Investigations of coke deposits formed during deep oxidation of benzene over Pd and Cu exchanged Y-type zeolites

Becker, L.; Förster, H.

doi:10.1016/s0926-860x(96)00344-4

Cited by 34 publications

(16 citation statements)

References 17 publications

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“…6 at 1590 cm À1 . This is believed to be a vibration of polyaromatic systems and similar bands were previously assigned to surface ''coke'' on zeolites [27]. The intensity of this polyaromatic ''coke'' band appears to increase together in the spectra of Fig.…”

Section: Ftir Studiessupporting

confidence: 79%

“…6 with the intensity of bands at 1850 and 1783 cm À1 (C=O bond) even after exposure of the catalyst to mNpht for several hours, suggesting the formation and surface accumulation of polyaromatic compounds containing carbonyl groups. Similar polyaromatic compounds, containing oxygenated fragments were also observed on zeolites during the oxidation of benzene [27].…”

Section: Ftir Studiessupporting

confidence: 63%

“…A band at 1342 cm À1 shows the same increase in intensity as the band at 1730 cm À1 and can be assigned to the C-O vibration of this lactonic structure [27]. The lactone-type surface species observed may be similar to the 2H-naphtho [1,8]furan-2-one species detected during the offline MS analysis.…”

Section: Ftir Studiesmentioning

confidence: 64%

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Deactivation of V2O5/TiO2 catalysts during the oxidation of meta-dichlorobenzene in the presence of methyl-naphthalene

Lichtenberger

Amiridis

2004

Catalysis Today

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Section: Ftir Studiessupporting

confidence: 79%

Section: Ftir Studiessupporting

confidence: 63%

See 1 more Smart Citation

Deactivation of V2O5/TiO2 catalysts during the oxidation of meta-dichlorobenzene in the presence of methyl-naphthalene

Lichtenberger

Amiridis

2004

Catalysis Today

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“…In 1997, Becker and Fçrster studied the total oxidation of toluene, benzene, and xylene over ion-exchanged Y-type zeolites. [16][17][18] They discovered that PdY zeolites offered the best performance in the oxidation of these three VOCs, with H 2 O and CO 2 as the only products of this reaction. They also discussed the negative effect of water on the conversion ratio at low temperatures, as water is known to partially deactivate zeolites.…”

Section: Zeolites For the Catalytic Oxidation Of Vocsmentioning

confidence: 99%

Noble‐Metal‐Based Catalysts Supported on Zeolites and Macro‐Mesoporous Metal Oxide Supports for the Total Oxidation of Volatile Organic Compounds

et al. 2011

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The use of porous materials to eliminate volatile organic compounds (VOCs) has proven very effective towards achieving sustainability and environmental protection goals. The activity of zeolites and macro-mesoporous metal-oxide supports in the total oxidation of VOCs has been investigated, with and without noble-metal deposition, to develop highly active catalyst systems where the formation of by-products was minimal. The first catalysts employed were zeolites, which offered a good activity in the oxidation of VOCs, but were rapidly deactivated by coke deposition. The effects of the acido-basicity and ionic exchange of these zeolites showed that a higher basicity was related to exchanged ions with lower electronegativities, resulting in better catalytic performances in the elimination of VOCs. Following on from this work, noble metals were deposited onto macro-mesoporous metal-oxide supports to form mono and bimetallic catalysts. These were then tested in the oxidation of toluene to study their catalytic performance and their deactivation process. PdAu/TiO(2) and PdAu/TiO(2) -ZrO(2) 80/20 catalysts demonstrated the best activity and life span in the oxidation of toluene and propene and offered the lowest temperatures for a 50 % conversion of VOCs and the lowest coke content after catalytic testing. Different characterization techniques were employed to explain the changes occurring in catalyst structure during the oxidation of toluene and propene.

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“…The oxidation of various hydrocarbons, e.g. benzene [19], toluene, benzene and xylene [20] and other organic materials [21], has already been investigated with similar catalysts. However, these chemical processes are costly and energy intensive.…”

Section: Introductionmentioning

confidence: 99%

An integrated system of biological and catalytic oxidation for the removal of o-xylene from exhaust

Zhang

et al. 2007

Catalysis Today

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Biofiltration is an efficient technology for treatment of gaseous waste. Its disadvantages, however, include large volume of bioreactor and slow adaptation to fluctuating concentrations in waste gas. Catalytic oxidation offers a high destructive efficiency at relatively low operating temperature and small unit. A bench scale system integrated with a biofilter and a catalytic oxidation unit for the treatment of gases containing o-xylene was investigated in this study. The catalytic oxidation unit was packed with Cu/Al 2 O 3 catalyst. The results showed that 90% of o-xylene could be removed in the biofilter at the load below 38.2 g m À3 h À1. High o-xylene concentration in inlet gas resulted in an overload of the biofilter. Using the Cu/Al 2 O 3 catalytic oxidation unit, the concentration of o-xylene could be reduced evidently. The combination of the chemical and microbial processes not only led to a high and stable efficiency of o-xylene conversion, but also improved capacity resisting the shock loads. The Cu/Al 2 O 3 was studied for o-xylene oxidation in temperature range of 90-320 8C. The o-xylene conversion was improved correspondingly with the increasing of oxidation temperature. The reaction mechanism of o-xylene oxidation on Cu/Al 2 O 3 was also investigated using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). #

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Investigations of coke deposits formed during deep oxidation of benzene over Pd and Cu exchanged Y-type zeolites

Cited by 34 publications

References 17 publications

Deactivation of V2O5/TiO2 catalysts during the oxidation of meta-dichlorobenzene in the presence of methyl-naphthalene

Deactivation of V2O5/TiO2 catalysts during the oxidation of meta-dichlorobenzene in the presence of methyl-naphthalene

Noble‐Metal‐Based Catalysts Supported on Zeolites and Macro‐Mesoporous Metal Oxide Supports for the Total Oxidation of Volatile Organic Compounds

An integrated system of biological and catalytic oxidation for the removal of o-xylene from exhaust

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