Ultrasound-assisted preparation of titania–alumina support with high surface area and large pore diameter by modified precipitation method

Wang, Weiyang; Yang, Yong; Luo, He’an; Hu, Tao; Wang, Rui; Liu, Wenying

doi:10.1016/j.jallcom.2010.12.119

Cited by 24 publications

(11 citation statements)

References 45 publications

(43 reference statements)

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“…This has led numerous researchers to look for a favorable compromise between alumina, with a high surface area, and titania, with enhanced catalytic proprieties, during the design of mixed‐oxide titania–alumina supports . The ideal titania–alumina support is expected to have a high specific surface area provided by the alumina and enhanced metal–support interactions and catalytic activity provided by the continuous layer of titania that covers the alumina …”

Section: Masses Of Titanyl Sulfate and Aluminum Sulfate Used For The mentioning

confidence: 99%

3 D Chemical Distribution of Titania–Alumina Catalyst Supports Prepared by the Swing‐pH Method

et al. 2016

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Analytical electron tomography combined with more classical techniques such as X‐ray fluorescence and X‐ray photoelectron spectroscopy were performed with a series of titania–alumina catalyst supports prepared by using the swing‐pH method. The bulk proportion of titania and alumina was varied along the sample series. It was observed that, independently of this bulk proportion, only 30 % of the surface of the grains of the resulting catalysts was titania covered. It was also shown that the porosity of the material was driven by alumina, and for low titania contents, alumina formed a layer close the surface of the grains. At concentrations higher than 30 % titania, the layer was broken and aggregates covered by alumina were formed, which may have an impact on catalysis if these materials are used as supports for an active phase.

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Section: Masses Of Titanyl Sulfate and Aluminum Sulfate Used For The mentioning

confidence: 99%

3 D Chemical Distribution of Titania–Alumina Catalyst Supports Prepared by the Swing‐pH Method

et al. 2016

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“…TiO 2 -based materials are among the most effective photocatalysts operating under ambient conditions for air purification applications [15,22,25,26,29]. However, TiO 2 is also known to have some drawbacks, such as poor mechanical properties and low specific surface area (SSA), which limit its catalytic performance [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Influence of the sol–gel preparation method on the photocatalytic NO oxidation performance of TiO2/Al2O3 binary oxides

et al. 2015

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In the current work, TiO 2 /Al 2 O 3 binary oxide photocatalysts were synthesized via two different sol-gel protocols (P1 and P2), where various TiO 2 to Al 2 O 3 mole ratios (0.5 and 1.0) and calcination temperatures (150-1000 • C) were utilized in the synthesis. Structural characterization of the synthesized binary oxide photocatalysts was also performed via BET surface area analysis, X-ray diffraction (XRD) and Raman spectroscopy. The photocatalytic NO(g) oxidation performances of these binary oxides were measured under UVA irradiation in a comparative fashion to that of a Degussa P25 industrial benchmark. TiO 2 /Al 2 O 3 binary oxide photocatalysts demonstrate a novel approach which is essentially a fusion of NSR (NO x storage reduction) and PCO (photocatalytic oxidation) technologies. In this approach, rather than attempting to perform complete NO x reduction, NO(g) is oxidized on a photocatalyst surface and stored in the solid state. Current results suggest that alumina domains can be utilized as active NO x capturing sites that can significantly eliminate the release of toxic NO 2 (g) into the atmosphere. Using either (P1) or (P2) protocols, structurally different binary oxide systems can be synthesized enabling much superior photocatalytic total NO x removal (i.e. up to 176% higher) than Degussa P25. Furthermore, such binary oxides can also simultaneously decrease the toxic NO 2 (g) emission to the atmosphere by 75% with respect to that of Degussa P25. There is a complex interplay between calcination temperature, crystal structure, composition and specific surface area, which dictate the ultimate photocatalytic activity in a coordinative manner. Two structurally different photocatalysts prepared via different preparation protocols reveal comparably high photocatalytic activities implying that the active sites responsible for the photocatalytic NO(g) oxidation and storage have a non-trivial nature.

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“…Normal alumina has a relatively large specific surface area (about 200 m 2 /g), but still cannot meet the demand of the chemical and petrochemical industries. A catalyst with a small pore diameter or low specific surface area would decrease its catalytic activity by restricting the access of reactants to the catalytic sites or decreasing the numbers of activity sites per unit area 5 . Appropriate amount of macropores can promote the desorption of the products, following by the inhibition of some side reactions 6 .…”

mentioning

confidence: 99%

Hydroprocessing of Jatropha Oil for Production of Green Diesel over Non-sulfided Ni-PTA/Al2O3 Catalyst

Liu

Lei

et al. 2015

Sci Rep

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The non-sulfided Ni-PTA/Al2O3 catalyst was developed to produce green diesel from the hydroprocessing of Jatropha oil. The Ni-PTA/Al2O3 catalyst was prepared by one-pot synthesis of Ni/Al2O3 with the co-precipitation method and then impregnanting Ni/Al2O3 with PTA solution. The catalysts were characterized with BET, SEM-EDX, TEM, XRD, XPS, TGA and NH3-TPD. The Ni and W species of the Ni-PTA/Al2O3 catalyst were much more homogeneously distributed on the surface than that of commercial Al2O3. Catalytic performance in the hydroprocessing of Jatropha oil was evaluated by GC. The maximum conversion of Jatropha oil (98.5 wt%) and selectivity of the C15-C18 alkanes fraction (84.5 wt %) occurred at 360 °C, 3.0 MPa, 0.8 h−1. The non-sulfided Ni-PTA/Al2O3 catalyst is more environmentally friendly than the conventional sulfided hydroprocessing catalyst, and it exhibited the highest catalytic activity than the Ni-PTA catalyst supported with commercial Al2O3 grain and Al2O3 powder.

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Ultrasound-assisted preparation of titania–alumina support with high surface area and large pore diameter by modified precipitation method

Cited by 24 publications

References 45 publications

3 D Chemical Distribution of Titania–Alumina Catalyst Supports Prepared by the Swing‐pH Method

3 D Chemical Distribution of Titania–Alumina Catalyst Supports Prepared by the Swing‐pH Method

Influence of the sol–gel preparation method on the photocatalytic NO oxidation performance of TiO2/Al2O3 binary oxides

Hydroprocessing of Jatropha Oil for Production of Green Diesel over Non-sulfided Ni-PTA/Al2O3 Catalyst

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