HDN of indole over Ir-modified Ti-SBA-15

Ledesma, Brenda C.; Anunziata, Oscar A.; Beltramone, Andrea R.

doi:10.1016/j.apcatb.2016.03.066

Cited by 36 publications

(26 citation statements)

References 92 publications

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“…50 PdMS has an additional reduction event at 215 °C (Figure 3a), corresponding to Pd species, which have a strong interaction with the SBA-15 support. 51,52 This infers that PdMS has a distribution of Pd sites both inside and outside the SBA-15 framework. The hydrogen uptake was 0.15 and 0.10 mmol/g for PdMS and Pd/SBA-15, respectively.…”

Section: Resultsmentioning

confidence: 85%

Palladium Intercalated into the Walls of Mesoporous Silica as Robust and Regenerable Catalysts for Hydrodeoxygenation of Phenolic Compounds

et al. 2018

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Nanostructured noble-metal catalysts traditionally suffer from sintering under high operating temperatures, leading to durability issues and process limitations. The encapsulation of nanostructured catalysts to prevent loss of activity through thermal sintering, while maintaining accessibility of active sites, remains a great challenge in the catalysis community. Here, we report a robust and regenerable palladium-based catalyst, wherein palladium particles are intercalated into the three-dimensional framework of SBA-15-type mesoporous silica. The encapsulated Pd active sites remain catalytically active as demonstrated in high-temperature/pressure phenol hydrodeoxygenation reactions. The confinement of Pd particles in the walls of SBA-15 prevents particle sintering at high temperatures. Moreover, a partially deactivated catalyst containing intercalated particles is regenerated almost completely even after several reaction cycles. In contrast, Pd particles, which are not encapsulated within the SBA-15 framework, sinter and do not recover prior activity after a regeneration procedure.

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Section: Resultsmentioning

confidence: 85%

Palladium Intercalated into the Walls of Mesoporous Silica as Robust and Regenerable Catalysts for Hydrodeoxygenation of Phenolic Compounds

et al. 2018

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“…Various mesoporous Ti-SBA15 catalysts have been synthesized by post-synthesis, 25 sol-gel method, 26 hydrothermal process, 27,28 impregnation, 29,30 graing method, 31 and gas deposition. 32 These studies concluded that Ti-SBA15 synthesized with a well ratio of Si/Ti was advantageous for high photocatalytic activity such as high S BET (179-898 m 2 g À1 ) and pore volume (0.34-1.45 cm 3 g…”

Section: 23-25mentioning

confidence: 99%

“…The band at 527.9 eV corresponded to the lattice oxygen of the Ti-O-Ti bond. 25,28,43,51 As the Ti/Si ratio increased, the intensity of the Ti-O-Ti bond became stronger for TR (50). The O1s peak at 530.1 eV was deconvoluted into three peaks.…”

mentioning

confidence: 99%

Study of the structure and characteristics of mesoporous TiO₂ photocatalyst, and evaluation of its factors on gaseous formaldehyde removal by the analysis of ANOVA and S/N ratio

Lee

2018

RSC Adv.

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a This study differs from previous studies of TiO 2 /SiO 2 in that 0.5-10 mm microsized TiO 2 -rutile based catalysts (TR catalysts) with varying proportions of titanium and silicon were synthesized using a onestep modified hydrothermal method. At Ti/Si ¼ 1/9, a two-dimensional channel-structured catalyst with a morphology resembling that of SBA-15 was obtained. In contrast, at Ti/Si ¼ 3/7 or 5/5, a threedimensional porous structure was formed, and Ti-O-Si-C bonds appeared. The structure of the TR catalyst transformed due to the decrease in C-Si bond content and the increase in C-C bond content with increasing Ti/Si ratio. The results indicated that the rutile phase was the main crystal phase of the TR catalyst. The small crystal size and large rutile phase content of the mesoporous TR catalyst contributed to the low band gap energy below 3.0 eV. Under 2 Â 10 W lamp irradiation with either UVA or visible light, the three TR catalysts showed better formaldehyde (HCHO) removal efficiency than P25. Overall, the Pt/TR catalyst is a potential material for pollutant removal and can be easily separated from the pollutant removal system since the catalysts are microsized.

