Complete oxidation of o-xylene over Pd/Al2O3 catalyst at low temperature

Huang, Shaoyong; Zhang, Changbin; He, Hong

doi:10.1016/j.cattod.2008.08.020

Cited by 127 publications

(64 citation statements)

References 38 publications

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“…The TOF Co values confirm that the catalytic activity increased in the following order: CoAlO < Ag-CoAlO < Pt-CoAlO < Pd-CoAlO. It is important to note that the catalytic activity of Pd-CoAlO is much better than that of Pt-CoAlO, which is consistent with previously reported results for Pd/Al 2 O 3 and Pt/Al 2 O 3 [12]. Therefore, these results indicate that the Pd-CoAlO catalysts exhibit the best catalytic activity with the lowest reaction temperature and highest TOF values.…”

Section: Catalystsupporting

confidence: 90%

Pd–Co based spinel oxides derived from pd nanoparticles immobilized on layered double hydroxides for toluene combustion

Zhao

Jiang

et al. 2016

Applied Catalysis B: Environmental

219

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Section: Catalystsupporting

confidence: 90%

Pd–Co based spinel oxides derived from pd nanoparticles immobilized on layered double hydroxides for toluene combustion

Zhao

Jiang

et al. 2016

Applied Catalysis B: Environmental

219

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“…2a. In all cases the typical signals of c-Al 2 O 3 are present at 33°, 37.7°, 46°, 62°and 67° (Huang et al 2008). The organic portion of the composite is amorphous, so it does not produce diffraction peaks.…”

Section: Resultsmentioning

confidence: 90%

Hydrogenation of diacetyl over composite-supported egg-shell noble metal catalysts

et al. 2017

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Two composite supports with a mixed inorganic-organic structure were synthesized: BTAl and UTAl. Hydrophilic-hydrophobic dual properties of the supports were suitable for preparing egg-shell-supported metal catalysts for selective hydrogenation reactions. The catalysts were characterized by ICP, XRD, OM, TEM, EPMA, XPS and TGA. Their mechanical resistance was assessed. Activity and selectivity were tested with the hydrogenation of 2,3-butanedione (diacetyl) to 3-hydroxy-2-butanoneacetoin (acetoin). The same order of increasing metal particle size was found for the two tested supports: Pt \ Ru \ Pd. The XPS analysis showed that the metal/composite catalysts reduced in H2 at 503 K had two kinds of active sites: reduced (Me°) and electron-deficient (Me ? ). It was rationalized that the hydrogen bond cleavage was performed on the Me°active sites, while reactant adsorption occurred on the Me ? sites. The differences in activity and selectivity between the composite catalysts were attributed to electronic effects on the different metals and to different adsorptive properties of the different polymers. The high selectivity to acetoin was attributed to the preferential adsorption of diacetyl as compared to the adsorption of acetoin. The BTAl catalysts were slightly more active and selective than the UTAl ones. This was attributed to electronic effects caused by remnant organic groups on the composite supports (urethane or biphenyl on UTAl or BTAl, respectively). Pd-BTAl was the most active and selective catalyst, a fact related to electronic effects of both palladium and the support.

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“…19 The X-ray diffractograms of all catalysts had only three peaks at 2q = 37.7°, 46.0° (400) and 67.0° (440), corresponding to the structure of γ-Al 2 O 3 . 20 For this reason the difractograms are not presented. No peak at 39.7°, related to the (111) reflections of Pd 0 21 could be found, neither the peaks corresponding to the PdO or the peaks due to bulk NiO.…”

Section: Catalysts Characterizationmentioning

confidence: 99%

MORE ACTIVE AND SULFUR RESISTANT BIMETALLIC Pd-NI CATALYSTS

Betti¹,

Carrara²,

Badano³

et al. 2017

Quim. Nova

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The influence of the kind of metal precursor and the sequence of impregnation on the properties of Pd-Ni catalysts was evaluated during the test reaction of selective hydrogenation of styrene to ethylbenzene by means of physicochemical characterization. The focus was put on the final hydrogenating activity and the resistance to deactivation by sulfided compounds (thiophene). The used techniques of characterization were ICP, XPS, XDR, TPR, CO chemisorption and TEM. XPS results indicated the presence of different Pd species: Pd δ-, Pd 0 and Pd δ+ . In the case of the Ni containing catalysts, Ni 0 and NiO species were also detected. These palladium and nickel species would be responsables of the variation of activity and sulfurresistance of the catalysts. NiClPd catalysts had a higher resistance to deactivation by sulfur poisoning. This was associated to a higher concentration of Pd η+ Cl x O y species that would prevent the adsorption of thiophene by both steric and electronic effects. It could also be due to the lower concentration of Pd 0 and Ni 0 on these catalysts, as compared to those shown by the PdNiCl catalysts. Both the Pd 0 and Ni 0 species are more prone to poisoning because of their higher electronic availability.

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Complete oxidation of o-xylene over Pd/Al2O3 catalyst at low temperature

Cited by 127 publications

References 38 publications

Pd–Co based spinel oxides derived from pd nanoparticles immobilized on layered double hydroxides for toluene combustion

Pd–Co based spinel oxides derived from pd nanoparticles immobilized on layered double hydroxides for toluene combustion

Hydrogenation of diacetyl over composite-supported egg-shell noble metal catalysts

MORE ACTIVE AND SULFUR RESISTANT BIMETALLIC Pd-NI CATALYSTS

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