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Sonochemical preparation and charact...

Zhang, Lizhi.

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Sonochemical preparation and characterization of nanoporous transition metal oxides for environmental catalysis.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Sonochemical preparation and characterization of nanoporous transition metal oxides for environmental catalysis./
Author:	Zhang, Lizhi.
Description:	120 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4381.
Contained By:	Dissertation Abstracts International64-09B.
Subject:	Chemistry, Physical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3104894

Sonochemical preparation and characterization of nanoporous transition metal oxides for environmental catalysis.
Zhang, Lizhi.

Sonochemical preparation and characterization of nanoporous transition metal oxides for environmental catalysis. - 120 p.

Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4381.

Thesis (Ph.D.)--Chinese University of Hong Kong (People's Republic of China), 2003.

A series of single and multi-component nanoporous transition metal oxides were prepared by sonochemical processing. This is based on a new idea that the controlled condensation and agglomeration of monodispersed sol particles would form a nanoporous structure with a narrow pore size distribution under ultrasound irradiation. Therefore, nanoporous transition metal oxides may be obtained without using surfactant templates. X-ray diffraction (XRD), nitrogen adsorption, UV-vis diffuse reflectance spectrometry, transmission electron microscopy (TEM), infrared (IR) spectrometry, thermalgravimetric analysis (TGA) and differential thermal analysis (DTA) were used to characterize the resulting materials. Compared with conventional surfactant-templated approaches, sonochemical method can avoid the collapse of the framework of nanoporous materials and the pollution arising from the removal of surfactant templates.Subjects--Topical Terms:

560527
Chemistry, Physical.

Sonochemical preparation and characterization of nanoporous transition metal oxides for environmental catalysis.
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008 130614s2003 eng d
035 $a (UnM)AAI3104894
035 $a AAI3104894
040 $a UnM $c UnM
100 1 $a Zhang, Lizhi. $3 1951956
245 1 0 $a Sonochemical preparation and characterization of nanoporous transition metal oxides for environmental catalysis.
300 $a 120 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4381.
500 $a Adviser: Jimmy C. Yu.
502 $a Thesis (Ph.D.)--Chinese University of Hong Kong (People's Republic of China), 2003.
520 $a A series of single and multi-component nanoporous transition metal oxides were prepared by sonochemical processing. This is based on a new idea that the controlled condensation and agglomeration of monodispersed sol particles would form a nanoporous structure with a narrow pore size distribution under ultrasound irradiation. Therefore, nanoporous transition metal oxides may be obtained without using surfactant templates. X-ray diffraction (XRD), nitrogen adsorption, UV-vis diffuse reflectance spectrometry, transmission electron microscopy (TEM), infrared (IR) spectrometry, thermalgravimetric analysis (TGA) and differential thermal analysis (DTA) were used to characterize the resulting materials. Compared with conventional surfactant-templated approaches, sonochemical method can avoid the collapse of the framework of nanoporous materials and the pollution arising from the removal of surfactant templates.
520 $a The first part of the thesis describes the preparation of thermally stable mesoporous TiO2 under high intensity ultrasound irradiation. The photocatalytic activities of the resulting mesoporous TiO2 materials were evaluated by the degradation of volatile organic compounds. These sonochemically prepared mesoporous TiO2 showed better activities than the commercial photocatalyst P25. The reasons of the high activities of the mesoporous TiO 2 were discussed based on the characterization results in the thesis.
520 $a Nanoporous ceria-zirconia solid solutions with high surface area were also prepared. It was found that the sonochemically prepared solid solutions possessed higher thermal stability than that synthesized by other conventional methods. XPS analysis showed that the molar ratios of Ce to Zr in solid solutions were quite close to that in the starting solutions. This study also confirmed that the addition of zirconia to ceria could enhance the thermal resistance of ceria.
520 $a Nanoporous composites of amorphous titanium oxide and size-tunable strontium titanate nanocrystals were obtained through simply varying volume ratio of ethanol and water in reaction system. A dissolution-crystallization mechanism could be used to explain the formation of nanoporous composites under ultrasound irradiation.
590 $a School code: 1307.
650 4 $a Chemistry, Physical. $3 560527
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0494
690 $a 0794
710 2 0 $a Chinese University of Hong Kong (People's Republic of China). $3 1249360
773 0 $t Dissertation Abstracts International $g 64-09B.
790 1 0 $a Yu, Jimmy C., $e advisor
790 $a 1307
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3104894