Synthesis of Porous α-Fe<sub>2</sub>O<sub>3</sub> Nanorods and Deposition of Very Small Gold Particles in the Pores for Catalytic Oxidation of CO

Zhong, Ziyi; Ho, Judith; Teo, Jaclyn; Shen, and Shoucang; Gedanken, Aharon

doi:10.1021/cm071165a

Cited by 163 publications

(145 citation statements)

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“…We also made an effort to study the physicochemical properties of the catalysts and correlate the properties with catalytic CO oxidation activity. [21]. Typically, 1.0 g of Fe(NO 3 ) 3 ⋅9H 2 O was added to 10 mL of 0.1 N aqueous NH 4 H 2 PO 4 solution.…”

Section: Journal Of Nanomaterialsmentioning

confidence: 99%

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Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe₂O₃Catalysts

Alshehri

Narasimharao

2017

Journal of Nanomaterials

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Low temperature active and stable mesoporous Au (0.1, 0.2, 0.5, and 1.0 wt.%) supported -Fe 2 O 3 catalysts were prepared via deposition-precipitation method. The H 2 -pretreated catalyst with 0.5 wt.% Au loading offered CO conversion of 100% at 323 K and showed continual activity for at least 120 h. X-ray diffraction and transmission electron microscopy analysis indicate that Au species were highly dispersed as nanoparticles (20-40 nm) on the surface of -Fe 2 O 3 support even after thermal treatment at 773 K. The N 2 -physisorption measurements show that the synthesized -Fe 2 O 3 support and Au-Fe 2 O 3 nanocomposites possessed mesopores with high specific surface area of about 158 m 2 g −1 . X-ray photoelectron spectroscopy and H 2 -TPR results reveal that the Au species exist in metallic and partially oxidized state due to strong interaction with the support. Effective Au-Fe 2 O 3 interaction resulted in a high activity for Au nanoparticles, locally generated by the thermal treatment at 773 K in air.

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Section: Journal Of Nanomaterialsmentioning

confidence: 99%

“…A specific rate for CO oxidation for calcined 0.5Au-Fe catalyst was calculated and compared with reaction [21]. The enhanced activity of the catalyst could be attributed to the small size of the synthesized Au nanoparticles [48] and also the synthesized nanosized mesoporous Fe 2 O 3 support possessed a high surface area.…”

Section: Catalytic Oxidation Of Carbonmentioning

confidence: 99%

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe₂O₃Catalysts

Alshehri

Narasimharao

2017

Journal of Nanomaterials

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“…Zhong et al [41] also used porous Fe 2 O 3 as support but prepared Au catalysts in which small Au particles were inserted inside the pores. Fe(NO 3 ) 3 ·9H 2 O and tetraethylammonium hydroxide (TEAOH) were adopted as metal precursor and precipitant/structure directing agent, respectively.…”

Section: Goldmentioning

confidence: 99%

Embedded Phases: A Way to Active and Stable Catalysts

et al. 2010

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Industrial catalysts are typically made of nanosized metal particles, carried by a solid support. The extremely small size of the particles maximizes the surface area exposed to the reactant, leading to higher reactivity. Moreover, the higher the number of metal atoms in contact with the support, the better the catalyst performance. In addition, peculiar properties have been observed for some metal/metal oxide particles of critical sizes. However, thermal stability of these nanostructures is limited by their size; smaller the particle size, the lower the thermal stability. The ability to fabricate and control the structure of nanoparticles allows to influence the resulting properties and, ultimately, to design stable catalysts with the desired characteristics. Tuning particle sizes provides the possibility to modulate the catalytic activity. Unique and unexpected properties have been observed by confining/embedding metal nanoparticles in inorganic channels or cavities, which indeed offers new opportunities for the design of advanced catalytic sytems. Innovation in catalyst design is a powerful tool in realizing the goals of more green, efficient and sustainable industrial processes. The present Review focuses on the catalytic performance of noble metal‐ and non precious metal‐based embedded catalysts with respect to traditional impregnated systems. Emphasis is dedicated to the improved thermal stability of these nanostructures compared to conventional systems.

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“…(2) can we find active gold catalysts based on previously overlooked supports (e.g., metal phosphates)? In addition, the effects of the crystal phase [65,82,[96][97][98][99][100], size [99,[101][102][103][104][105][106][107][108], and shape [45,[108][109][110][111][112][113][114] of solid supports on the catalytic performance are also of interest. Below we first present the development of Au/SiO 2 and Au/metal phosphate catalysts in our group, and then highlight recent findings on the effects of the particle size and shape of solid supports.…”

Section: General Considerationsmentioning

confidence: 99%

“…The authors proposed, based on diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) data, that the OH groups bonding to γ-Al 2 O 3 nanofibers may facilitate CO oxidation. Zhong and co-workers dispersed gold colloids onto porous α-Fe 2 O 3 nanorods, and found that the resulting catalyst was more active than gold nanoparticles dispersed on commercial α-Fe 2 O 3 [45]. Cao and coworkers found that the activity of Au/β-MnO 2 nanorods was higher than that of Au/commercial β-MnO 2 particulates in the solvent-free aerobic oxidation of alcohol [111].…”

Section: Effect Of the Particle Morphology Of The Supportmentioning

confidence: 99%

Development of novel supported gold catalysts: A materials perspective

2010

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Since Haruta et al. discovered that small gold nanoparticles finely dispersed on certain metal oxide supports can exhibit surprisingly high activity in CO oxidation below room temperature, heterogeneous catalysis by supported gold nanoparticles has attracted tremendous attention. The majority of publications deal with the preparation and characterization of conventional gold catalysts (e.g., Au/TiO 2 ), the use of gold catalysts in various catalytic reactions, as well as elucidation of the nature of the active sites and reaction mechanisms. In this overview, we highlight the development of novel supported gold catalysts from a materials perspective. Examples, mostly from those reported by our group, are given concerning the development of simple gold catalysts with single metal-support interfaces and heterostructured gold catalysts with complicated interfacial structures. Catalysts in the first category include active Au/SiO 2 and Au/metal phosphate catalysts, and those in the second category include catalysts prepared by pre-modification of supports before loading gold, by post-modification of supported gold catalysts, or by simultaneous dispersion of gold and an inorganic component onto a support. CO oxidation has generally been employed as a probe reaction to screen the activities of these catalysts. These novel gold catalysts not only provide possibilities for applied catalysis, but also furnish grounds for fundamental research.

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Synthesis of Porous α-Fe₂O₃ Nanorods and Deposition of Very Small Gold Particles in the Pores for Catalytic Oxidation of CO

Cited by 163 publications

References 50 publications

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe₂O₃Catalysts

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe₂O₃Catalysts

Embedded Phases: A Way to Active and Stable Catalysts

Development of novel supported gold catalysts: A materials perspective

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Synthesis of Porous α-Fe2O3 Nanorods and Deposition of Very Small Gold Particles in the Pores for Catalytic Oxidation of CO

Cited by 163 publications

References 50 publications

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe2O3Catalysts

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe2O3Catalysts

Embedded Phases: A Way to Active and Stable Catalysts

Development of novel supported gold catalysts: A materials perspective

Contact Info

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Synthesis of Porous α-Fe₂O₃ Nanorods and Deposition of Very Small Gold Particles in the Pores for Catalytic Oxidation of CO

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe₂O₃Catalysts

Low Temperature Oxidation of Carbon Monoxide over Mesoporous Au-Fe₂O₃Catalysts