Three-Dimensionally Ordered Mesoporous Niobium Oxide

Lee, Byongjin; Lu, Daling; Kondo, Junko N.; Domen, Kazunari

doi:10.1021/ja026838z

Cited by 122 publications

(57 citation statements)

References 18 publications

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“…Fig. 5A shows that all of the Co 3 O 4 catalysts exhibited type IV isotherms with an obvious hysteresis phenomenon, indicating the presence of mesoporous structures in these catalysts [43][44][45]. In contrast, the hysteresis loops of the Co 3 O 4 -P and Co 3 O 4 -1.00 catalysts were located in the relative pressure (p/p 0 ) range of 0.8-1.0, which were much smaller than those of Co 3 O 4 -n (n = 0.01, 0.05, 0.10) with a different location in the relative pressure (p/p 0 ) range of 0.6-1.0.…”

Section: Textural Properties Of Co 3 O 4 Catalystsmentioning

confidence: 98%

Fabrication of mesoporous Co3O4 oxides by acid treatment and their catalytic performances for toluene oxidation

Zhang

Zhong

et al. 2018

Applied Catalysis A: General

168

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A B S T R A C TConsidering the harmful effects of volatile organic compounds (VOCs) on the atmosphere and public health, the search for proper catalytic materials for the effective catalytic elimination of VOCs remains one of the most pressing issues in the environmental field. In this study, a series of mesoporous Co 3 O 4 -n (n = 0.00, 0.0001, 0.01, 0.05, 0.10, 1.00, representing the concentration of HNO 3 aqueous solution) catalysts were fabricated by the acid treatment of Co 3 O 4 that was previously prepared via a hydroxycarbonate precipitation method (Co 3 O 4 -P). The catalytic performances of the prepared catalysts were evaluated for the model reaction of toluene oxidation. An obvious enhancement of catalytic activity in the reaction was achieved over the acid-treated Co 3 O 4 catalysts using lower HNO 3 concentrations, with Co 3 O 4 -0.01 exhibiting the optimum catalytic activity (T 90 = 225°C, 15°C lower than that of Co 3 O 4 -P), excellent catalytic durability under dry conditions and a high regeneration capability under humid conditions. Benefitting from the dilute acid treatment, the Co 3 O 4 -n (n = 0.01, 0.05, 0.10) catalysts presented higher specific surface areas, more weak acidic sites and higher abundances of surface Co 2+ and O ads species, which were regarded as the key factors responsible for their enhanced catalytic activities.

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Section: Textural Properties Of Co 3 O 4 Catalystsmentioning

confidence: 98%

Fabrication of mesoporous Co3O4 oxides by acid treatment and their catalytic performances for toluene oxidation

Zhang

Zhong

et al. 2018

Applied Catalysis A: General

168

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“…Domen and co-workers synthesized mesoporous niobium oxide with three-dimensional structure and excellent textural parameters. 168 The initial wormhole-like mesoporous structure was dramatically changed to highly ordered three-dimensional arrays by the addition of cations under precisely controlled conditions. Zhu et al successfully prepared various mesoporous metal oxides using organic functionalized mesoporous silica as template that involves the adsorption of inorganic precursors onto the amine-functionalized mesoporous silica materials and the thermal decomposition of the precursor to assemble the individual metal hydroxide nanoparticles in the mesochannels followed by subsequent removal of the amine-functionalized silica by hydrofluoric acid.…”

