Synthesis of mesoporous γ-Fe2O3 supported palladium nanoparticles and investigation of their roles as magnetically recyclable catalysts for nitrobenzene hydrogenation

Jiang, Ting; Du, Shoucheng; Jafari, Tahereh; Zhong, Wei; Sun, Yu; Song, Wenqiao; Luo, Zhu; Hines, W. A.; Suib, Steven L.

doi:10.1016/j.apcata.2015.05.013

Cited by 23 publications

(9 citation statements)

References 55 publications

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“…Material (catalyst) properties, such as surface area, pore structure and morphologies significantly influence the catalytic activity in heterogeneous catalytic systems. [40] Generally, higher surface area brings more active sites, leading to higher catalytic activity. The surface areas of all samples have been determined by the Brunauer-Emmett-Teller (BET) theory (Table S1).…”

Section: Materials Properties the Decisive Role Of Structurementioning

confidence: 99%

Structure–property relationships of copper modified mesoporous TiO2 materials on alkyne homocoupling reactions

Luo

Cetegen

Miao

et al. 2016

Journal of Catalysis

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Three different modification (doping, solvent free, and impregnation) methods were used to obtain a series of mesoporous Cu-TiO 2 materials with various copper loading amounts (0 to 15 mol %). The influence of the modification procedure on the physico-chemical properties was characterized by PXRD, N 2 sorption, SEM, EDX elemental mapping, and XPS techniques. The presence of copper species have been detected either in the TiO 2 lattice as Cu + (via doping methods) or on the surface of TiO 2 as CuO species (via solvent free and impregnation methods). With the modification of Cu, the surface area of mesoporous Cu-TiO 2 materials can be increased up to 128 m 2 /g. The catalytic activities of Cu-TiO 2 materials were investigated using the alkyne-alkyne homocoupling reaction with air as the sole oxidant under mild reaction conditions without any additives. The doped Cu-TiO 2 materials show the highest catalytic activity (1,4-diphenyl-1,3-butadiyne yields > 99%). The different catalytic mechanisms, active sites, and structure-property relationships of all the catalysts are discussed. Definitive features affecting the catalytic performance of the obtained Cu-TiO 2 materials are the loading amounts and the states of Cu, surface area, and pore size distributions. Reusability tests were conducted on the collected sample without washing, and 74% yield was achieved even after three cycles.

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Section: Materials Properties the Decisive Role Of Structurementioning

confidence: 99%

Structure–property relationships of copper modified mesoporous TiO2 materials on alkyne homocoupling reactions

Luo

Cetegen

Miao

et al. 2016

Journal of Catalysis

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“…[16,20] Mesoporous materials are considered as excellent catalysts for applications requiring high surface area and large amount of active sites, due to their tunable structural properties such as surface area, pore volume, size, and nanocrystallinity. [21,22] Mesoporous titanium dioxide that combines a photoactive framework and an open porous structure is of great interest. [23] Mesoporous TiO 2 applied in the photocatalysis area has been extensively reported.…”

Section: Introductionmentioning

confidence: 99%

Mesoporous TiO2 modified with carbon quantum dots as a high-performance visible light photocatalyst

Miao

Luo

Zhong

et al. 2016

Applied Catalysis B: Environmental

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We report a preparation method for visible light responsive Carbon Quantum Dots (CQDs) embedded in mesoporous TiO 2 materials. The as-prepared mesoporous TiO 2 (meso-Ti-450) material is a member of the recently designed University of Connecticut (UCT) mesoporous materials family. The UCT materials were synthesized based on sol-gel chemistry. The nanoparticles are randomly packed in inverse surfactant micelles and mesopores are formed by interconnected intraparticles. To achieve full usage of the visible region of sunlight (> 400 nm), CQDs were introduced without destroying the mesopores. The photocatalytic performance of the CQDs/meso-Ti-450 was investigated by the degradation of methylene blue. Due to the up-conversion property and electron withdrawing property of CQDs, the photocatalytic activity of the composite material was largely enhanced under visible light irradiation. The highest photocatalytic activity was achieved by 5% CQDs/meso-Ti-450 in an hour. Compared to commercial P25, which is capable of removing 10% methylene blue (MB) under visible light conditions, the 5% CQDs/meso-Ti-450 can mostly remove MB (98%) under the same conditions. To date, the usage of mesoporous titanium oxide and carbon material composites for dye degradation under visible light has not been reported.

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“…4 D , the pore‐size distributions of the C‐nanocasted HNTs verify that PVA molecular was fully nanocasted in the nanopore channel of HNTs by our method. In addition, it is also revealed that the as‐prepared CNRs possess two types of main mesopores at 3.9 and 9.5 nm, respectively, as calculated by the BJH method [26].…”

Section: Resultsmentioning

confidence: 99%

HNTs‐templated preparation of carbon nanorods by nanocasting method

Liu

Cheng

Liu

2017

Micro & Nano Letters

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Carbon nanorods (CNRs) have been attracting increasing interest because of their potential applications in high-performance nanoscale materials and electronic devices. Among the many preparation methods, the nanocasting method via inorganic template materials exhibited a controllable and facile feature. This work was to present a novel preparation of CNRs through the nanocasting method using halloysite nanotubes (HNTs) as the template and polyvinyl alcohol (PVA) as the nanocasting carbon source. For the sake of PVA nanocasted in the hollow structure of HNTs, we adopted the repeated soakage method. The forming process and structure of CNRs were revealed by XRD, FT-IR, SEM, TEM, SAED XPS, Raman and Brunner-Emmet-Teller (BET) characterisation techniques. The results showed that the as-obtained CNRs with the rod-like structure had a high specific surface area of ca. 284 m 2 /g and exhibited typical mesoporous features.

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Synthesis of mesoporous γ-Fe2O3 supported palladium nanoparticles and investigation of their roles as magnetically recyclable catalysts for nitrobenzene hydrogenation

Cited by 23 publications

References 55 publications

Structure–property relationships of copper modified mesoporous TiO2 materials on alkyne homocoupling reactions

Structure–property relationships of copper modified mesoporous TiO2 materials on alkyne homocoupling reactions

Mesoporous TiO2 modified with carbon quantum dots as a high-performance visible light photocatalyst

HNTs‐templated preparation of carbon nanorods by nanocasting method

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