Hydrodechlorination of 1,2-dichloroethane on Pd–Ag catalysts supported on tailored texture carbon xerogels

Job, Nathalie; Heinrichs, Benoı̂t; Ferauche, Fabrice; Noville, Francis; Marien, J.; Pirard, Jean‐Paul

doi:10.1016/j.cattod.2005.02.021

Cited by 66 publications

(47 citation statements)

References 17 publications

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“…It is known that upgrading HdCl catalytic performance would be achieved by doping palladium with another, usually less active, metal, like silver [10][11][12][13][14], copper [15] and gold [16]. In this respect our recent report on HdCl of CCl 4 on carbon-supported Pd-Au clearly shows that good intermixing of the both metals is crucial for getting a superior catalytic performance [16].…”

Section: Introductionmentioning

confidence: 93%

Effect of silver on the catalytic hydrodechlorination of tetrachloromethane over silica-supported palladium-silver catalysts

Bonarowska

Kaszkur

Karpiński

2015

Recyclable Catalysis

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Two silica-supported palladium based catalysts characterized by overall metal loadings 10 wt.%, and atomic Pd : Ag ratios of 100 : 0 and 70 : 30, were prepared by incipient wetness impregnation, subjected to reduction in hydrogen and characterized by XRD. It was found that incipient wetness co-impregnation of silica resulted in the formation of a catalyst characterized by relatively small metal crystallites (~11 nm) and significant extent of Pd-Ag alloying. The catalytic performance was investigated in the hydrodechlorination of tetrachloromethane in the gas phase. Silver addition to palladium in the co-impregnated catalysts had very pronounced effect, vastly decreasing the overall activity (conversion) and also the selectivity towards hydrocarbons, propensity characteristic for the monometallic palladium catalysts working in CCl4 hydrodechlorination carried out in the gas phase. Instead, large amounts of C2HxCly dimeric products were formed. These dimers are considered as possible coke precursors. Post-reaction samples of both catalysts contained large amount of carbon which entered the Pd and Pd-Ag phases. This carbon can be easily removed by treatment with hydrogen at 450ºC.

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Section: Introductionmentioning

confidence: 93%

Effect of silver on the catalytic hydrodechlorination of tetrachloromethane over silica-supported palladium-silver catalysts

Bonarowska

Kaszkur

Karpiński

2015

Recyclable Catalysis

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“…In particular, porous carbons derived from drying and pyrolysis of these gels are promising for many applications. The high specific surface areas and conductivity obtained make these materials good candidates for the elaboration of electrodes for supercapacitors, batteries or fuel cells [3][4][5]; the low thermal conductivities observed are interesting for the development of thermal insulators; the ability to tailor the pore texture of the carbon materials is a great advantage in the fields of adsorption and catalysts supports [6][7][8]. However, the original process developed by Pekala is long and very difficult to apply at large scale.…”

Section: Introductionmentioning

confidence: 99%

Synthesis optimization of organic xerogels produced from convective air-drying of resorcinol–formaldehyde gels

Job

Panariello

Marien

et al. 2006

Journal of Non-Crystalline Solids

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107

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Resorcinol-formaldehyde gels were produced at 50, 70 and 90°C and with three different R/C ratios (500, 1000 and 2000). The effect of these variables combined with that of aging time was studied in order to optimize the synthesis conditions. The convective air-drying process was used, and the drying duration was studied with regard to the synthesis conditions. The aging time has no effect on the pore texture after 24 h at 90°C or 48 h at 70°C, whatever the R/C value. The synthesis-aging step can be shortened by increasing the temperature.Nevertheless, the pore size tends then to decrease, especially when R/C is high, but this can be counterbalanced by increasing R/C. Moreover, bubbles often appear in the gel at high synthesis temperature, which limits the temperature to about 70°C in the case of monolithic parts. At 70°C and with an air velocity of 2 m/s, the elimination of 90% of the solvent Manuscript 2 requires 1 h drying when the pore size reaches 400-600 nm, 2.5 h for 50 nm wide pores and 3 h when the pore size decreases to 15-20 nm. The drying duration does not exceed 8 h in all cases and could be shortened by increasing the temperature at the end of the process.

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“…This phenomenon is unparalleled in the scientific literature. The excellent hydrogenation activity of palladium usually leads to formation of saturated hydrocarbons as the main reaction products [26][27][28].…”

Section: Temperature-programmed Reductionmentioning

confidence: 99%

Active carbon-supported nickel–palladium catalysts for hydrodechlorination of 1,2-dichloroethane and 1,1,2-trichloroethene

Kamińska

Śrębowata

2015

Res Chem Intermed

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Norit active carbon-supported Ni-Pd catalysts were prepared, by incipient wetness impregnation, from the metal chlorides NiCl 2 Á6H 2 O and PdCl 2 . The catalysts were characterized by temperature-programmed reduction, X-ray diffraction, and scanning electron microscopy, and by temperature-programmed hydrogenation (TPH) of the catalysts after use. When the catalysts were used for gasphase hydrodechlorination (HDC) of 1,2-dichloroethane (1,2-DCA) and 1,1,2-trichloroethene (TCE), very high activity and stability at a relatively low reaction temperature (503 K) were observed. Hydrodechlorination of TCE led to formation of hydrocarbons as the main products. Use of Ni and Ni-Pd catalysts for hydrodechlorination of 1,2-DCA resulted in very high (*100 %) selectivity for ethene. TPH of the catalysts after use for HDC of 1,2-DCA and TCE revealed the presence of carbon and chlorine-containing deposits on the surfaces of the catalysts. Formation of the NiC x fcc phase and the Ni 3 C hcp carbide phase were detected for the monometallic nickel and Ni95Pd05 catalysts.

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Hydrodechlorination of 1,2-dichloroethane on Pd–Ag catalysts supported on tailored texture carbon xerogels

Cited by 66 publications

References 17 publications

Effect of silver on the catalytic hydrodechlorination of tetrachloromethane over silica-supported palladium-silver catalysts

Effect of silver on the catalytic hydrodechlorination of tetrachloromethane over silica-supported palladium-silver catalysts

Synthesis optimization of organic xerogels produced from convective air-drying of resorcinol–formaldehyde gels

Active carbon-supported nickel–palladium catalysts for hydrodechlorination of 1,2-dichloroethane and 1,1,2-trichloroethene

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