Activity and product distribution of alumina supported platinum and palladium catalysts in the gas-phase oxidative decomposition of chlorinated hydrocarbons

González‐Velasco, Juan R.; Aranzabal, A.; Gutiérrez-Ortiz, José I.; López‐Fonseca, Rubén; Gutiérrez-Ortiz, M.A.

doi:10.1016/s0926-3373(98)00078-2

Cited by 134 publications

(59 citation statements)

References 27 publications

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“…For example, at 450°C, PCE conversion was only about 15%. We are not aware of other studies on H 2 -free PCE oxidation on similar catalysts, but the trend and the conversion efficiencies here are similar to TCE oxidation on a similar catalyst [8,11]. On the other hand, purely reductive conditions (i.e., O 2 free) resulted in rapid catalyst deactivation, which will be discussed further in Section 3.2.…”

Section: Effect Of H 2 /O 2 Ratio and Temperature On Pce Conversionmentioning

confidence: 53%

“…Cu, Cr, and Mn); supported noble metal catalysts (e.g. Pt, Pd); and noble metal/metal oxide combinations [8][9][10][11][12]. Detailed kinetics of catalytic oxidation on noble metals is not firmly established, but may follow either a Langmuir-Hinshelwood type of mechanism (reaction between adsorbed oxygen and an adsorbed reactant) or an Eley-Rideal mechanism (reaction between adsorbed oxygen and a gas-phase reactant molecule) [13].…”

Section: Catalytic Oxidation Reactionsmentioning

confidence: 99%

“…A sequential mechanism can be represented as follows: (8) where * refers to an active site on the catalytic surface or an adsorbed species that is activated. Reaction 4 (and 6, etc.…”

Section: Catalytic Hydrodechlorination Reactionsmentioning

confidence: 99%

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Catalytic dechlorination of gas-phase perchloroethylene under mixed redox conditions

Orbay¹,

Gao²,

Barbaris³

et al. 2008

Applied Catalysis B: Environmental

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The validity of a new method to destroy gas-phase perchloroethylene (PCE) is demonstrated at bench scale using a fixed-bed reactor that contains a Pt/Rh catalyst. Hydrogen and oxygen were simultaneously fed to the reactor together with PCE. The conversion efficiencies of PCE were sensitive to H 2 /O 2 ratio and reactor temperature. When the temperature was ≥ 400 °C and H 2 /O 2 was ≥ 2.15, PCE conversion efficiency was maintained at ≥ 90%. No catalyst deactivation was observed for over two years, using only mild, convenient regeneration procedures. It is likely that PCE reduction steps precede oxidation reactions and that the importance of oxidation lies in its elimination of intermediates that would otherwise lead to catalyst poisoning. In practice, this catalytic dechlorination method holds potential for low-cost, large-scale field operation.

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Section: Effect Of H 2 /O 2 Ratio and Temperature On Pce Conversionmentioning

confidence: 53%

Section: Catalytic Oxidation Reactionsmentioning

confidence: 99%

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Catalytic dechlorination of gas-phase perchloroethylene under mixed redox conditions

Orbay¹,

Gao²,

Barbaris³

et al. 2008

Applied Catalysis B: Environmental

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“…In fact, H-type zeolites are poor Deacon catalysts in comparison with metals which are extremely active for this reaction, leading to the formation of undesired chlorine [60]. We observed that using bronzes catalysts the formation of chlorine is very small, suggesting that these catalysts inhibit the Cl 2 formation through the Deacon process.…”

Section: Selectivitymentioning

confidence: 78%

Catalytic abatement of trichloroethylene over Mo and/or W-based bronzes

Blanch-Raga

Soriano

Palomares

et al. 2013

Applied Catalysis B: Environmental

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“…In order to make the reaction economically attractive, highly active catalysts at low temperatures are required. Supported precious metals such as Pt and Pd are well established as efficient catalysts for VOC combustion [1 ] and palladium is cheaper and often more active for oxidation than platinum [2]. Moreover, iron is often used for catalytic oxidation of VOCs [3] and could imply special properties of the catalyst for deactivation [4].…”

Section: Introductionmentioning

confidence: 99%

Catalytic properties of beta zeolite exchanged with Pd and Fe for toluene total oxidation

Jacquemin

Siffert

Lamonier

et al. 2002

Studies in Surface Science and Catalysis

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Dealuminated beta zeolites exchanged with Pd and Fe were prepared to investigate the influence of iron and dealumination on the activity and selectivity of Pd/BEA zeolite for toluene total oxidation. The specific areas determined by BET method and EPR studies allowed to know that the palladium would be more easily agglomerated on the BEA than on the DBEA. Moreover, a quantification of the palladium saturation on the BEA zeolite was deduced by EPR. Effects of dynamic and static oxidation and weak and strong reduction treatments were studied by EPR. Several isolated and interacted Pd + species and hole centers were detected. The Pd was much reduced after the catalytic test in dealuminated and Fe doped samples. This result could be directly correlated to the catalytic deactivation. The deactivation could be also explain by the type of coke deposed on the catalyst and by the hydroscopic behavior of the samples. Addition of Fe or dealumination could prevent the deactivation and then lead to better catalysts for VOCs oxidation.

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Activity and product distribution of alumina supported platinum and palladium catalysts in the gas-phase oxidative decomposition of chlorinated hydrocarbons

Cited by 134 publications

References 27 publications

Catalytic dechlorination of gas-phase perchloroethylene under mixed redox conditions

Catalytic dechlorination of gas-phase perchloroethylene under mixed redox conditions

Catalytic abatement of trichloroethylene over Mo and/or W-based bronzes

Catalytic properties of beta zeolite exchanged with Pd and Fe for toluene total oxidation

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