High-resolution electron microscopic, spectroscopic, and catalytic studies of intentionally sulfided Pt/ZrO2–SO4 catalysts

Appay, Marie–Dominique; Manoli, Jean‐Marie; Potvin, Claude; Wild, Ute; Pozdnyakova, Olga; Paál, Z.

doi:10.1016/j.jcat.2003.11.014

Cited by 26 publications

(5 citation statements)

References 61 publications

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“…The XPS spectra of the S 3p bands of the sulfated MNO samples (Figure a) suggest the presence of sulfur. The peak at 169.3 eV and the weak shoulder peak at 170.4 eV are ascribed to the 2p 3/2 and 2p 1/2 binding energies, respectively, of S 6+ , − indicating the successful introduction of sulfonic groups or sulfates onto the surface of MNO. As expected, there was no peak in the XPS spectrum of the S 3p region for commercial Nb 2 O 5 .…”

Section: Resultsmentioning

confidence: 99%

Sulfated Mesoporous Niobium Oxide Catalyzed 5-Hydroxymethylfurfural Formation from Sugars

Ngee

Gao

Chen

et al. 2014

Ind. Eng. Chem. Res.

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The effectiveness of sulfated mesoporous niobium oxide (MNO-S) as a catalyst for the production of 5hydroxymethylfurfural (5-HMF) from sugar was studied and is reported herein. The structures of the synthesized MNO-S catalysts and commercial Nb 2 O 5 were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Brunauer−Emmett−Teller (BET) analysis, and Fourier transform infrared (FTIR) spectroscopy. Compared with commercial Nb 2 O 5 , the MNO-S-based catalysts showed a much higher surface area and acidity. MNO-S calcined at 300 °C was found to be the most effective catalyst in fructose dehydration into 5-HMF in DMSO, with a yield as high as 88% and excellent recyclability. Furthermore, the Bronsted acid sites on the surface of the catalyst enable hydrolysis and dehydration reactions to occur in a one-pot manner. As such, MNO-S effectively transforms a wide range of sugar substrates, such as sucrose, cellobiose, and even the polysaccharide inulin, into 5-HMF with reasonable yields.

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Section: Resultsmentioning

confidence: 99%

Sulfated Mesoporous Niobium Oxide Catalyzed 5-Hydroxymethylfurfural Formation from Sugars

Ngee

Gao

Chen

et al. 2014

Ind. Eng. Chem. Res.

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“…FT-IR characterization revealed that when H 2 (D 2 ) was introduced to the Ru/ZrO 2 catalyst, H 2 (D 2 ) dissociatively adsorbed on the Ru surface and spilled from Ru particles onto the ZrO 2 support to form the H 2 O (D 2 O)-like species, which desorbs as H 2 (D 2 ) but not as H 2 O (D 2 O). Besides, Appay et al found that on the acid sites of the Pt/ZrO 2 −SO 4 catalyst, the hydrogenation of cyclohexene was always faster than that of benzene at various reaction temperatures, 51 indicating the more facile hydrogenation of cyclohexene than benzene on acid sites.…”

Section: Taking Into Account Of the Results Presented In Table 2 Andmentioning

confidence: 99%

Effect of Support Acidity on Liquid-Phase Hydrogenation of Benzene to Cyclohexene over Ru–B/ZrO₂Catalysts

Zhou¹,

Liu²,

Tan³

et al. 2012

Ind. Eng. Chem. Res.

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Ru−B/ZrO 2 catalysts using monoclinic, amorphous, and tetragonal ZrO 2 as supports were prepared and used for liquid-phase hydrogenation of benzene to cyclohexene. It is identified that both the Lewis acid sites and the Brønsted acid sites existed on monoclinic ZrO 2 (ZrO 2 -M), while there were only Lewis acid sites on amorphous (ZrO 2 -A) and tetragonal ZrO 2 (ZrO 2 -T). The amount of acid sites on ZrO 2 -T was the lowest. In liquid-phase hydrogenation of benzene to cyclohexene, the Ru−B/ZrO 2 -T catalyst exhibited the highest selectivity and yield of cyclohexene, with the maximum yield of cyclohexene being 47%. These results suggest that for ZrO 2 -supported Ru−B catalysts, the lower was the amount of acid sites on ZrO 2 , the higher was the selectivity to cyclohexene. Also, the presence of the Brønsted acid sites on ZrO 2 is probably adverse to the selectivity toward cyclohexene.

