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Niobium mixed oxides catalyst for environment remediation

Embong, Zaidi and Yarmo, Ambar and Taufiq, Yap Yun Hin and Agam, Mohd. Arif and Chulan, Megat Azahari (2012) Niobium mixed oxides catalyst for environment remediation. Other thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

This project is devoted to be mixed oxide niobium catalyst in environmental remediation purposes. Niobium oxides and mixed oxides as well as sulfides, nitrides (oxynitrides), carbides (oxycarbides), and phosphates are considered. Among the catalyyic processes, Nb-containing materials were tested under ambient and corrosive environment. The role of niobium porous in absorbing the sulphite and nitride component was also investigated. The surface chemical composition of Nb samples prepared by following procedures commonly employed in the sample preparation using X-ray Photoelectron (XPS) and Angle Resolved X-ray Photoelectron (ARXPS). The series of ambient and corrosive exposure analysis was performed in order to monitor the development of oxide on the sample surfaces as it reacts with the oxygen, sulfur dioxide and nitrogen dioxide. During the exposure phase, it was found that there is a progressive reduction of Nb oxides from NbO, NbO2 and finally Nb2O2. The O photoelectron signal exhibit that a wide and broad photoelectron formation and shifting towards the higher binding energy region. The existence of weak photoelectron signal from sulphite and nitride indicated that this species is sticking on the surface of the exposure samples. This can be interpreted as due to O diffusion in the Nb matrix, there is a formation of mixed oxide species on the niobium surface. The diffusion SO2 and NO is resulting to the elevation of sulfide and nitride deposition in the porous oxide of niobium.

Item Type: Thesis (Other)
Subjects: T Technology > T Technology (General)
Depositing User: Normajihan Abd. Rahman
Date Deposited: 14 Aug 2018 01:34
Last Modified: 14 Aug 2018 01:34
URI: http://eprints.uthm.edu.my/id/eprint/3847
Statistic Details: View Download Statistic

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