Effect of the pressure on the catalytic oxidation of volatile organic compounds over Ag/Al2O3 catalyst

Li, Yang; Zhang, Xiuli; He, Hong; Yu, Yunbo; Yuan, Tao; Tian, Zhen‐Yu; Wang, Jing; Li, Yuyang

doi:10.1016/j.apcatb.2009.01.029

Cited by 41 publications

(35 citation statements)

References 19 publications

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“…Both of these advantages of VUV-PIMS may also provide an opportunity for identification of the reactive gas phase intermediates created by Ag/Al 2 O 3 during the HC-SCR and give deeper insight into its mechanism if this technique is employed properly. In fact, by using this powerful method, ethenol in the gas phase, an important intermediate during the catalytic oxidation of C 2 -C 4 alcohols over the Ag/Al 2 O 3 catalyst, was unambiguously identified, 164,219 further confirming the formation of surface enolic species during the NO x reduction by ethanol over Ag/Al 2 O 3 .…”

Section: Reactivity Of Intermediates Originating From Partial Oxidatimentioning

confidence: 77%

“…164 The PIE spectra of m/z = 44 (C 2 H 4 O) (Fig. 3B) at low pressure unambiguously illustrate the presence of ethenol (CH 2 QCH-OH), with an ionization threshold of 9.33 eV.…”

Section: Partial Oxidation Of Oxygenated Hydrocarbons Over Ag/al 2 Omentioning

confidence: 83%

“…The intermediates in the gas phase such as acetaldehyde, ethenol, and 2-butenal were confirmed by VUV-PIMS measurement. 164 Surface enolic species, acetate, and -NCO were identified by DRIFTS and DFT calculations. 165,173 (Reproduced with permission from Elsevier Inc.) 165 principally reacts with oxygen to form acetaldehyde, which is followed by isomerization to ethenol.…”

Section: Partial Oxidation Of Oxygenated Hydrocarbons Over Ag/al 2 Omentioning

confidence: 99%

“…Meanwhile, the occurrence of aldol condensation of acetaldehyde, which has been confirmed by PIMS and TPD-MS measurement, may lead to the formation of C 4 enolic species (CH 2 QCH-CHQCH-O À )-M + as shown in Scheme 5. 164,173 Obviously, if the formation of surface enolic species follows the hypothesis described above, two prerequisites must be met. First, the selected reductant must contain at least one C-C bond.…”

Section: Partial Oxidation Of Oxygenated Hydrocarbons Over Ag/al 2 Omentioning

confidence: 99%

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Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects

2014

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Selective catalytic reduction of NO x using NH 3 or hydrocarbons (NH 3 -SCR or HC-SCR) in oxygen-rich exhaust from diesel engines remains a major challenge in environmental catalysis. The development of highly efficient, stable and environmentally-benign catalysts for SCR processes is very important for practical use. In this feature article, the structure-activity relationship of vanadium-free catalysts in the NH 3 -SCR reaction is discussed in detail, including Fe-, Ce-based oxide catalysts and Fe-, Cu-based zeolite catalysts, which is beneficial for catalyst redesign and activity improvement. Based on our research, a comprehensive mechanism contributing to the performance of Ag/Al 2 O 3 in HC-SCR is provided, giving a clue to the design of a catalytic system with high efficiency.

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Section: Reactivity Of Intermediates Originating From Partial Oxidatimentioning

confidence: 77%

“…164 The PIE spectra of m/z = 44 (C 2 H 4 O) (Fig. 3B) at low pressure unambiguously illustrate the presence of ethenol (CH 2 QCH-OH), with an ionization threshold of 9.33 eV.…”

