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Synthesis of titanium-vanadium oxide...

Case Western Reserve University.

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Synthesis of titanium-vanadium oxide materials from aqueous solutions via co-deposition.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Synthesis of titanium-vanadium oxide materials from aqueous solutions via co-deposition./
Author:	Shyue, Jing-Jong.
Description:	283 p.
Notes:	Adviser: Mark R. De Guire.
Contained By:	Dissertation Abstracts International65-08B.
Subject:	Chemistry, Inorganic. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3146451
ISBN:	9780496040995

Synthesis of titanium-vanadium oxide materials from aqueous solutions via co-deposition.
Shyue, Jing-Jong.

Synthesis of titanium-vanadium oxide materials from aqueous solutions via co-deposition. - 283 p.

Adviser: Mark R. De Guire.

Thesis (Ph.D.)--Case Western Reserve University, 2004.

Titania-supported vanadium oxide is an important heterogeneous catalyst in a variety of applications. Therefore, the synthesis of mixed titanium-vanadium oxide films may be of interest for potential catalysts. While most vanadium-based catalysts consist of a vanadium oxide phase deposited on the surface of an oxide support, mixed titanium-vanadium oxides were co-deposited from aqueous solutions in a single step.

ISBN: 9780496040995Subjects--Topical Terms:

517253
Chemistry, Inorganic.

Synthesis of titanium-vanadium oxide materials from aqueous solutions via co-deposition.
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020 $a 9780496040995
035 $a (UMI)AAI3146451
035 $a AAI3146451
040 $a UMI $c UMI
100 1 $a Shyue, Jing-Jong. $3 1025145
245 1 0 $a Synthesis of titanium-vanadium oxide materials from aqueous solutions via co-deposition.
300 $a 283 p.
500 $a Adviser: Mark R. De Guire.
500 $a Source: Dissertation Abstracts International, Volume: 65-08, Section: B, page: 4237.
502 $a Thesis (Ph.D.)--Case Western Reserve University, 2004.
520 $a Titania-supported vanadium oxide is an important heterogeneous catalyst in a variety of applications. Therefore, the synthesis of mixed titanium-vanadium oxide films may be of interest for potential catalysts. While most vanadium-based catalysts consist of a vanadium oxide phase deposited on the surface of an oxide support, mixed titanium-vanadium oxides were co-deposited from aqueous solutions in a single step.
520 $a The chemical composition of the titanium-vanadium oxide thin films on organic self-assembled monolayers (SAMs) was manipulated by chelating agents, including lactic acid and oxalic acid. Based on the dependence of Ti:V ratio in the films on the oxalic acid concentration, it is concluded that oxalic acid chelates both titanium and vanadium, but preferentially vanadium. Therefore, from solutions with [oxalate]:[vanadium] < 1:1, titanium-enriched films were formed. However, with [oxalate]: [vanadium] > 1:1, excess oxalic acid chelates titanium as well. Consequently, the Ti:V ratio dropped back to that of films deposited in the absence of chelating agents. At high concentrations of oxalic acid, both titanium and vanadium was chelated excessively. Therefore, no films formed. Lactic acid can be oxidized by pentavalent vanadium, so that it cannot chelate cations. Therefore, when [lactate]: [vanadium] < 1:2, V4+ was formed. These V4+ ions increased the deposition rate of vanadium, and vanadium-rich films were formed. For [lactate]:[vanadium] > 1:2, the remaining lactic acid preferentially chelate vanadium and showed effects comparable to those seen with oxalic acid. The vanadium content in the mixed oxide films affected the thickness of films formed on the alkylammonium SAMs but had little or no effect on the films formed on amine SAMs. This result is consistent with the presence of a Stern layer, previously reported to form on amine-terminated surfaces.
520 $a In addition to forming thin films, titanium-vanadium oxide solid-solution powders were also prepared via co-deposition. The chemical composition of the oxide was adjusted by controlling the precursor concentration and the concentration of chelating agent (oxalic acid). Semi-empirical equations were successfully used to model the relative deposition rates of titanium and vanadium. A computer program was developed and used to predict the solid composition that can be expected from a given solution composition. The calculated composition agrees well with the experimental compositions determined by X-ray energy-dispersive spectroscopy (XEDS). (Abstract shortened by UMI.)
590 $a School code: 0042.
650 4 $a Chemistry, Inorganic. $3 517253
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0488
690 $a 0794
710 2 $a Case Western Reserve University. $3 1017714
773 0 $t Dissertation Abstracts International $g 65-08B.
790 $a 0042
790 1 0 $a De Guire, Mark R., $e advisor
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3146451