Shape effect of Pt/CeO 2 catalysts on the catalytic oxidation of toluene

Peng, Ruosi; Sun, Xibo; Li, Shujun; Chen, Limin; Fu, Mingli; Wu, Junliang; Ye, Daiqi

doi:10.1016/j.cej.2016.08.056

Cited by 318 publications

(160 citation statements)

References 57 publications

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“…For Pt-in/CNTs, the doublet at 71.3 and 74.6 eV is attributed to Pt 0 , and the doublet at 72.0 and 75.7 eV is assigned to Pt 2+ . By evaluating the compositions of different Pt species, we find that the percentage of Pt 0 /(Pt 0 +Pt 2+ ) is 52.5% (Table 1), which indicates the Pt precursor (H 2 PtCl 6 ) was reduced mostly to Pt 0 and slightly to Pt 2+ [35]. In the cases of Pt-imp/CNTs and Pt-out/CNTs, the percentages of Pt 0 /(Pt 0 +Pt 2+ ) are 35.0% and 31.3%, respectively, indicating that internal loading can promote the reduction of Pt 4+ and the formation of Pt 0 .…”

Section: Resultsmentioning

confidence: 99%

Hydrogenation of Phenol over Pt/CNTs: The Effects of Pt Loading and Reaction Solvents

Cao

Zhu

et al. 2017

Catalysts

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Carbon nanotubes (CNTs)-supported Pt nanoparticles were prepared with selective deposition of Pt nanoparticles inside and outside CNTs (Pt-in/CNTs and Pt-out/CNTs). The effects of Pt loading and reaction solvents on phenol hydrogenation were investigated. The Pt nanoparticles in Pt-in/CNTs versus Pt-out/CNTs are smaller and better dispersed. The catalytic activity and reuse stability toward phenol hydrogenation both improved markedly. The dichloromethane-water mixture as the reaction solvent, compared with either pure medium, decreased the catalytic activity toward phenol hydrogenation and selectivity of cyclohexanone over Pt-in/CNTs, but significantly improved the catalytic activity toward phenol hydrogenation and selectivity of cyclohexanone over Pt-out/CNTs.

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Section: Resultsmentioning

confidence: 99%

Hydrogenation of Phenol over Pt/CNTs: The Effects of Pt Loading and Reaction Solvents

Cao

Zhu

et al. 2017

Catalysts

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“…The Pt 4f spectra for the Pt-Au/Ce catalyst showed two different oxidation states of platinum. According to the literature, the two peaks at 76.0 and 72.7 eV are assigned to Pt 2+ , and the peaks at 77.2 and 74.4 eV are assigned to Pt 4+ [8,29,30].…”

Section: Binding Energy (Ev)mentioning

confidence: 99%

Catalytic Oxidation of Dimethyl Disulfide over Bimetallic Cu–Au and Pt–Au Catalysts Supported on γ-Al2O3, CeO2, and CeO2–Al2O3

