Pulse Transient Responses of NO Decomposition and Reduction with H2on Ag−Pd/Al2O3

Miller, Duane D.; Chuang, Steven S. C.

doi:10.1021/jp904538t

Cited by 17 publications

(14 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This finding is consistent with the fact that N 2 O is a daughter reduction intermediate of NO 2 − and builds up to detectable levels in the reactor headspace when monitoring NO 2 − reduction in this study (Figure 1), as well as previous studies reporting on reduction of NO 3 − , NO 2 − , and NO 25. 35, 36…”

Section: Resultssupporting

confidence: 93%

“…It is worth noting that NO can be reduced to form N 2 O, N 2 , and NH 3 according to results from gas phase catalysis studies, although various temperatures, pressures, and metals were involved. For example, Miller and co‐workers36 observed N 2 , N 2 O, and NH 3 during reduction of NO pulsed with H 2 over Pd/Al 2 O 3 at 773 K, and Hornung and co‐workers39 observed the same products for NO reduction by H 2 on Ru/γ‐Al 2 O 3 . Van Hardeveld and co‐workers40 studied NH 3 formation during NO x reduction on a three‐way Ru catalyst, and proposed that NO first dissociates to N ads and O ads on catalyst surfaces, followed by stepwise hydrogenation of N ads to form NH 3 .…”

Section: Resultsmentioning

confidence: 96%

See 1 more Smart Citation

Zur Dauerhaftigkeit von befahrenen Parkdecks in Regelwerken

Wiens¹,

Meyer²,

Raupach

2015

Beton und Stahlbetonbau

View full text Add to dashboard Cite

Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 96%

Zur Dauerhaftigkeit von befahrenen Parkdecks in Regelwerken

Wiens¹,

Meyer²,

Raupach

2015

Beton und Stahlbetonbau

View full text Add to dashboard Cite

“…Single animals were observed with binoculars from a distance while defecating, making it possible to attribute most faecal samples to the particular sex (59%). Sexing was performed by the careful evaluation of sex-specific characteristics, such as shape and length of the horns, behaviour, urination and general appearance (Miller & Corlatti 2009). While a few individuals may have been sampled twice or more times, drawing samples from a finite distribution will not differ whether or not a sample is replaced.…”

Section: S T U D Y a R E A A N D S A M P L E C O L L E C T I O Nmentioning

confidence: 99%

Faecal cortisol metabolites to assess stress in wildlife: evaluation of a field method in free‐ranging chamois

et al. 2015

View full text Add to dashboard Cite

1. Non-invasive faecal cortisol metabolite (FCM) analysis is a well-established tool to quantify stress in captive and free-ranging species. While the method has great potential, its suitability in field studies might be limited when faecal samples from unknown individuals are used. Possible factors affecting final results and thus jeopardizing correct data interpretation are individual and sex-specific variation, storage conditions and uneven distribution of metabolites in the faeces. 2. We tested these factors on a population of free-ranging Alpine chamois Rupicapra rupicapra rupicapra in the Austrian Alps. Faecal samples (n = 183) were analysed with an established enzyme immunoassay (EIA). To further validate the assay for FCM in chamois, a high-performance liquid chromatography (HPLC) was performed. Sex-specific differences in metabolite excretion were evaluated. Effects of storage length and temperature on FCM were tested with two experiments. The distribution of metabolites in the faeces was determined by the analysis of subsamples of single faecal samples. Potential individual effects on FCM levels and individually variable reactions to stressful events were evaluated with a simulation experiment. 3. Patterns of immunoreactive peaks after HPLC separation were similar for different faecal samples, except in one sample of a male. In the stability tests, storage time at ambient temperature prior to freezing and the individual were the most important variables in modulating FCM. Concentrations within single samples varied significantly between pellets. Analysis of faecal samples collected from June to October showed a highly significant seasonal trend (P < 0Á001) and a considerable variance of FCM levels within the population. Simulations confirmed that individual reactions to stressors in terms of varying gradients and FCM levels can explain the observed FCM patterns. 4. Using FCM to assess adrenocortical function requires measuring extensively metabolized products of glucocorticoids, whose excretion and detection in faeces depend on several environmental, endogenous and methodological factors. In free-ranging wildlife, these factors and the intrinsic individual differences in FCM excretion generate systemic noise and substantially distort final results. Therefore, sampling of unknown individuals inevitably jeopardizes meaningful interpretation of data, if the above named factors are not taken into consideration.

show abstract

“…Catalysts, such as precious metals [12][13][14], single metal oxides [15,16], Cu-ZSM-5 [17][18][19], alkali-doped Co 3 O 4 [20,21], perovskites [22][23][24][25][26], C-type cubic rare earth oxides [27,28], and Ba 0.5 /BaY 2 O 4 [29], have been found to be effective for direct decomposition of NO. We found that Ba-Ce-Co mixed oxides prepared by a polymerized complex method showed high NO decomposition activities [30].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Highly Effective CeO x –MnO y –BaO Catalysts for Direct NO Decomposition

et al. 2011

View full text Add to dashboard Cite

Ce-Mn mixed oxides with a Mn/(Ce ? Mn) molar ratio of 0.25 were prepared by solvothermal (ST-1) and co-precipitation (CP) methods, and Ba was loaded on the Ce-Mn oxides. In addition, CeO 2 -MnO x -BaO catalysts with various compositions were directly prepared by the solvothermal (ST-2) method. The NO decomposition activities of these catalysts were examined. Among the catalysts examined, the ST-2 catalyst having a nominal composition of Ce 0.8 Mn 0.15 Ba 0.05 O x exhibited the highest activity; 77% NO conversion to N 2 was attained at 800°C. These catalysts were characterized by X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The Raman and XPS results indicate that the CP catalyst had larger amounts of the BaMnO 3-d and/or Mn 3 O 4 phases. The ST-1 and ST-2 catalysts had highly dispersed Ba species on the surface. The ST-2 catalyst had Mn species with the lowest binding energy of Mn 2p and also had a high population of oxygen vacancies in the ceria lattice, suggesting that Mn species with a low oxidation state contributes to the formation of oxygen vacancies, which play an important role in this reaction.

show abstract

Pulse Transient Responses of NO Decomposition and Reduction with H₂on Ag−Pd/Al₂O₃

Cited by 17 publications

References 61 publications

Zur Dauerhaftigkeit von befahrenen Parkdecks in Regelwerken

Zur Dauerhaftigkeit von befahrenen Parkdecks in Regelwerken

Faecal cortisol metabolites to assess stress in wildlife: evaluation of a field method in free‐ranging chamois

Synthesis of Highly Effective CeO x –MnO y –BaO Catalysts for Direct NO Decomposition

Contact Info

Product

Resources

About