Characterization of Boron-Nitride-Supported Pt Catalysts for the Deep Oxidation of Benzene

Lin, Chin-Hsien; Wu, Jeffrey C.S.; Pan, Jen-Wei; Yeh, Chien-Jui

doi:10.1006/jcat.2002.3638

Cited by 74 publications

(50 citation statements)

References 19 publications

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“…The large difference of the observed adsorption energy values is in agreement with previous studies in which a weaker interaction of metals with boron nitride support, compared to c-Al 2 O 3 , was suggested [20]. The difference above could be attributed to the absence of oxygenated moieties in the BN supports.…”

Section: Adsorption Of Pd 30 Clustersupporting

confidence: 91%

α-d-Glucopyranose Adsorption on a Pd30 Cluster Supported on Boron Nitride Nanotube

et al. 2016

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Boron nitride nanotube (BNNT) as an innovative support for carbohydrate transformation processes was evaluated, using density functional theory. The a-D-glucopyranose adsorption on a Pd 30 cluster, supported on BNNT, was used to check both the local activity of topologically different metallic sites and the effects of the proximity of the BNNT surface to the same metallic sites. Detailed geometrical and electronic analyses performed on Pd 30 /BNNT and a-D-glucopyranose/Pd 30 /BNNT systems were discussed. It was observed that the deposition of the Pd 30 cluster onto the BNNT support gives rise to an electronic rearrangement, determining a charge transfer from the support to the adsorbed metal cluster. The charge transfer, as shown by the analysis of molecular electrostatic potential, seems to generate electron-rich and electron-poor zones in the Pd 30 cluster. The a-D-glucopyranose species, regardless the interaction geometry experienced, acts as an electron donor and preferentially adsorbs close to the electron-poor metal/support interface.

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Section: Adsorption Of Pd 30 Clustersupporting

confidence: 91%

α-d-Glucopyranose Adsorption on a Pd30 Cluster Supported on Boron Nitride Nanotube

et al. 2016

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“…The Pt particles on Pt/BN are more easily maintained in their reduced state, as was concluded in the previous characterization, a result that is believed to be the most important in causing the difference between the activities of Pt/BN and Pt/γ-Al 2 O 3 . 4 Weaker bonding between Pt and ad-oxygen on Pt/BN is thought to be responsible for supplying the more reactive surface oxygen atoms in the deep oxidation of methanol. Moreover, the low activity of Pt/γ-Al 2 O 3 is believed to result from the strong bonding between Pt and ad-oxygen and the presence of a more residual PtO x Cl y complex on the surface of the support.…”

Section: Resultsmentioning

confidence: 99%

“…Our previous work found a slight decrease in the Pt dispersion following aromatics oxidation at high temperatures (>300 °C) on Pt/BN. 3,4 However, the weak bonding strength between the BN support and Pt particles on Pt/BN is believed to be sufficient to fix Pt particles on the surface, particularly at low-temperature methanol oxidations. Kinetic Analysis.…”

Section: Resultsmentioning

confidence: 99%

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Deep Oxidation of Methanol Using a Novel Pt/Boron Nitride Catalyst

Fan

Lin

2003

Ind. Eng. Chem. Res.

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Deep oxidation of methanol was conducted using a novel Pt/BN catalyst in a steady-state-flow reactor. Hexagonal boron nitride (BN) is a graphitelike material in powder form with a specific surface area of 49 m 2 /g. A catalyst with 0.37 wt % Pt was prepared by the incipient wetness method using H 2 PtCl 6 as a precursor dissolved in methanol. The reaction temperature ranged from -10 to 200 °C. The concentration of methanol varied from 1000 to 4000 ppmv, while the oxygen varied from 5 to 80% and was balanced with nitrogen. The volume hourly space velocity was approximately 50 000 h -1 . Experimental results showed that a 50% methanol conversion could be achieved at room temperature (20 °C), reaching 95% conversion at 75 °C, while Pt/ Al 2 O 3 , Dash 220 (a commercial Pt/alumina catalyst), and PtPd/CeO 2 /Al 2 O 3 catalysts required considerably higher temperatures under the same conditions. The high oxidation activity of Pt/ BN was attributed to the weak Pt-O bonding of the Pt clusters on the BN surface, which led to high oxidizing reactivity. Regression analysis revealed that the reaction order of methanol was 1, while that of oxygen was -0.6. A mechanism of the Langmuir-Hinshelwood model was established based on the experimental results. Kinetic analysis suggested that the methanol adsorption on Pt would be the rate-limiting step on the Pt/BN catalyst.

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“…Moreover, the strong interaction between the metal and support can modulate the electronic structure of metal catalyst and further improve the catalytic performance. As a catalytic support, BN nanosheet, a structural analog of grapheme, featured with a local polarity B-N bond, has attracted considerable attention due to its excellent acid-base resistance, extraordinary oxidation resistance, and thermal stability (Lin, 2002; Pakdel et al, 2014; Sun et al, 2016; Tran-Thuy et al, 2017). Uosaki et al demonstrated the possibility to functionalize inert Au substrate to become ORR catalysts by BN modified, reducing the overpotential by ca.…”

Section: Introductionmentioning

confidence: 99%

Isolated Au Atom Anchored on Porous Boron Nitride as a Promising Electrocatalyst for Oxygen Reduction Reaction (ORR): A DFT Study

Zhang

et al. 2019

Front. Chem.

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The development of efficient, stable, and low-cost catalytic material for the oxygen reduction reaction (ORR) is currently highly desirable but challenging. In this work, based on first-principles calculation, the stabilities, catalytic activities and catalytic mechanisms of isolated Au atom supported on defective porous BN (p-BN) have been studied in detail. The results reveal that the defective p-BN anchor Au atom strongly to ensure the stability of Au/p-BN. Based on frontier molecular orbital and charge-density analysis, isolated Au atom supported on porous BN with VN defect (Au/p-BN-VN) is an effective ORR catalyst. Especially, the low barriers of the formation (0.38 eV) and dissociation (0.31 eV) of *OOH and the instability of H2O2 on Au/p-BN-VN catalyst suggest that ORR proceeds via 4-electron pathway. Along the favorable pathway, the reduction of O2 to *OOH is the rate-limiting step with the largest activation barrier of 0.38 eV and the maximum free energy change is 1.88 eV. Our results provide a useful guidance for the design and fabrication of new Au-base catalyst with high-efficiency and are beneficial for the developing of novel isolated metal atom catalysts for ORR.

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Characterization of Boron-Nitride-Supported Pt Catalysts for the Deep Oxidation of Benzene

Cited by 74 publications

References 19 publications

α-d-Glucopyranose Adsorption on a Pd30 Cluster Supported on Boron Nitride Nanotube

α-d-Glucopyranose Adsorption on a Pd30 Cluster Supported on Boron Nitride Nanotube

Deep Oxidation of Methanol Using a Novel Pt/Boron Nitride Catalyst

Isolated Au Atom Anchored on Porous Boron Nitride as a Promising Electrocatalyst for Oxygen Reduction Reaction (ORR): A DFT Study

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