Synthesis and electronic property of platinum nanowire and nanoparticle in mesoporous silica template

Fukuoka, Atsushi; Sakamoto, Yuzuru; Higuchi, Tetsuya; Ichikawa, Masaru

doi:10.1007/s10934-006-8009-2

Cited by 15 publications

(16 citation statements)

References 26 publications

(35 reference statements)

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“…In the present study, SBA-15 was employed as a candidate catalyst for the ODH of isobutane. FSM-16, MCM-41, and SBA-15 are all examples of mesoporous silica based on a uniform hexagonal structure (Fukuoka et al, 2006;Hoffmann et al, 2006). However, the pore sizes of SBA-15 are greater than those of either FSM-16 or MCM-41 and can be controlled within a wider range (6-15 nm) by manipulating the interconnections between mesopores and micropores (Miyazawa and Inagaki, 2000;Zhao et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Introduction of a Small Amount of Chromium to Enhance the Catalytic Performance of SBA-15 for the Oxidative Dehydrogenation of Isobutane to Isobutene

Kato

Misu

Shimazu

et al. 2018

J. Chem. Eng. Japan / JCEJ

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Various solid oxide catalysts are active for the oxidative dehydrogenation of propane, but achieve yields of less than 2% when these were used for the oxidative dehydrogenation of isobutane to isobutene. An improved isobutene yield of 8% was obtained in the oxidative dehydrogenation of isobutane by using a folded-sheet mesoporous material (FSM-16) and mesoporous molecular sieve (MCM-41), with or without chromium via impregnation or template-ion exchange methods. Further activity enhancement, however, could not be attained. In the present study, chromium cations were introduced into the framework of SBA-15 using a direct synthesis method by mixing chromium nitrate with tetraethylorthosilicate in an aqueous solution with an initial pH of 1.5 and subsequent hydrothermal treatment. Loading the resultant catalyst, SBA-15, with a small amount of chromium (1.84 wt% Cr-SBA-15) increased the isobutene yield (15.4%) at 723 K, while a previous report showed that chromium oxide supported on SBA-15 (CrOx/SBA-15) prepared via incipient wetness impregnation had a lower isobutene yield (11%) at 813 K. To explain this improvement, the catalysts were characterized using X-ray diffraction, transmission electron microscopy, N 2 adsorption-desorption, and NH 3 temperature-programmed desorption. Cr-SBA-15 was found to have a large specific surface area (1,610 m 2 /g), although the structural and acidic nature of the catalyst was similar to the general properties of other mesoporous silicas. The conversion of Cr 3+ species into Cr 6+ on Cr-SBA-15 with the large specific surface area could affect the improvement of the oxidative dehydrogenation of isobutane to isobutene.

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Section: Introductionmentioning

confidence: 99%

Introduction of a Small Amount of Chromium to Enhance the Catalytic Performance of SBA-15 for the Oxidative Dehydrogenation of Isobutane to Isobutene

Kato

Misu

Shimazu

et al. 2018

J. Chem. Eng. Japan / JCEJ

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“…500-1000 m 2 g -1 ), which are attractive as catalysts and supports. However, the 75 understanding the role of mesoporous silica is generally limited to give higher dispersion of active sites than over the conventional silica. From the viewpoint of molecular level, the participation of mesoporous silica in the catalytic reactions is through the silanols (or hydroxyl groups) on the 80 surface.…”

Section: Promotional Effect Of Mesoporous Silica For Prox Reactionmentioning

confidence: 99%

“…75 The surface area and dispersion of Pt nanoparticles over mesoporous silica are higher than those of conventional SiO 2 -and Al 2 O 3 -90 supported catalysts (Table 1). conversion less than 30% under the same reaction conditions, and require 423 K or even higher temperature to remove majority of CO. 25 In particular, Pt(p)/FSM-16 gives ca.…”

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confidence: 94%

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Green catalysis for selective CO oxidation in hydrogen for fuel cell

Huang

Hara

Fukuoka

2009

Energy Environ. Sci.

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5Preferential oxidation of carbon monoxide in excess hydrogen (PROX) is one of the key processes for the production of clean hydrogen fuel for the polymer electrolyte membrane fuel cell (PEFC). Development of highly active and selective catalysts is among the most challenging works for decades. Platinum-based catalysts are regarded as the most promising candidates for this process. However, the activities of Pt catalysts seriously suffer from the strong poisonous adsorption by CO 10 substrate at low reaction temperature. This article addresses the present approaches to improve the catalytic performance under the low temperature. The focus in this article is the finding over the Pt/mesoporous silica catalyst. The high activity and selectivity of this catalyst has been attributed to the surface silanols in mesoporous silica. The perspectives of Pt/mesoporous silica in the PROX reaction are also presented.

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“…One reason is probably due to the fact that noble metals, such as Pt, iridium (Ir), Pd, etc., have highly symmetric facecentered cubic (fcc) crystal structures, which will affect the growing progress of the crystals. Until now, various synthesis methods have been developed to grow Pd nanowires using either template-directed synthesis [11] or solution-phase techniques [12]. For instance, Nevin et al synthesized vertically grown Pd nanowire array using anodic aluminum oxide (AAO) template attached with silver epoxy to Ti foil as substrate [13].…”

Section: Introductionmentioning

confidence: 99%