Effect of electron irradiation on the catalytic properties of supported Pd catalysts

Pribytkov, A. S.; Баева, Г. Н.; Telegina, N. S.; Тарасов, А. Л.; Stakheev, A. Yu.; Telnov, Alexander; Golubeva, V. N.

doi:10.1134/s0023158406050168

Cited by 21 publications

(8 citation statements)

References 12 publications

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“…Similarly, Wallis et al [24] reported that due to plasma catalyst interactions, less parent Ti-O bonds are found on TiO 2 surfaces. Pribytkov et al [37] and Jun et al [46] both agreed that in hybrid plasma catalyst configurations new types of active sites with unusual and valuable catalytic properties may be formed. Similar conclusions were taken by Roland et al [8] who observed stable Al_O_O * paramagnetic species formation (lifetime >14 days).…”

Section: Physical-chemical Effects During Plasma Catalytic Processesmentioning

confidence: 82%

“…NTP proved to influence the stability and catalytic activity of the exposed catalyst materials. Secondly, the oxidation state of the material can be influenced when exposed to plasma discharge [8,20,24,37,46]. To support this, a Mn 2 O 3 catalyst was exposed to a non-thermal plasma (energy density of 756 J L À1 ) for 40 h. After this experiment Mn 3 O 4 was detected, this lower-valent manganese oxide is known to have a larger oxidation capability [20].…”

Section: Physical-chemical Effects During Plasma Catalytic Processesmentioning

confidence: 99%

“…Recent papers indicate that combining catalysts with NTP may result in physical-chemical changes such as a shift of mean electron energy, change of discharge type, effect on catalyst properties or an impact on the VOC adsorption process (Fig. 2) [8,10,37]. 2.1.1.…”

Section: Physical-chemical Effects During Plasma Catalytic Processesmentioning

confidence: 99%

See 2 more Smart Citations

Combining non-thermal plasma with heterogeneous catalysis in waste gas treatment: A review

Durme¹,

Dewulf²,

Leys³

et al. 2008

Applied Catalysis B: Environmental

675

379

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Plasma driven catalysis is a promising technology for waste gas treatment characterized by higher energy efficiencies, high mineralization rates and low by-product formation. The combination of heterogeneous catalysts with non-thermal plasma can be operated in two configurations: positioning the catalyst in the discharge zone (in-plasma catalysis) or downflow the discharge zone (post plasma catalysis).In a first part of the review, changes of plasma properties resulting from the introduction of catalyst material are discussed. It has been reported that discharge types can even change. Accordingly, it was reported that microdischarges are formed within the catalyst pores. Changing plasma characteristics can eventually result in enhanced production of new active species, increasing the oxidizing power of the plasma discharge.In a second part, it is discussed that plasma discharges also affect catalyst properties such as a change in chemical composition, enhancement in surface area or change of catalytic structure. These phenomena partially explain why catalyst adsorption kinetics of airborne pollutants are affected when exposed to plasma discharges.It is also reviewed that the synergy of combining plasma with catalysts can not only be attributed to the production of new reactive species. Also plasma photon emission or thermal hot-spots can initiate catalytic pollutant oxidation reactions.To conclude, an overview of recently published manuscripts concerning plasma catalysis for volatile organic compounds abatement is given. It is also discussed why heterogeneous plasma catalysis has high potential for the simultaneous abatement of NO x and hydrocarbons. #

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Section: Physical-chemical Effects During Plasma Catalytic Processesmentioning

confidence: 82%

Section: Physical-chemical Effects During Plasma Catalytic Processesmentioning

confidence: 99%

See 1 more Smart Citation

Combining non-thermal plasma with heterogeneous catalysis in waste gas treatment: A review

Durme¹,

Dewulf²,

Leys³

et al. 2008

Applied Catalysis B: Environmental

675

379

View full text Add to dashboard Cite

show abstract

“…It has been shown by Guo et al [18] that extended DBD operation (750 J l -1 for 40 h) with an in situ Mn 2 O 3 catalyst supported on nickel foam, can convert the catalyst to a more favourable oxide, Mn 3 O 4 , which is know to have a larger oxidation capability. Similarly it has been reported that one-stage operation of electron beam and catalyst can form new types of active sites on catalysts which have valuable catalytic properties [19,20].…”

Section: Discussionmentioning

confidence: 99%

The Effect of Temperature on the Plasma-Catalytic Destruction of Propane and Propene: A Comparison with Thermal Catalysis

