An investigation of the role of surface nitrate species in the oxidation of propene on a Pt-based diesel oxidation catalyst

Chansai, Sarayute; Burch, Robbie; Hardacre, Christopher; Oh, Harry; Epling, William S.

doi:10.1039/c3cy00349c

Cited by 11 publications

(5 citation statements)

References 46 publications

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“…νCH features at 2962 cm 1 increased over the temperature ramp, further substantiating the formation of surface formate species on the alumina [30,31]. Other peaks related to the formate species can be observed at 1332, 1370, 1395 and 1665 cm 1 [21,23,32,33]. There is also evidence of bands at lower temperatures, 21852190 cm 1 , corresponding to CO on alumina's Lewis acid sites, as well as Hbonded CO on hydroxyl sites on the alumina at 2160 cm 1 [34].…”

Section: Co Tpomentioning

confidence: 64%

“…The formation of formates on Pt/Al 2 O 3 during propylene oxidation has been reported in the literature, with bands associated with said formates at 1332, 1370, 1395 and 1665 cm 1 , all of which were observed during the propylene TPO, Figure 9 a). Peaks that have been associated with an acetate species at 1457 cm 1 , and carboxylate species at 1580, 1642 and 1672 cm 1 [21,23,32,33] are also evident. Again the feature at 2962 cm 1 was observed (Figure 9 b)), and this time was present over the entire temperature range.…”

Section: H 6 Tpomentioning

confidence: 93%

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Spatially resolving CO and C3H6 oxidation reactions in a Pt/Al2O3 model oxidation catalyst

Hazlett

Epling

2016

Catalysis Today

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Spatially resolved Fourier transform infrared spectroscopy (SpaciIR) was used to measure gas phase concentration profiles during CO and C 3 H 6 oxidation reactions over a Pt/Al 2 O 3 monolith supported catalyst. The reaction conditions were selected as representative of certain low temperature combustion (LTC) engine exhaust conditions, where in this study higher concentrations of CO, C 3 H 6 and lower concentrations of NO x were used relative to standard engine exhaust. CO and C 3 H 6 oxidation and NO X reduction reactions were examined individually and in combination via temperature programmed oxidation (TPO) experiments. Significant NO X reduction occurred right at CO and C 3 H 6 light off, and NO oxidation only occurred after the oxidation of CO and C 3 H 6. C 3 H 6 oxidation was not observed until after most of the CO oxidized, as CO was more strongly adsorbed to the active site surface at low temperature. During the TPO of CO and C 3 H 6 , the conversion versus temperature profiles did not monotonically increase; two inflections were observed where the rate of conversion change as a function of temperature slowed over a small temperature range before again accelerating with temperature. Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) was used in order to characterize intermediates that were present on the surface at the temperatures where these steps were noted. Surface ethylene and formate species were present during the first step, with acetate and formate in the second step. The inhibition steps were therefore attributed to the partial oxidation of propylene to ethylene, and then the subsequent partial oxidation of ethylene to acetate.

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Section: Co Tpomentioning

confidence: 64%

Section: H 6 Tpomentioning

confidence: 93%

Spatially resolving CO and C3H6 oxidation reactions in a Pt/Al2O3 model oxidation catalyst

Hazlett

Epling

2016

Catalysis Today

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“…For each test, the catalysts were evaluated at different temperature varied from 250 to 500 °C. In situ diffuse reflectance infrared Fourier-transform J o u r n a l P r e -p r o o f spectroscopy-mass spectrometry (DRIFTS-MS) characterisation of the catalysis over the developed catalysts was performed with the detailed procedure described elsewhere [1,23]. Specifically, for each experiment, the catalyst was loaded into a ceramic crucible in the IR cell and reduced (at 400 C in a 10% H2/Ar flow for 1 h then cooled to 40 °C).…”

Section: Catalytic Co2 Hydrogenation Under Thermal and Ntp Conditionsmentioning

confidence: 99%

Effect of metal dispersion and support structure of Ni/silicalite-1 catalysts on non-thermal plasma (NTP) activated CO2 hydrogenation

Chen

Goodarzi

et al. 2020

Applied Catalysis B: Environmental

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“…Wilbum et al found that a smaller Pt–Pd particle size could promote the formation of aluminum sulfate species in investigating SO 2 adsorption and desorption by TPD and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Meanwhile, IR studies could efficiently help to investigate the intermediate species. − Recently, Liu et al adopted in situ DRIFTS and found the specific changes of NO x related species in bismuth compounds. In the deNO x process, it was observed that SCR performance were improved by active NO x species. , Furthermore, how adsorption active sites and acid sites affect the adsorbed NO x species in NH 3 –SCR reaction has been investigated by Zhang group. , Thus, it was interesting to study the effect of noble bimetal particle size on the catalytic NO oxidation activity of the monolithic aged DOC catalysts by in situ FTIR.…”

Section: Introductionmentioning

confidence: 99%

Advanced Insight into the Size Effect of PtPd Nanoparticles on NO Oxidation by in Situ FTIR Spectra

Liang

Zhang

et al. 2018

Ind. Eng. Chem. Res.

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It is a recognized view that particle size could play a significant role in catalytic performance. To obtain the nanoparticles with the different size, a series of bimetallic PtPd/SiO 2 −Al 2 O 3 catalysts subjected to hydrothermal treatment in different time were prepared and applied for NO oxidation under diesel exhaust. The experimental results confirmed that the average noble particle size was gradually increased at a different variation rate, along with aging time. An increasing of average particle size resulted in the reduction of the corresponding NO turnover frequencies (TOFs) by different degrees. Thus, a new sight on the relationship between particle size and NO catalytic activity is obtained. In the aging process, the overall trend of noble metal particles got larger along with receding NO catalytic performance, yet in a period, a few small particles presented more bridged/chelating nitrate and ionic nitrate species, further retarding its rate of loss activity.

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An investigation of the role of surface nitrate species in the oxidation of propene on a Pt-based diesel oxidation catalyst

Cited by 11 publications

References 46 publications

Spatially resolving CO and C3H6 oxidation reactions in a Pt/Al2O3 model oxidation catalyst

Spatially resolving CO and C3H6 oxidation reactions in a Pt/Al2O3 model oxidation catalyst

Effect of metal dispersion and support structure of Ni/silicalite-1 catalysts on non-thermal plasma (NTP) activated CO2 hydrogenation

Advanced Insight into the Size Effect of PtPd Nanoparticles on NO Oxidation by in Situ FTIR Spectra

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