et al. 2019

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Dimethyl disulfide (DMDS, CH 3 SSCH 3 ) is an odorous and harmful air pollutant (volatile organic compound (VOC)) causing nuisance in urban areas. The abatement of DMDS emissions from industrial sources can be realized through catalytic oxidation. However, the development of active and selective catalysts having good resistance toward sulfur poisoning is required. This paper describes an investigation related to improving the performance of Pt and Cu catalysts through the addition of Au to monometallic "parent" catalysts via surface redox reactions. The catalysts were characterized using ICP-OES, N 2 physisorption, XRD, XPS, HR-TEM, H 2 -TPR, NH 3 -TPD, CO 2 -TPD, and temperature-programmed 18 O 2 isotopic exchange. The performance of the catalysts was evaluated in DMDS total oxidation. In addition, the stability of a Pt-Au/Ce-Al catalyst was investigated through 40 h time onstream. Cu-Au catalysts were observed to be more active than corresponding Pt-Au catalysts based on DMDS light-off experiments. However, the reaction led to a higher amount of oxygen-containing byproduct formation, and thus the Pt-Au catalysts were more selective. H 2 -TPR showed that the higher redox capacity of the Cu-containing catalysts may have been the reason for better DMDS conversion and lower selectivity. The lower amount of reactive oxygen on the surface of Pt-containing catalysts was beneficial for total oxidation. The improved selectivity of ceria-containing catalysts after the Au addition may have resulted from the lowered amount of reactive oxygen as well. The Au addition improved the activity of Al 2 O 3 -supported Cu and Pt. The Au addition also had a positive effect on SO 2 production in a higher temperature region. A stability test of 40 h showed that the Pt-Au/Ce-Al catalyst, while otherwise promising, was not stable enough, and further development is still needed.Catalytic treatment is a suitable abatement technology for VOCs, especially when emission streams are complex and when the total VOC concentrations fluctuate. Catalytic oxidation is an environmentally sound destructive method and is highly feasible economically when heat-recovery-allowing processes such as reverse flow reactors (RFRs) are used. Catalytic oxidation of SVOCs is an attractive possibility: However, due to the presence of sulfur, the selectivity and stability of the catalysts need to be improved [2].The use of bimetallic catalysts in the total oxidation of gaseous dimethyl disulfide (DMDS) has not yet been extensively studied. Ojala [5] used Pt-Pd, Mn-Mg, Cu-Cr, and Cu-Mg-Cr catalysts supported on alumina or ceria-alumina in CH 3 SH and CH 3 SSCH 3 oxidation. Kucherov et al. [6,7] studied the removal of CH 3 OH, CH 3 SH, and CH 3 SSCH 3 from flue gases using Au-Rh/HZSM-5 catalysts. The experiments demonstrated high activity and good sulfur resistance at temperatures as low as 290 • C. studied the catalytic oxidation of CH 3 SSCH 3 over Pt-Cu catalysts and reported similarly promising results.Sulfate promotes the mobility of Pt particles on the catalys...

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“…However, the stability of potassium is poor, since evaporation leads to a loss of catalyst mass at high temperatures, which restricts the actual application of potassium-containing catalysts [25]. In this regard, other synthetic strategies have been proposed, including the control over particles' shape and size [11,26], the generation of Pt-based materials with hollow interiors [27], and bi-and trimetallic compositions [28,29]. Multimetallic catalysts have the advantage of tunable electronic and geometric properties through different combinations of metal components [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Performance and Stability of Wet-Milled CoAl2O4, Ni/CoAl2O4, and Pt,Ni/CoAl2O4 for Soot Combustion

et al. 2020

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Low-energy wet milling was employed to activate commercial CoAl2O4 spinel and disperse mono- and multimetallic nanoparticles on its surface. This method yielded efficient Pt,Ni catalysts for soot oxidation in simulated diesel exhaust conditions. The characterization and activity results indicated that although Ni/CoAl2O4 was highly active, the presence of Pt was required to obtain a stable Ni(0.25 wt. %),Pt(0.75 wt. %)/CoAl2O4 catalyst under the operating conditions of diesel particulate filters, and that hot spots formation must be controlled to avoid the deactivation of the cobalt aluminate. Our work provides important insight for new design strategies to develop high-efficiency low-cost catalysts. Platinum-containing multimetallic nanostructures could efficiently reduce the amount of the costly, but to date non-replaceable, Pt noble metal for a large number of industrially important catalytic processes.

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Shape effect of Pt/CeO 2 catalysts on the catalytic oxidation of toluene

Cited by 318 publications

References 57 publications

Hydrogenation of Phenol over Pt/CNTs: The Effects of Pt Loading and Reaction Solvents

Hydrogenation of Phenol over Pt/CNTs: The Effects of Pt Loading and Reaction Solvents

Catalytic Oxidation of Dimethyl Disulfide over Bimetallic Cu–Au and Pt–Au Catalysts Supported on γ-Al2O3, CeO2, and CeO2–Al2O3

Performance and Stability of Wet-Milled CoAl2O4, Ni/CoAl2O4, and Pt,Ni/CoAl2O4 for Soot Combustion

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