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“…To further determine the valence state of the elements in the Al 2 O 3 /SO 4 2− /ZrO 2 catalyst, the catalyst was characterized by XPS, as shown in Figure 5. The spectrum indicated the presence of Zr, Al, C, and S. According to Figure 5 and related literature, the S 2p region of the Al 2 O 3 /SO 4 2− /ZrO 2 catalyst had only one peak at 169 eV [25,26], which belongs to a positive hexavalent sulfate species, indicating that only the highest valence sulfate was present in the catalyst. We now know that the Al 2 O 3 component in superacid catalysts affects the crystal structure, specific surface properties, and surface sulfur species, and that these properties will inevitably cause changes in the acidic properties and catalytic activity of the catalyst.…”

Section: Catalytic Activity Of Almentioning

confidence: 63%

Synthesis of Brominated Alkanes via Heterogeneous Catalytic Distillation over Al2O3/SO42−/ZrO2

et al. 2021

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Concentrated sulfuric acid is generally used as a catalyst for producing brominated alkanes in traditional methods, but is highly corrosive and difficult to separate. This work reports the preparation of bromopropane from n-propanol based on a reactive distillation strategy combined with alumina-modified sulfated zirconia (Al2O3/SO42−/ZrO2) as a heterogenous catalyst. As expected, under the optimum reaction conditions (110 °C), the yield of bromopropane was 96.18% without side reactions due to the reactive distillation strategy. Meanwhile, the microscopic morphology and performance of Al2O3/SO42−/ZrO2 were evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Brunner–Emmet–Teller (BET), Fourier transform infrared spectroscopy (FT–IR), and other characterization methods. The results confirmed that the morphology of zirconia sulfate is effectively regulated by the modification method of alumina, and more edges and angles provide more catalytic acid sites for the reaction. Furthermore, Al2O3/SO42−/ZrO2 exhibited high stability and remarkable reusability due to the strong chemical bond Zr–Al–Zr. This work provides a practical method for the preparation of bromopropane and can be further extended to the preparation of other bromoalkanes.

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High-resolution electron microscopic, spectroscopic, and catalytic studies of intentionally sulfided Pt/ZrO2–SO4 catalysts

Cited by 26 publications

References 61 publications

Sulfated Mesoporous Niobium Oxide Catalyzed 5-Hydroxymethylfurfural Formation from Sugars

Sulfated Mesoporous Niobium Oxide Catalyzed 5-Hydroxymethylfurfural Formation from Sugars

Effect of Support Acidity on Liquid-Phase Hydrogenation of Benzene to Cyclohexene over Ru–B/ZrO₂Catalysts

Synthesis of Brominated Alkanes via Heterogeneous Catalytic Distillation over Al2O3/SO42−/ZrO2

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High-resolution electron microscopic, spectroscopic, and catalytic studies of intentionally sulfided Pt/ZrO2–SO4 catalysts

Cited by 26 publications

References 61 publications

Sulfated Mesoporous Niobium Oxide Catalyzed 5-Hydroxymethylfurfural Formation from Sugars

Sulfated Mesoporous Niobium Oxide Catalyzed 5-Hydroxymethylfurfural Formation from Sugars

Effect of Support Acidity on Liquid-Phase Hydrogenation of Benzene to Cyclohexene over Ru–B/ZrO2Catalysts

Synthesis of Brominated Alkanes via Heterogeneous Catalytic Distillation over Al2O3/SO42−/ZrO2

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Effect of Support Acidity on Liquid-Phase Hydrogenation of Benzene to Cyclohexene over Ru–B/ZrO₂Catalysts