Preparation and characterization of supported mononuclear metal complexes as model catalysts

Kenvin, Jeffrey; White, Mark G.; Mitchell, Mark B.

doi:10.1021/la00054a030

Cited by 100 publications

(92 citation statements)

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“…The CH 4 might be thought to have arisen from the decomposition of acetylacetonate groups; however, because the IR spectra in the m COO region characterizing the sample in the presence of CO show that the acetylacetonate bands remained essentially unchanged (consistent with reports [25,26] showing that decomposition of other metal acetylacetonate complexes to give CH 4 does not occur at a significant rate at room temperature), we conclude that the source of gas-phase CH 4 is other than the decomposition of acetylacetonate groups.…”

Section: Reactions Of Au(ch 3 ) 2 (C 5 H 7 O 2 ) Physisorbed In Zeolisupporting

confidence: 78%

Zeolite NaY-supported gold complexes prepared from Au(CH3)2(C5H7O2): reactivity with carbon monoxide

et al. 2005

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Mononuclear gold complexes in zeolite NaY were synthesized from initially physisorbed Au(CH 3 ) 2 (C 5 H 7 O 2 ), and their reactions with CO in a flow system at 298 K and 760 Torr were investigated by infrared (IR) spectroscopy and mass spectral analysis of the effluent gases. CH 4 and CO 2 were formed as CO flowed through the sample either steadily or as successive pulses. The results are consistent with the inferences that (a) CO reacted with the supported gold to form gold carbonyls, (b) CH 4 formed by reaction of methyl groups on gold with traces of H 2 O or hydroxyl groups on the zeolite and (c) CO on cationic gold reacted with traces of O 2 and/or H 2 O to form CO 2 . In samples treated in steadily flowing CO, cationic gold was reduced to zerovalent gold, but the cationic gold in samples exposed to CO pulses was not reduced to zerovalent gold, although CO 2 formed. Thus, CO adsorbed on cationic gold reacts to give CO 2 in the absence of zerovalent gold, consistent with the inference that gold catalysts for CO oxidation need not contain zerovalent gold.

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Section: Reactions Of Au(ch 3 ) 2 (C 5 H 7 O 2 ) Physisorbed In Zeolisupporting

confidence: 78%

Zeolite NaY-supported gold complexes prepared from Au(CH3)2(C5H7O2): reactivity with carbon monoxide

et al. 2005

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“…First, the quasi p-electron system of the acac ligands of Cr(acac) 3 molecules and surface hydroxyl groups ligands may be involved in hydrogen bonding with the sur-was suggested without a detailed analysis of the structure face hydroxyl groups (3,5). Second, surface hydroxyl of surface species which were formed.…”

Section: Introductionmentioning

confidence: 99%

Thermal Transformations of Chromium Acetylacetonate on Silica Surface

Babich

Plyuto

Voort

et al. 1997

Journal of Colloid and Interface Science

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“…Low intensity of hydroxyl groups vibrations in high-wave number region (3800-3300 cm -1 ) and broad peaks in the range of 3500-2200 cm -1 , which were observed for pure Pd(acac) 2 , indicate the presence of enolate form of acetylacetone ligands [25]. Chelate O-bonded form is also evidenced in the fingerprint region [26][27]. Strong IR vibrations observed in the range of 1600-1500 cm -1 can be attributed to the conjugated CO vibrations in a complex ring.…”

Section: Resultsmentioning

confidence: 84%

Application of microemulsion method for development of methanol steam reforming Pd/ZnO catalysts

Pawlonka

Gac

Greluk

et al. 2016

J Therm Anal Calorim

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Thermal decomposition of palladium acetylacetonate adsorbed on zinc oxide (ZnO), and the formation of palladium oxide (PdO) and palladium zinc alloy (PdZn) phases were studied. Two types of ZnO supports were prepared by the microemulsion method using different surfactants, i.e. hexadecyltrimethylammonium bromide (CTAB) and (Bis(2-ethylhexyl) sulfosuccinate sodium salt, AOT). The nanoparticles of ZnO synthesized in the presence of CTAB surfactant showed higher specific surface area, smaller crystallite size and more irregular shape. Palladium was loaded on the surface of obtained supports by the impregnation method from the acetone solution of palladium acetylacetonate. Thermogravimetric studies indicated that palladium precursor loaded on CTAB-modified ZnO support was less stable and simultaneously decomposed in broader range of temperatures. Slight differences between the forms of precursors adsorbed on the supports were demonstrated by the diffuse reflectance infrared Fourier transform spectroscopy studies. Thermal decomposition of palladium acetylacetonate precursors in the air led to the formation of PdO species. The influence of ZnO morphology on the metal-oxygen bonds strength in PdO and formation of active phases were observed. Strongly dispersed PdZn crystallites on ZnO supports were formed upon reduction at 350°C. Smaller crystallites of the size equal to 6.5 nm were detected in the Pd/ZnO-AOT catalysts.

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Preparation and characterization of supported mononuclear metal complexes as model catalysts

Cited by 100 publications

References 1 publication

Zeolite NaY-supported gold complexes prepared from Au(CH3)2(C5H7O2): reactivity with carbon monoxide

Zeolite NaY-supported gold complexes prepared from Au(CH3)2(C5H7O2): reactivity with carbon monoxide

Thermal Transformations of Chromium Acetylacetonate on Silica Surface

Application of microemulsion method for development of methanol steam reforming Pd/ZnO catalysts

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