Section: Partial Oxidation Of Oxygenated Hydrocarbons Over Ag/al 2 Omentioning

confidence: 83%

Section: Partial Oxidation Of Oxygenated Hydrocarbons Over Ag/al 2 Omentioning

confidence: 99%

Section: Partial Oxidation Of Oxygenated Hydrocarbons Over Ag/al 2 Omentioning

confidence: 99%

See 2 more Smart Citations

Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects

2014

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“…Previous research has identified that the enolic species also plays a key role in NOx reduction by other alcohols (isopropyl alcohol, 1-propanol, 1-butanol) over Ag/Al 2 O 3 [20][21][22], acetaldehyde over Ag/Al 2 O 3 [16] and Co/Al 2 O 3 [23], and acetylene over ZSM-5 [24]. Interestingly, substantial quantities of enols in the gas phase have been observed by photoionization mass spectrometry during hydrocarbon combustion [25] and catalytic oxidation [26]. The above results strongly suggest that adsorbed enolic species and/or enols in the gas phase are common intermediates involved in the partial oxidation chemistry of hydrocarbons and oxygenated hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

Remarkable influence of reductant structure on the activity of alumina-supported silver catalyst for the selective catalytic reduction of NOx

Song

2010

Journal of Catalysis

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a b s t r a c tThis study investigated the selective catalytic reduction of NOx over alumina-supported silver catalyst by butyl alcohol isomers. Butyl alcohol (BA), sec-butyl alcohol (SBA), and isobutyl alcohol (IBA) showed similarly high efficiency for NOx reduction at low temperatures, while tert-butyl alcohol (TBA) exhibited a much lower performance. In situ diffuse reflectance infrared Fourier transform spectroscopy was used to clarify the remarkable influence of the alcohol structure on NOx reduction. A high surface concentration of enolic species was observed during the partial oxidation of BA, IBA, and SBA, leading to a high concentration of isocyanate species and high NOx conversion. However, due to the absence of a-H, it was difficult to partially oxidize TBA to form the enolic species, which resulted in its low efficiency for NOx reduction. Based on the results obtained, a mechanism was proposed to explain the close relationship between the structure feature of alcohols and NOx reduction efficiency.

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Photoionization Mass Spectrometry for Online Detection of Reactive and Unstable Gas‐Phase Intermediates in Heterogeneous Catalytic Reactions

You

Huang

2019

ChemCatChem

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Heterogeneous catalytic reactions always involve surface intermediates on catalyst surfaces, and some of them also involve reactive and unstable gas-phase intermediates such as radicals and alkyl hydroperoxides. Online detection of these gas-phase intermediates is of great importance for fundamentally understanding reaction mechanisms of relevant heterogeneous catalytic reactions, designing structures of efficient catalysts and optimizing reactors. However, it has remained a long-time challenge due to the lack of routine characterization techniques. Herein we review recent progress on applications of photoionization mass spectrometry in online detection of reactive and unstable gas-phase intermediates in heterogeneous catalytic reactions. The development and advantages of photoionization mass spectrometry and the relevant equipment setup for heterogeneous catalysis studies are also described. Finally, a future perspective is given.[a] Dr. * (m/z = 15), C 2 H 5 * (m/z = 29) and allyl radical (CH 2 CHCH 2 * 4 5 6 7 8

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Effect of the pressure on the catalytic oxidation of volatile organic compounds over Ag/Al2O3 catalyst

Cited by 41 publications

References 19 publications

Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects

Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects

Remarkable influence of reductant structure on the activity of alumina-supported silver catalyst for the selective catalytic reduction of NOx

Photoionization Mass Spectrometry for Online Detection of Reactive and Unstable Gas‐Phase Intermediates in Heterogeneous Catalytic Reactions

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Effect of the pressure on the catalytic oxidation of volatile organic compounds over Ag/Al2O3 catalyst

Cited by 41 publications

References 19 publications

Environmentally-benign catalysts for the selective catalytic reduction of NOxfrom diesel engines: structure–activity relationship and reaction mechanism aspects

Environmentally-benign catalysts for the selective catalytic reduction of NOxfrom diesel engines: structure–activity relationship and reaction mechanism aspects

Remarkable influence of reductant structure on the activity of alumina-supported silver catalyst for the selective catalytic reduction of NOx

Photoionization Mass Spectrometry for Online Detection of Reactive and Unstable Gas‐Phase Intermediates in Heterogeneous Catalytic Reactions

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Product

Resources

About

Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects

Environmentally-benign catalysts for the selective catalytic reduction of NO_xfrom diesel engines: structure–activity relationship and reaction mechanism aspects