning

confidence: 99%

Mechanism of selective catalytic oxidation of ammonia to nitrogen over Ag/Al2O3

Zhang

2009

Journal of Catalysis

203

127

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Mechanism O 2 uptake In situ DRIFTS a b s t r a c tThe mechanism of selective catalytic oxidation (SCO) of NH 3 over Ag/Al 2 O 3 was studied by NH 3 temperature-programed oxidation, O 2 -pulse adsorption, and in situ DRIFTS of NH 3 adsorption and oxidation. The essence which affects the low temperature activity of Ag/Al 2 O 3 has been elucidated through the mechanism study. Different Ag species on Ag/Al 2 O 3 significantly influence O 2 uptake by catalysts; while different oxygen species affect the activity of NH 3 oxidation at low temperature. The activated -NH could react with the atomic oxygen (O) at low temperatures (<140°C); however, the -NH could also interact with the O 2 at temperatures above 140°C. At low temperatures (<140°C), NH 3 oxidation follows the -NH mechanism. However, at temperatures above 140°C, NH 3 oxidation follows an in situ selective catalytic reduction (iSCR) mechanism (two-step formation of N 2 via the reduction of an in situ-produced NO x species by a NH x species).

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“…These nitrate species adsorbed on ␥-Al 2 O 3 were in the form of bridged (1258, 1628 cm −1 ), bidentate (1300, 1604 cm −1 ) and monodentate nitrates (1300, 1564 cm −1 ) [37,72]. Additionally, the weak band located at ∼1958 cm −1 that was formed after NO x adsorption on the poisoned surface is associated with the adsorbed NO + and/or weakly adsorbed N 2 O 3 [73]. The poisoning of the ␥-Al in Fig.…”

Section: 4mentioning

confidence: 99%