Decomposition of Freon-12 and Methyl Chloride over Supported Gold Catalysts

Aida, Takashi; Higuchi, Reiji; Niiyama, Hiroo

doi:10.1246/cl.1990.2247

Cited by 53 publications

(23 citation statements)

References 3 publications

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“…Because of the stability of Au toward halogens, some supported Au catalysts have been reported to be more active and stable for reactions involving halogens such as the oxidative decomposition of chlorofluorocarbons and dioxin and related compounds than other noble metal catalysts 107–110. It should be especially noted that AuCl 3 supported on activated carbon is the most active among metal chloride catalysts for the hydrochlorination of acetylene to produce vinyl chloride 107…”

Section: Reactions Catalyzed By Gold and Applicationsmentioning

confidence: 99%

When Gold Is Not Noble: Catalysis by Nanoparticles

Haruta

2003

The Chemical Record

1,113

765

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Bulk gold is chemically inert and is generally regarded as a poor catalyst. However, when gold is in very small particles with diameters below 10 nm and is deposited on metal oxides or activated carbon, it becomes surprisingly active, especially at low temperatures, for many reactions such as CO oxidation and propylene epoxidation. The catalytic performance of Au is defined by three major factors: contact structure, support selection, and particle size. The role of the perimeter interfaces of Au particles as the sites for reactions is discussed as well as the change in chemical reactivity of Au clusters composed of fewer than 300 atoms.

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Section: Reactions Catalyzed By Gold and Applicationsmentioning

confidence: 99%

When Gold Is Not Noble: Catalysis by Nanoparticles

Haruta

2003

The Chemical Record

1,113

765

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“…Gold supported on cobalt oxide or alumina are claimed to be as active as platinum catalysts for the oxidative decomposition of dichlorodifluoromethane and methyl chloride (16). For example, 5wt% AU/C0 304 can be used to completely decompose methyl chloride at around 600 K.…”

Section: Reactions With Halogenated Compoundsmentioning

confidence: 99%

New Advances in Gold Catalysis Part II

Thompson¹

1999

Gold Bull

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Some of the unique features of gold catalysis were described in Part 1. Further examples of reactions catalysed by supported transition metal oxides are given in this second part. These include both selective and complete oxidation of hydrocarbons and a number of hydrogenation reactions. In fact, gold has now been demonstrated to be the element of choice for some catalytic reactions. As a result, both chemical processing and environmental applications are foreseen for supported gold catalyst systems. In this, the second of two articles, the overall current state of knowledge on gold catalysis is reviewed and some early examples of homogeneous gold catalysis, in solution, assessed.Haruta (3) has shown (Figure 1) that catalytic activity, as expressed by temperature at 50%

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“…In order to develop even more efficient, selective, and sustainable catalysts, the suitability of gold catalysts in CVOC oxidation also needs to be investigated. 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.…”

Section: Introductionmentioning

confidence: 99%

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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Decomposition of Freon-12 and Methyl Chloride over Supported Gold Catalysts

Cited by 53 publications

References 3 publications

When Gold Is Not Noble: Catalysis by Nanoparticles

When Gold Is Not Noble: Catalysis by Nanoparticles

New Advances in Gold Catalysis Part II

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

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