Section: Component Innovationmentioning

confidence: 99%

Nanoarchitectonics for Mesoporous Materials

Ariga

Vinu

Yamauchi

et al. 2011

Bulletin of the Chemical Society of Japan

715

411

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Although mesoporous materials have well-defined pore structures, these fine materials can surprisingly be produced by employing a set of conventional and simple procedures such as mixing, heating, filtration, and washing, using low-cost materials. They can be regarded as easy-to-make bulk nanostructured materials. Mesoporous materials have great potential for use in both macroscopic applications and nanotechnology. In this account, we introduce examples of recent developments in mesoporous materials involving innovations in their components and structural designs and concentrating on our own recent progress. These examples include syntheses of mesoporous silica, metal oxides, semiconductive materials, metals, alloys, organic composites, biomaterial composites, carbon, carbon nitride, and boron nitride, as innovative components. As structural innovations for mesoporous materials, various film preparations, pore alignments, and hierarchic structures are described together with their related functions including sensing and controlled release of target molecules. Why Mesoporous Materials? Bulk Quantities and Precise StructuresThere is little doubt that nanotechnology and related technologies are making significant contributions to current research and development which will eventually be felt in our day-to-day lives. Device miniaturization in such products as cellular phones and portable computers has irrevocably changed our lifestyles. Portable devices allow us to work and communicate wherever we are in the world in contrast to the previous situation where machine operation required a human presence. Greater freedom in our work and leisure dispositions should diminish over-concentration of populations in cities and may ultimately reduce energy consumption and waste production.So far, device innovations have been due to development of top-down approaches, especially sophisticated microfabrication techniques. 17 However, those top-down techniques are not useful for materials innovation where chemical processes are used as the operating principle. Rather, so-called bottom-up approaches are expected to create novel functional materials having well-controlled structural features with nanometric precision. Bottom-up approaches rely on self-assembly processes to form selected structures through spontaneous association of atoms, molecules, clusters, and particles. 818 Furthermore, assisted assembly techniques using external influences are provided by LangmuirBlodgett (LB) method 1928 and layer-by-layer (LbL) adsorption 2936 and provide significant contributions for materials' fabrication. According to these concepts, molecular complex formation, 3741 molecular array control, 4252 and microscopic structural design 5361 have been widely investigated leading to generation of a large quantity of scientific knowledge.Ideally, materials should be produced in a series of easy processes to yield bulk quantity without loss of nanometric structural features and some categories of material already satisfy this condition. For exampl...

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“…Another peak appears around 1.4-1.7 , which reveals the present of long-range ordered mesostructures in these composite oxides. 26,27 The wide-angle X-ray diffraction (WXRD) patterns of the as-prepared mesoporous oxides are shown in Fig. S1.…”

Section: Physicochemical Properties Of Mesoporous Solid Acid Catalystsmentioning

confidence: 99%

Selective hydrodeoxygenation of 5-hydroxy-2(5H)-furanone to γ-butyrolactone over Pt/mesoporous solid acid bifunctional catalyst

Chen

Yuan

2017

RSC Adv.

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Selective hydrodeoxygenation of 5-hydroxy-2(5H)-furanone (HFO) derived from furfural oxidation to gbutyrolactone (GBL) provides a sustainable alternative to the petroleum-based process for gbutyrolactone production. Furfural is first converted to HFO through selective photocatalytic oxidation by using air oxygen as the oxidant (yield: 85.0%). HFO is further converted to GBL through hydrodeoxygenation over noble-metal nanoparticles on mesoporous Nb-Zr mixed oxides. The conversion of HFO to GBL involves two reactions: hydrogenation catalyzed by active metal and dehydration over mesoporous solid acids. The catalytic properties of M/Nb-Zr mixed oxides (M ¼ Pt, Ir, Ru, Rh and Pd) are related to the composition of support and active metal. The incorporation of zirconia into matrixes improves the thermal stability of mesoporous mixed oxides and increases the amounts of surface acid, which contributes to its catalytic selectivity to GBL. Pt/Nb 5 Zr 5 -550 exhibited the best catalytic performances with 97.3% selectivity of GBL at full conversion. The excellent performance can be correlated with the cooperative effect between active metal species and acid sites. The Pt-solid acid bifunctional catalysts show superior catalytic performance compared with conventional catalysts, such

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Three-Dimensionally Ordered Mesoporous Niobium Oxide

Abstract: Three-dimensionally ordered mesoporous niobium oxide was prepared by a neutral templating route with the addition of a trace amount of cations, which have 5- and 2-nm pore diameter and wall thickness, respectively.

Cited by 122 publications

References 18 publications

Fabrication of mesoporous Co3O4 oxides by acid treatment and their catalytic performances for toluene oxidation

Fabrication of mesoporous Co3O4 oxides by acid treatment and their catalytic performances for toluene oxidation

Nanoarchitectonics for Mesoporous Materials

Selective hydrodeoxygenation of 5-hydroxy-2(5H)-furanone to γ-butyrolactone over Pt/mesoporous solid acid bifunctional catalyst

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