Gold nanoparticles supported on mesostructured oxides for the enhanced catalytic reduction of 4-nitrophenol in water

Shanmugaraj, Krishnamoorthy; Bustamante, Tatiana M.; Torres, Cecilia C.; Campos, Cristian H.

doi:10.1016/j.cattod.2020.05.051

Cited by 27 publications

(15 citation statements)

References 81 publications

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“…In PdHout, the Pd NPs were mainly distributed on the outer surface of the support with a particle size of 1.6 ± 0.1 nm (Figure b). According to the ATR-FTIR characterization, we suggest that the selective external chemical modification of the support provide the formation [PdCl 4– x (NH 2 –H-APTMS) x ] x −2 species, which assisted the Pd NP deposition as well as their homogeneous distribution on the external surface of the carrier . This trend is in line with our previous reported results for the APTMS-assisted deposition of noble metals in nanotubular supports .…”

Section: Resultssupporting

confidence: 90%

“…HNT was modified with (3-aminopropyl)trimethoxysilane (APTMS) using a previously reported protocol . An appropriate volume of K 2 PdCl 4 (9.6 mmol L –1 ) was added into the amine-functionalized halloysite nanotubes and stirred for 4 h. Then, 10 mL of a freshly prepared NaBH 4 solution (50 mmol L –1 ) was added, and the mixture was stirred for 1 h. Finally, the solid was collected, thoroughly washed with water, and then dried at 323 K for 12 h. This catalyst was named PdHout (0.5 wt % Pd supported on the outer surface of halloysite nanotubes).…”

Section: Methodsmentioning

confidence: 99%

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Valorization of Waste Tires via Catalytic Fast Pyrolysis Using Palladium Supported on Natural Halloysite

Osorio-Vargas

Shanmugaraj

Herrera

et al. 2021

Ind. Eng. Chem. Res.

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We report for the first time Pd nanoparticles (NPs) supported on natural halloysite as catalysts for selective production of p-cymene from waste tire pyrolysis (WTP). The catalysts were prepared by dispersing Pd NPs on either the inner (PdHin, 3.4 nm) or outer surface (PdHout, 1.6 nm) of halloysite nanotubes to produce different acid–base properties. The performance of these catalysts for WTP was studied by micropyrolysis coupled to mass spectrometry (Py-GC/MS) between 400 and 500 °C and for discrete times (2, 12, 20, and 40 s). PdHin exhibited twice the selectivity (42%) of PdHout, which was attributed to its higher acidity (1.74 mequiv g–1) and its bifunctionality established between the support’s acidity and the Pd0 sites. From discrete time-dependent experiments, we estimated activation energies for waste tire conversion (72.8 kJ/mol) and p-cymene production on PdHin (101.0 kJ/mol) under a kinetically controlled regime (Biot ∼3.1, PyI ≫1, and PyII ≫1).

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Section: Resultssupporting

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Valorization of Waste Tires via Catalytic Fast Pyrolysis Using Palladium Supported on Natural Halloysite

Osorio-Vargas

Shanmugaraj

Herrera

et al. 2021

Ind. Eng. Chem. Res.

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“…These can be ascribed to their unique morphology and optimized electronic structure by synergy or alloy effects 17 – 22 . Au catalysts are widely employed in many fields, for example, CO oxidation, coupling reactions, oxidation of ethanol and degradation of 4-NP, because they are most active and selective under mild or even low-temperature conditions at the nanoscale 23 – 26 . Moreover, platinum-group metals (PGMs, such as Rh, Pd, Ir and Pt) have excellent chemical activity and thus exhibit advantageous performance 27 – 30 .…”

Section: Introductionmentioning

confidence: 99%

One-pot synthesis of Au-M@SiO2 (M = Rh, Pd, Ir, Pt) core–shell nanoparticles as highly efficient catalysts for the reduction of 4-nitrophenol

Hao

Liu

Maenosono

et al. 2022

Sci Rep

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The conversion of p-nitrophenol (4-NP) to p-aminophenol (4-AP) is of great significance for pharmaceutical and material manufacturing. In this work, Au-M@SiO2 (M = Rh, Pd, Ir, Pt) nanoparticles (NPs) with core–shell structures, which are expected to be excellent catalysts for the transformation of 4-NP to 4-AP, were synthesized by a facile one-pot one-step method. The structure and composition of the NPs were characterized through transmission electron microscopy, X-ray powder diffraction and X-ray photoelectron spectroscopy. Au-M@SiO2 (M = Rh, Pd, Ir, Pt) core–shell NPs showed excellent catalytic activity in the reduction of 4-NP, which is superior to most catalysts reported in the previous literature. The enhanced catalytic activity of Au-M@SiO2 core–shell NPs is presumably related to the bimetallic synergistic effect. This study provides a simple strategy to synthesize core–shell bimetallic NPs for catalytic applications.