Blackbeard

Demidyuk

Hill

et al. 2009

Plasma Chem Plasma Process

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A comparison has been made of plasma-catalysis with thermal-catalysis and plasma alone for the removal of low concentrations of propane and propene from synthetic air using a one-stage, catalyst-in discharge configuration. In all cases, plasma-catalysis produces better hydrocarbon destructions (*40%) than thermal catalysis at low temperatures. At higher temperatures, little difference is observed between plasma-catalytic and thermal-catalytic operation. Plasma operation by itself had a similar effectiveness to plasma-catalysis at low temperatures but was significantly lower (up to 50%) as the temperature was raised. By examining the form of the temperature dependence for the plasma-catalytic destruction processes, it is possible to phenomenologically distinguish two contributions to the destruction; one that is specifically plasma-induced and another (at higher temperatures) in which both plasma and thermal activation have similar mechanisms.

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“…However XPS study of the catalysts after e-beam irradiation and reduction treatment indicates that chlorine is not detected on the catalyst surface. Therefore we can presume that chlorine does not significantly affect the catalytic properties of the catalysts [5]. Grant is gratefully acknowledged.…”

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confidence: 99%

Effect of electron beam-irradiation on the structure and catalytic performance of Pd nanoparticles supported on Al2O3 and carbon

Pribytkov

Ткаченко

Stakheev

et al. 2006

Mendeleev Communications

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Electron beam irradiation of Pd/Al 2 O 3 and Pd/C increased dispersion of Pd nanoparticles and activity in toluene hydrogenation by a factor 3-4.Nontraditional methods of catalyst activation (plasma treatment, microwave irradiation) attract significant attention of researchers working in the field of heterogeneous catalysis. Use of these non traditional methods allows obtaining of the new types of active sites on the catalyst surface possessing higher activity and/or selectivity.One of the promising methods is the irradiation catalysts by an electron beam [1 -3]. However, the literature data on studying an impact of the electron irradiation is scarce. The aim of this study consists in an evaluation of an impact electron beam on the structure and activity of Pd catalysts in toluene hydrogenation. 1%Pd/Al 2 O 3 catalyst was prepared using γ-Al 2 O 3 (BET surface area 120 m 2 /g). 1%Pd/C catalyst was prepared from carbon support «Sibunit» (BET surface area 330 m 2 /g). The catalysts were prepared by incipient wetness impregnation withThe activation of the catalysts by the electron beam irradiation was carried out using a LU-10-24 linear resonance electron accelerator in flowing air. The electron energy was 7.7 MeV. The irradiation dose was varied from 120 to 600 Mrad. The catalyst activity in the gas-phase toluene hydrogenation was evaluated using a flow type reactor operated at the atmospheric pressure at 100 -200 0 C. The analysis of the reaction products was performed by gas chromatography. Before catalytic runs the catalyst was reduced in the catalytic reactor at 250 0 C in the flowing hydrogen. Apparent activation energy of toluene hydrogenation was evaluated within a range of low toluene conversion (<15%).EXAFS measurements were carried out at HASYLAB (DESY, Hamburg) on the beam line X1 with the use of the double-crystal Si(311) monochromator. The EXAFS spectra were recorded in transmission mode in He flow at 80 K. Initial catalyst (before reduction) were studied. The catalysts after toluene hydrogenation were studied after the re-reduction in 5%vol H 2 in He in-situ special EXAFS cell at 250°C.Before spectra acquisition the samples were purged with He for 30 min in order to destroy Pd hydride formed in the course of the reductive treatment. The analysis of the EXAFS spectra was performed using the program VIPER for Windows [6]. The details of quantitative information extraction from EXAFS data and Pd particles size estimation are given in [7].The data on the impact of the electron irradiation on the catalytic activity of 1%Pd/Al 2 O 3 catalyst in the gas-phase toluene hydrogenation are given in Table 1. It is evident, that the catalyst activity is significantly improved with increasing irradiation dose from 10 to 600 Mrad. The toluene conversion at 200 °С increases from 32 % over parent catalyst to 58 and 100% with increasing electron irradiation dose to 240 and 600 Mrad respectively. Noteworthy that apparent activation energies of toluene hydrogenation for the parent catalyst and e-beam irradiated samples a...

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Effect of electron irradiation on the catalytic properties of supported Pd catalysts

Cited by 21 publications

References 12 publications

Combining non-thermal plasma with heterogeneous catalysis in waste gas treatment: A review

Combining non-thermal plasma with heterogeneous catalysis in waste gas treatment: A review

The Effect of Temperature on the Plasma-Catalytic Destruction of Propane and Propene: A Comparison with Thermal Catalysis

Effect of electron beam-irradiation on the structure and catalytic performance of Pd nanoparticles supported on Al2O3 and carbon

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