Isomerization of n-hexane over Pt‐H3PW12O40/SBA-15 bifunctional catalysts: Effect of the preparation method on catalytic performance

Pinto, Teresa; Arquillière, Philippe; Dufaud, Véronique; Lefèbvre, Frédéric

doi:10.1016/j.apcata.2016.09.013

Cited by 22 publications

(8 citation statements)

References 40 publications

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“…After impregnating with HPW, the characteristics peaks for HPW (2 ¼ 10:6 , 25.4 and 34.1 ) were observed, indicating that the HPW was well preserved with the support. 13,31 The peaks at 2 ¼ 43:5 and 44.1 almost overlapped together.…”

Section: -5mentioning

confidence: 93%

A Clean Hydroprocessing of Jatropha Oil into Biofuels over a High Performance Ni-HPW/CNT Catalyst

Yang

Liu

et al. 2017

NANO

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The nickel (Ni) and phosphotungstic acid (HPW) supported on carbon nanotubes (CNT) were prepared by impregnation method for hydroprocessing of Jatropha oil. The Ni-HPW/CNT catalyst was characterized by XRD, XPS, FT-IR, N2 adsorption-desorption, SEM, NH3-TPD, and TGA. The effects of reaction parameters, such as reaction temperature (280–400[Formula: see text]C), time-on-stream (0–100[Formula: see text]h), types of support, the amount of added HPW, and coking deposition were investigated. The cracking performance was evaluated by gas chromatography (GC). The yield of C15–C18 alkanes was 88.5[Formula: see text]wt.%, Iso/n ratio was 0.8 and conversion was 97.7% at 320[Formula: see text]C, 3.0[Formula: see text]MPa and 1.0/h over the Ni-HPW/CNT catalyst, while the yield of [Formula: see text] alkanes reached 51.9[Formula: see text]wt.% at 400[Formula: see text]C. The distribution of products could be adjusted by reaction temperature. The cracking performance was elevated by the addition of HPW and the electrical conductivity. The C15–C18 alkanes were further cracked through two cracking circulations. Meanwhile, the catalyst was used without sulfurization and the cracking process was green.

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Section: -5mentioning

confidence: 93%

A Clean Hydroprocessing of Jatropha Oil into Biofuels over a High Performance Ni-HPW/CNT Catalyst

Yang

Liu

et al. 2017

NANO

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“…The light absorption behaviors of the as-synthesized samples were evaluated through UV-VIS absorption spectra. As observed in Figure 4 , the absorption edge of the pure PW 9 is located around 350 nm, corresponding to the forbidden gap of ~3.5 eV between HOMO and LUMO of the PW 9 [ 15 , 33 ]. Meanwhile, the absorption edge of pure g-C 3 N 4 NSs appears at ~480 nm, suggesting the ~2.6 eV of the bandgap of the g-C 3 N 4 NSs [ 34 ].…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Lacunary Keggin-Type Phosphotungstates-Decorated g-C3N4 Nanosheets for Enhancing Photocatalytic H2 Generation

et al. 2020

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In this work, the lacunary Keggin-type phosphotungstates of [PW9O34]9- (PW9) clusters were loaded onto the g-C3N4 nanosheets (NSs) to synthesize the phosphotungstate clusters-decorated 2D heterojunction photocatalysts by using the electrostatic-force driven self-assembly process. The surface charge polarity of g-C3N4 NSs was changed from a negative to a positive charge through the acidizing treatment. The positively-charged g-C3N4 NSs allowed the negatively-charged PW9 clusters to be adsorbed and deposited onto the g-C3N4 NSs, forming the PW9/g-C3N4 heterojunction NSs. The as-synthesized samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, and UV-VIS absorption spectra, respectively. The photocatalytic activity tests indicated that, upon simulated sunlight irradiation, the photocatalytic H2-generation rate of PW9/g-C3N4 heterojunction NSs (~23.8 μmol h−1) was ~3.3 times higher than that of the pure g-C3N4 NSs (~7.3 μmol h−1). The enhanced photocatalytic activity of PW9 cluster-decorated g-C3N4 NSs could be attributed to the enhanced separation process of the photoinduced charge-carriers, due to the Z-scheme-mediate charge transfer behavior across their hetero-interface.

