In situ IR spectroscopy of intermediates in heterogeneous oxidative catalysis

Матышак, В. А.; Крылов, О. В.

doi:10.1016/0920-5861(95)00067-p

Cited by 128 publications

(64 citation statements)

References 132 publications

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“…A similar band at 2200 cm À1 upon NH 3 oxidation on ZnO has been assigned to adsorbed N 2 O [27]. The appearance of more than one form of adsorbed N 2 O is often explained by the simultaneous presence of N-and O-bonded molecules and/or by adsorption on different sites.…”

Section: Ftir Study Of Nh 3 Adsorptionmentioning

confidence: 86%

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

Zhang

2009

Journal of Catalysis

193

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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Section: Ftir Study Of Nh 3 Adsorptionmentioning

confidence: 86%

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

Zhang

2009

Journal of Catalysis

193

127

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“…The oxidation reaction of propylene has been intensively studied on various catalysts and the mechanism is understood. 21 The above results suggests that the reaction route between C 3 H 6 and O 2 on the Rh-Al-MCM-41…”

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confidence: 95%

“…21 The shoulders at 1490 and 1372 cm -1 are due to π-allyl complex (π-C 3 H 5 ) and allylic species, respectively. 21,26 The assignments of these bands are summarized in Table 2. These results indicate that oxidation of C 3 H 6 took place on the 20,21 Increasing temperature resulted in an increase of CO 2 bands but a decrease of CO adspecies bands.…”

mentioning

confidence: 99%

“…21,26 The assignments of these bands are summarized in Table 2. These results indicate that oxidation of C 3 H 6 took place on the 20,21 Increasing temperature resulted in an increase of CO 2 bands but a decrease of CO adspecies bands. The oxidation reaction of propylene has been intensively studied on various catalysts and the mechanism is understood.…”

mentioning

confidence: 99%

“…3b) The appearance of the band at 1594 cm -1 indicates the formation of polyene species. 21 The shoulders at 1490 and 1372 cm -1 are due to π-allyl complex (π-C 3 H 5 ) and allylic species, respectively. 21,26 The assignments of these bands are summarized in Table 2.…”

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confidence: 99%

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Pillared Clays as Superior Catalysts for Selective Catalytic Reduction of Nitric Oxide

Yang¹,

Long²

1999

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In the last annual reports, we reported Cu-exchanged pillared clays as superior selective catalytic reduction (SCR) catalysts. During the past year we explored the possibilities with MCM-41, a new class of molecular sieve. In this report, Rh exchanged Al-MCM-41 is studied for the SCR of NO by C 3 H 6 in the presence of excess oxygen. It shows a high activity in converting NO to N 2 and N 2 O at low temperatures.

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Selective Self‐Condensation of Butanal over Zr‐BEA Zeolites

2019

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Butanal conversion has been studied over Zr‐BEA zeolites with different amount of partially hydrolyzed open Zr‐sites and fully condensed closed sites. The kinetic study pointed that the main reaction pathway of butanal conversion involves its self‐condensation into 2‐ethyl‐2‐hexenal (2‐EN), the selectivity to 2‐EN being within 80–85 %. Besides, small amounts of 1‐butanol and butanoic acid are formed via Cannizzaro disproportionation of butanal. Secondary reactions include butanoic acid ketonization to 4‐heptanone and esterification to butyl butanoate and tandem hydrogenation/dehydration of 2‐EN into octadienes. A number of techniques, including FTIR spectroscopy of adsorbed CO, pyridine, 2,6‐di‐tert‐butylpyridine (DTBPy), TPD of isopropylamine and selective poisoning with DTBPy were applied for characterization of Zr‐sites and elucidation of their activity. Open Zr‐sites were found to be more active with respect to closed Zr‐sites in butanal condensation: the TOF values estimated at 433 K being 1.4 s−1 for open Zr‐sites and 0.6 s−1 for closed sites. On the contrary, selectivity into 2‐EN was similar for open and closed sites. The results point that Zr‐BEA catalysts with enhanced content of open sites are perspective catalysts for the selective synthesis of 2‐EN.

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In situ IR spectroscopy of intermediates in heterogeneous oxidative catalysis

Cited by 128 publications

References 132 publications

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

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

Pillared Clays as Superior Catalysts for Selective Catalytic Reduction of Nitric Oxide

Selective Self‐Condensation of Butanal over Zr‐BEA Zeolites

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