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“…However, because the loading amount of metallic nickel of different catalysts was varied, the kinetic rate constant cannot fully evaluate the catalytic performance of the catalysts. Hence, the activity parameter K is introduced to compare and estimate the catalytic activity of different catalysts, defined as the ratio of k over the total mass of the nickel catalyst, where K = k / m . Based on the ICP data of 33.1 μg/mg for C-Ni/500 and 14.1 μg/mg for Fe 3 O 4 -Ni/C, the activity factor K was calculated to be 0.523 and 0.059 mg –1 s –1 for C-Ni/500 and Fe 3 O 4 -Ni/C, respectively (Table ).…”

Section: Catalytic Evaluationmentioning

confidence: 99%

Controllable Compositions and Structures of Fe_xO_y@SiO₂@C-Ni Hybrids with a Silica Layer as a Mineral Redox Buffer

Ding

Yang

et al. 2021

Inorg. Chem.

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Mineral redox buffer is a vital concept in geology that can be applied to modulate hybrid compositions and generate nanostructures with expected morphology. Here, via combining a dual coating of an inorganic silica and organic resorcinol-formaldehyde-Ni2+ (RF-Ni2+) layer on α-Fe2O3 spindles with a subsequent calcination process, core–shell Fe x O y @SiO2@C-Ni composites with multicompositional structures were fabricated as efficient catalysts for 4-nitrophenol (4-NP) reduction. Notably, the silica layer as a redox buffer between hematite cores and the RF-Ni2+ shell played a crucial role in modulating the compositions and structures of the Fe x O y @SiO2@C-Ni. Without the silica layer, Fe3O4-Ni/C composites with Ni nanoparticles trapped into the Fe3O4 cores were generated. Moreover, a significant impact of the calcination temperature on morphologies and compositions of the Fe x O y @SiO2@C-Ni catalysts along with their catalytic performances has been verified. As a result, the catalyst annealed at 500 °C exhibited a high magnetic property and optimized morphology with high-density small nickel nanoparticles (∼11.6 nm), showing remarkably enhanced catalytic activity compared to the Fe3O4-Ni/C composites and excellent recyclability with a high conservation of about 92%. Furthermore, this synthetic strategy shows significant potential to modulate the nanostructures and phases of other multivalent metal oxide nanocomposites.

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Gold nanoparticles supported on mesostructured oxides for the enhanced catalytic reduction of 4-nitrophenol in water

Cited by 27 publications

References 81 publications

Valorization of Waste Tires via Catalytic Fast Pyrolysis Using Palladium Supported on Natural Halloysite

Valorization of Waste Tires via Catalytic Fast Pyrolysis Using Palladium Supported on Natural Halloysite

One-pot synthesis of Au-M@SiO2 (M = Rh, Pd, Ir, Pt) core–shell nanoparticles as highly efficient catalysts for the reduction of 4-nitrophenol

Controllable Compositions and Structures of Fe_xO_y@SiO₂@C-Ni Hybrids with a Silica Layer as a Mineral Redox Buffer

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Gold nanoparticles supported on mesostructured oxides for the enhanced catalytic reduction of 4-nitrophenol in water

Cited by 27 publications

References 81 publications

Valorization of Waste Tires via Catalytic Fast Pyrolysis Using Palladium Supported on Natural Halloysite

Valorization of Waste Tires via Catalytic Fast Pyrolysis Using Palladium Supported on Natural Halloysite

One-pot synthesis of Au-M@SiO2 (M = Rh, Pd, Ir, Pt) core–shell nanoparticles as highly efficient catalysts for the reduction of 4-nitrophenol

Controllable Compositions and Structures of FexOy@SiO2@C-Ni Hybrids with a Silica Layer as a Mineral Redox Buffer

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Controllable Compositions and Structures of Fe_xO_y@SiO₂@C-Ni Hybrids with a Silica Layer as a Mineral Redox Buffer