Template-assisted synthesis of porous molybdenum dioxide nanofibers and nanospheres by redox etching method

Wang, Shutao; Zhang, Yange; Wang, Weizhi; Li, Guoliang; Ma, Xuchu; Li, Xuebing; Zhang, Zude; Qian, Yitai

doi:10.1016/j.jcrysgro.2005.10.149

Cited by 28 publications

(18 citation statements)

References 32 publications

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“…In our previous work [21], porous MoO 2 nanospheres with the average diameter of about 260-500 nm have been successfully obtained through redox etching of MoO 3 template. It has been proved that AHM can also be reduced with ethanol in 1.65 M HNO 3 solution.…”

Section: Effect Of Egmentioning

confidence: 99%

“…5 is reminding of the one dimensional (1D) growth habit of MoO 3 [24]. Then reduction MoO 3 of via C 2 H 5 OH in acid environment has been studied previously [21]. FTIR spectra show the samples contain a small amount of organic species from the complex reaction, which could be removed by following calcination [12], since heat-treated sample 1 became FTIR inactive.…”

Section: Article In Pressmentioning

confidence: 99%

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Ethanothermal reduction to MoO2 microspheres via modified Pechini method

Wang

Zhang

et al. 2006

Journal of Crystal Growth

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Section: Effect Of Egmentioning

confidence: 99%

Section: Article In Pressmentioning

confidence: 99%

Ethanothermal reduction to MoO2 microspheres via modified Pechini method

Wang

Zhang

et al. 2006

Journal of Crystal Growth

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“…Examples include hydrothermal synthesis, template or host molecule-involved synthesis, and electrochemical processes. The morphologies of rods, [2][3][4] wires, [5] tubes, [6] belts, [7,8] ribbons, [9] rings, [10] have been prepared. However, little attention was paid to catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

High Catalytic Efficiency of Nanostructured Molybdenum Trioxide in the Benzylation of Arenes and an Investigation of the Reaction Mechanism

Wang

Ueda

2008

Chemistry A European J

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The synthesis and characterization of nanostructured MoO(3) with a thickness of about 30 nm and a width of about 450 nm are reported. The composition formula of the MP (precipitation method) precursor was estimated to be [(NH(4))(2)O](0.169) x MoO(3) x (H(2)O)(0.239). The calcination of the precursor in air afforded nanostructured pellets of the alpha-MoO(3) phase. The nanostructured MoO(3) catalyst exhibited high efficiency in catalyzing the benzylation of various arenes with substituted benzyl alcohols, which were strikingly different to common bulk MoO(3). Most reactions offered >99% conversion and >99% selectivity to monoalkylated compounds. MoO(3) is a typical acid catalyst. However, the benzylation reaction over nanostructured MoO(3) does not belong to the acid-catalyzed type or defect site-catalyzed type, since the catalyst has no acidity and defect site on surface. Characterization with thermal, spectroscopic, and electronic techniques reveal that the catalyst contains fully oxygen-coordinated MoO(6) octahedrons on the surface but partially reduced species (Mo(5+)) within the bulk phase. The terminal oxygen atoms of Mo=O bonds on the (010) basal plane resemble oxygen anion radicals and act as active sites for the adsorption and activation of benzyl alcohols by electrophilic attack. Such sites are indispensable for catalytic reactions since the blocking of these sites by electron acceptors, such as tetracyanoethylene (TCNE), can greatly decrease catalytic activity. This work represents a successful example of combining a heterogeneous catalysis study with nanomaterial synthesis.

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“…Molybdenum oxides with average valence of less than six are excellent catalysis for the partial oxidation of alkenes [11]. Their catalytic properties can be controlled by varying the surface structures of oxides or change the valence state of molybdenum atoms [12]. MoO 2 is a good precursor for the synthesis of many other important materials such as Mo, MoO 3 and MoO 3Àx [13].…”

Section: Introductionmentioning

confidence: 99%

“…Li et al prepared MoO 2 nanowires reductively from an alkaline MoO 4 2À solution on to highly oriented pyrolitic graphite surfaces [17]. Porous molybdenum dioxide nanofibers and nanospheres were prepared by redox method using MoO 3 with N 2 H 4 ÁH 2 O in aqueous terphthalic acid medium [12]. Manthiram and co-workers have investigated the reduction of Na 2 MoO 4 with NaBH 4 and similarly, the reduction of K 2 MoO 4 with KBH 4 to synthesize MoO 2 [18].…”

Section: Introductionmentioning

confidence: 99%

Organic assisted hydrothermal route to MoO2/HDA composite microspheres and their characterization

Nagaraju¹,

Thipperudraiah²,

Chandrappa³

2008

Materials Research Bulletin

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Synthesis of molybdenum oxide/hexadecylamine (MoO 2 /HDA) microspheres in aqueous solution has been investigated systematically by varying the concentration of the precursor, surfactant and reducing agent, as well as the reaction temperature and duration. To understand this, the nature of the solid has been probed by PXRD, FTIR, UV-visible and SEM equipped with an EDS. The PXRD patterns of as-prepared products reveal that MoO 2 microspheres are of monoclinic structure. The bands at 985 and 952 cm À1 reflect the n(Mo-O) stretch vibration of terminal -Mo VI O t and -Mo IV O t groups. UV-vis spectrum of calcined sample exhibits maximum absorption at 358 nm. SEM images reveal that the average diameters of the MoO 2 microspheres are in the range 1-3 mm. The reduction of the precursor yields a metastable poorly crystalline oxide of lower valence molybdenum, which is crystallized to a-MoO 3 on calcination to 400 8C. #

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Template-assisted synthesis of porous molybdenum dioxide nanofibers and nanospheres by redox etching method

Cited by 28 publications

References 32 publications

Ethanothermal reduction to MoO2 microspheres via modified Pechini method

Ethanothermal reduction to MoO2 microspheres via modified Pechini method

High Catalytic Efficiency of Nanostructured Molybdenum Trioxide in the Benzylation of Arenes and an Investigation of the Reaction Mechanism

Organic assisted hydrothermal route to MoO2/HDA composite microspheres and their characterization

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