Dehalogenative oligomerization of dichlorodifluoromethane catalyzed by activated carbon-supported Pt–Cu catalysts: effect of Cu to Pt atomic ratio

Chakraborty, Debashis; Kulkarni, Parag; Kovalchuk, Vladimir I.; d’Itri, Julie L.

doi:10.1016/j.cattod.2003.11.012

Cited by 23 publications

(19 citation statements)

References 56 publications

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“…This also contrasts with heterogeneous CO oxidation studies for the same catalysts, which showed enhanced activity upon Cu incorporation. The disparate catalysis data were interpreted in terms of a surface enrichment in Cu under the hydrogenation reaction conditions, driven by the lower heat of sublimation of Cu [36,97,98] .…”

Section: Catalysis By Supported Bimetallic Dendrimer Templated Nanopamentioning

confidence: 99%

PAMAM Dendrimer Templated Nanoparticle Catalysts

Chandler

Gilbertson

2007

Nanoparticles and Catalysis

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Section: Catalysis By Supported Bimetallic Dendrimer Templated Nanopamentioning

confidence: 99%

PAMAM Dendrimer Templated Nanoparticle Catalysts

Chandler

Gilbertson

2007

Nanoparticles and Catalysis

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“…However, many studies focused on gas-phase hydrodechlorination of chlorometanes, such as dichloromethane (DCM) and chloroform (TCM), using supported metallic catalysts do not include stability tests or they report a rapid deactivation of the catalysts [2,3,4,5,6]. The literature presents different explanations for that deactivation, namely, poisoning by chlorinated organic species and/or HCl, coke formation, metal sintering or changes in the metal oxidation state [7,8,9,10,11]. In the last years, in order to increase the activity and/or stability, or modulate the selectivity, the use of bimetallic catalysts has been more in-depth investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Pt–Pd molar ratio in bimetallic catalysts supported on sulfated zirconia on the gas-phase hydrodechlorination of chloromethanes

Bedia

Arevalo-Bastante

Grau

et al. 2017

Journal of Catalysis

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Bimetallic Pt:Pd catalysts with different molar ratios and 0.5 wt% overall metal load supported on sulfated zirconia catalysts (SZ) were synthesized and tested in the gas-phase hydrodechlorination (HDC) of chloromethanes and their mixtures. The catalysts were characterized by adsorption-desorption of N2 at-196 ºC, X-ray diffraction, X-ray photoelectronic spectroscopy, temperature programmed reduction and aberration corrected scanning transmission electron microscopy (STEM). The effect of the Pt:Pd molar ratio on the activity, stability and selectivity was analyzed. The high acidity of the sulfated zirconia results in metal particles of small size (mainly < 5 nm) as confirmed by STEM. The bimetallic catalysts showed higher stability than the monometallic ones as demonstrated in long term experiments (80 h on stream), confirming the positive effect 2 of combining both metallic phases. TOF values in the range of 0.0007 to 0.0168 s-1 and apparent activation energies between ≈ 41-44 kJ•mol-1 were obtained. TOF values for dichloromethane HDC increased at increasing mean metal particle size within the range of this work (≈1.2-2.3 nm). The catalysts with Pt:Pd molar ratios of 1:3 and 1:1 showed significantly better performance than the 3:1 one for overall dechlorination due to their higher atomic metal content and TOF at the same total metal weight load (0.5%).

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“…In gas-phase HDC, deactivation of noble metal catalysts has been linked to poisoning by HCl and/or Cl, formation of carbonaceous deposits, loss of metal through the formation of volatile chlorides, and metal sintering [8,16,23,[27][28][29][30][31]. However, most of these studies do not address the HDC of CMs and very few publications refer to activated carbon-supported noble metal catalysts.…”

Section: Introductionmentioning

confidence: 99%