Surface and catalytic properties of doped tin oxide nanoparticles

Wang, Chien-Tsung; Lai, De-Lun; Chen, Miao-Ting

doi:10.1016/j.apsusc.2010.06.048

Cited by 19 publications

(13 citation statements)

References 21 publications

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“…We consider that the atomic mixing of V with Ti in oxide causes not only to generate active redox sites but also weaken the acidic strength associated with TiO 2 . This is similarly found for methanol oxidation over V‐doped SnO 2 nanoparticles prepared by a coprecipitation method, favoring the production of formaldehyde 2 . For methanol oxidation over vanadium oxide deposited on titania prepared by chemical vapor deposition, the methoxide species in Ti–OCH 3 groups can move via reverse spillover from Ti to V centers, with formaldehyde production at lower temperatures over the vanadium center 1 …”

Section: Resultsmentioning

confidence: 67%

“…Low levels of dopants in mixed oxides may generate surface states and/or electronic structures so as to have a major impact on the chemical reactivity or electrical conductivity of the materials. Recent papers that have appeared about dopants for use in catalysis and sensing processes mainly discuss an efficacy of reducing reaction temperature by modifying host oxides 1–4 …”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Iron- and Vanadium-Doped Titania Aerogel Nanopowders

Wang

Lai

2011

Journal of the American Ceramic Society

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Nanopowders of anatase Fe x V 0.05 Ti 0.95Àx O y (x 5 0, 0.02) solid solutions have been synthesized by a sol-gel process with ensuing supercritical drying. Changes in the surface state and crystal structure about the iron doping were characterized by X-ray photoelectron spectroscopy (XPS), electron spin resonance, and X-ray diffraction. XPS revealed an electronic interaction between Fe and V atoms in the ternary compound and the formation of Fe and V redox pairs on the surface. The oxide aerogels were evaluated as catalyst for methanol oxidation. Formaldehyde was favorably produced over the V-doped titania, and the Fe addition enhanced the rate of carbon oxides formation. Results demonstrate that the reducible Fe-O-V bond acts as active sites and influences product distribution. The competitive reactivity between Fe and V sites is responsible for the transformation of surface nature from redox to basic characters. The ceramic nanostructures are promising materials for use in many processes involving electron transfer.

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Section: Resultsmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Iron- and Vanadium-Doped Titania Aerogel Nanopowders

Wang

Lai

2011

Journal of the American Ceramic Society

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“…In addition, pure SnO 2 is not a good oxidation catalyst due to its low activity. For example, the oxidation of methanol over SnO 2 is accelerated at temperatures above 300°C . The reactivity of this oxide, associated with oxygen ions O − on the bridging sites of the SnO 2 (110) plane or oxygen defects formed (O − removed), tends to be thermodynamically favorable.…”

Section: Introductionmentioning

confidence: 99%

Vanadium‐Tin Oxide Nanoparticles with Gas‐Sensing and Catalytic Activity

2011

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Nanopowders of vanadium-tin oxides were prepared by a co-precipitation process and characterized for their bulk structures, chemical state, sensing capability, and surface reactivity. The solid solutions (cassiterite) were evaluated as sensing elements in a carbon monoxide gas sensor and as catalysts for methanol oxidation in a fixed-bed reactor. Sensing and catalytic properties were observed dependent upon doping concentration and oxidation state of vanadia species. The sensor response was favored for lower vanadium loadings (V/Sn = 0.05À0.1), related to the reduced vanadium sites. The catalytic activity for methanol conversion was favored for higher vanadium loadings (V/Sn = 0.15À0.2), related to the oxidized vanadium sites. Results demonstrate that the V-O-Sn structure provides redox activity to facilitate oxygen activation for CO gas-sensing response and promote methanol partial oxidation to formaldehyde. Mechanistic aspects that elucidate the redox pathways are discussed. These oxide nanostructures are promising ceramic materials for use in sensing and catalysis fields involving electron transfer. D. Damjanovic-contributing editorManuscript No. 29386.

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“…In recent years, researches of TiO2-SnO2 supporting metallic oxides catalysts develop fast. Chien-Tsung Wang et al [2] demonstrated that the bridging dopant-O-Sn bond in TiO2-SnO2 support acted as active sites and influences product distribution. The advance of TiO2-SnO2 solid solution were also proved by other researchers.…”

Section: Introductionmentioning

confidence: 99%

Influence of ceria modification on the properties of TiO2-SnO2 supporting V2O5 catalysts for selective catalytic reduction of NO by NH3

Yong-jin¹,

Huang²,

Zhang³

et al. 2017

2nd Annual International Conference on Energy, Environmental &Amp; Sustainable Ecosystem Development (EESED 2016)

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A series of V2O5-CeO2/TiO2-SnO2 catalysts were prepared with different CeO2 content to investigate the effect of Ce modification for selective catalytic reduction of NO by NH3. The obtained samples were characterized by BET, XRD, HRTEM,H2-TPR and FT-IR. The catalytic test was also investigated on a fixed bed reactor under the condition of simulated composition of flue gas. The results revealed that the V2O5-CeO2/TiO2-SnO2 catalyst with 10% CeO2 content (i.e. the molar ratio of Ce to Ti) showed the highest catalytic activity within the wide temperature range of 290˚C to 430˚C, even higher than V2O5-10wt. %WO3/TiO2-SnO2. Larger BET specific surface area and average pore volume, better dispersion of CeO2 on support and lower degree of crystallinity would enhance the performance of selective catalytic reduction. Furthermore, Ce modifier could strengthen redox properties of catalysts, which was beneficial for decreasing reduction temperature. Finally, FT-IR demonstrated that significant amounts of Lewis and Brønsted acidity also contributed to the catalytic reaction process.

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Surface and catalytic properties of doped tin oxide nanoparticles

Cited by 19 publications

References 21 publications

Synthesis and Characterization of Iron- and Vanadium-Doped Titania Aerogel Nanopowders

Synthesis and Characterization of Iron- and Vanadium-Doped Titania Aerogel Nanopowders

Vanadium‐Tin Oxide Nanoparticles with Gas‐Sensing and Catalytic Activity

Influence of ceria modification on the properties of TiO2-SnO2 supporting V2O5 catalysts for selective catalytic reduction of NO by NH3

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