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Structure and reactivity of titanium...

Hsieh, Shuchen.

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Structure and reactivity of titanium-platinum and titanium oxide-platinum interfaces.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Structure and reactivity of titanium-platinum and titanium oxide-platinum interfaces./
Author:	Hsieh, Shuchen.
Description:	135 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 6103.
Contained By:	Dissertation Abstracts International64-12B.
Subject:	Chemistry, Physical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3116714

Structure and reactivity of titanium-platinum and titanium oxide-platinum interfaces.
Hsieh, Shuchen.

Structure and reactivity of titanium-platinum and titanium oxide-platinum interfaces. - 135 p.

Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 6103.

Thesis (Ph.D.)--University of Southern California, 2003.

Pt supported on TiO2 is famous as the first catalyst that revealed the "strong-metal support interaction" (SMSI) in methanation and methanol production from CO+H2. It was observed that the amount of CO and H2 that chemisorbed onto the Pt/TiO2 surface under high-temperature reducing conditions was significantly diminished.Subjects--Topical Terms:

560527
Chemistry, Physical.

Structure and reactivity of titanium-platinum and titanium oxide-platinum interfaces.
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100 1 $a Hsieh, Shuchen. $3 1953578
245 1 0 $a Structure and reactivity of titanium-platinum and titanium oxide-platinum interfaces.
300 $a 135 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-12, Section: B, page: 6103.
500 $a Adviser: Bruce E. Koel.
502 $a Thesis (Ph.D.)--University of Southern California, 2003.
520 $a Pt supported on TiO2 is famous as the first catalyst that revealed the "strong-metal support interaction" (SMSI) in methanation and methanol production from CO+H2. It was observed that the amount of CO and H2 that chemisorbed onto the Pt/TiO2 surface under high-temperature reducing conditions was significantly diminished.
520 $a Studies here were designed to help understand SMSI in Pt/TiO2 catalysts at an atomic level. Our approach was to create model systems by preparing ordered Ti/Pt(111) and Ti/Pt(100) alloys and studying CO and H 2 chemisorption on these surfaces. Further, we investigated how oxidizing these alloy surfaces could lead to formation of ordered TiOx structures on Pt(100) and Pt(111). These studies will help lay the ground work for atomic level design of surfaces with desirable properties. In these studies, we utilized several surface analytical techniques.
520 $a Composition and structure were characterized by alkali ion scattering spectroscopy (ALISS), X-ray photoelectron diffraction (XPD), X-ray photoelectron spectroscopy (XPS), and scanning tunneling microscopy (STM). Reactivity was probed by examining the chemisorption behavior using temperature programmed desorption (TPD).
520 $a We found that for both the Ti/Pt(111)-(2 x 2) and Ti/Pt(100)-c(2 x 2) alloys, the top surface is composed of pure Pt, with 25% Ti and 50% Ti in the second layer of each, respectively. Alloying with Ti reduces the reactivity of Pt for adsorbing CO and H2. XPS revealed a chemical shift in the Ti/Pt(100)-c(2 x 2) alloy for the Ti 2p peak of 1.5 eV to higher binding energy than that of a thick Ti film. XPS also showed that the Ti 2p peak from the Ti/Pt(111)-p(2 x 2) is shifted by 1.4 eV to higher binding energy than that of a thick Ti film, thus indicating a strong electronic interaction due to alloying.
520 $a Oxidizing a Ti/Pt(100)-c(2 x 2) surface alloy with O2, O 3, or NO2, produced ordered TiOx structures on Pt(100) surfaces. A rich diversity of structures could be created using different annealing temperatures and Ti coverages. In the case of a Ti/Pt(111)-p(2 x 2) surface alloy, we found that NO2 provided a sufficient oxygen coverage on the surface at room temperature to form TiOx on Pt(111), but O2 did not.
590 $a School code: 0208.
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Physics, Condensed Matter. $3 1018743
690 $a 0494
690 $a 0794
690 $a 0611
710 2 0 $a University of Southern California. $3 700129
773 0 $t Dissertation Abstracts International $g 64-12B.
790 1 0 $a Koel, Bruce E., $e advisor
790 $a 0208
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3116714