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“…The most commonly used supports are various forms of SiO 2 , attributed to the tunable pore structure and abundant surface hydroxyl groups. Among which, ordered mesoporous silica materials, such as MCM-41 and SBA-15, have been used as the supports of HPAs catalysts in oxidative desulfurization, [2][3][4] selective oxidation, [5][6][7] esterification, [8][9][10] dehydration of glycerol to acrolein, 11,12 ethanol dehydration, 13,14 acylation, 15 hydroxylation, 16,17 and isomerization, 18,19 and so on. Mesocellular foam silica, as a modified form of SBA-15 with three-dimensional pore structure and larger pore diameter, has been used as a support for Cs 2.5 H 0.5 PW 12 O 40 , and the obtained catalyst showed good performances in benzylation of phenol 20 and hydroxyalkylation of anisole with benzaldehyde.…”

Section: Introductionmentioning

confidence: 99%

Comparison in thermal stability and catalytic performance of H₄PMo₁₁VO₄₀ heteropolyacid supported on mesoporous and macroporous silica materials

Zhang

Yang

Zhao

et al. 2020

Journal of Chemical Research

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Ordered mesoporous silica, SBA-15 and MCM-41, and three-dimensionally ordered macroporous SiO2 were used as the supports of H4PMo11VO40 heteropolyacid for methacrolein oxidation. The dispersion and structural evolutions of the heteropolyacid along with thermal treatment were investigated. It was found that the heteropolyacid entered the one-dimensional mesoporous channels of SBA-15 and MCM-41, and the crystallization and growth were limited, leading to high dispersion of the heteropolyacid. However, the thermal stability was decreased under high dispersion. The migration of the heteropolyacid was observed to the end of the one-dimensional channels of SBA-15 and the outer surface of MCM-41 with calcination, accompanied by the decomposition of the heteropolyacid and the formation of MoO3. In comparison, the crystallization and growth of heteropolyacid were not limited in the open macropores of three-dimensionally ordered macroporous SiO2. Dispersed particles on the surface of the macropores with size of about 5 nm exhibited a higher thermal stability. The decomposition of the heteropolyacid in the SBA-15 and MCM-41 supported catalysts resulted in the loss of strong acid sites, causing low selectivity to methacrylic acid in methacrolein oxidation. High thermal stability with high exposure of the active sites in the three-dimensionally ordered macroporous SiO2 supported catalyst contributed to the enhancement in the catalytic performance.

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Isomerization of n-hexane over Pt‐H3PW12O40/SBA-15 bifunctional catalysts: Effect of the preparation method on catalytic performance

Cited by 22 publications

References 40 publications

A Clean Hydroprocessing of Jatropha Oil into Biofuels over a High Performance Ni-HPW/CNT Catalyst

A Clean Hydroprocessing of Jatropha Oil into Biofuels over a High Performance Ni-HPW/CNT Catalyst

Facile Synthesis of Lacunary Keggin-Type Phosphotungstates-Decorated g-C3N4 Nanosheets for Enhancing Photocatalytic H2 Generation

Comparison in thermal stability and catalytic performance of H₄PMo₁₁VO₄₀ heteropolyacid supported on mesoporous and macroporous silica materials

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Isomerization of n-hexane over Pt‐H3PW12O40/SBA-15 bifunctional catalysts: Effect of the preparation method on catalytic performance

Cited by 22 publications

References 40 publications

A Clean Hydroprocessing of Jatropha Oil into Biofuels over a High Performance Ni-HPW/CNT Catalyst

A Clean Hydroprocessing of Jatropha Oil into Biofuels over a High Performance Ni-HPW/CNT Catalyst

Facile Synthesis of Lacunary Keggin-Type Phosphotungstates-Decorated g-C3N4 Nanosheets for Enhancing Photocatalytic H2 Generation

Comparison in thermal stability and catalytic performance of H4PMo11VO40 heteropolyacid supported on mesoporous and macroporous silica materials

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Product

Resources

About

Comparison in thermal stability and catalytic performance of H₄PMo₁₁VO₄₀ heteropolyacid supported on mesoporous and macroporous silica materials