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“…In this arch for highly active and selective hydrotreatment catalysts for the oil industry, there are numerous works based on catalysts mainly with noble metals as active sites, since although they have a higher cost, the high conversions achieved justify their promising uses. Likewise, our previous works have shown that the acid support, the formation of bimetallic alloys, and the introduction of heteroatoms can greatly improve the performance of deposited metals in the active phase [10,11,12,13,14,15,16,17]. In this way of looking for more efficient catalysts, the supports with large surface areas have been greatly studied since they can achieve a great dispersion of the active phase, significantly improving the yield of the reactions.…”

Section: Introductionmentioning

confidence: 99%

“…In this sense, the support materials have been the protagonists of various studies. Among the most studied are metal oxides, such as Al 2 O 3 [4,5,6,7,8,9], and materials with different degrees of porosity, such as MCM (Mobil Composition of Matter), SBA, Santa Barbara Amorphous type material and zeolites [10,11,12,13,14,15,16,17,18].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Fe3O4@SiO2–Pt and Fe3O4@SiO2–Pt@SiO2 Structures for HDN of Indole

et al. 2019

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The effect of a second porous SiO2 shell in the activity and selectivity of the Fe3O4@SiO2–Pt catalyst in the hydrodenitrogenation of indole is reported. The double Fe3O4@SiO2–Pt@SiO2 structure was prepared by coating Fe3O4 nanoparticles with tetraethyl orthosilicate (TEOS) with a further impregnation of 1.0 wt.% of Pt on the (3-aminopropyl)triethoxysilane functionalized Fe3O4@SiO2 structures. The second porous SiO2 shell, obtained by using a hexadecyltrimethylammonium bromide (CTAB) template, covered the Fe3O4@SiO2–Pt catalyst with a well-defined and narrow pore-sized distribution. The full characterization by TEM, inductively coupled plasma-optical emission spectroscopy (ICP-OES), XRD, and N2 adsorption isotherm at 77 K and vibrating sample magnetometry (VSM) of the catalysts indicates homogeneous core@shell structures with a controlled nano-size of metallic Pt. A significant effect of the double SiO2 shell in the catalytic performance was demonstrated by both a higher activity to eliminate the nitrogen atom of the indole molecule present in model liquid fuel and the improvement of the catalytic stability reaching four consecutive reaction cycles with only a slight conversion level decrease.

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HDN of indole over Ir-modified Ti-SBA-15

Cited by 36 publications

References 92 publications

Palladium Intercalated into the Walls of Mesoporous Silica as Robust and Regenerable Catalysts for Hydrodeoxygenation of Phenolic Compounds

Palladium Intercalated into the Walls of Mesoporous Silica as Robust and Regenerable Catalysts for Hydrodeoxygenation of Phenolic Compounds

Study of the structure and characteristics of mesoporous TiO₂ photocatalyst, and evaluation of its factors on gaseous formaldehyde removal by the analysis of ANOVA and S/N ratio

Magnetic Fe3O4@SiO2–Pt and Fe3O4@SiO2–Pt@SiO2 Structures for HDN of Indole

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HDN of indole over Ir-modified Ti-SBA-15

Cited by 36 publications

References 92 publications

Palladium Intercalated into the Walls of Mesoporous Silica as Robust and Regenerable Catalysts for Hydrodeoxygenation of Phenolic Compounds

Palladium Intercalated into the Walls of Mesoporous Silica as Robust and Regenerable Catalysts for Hydrodeoxygenation of Phenolic Compounds

Study of the structure and characteristics of mesoporous TiO2 photocatalyst, and evaluation of its factors on gaseous formaldehyde removal by the analysis of ANOVA and S/N ratio

Magnetic Fe3O4@SiO2–Pt and Fe3O4@SiO2–Pt@SiO2 Structures for HDN of Indole

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Study of the structure and characteristics of mesoporous TiO₂ photocatalyst, and evaluation of its factors on gaseous formaldehyde removal by the analysis of ANOVA and S/N ratio