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The selective adsorption/reaction of methanol over nanosize uranium oxide crystallites dispersed in MCM-48: FT-IR and TPD studies by Dharmesh Kumar; S. Varma; V.S. Kamble; N.M. Gupta is a Chemistry article available to read on EtoBox.

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The techniques of in situ Fourier-transform infrared spectroscopy (FT-IR) and temperature-programmed desorption (TPD) were employed to discriminate between the surface species formed over U 3 O 8 /MCM-48, bulk U 3 O 8 and MCM-48 during the interaction of methanol at different temperatures. The U 3 O 8 /MCM-48 was found to exhibit a different behavior, as compared to the other two catalysts. Thus, methanol reacted over U 3 O 8 /MCM-48 to form methoxide, oxymethylene, polyoxymethylene (POM) and formate complex type species over catalyst surface. These species gave rise to formation of formic acid, formaldehyde, CO, CO 2 , H 2 and methane at elevated temperatures, as revealed by TPD coupled with QMS and FT-IR results. The room temperature adsorption of CH 3 OH over MCM-48, on other hand, resulted mainly in the development of methoxide species. Small amounts of dimethyl ether, CO and CO 2 were the main reaction products formed during subsequent thermal activation, the yields depending upon temperature. Furthermore, a negligibly small amount of methanol was adsorbed over bulk U 3 O 8 during room temperature adsorption and no methoxy groups were formed in the process, surface formate and

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Author

Dharmesh Kumar; S. Varma; V.S. Kamble; N.M. Gupta

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1381-1169)

Published

2004

Language

EN

Field

Chemistry (Physical Sciences)