Decomposition of Freon-12 and Chlorinated Organic Compounds over Supported Gold Catalysts.

Aida, Takashi; Higuchi, Reiji; Niiyama, Hiroo

doi:10.1252/kakoronbunshu.17.943

Cited by 10 publications

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“…Aida et al [ 22 ] studied Au catalysts having different loadings on a number of metal oxides in methyl chloride (CH 3 Cl) oxidation. Another study by Aida et al [ 23 ] included experiments with 1.4 wt.% Au/TiO 2 catalyst in methyl chloride oxidation and 5 wt.% Au/Al 2 O 3 catalyst in methyl chloride, DCM, chloroform (CHCl 3 ), and carbon tetrachloride (CCl 4 ) oxidation. Based on these studies [ 22 , 23 ], Aida et al concluded that, after some stability improvement, the Au/Al 2 O 3 catalyst could be a promising catalyst for the decomposition of halogenated organic compounds due to its high activity and HCl selectivity.…”

Section: Introductionmentioning

confidence: 99%

“…Another study by Aida et al [ 23 ] included experiments with 1.4 wt.% Au/TiO 2 catalyst in methyl chloride oxidation and 5 wt.% Au/Al 2 O 3 catalyst in methyl chloride, DCM, chloroform (CHCl 3 ), and carbon tetrachloride (CCl 4 ) oxidation. Based on these studies [ 22 , 23 ], Aida et al concluded that, after some stability improvement, the Au/Al 2 O 3 catalyst could be a promising catalyst for the decomposition of halogenated organic compounds due to its high activity and HCl selectivity. Chen et al [ 24 ] investigated DCM oxidation using Au/Co 3 O 4 , Co 3 O 4 , Cr 2 O 3 /Al 2 O 3 , Pd/Al 2 O 3 , and Pt/Al 2 O 3 catalysts.…”

Section: Introductionmentioning

confidence: 99%

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Oxidation of Dichloromethane over Au, Pt, and Pt-Au Containing Catalysts Supported on γ-Al2O3 and CeO2-Al2O3

2020

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Au, Pt, and Pt-Au catalysts supported on Al2O3 and CeO2-Al2O3 were studied in the oxidation of dichloromethane (DCM, CH2Cl2). High DCM oxidation activities and HCl selectivities were seen with all the catalysts. With the addition of Au, remarkably lower light-off temperatures were observed as they were reduced by 70 and 85 degrees with the Al2O3-supported and by 35 and 40 degrees with the CeO2-Al2O3-supported catalysts. Excellent HCl selectivities close to 100% were achieved with the Au/Al2O3 and Pt-Au/Al2O3 catalysts. The addition of ceria on alumina decreased the total acidity of these catalysts, resulting in lower performance. The 100-h stability test showed that the Pt-Au/Al2O3 catalyst was active and durable, but the selectivity towards the total oxidation products needs improvement. The results suggest that, with the Au-containing Al2O3-supported catalysts, DCM decomposition mainly occurs via direct DCM hydrolysis into formaldehyde and HCl followed by the oxidation of formaldehyde into CO and CO2.

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