Open AccessPhotoisomerization of n-pentane over nano ZnO/MoO3-ZrO2
Author(s) -
S. Triwahyono,
Aishah Abdul Jalil,
Che Rozid Mamat
Publication year - 2014
Publication title -
malaysian journal of fundamental and applied sciences
Language(s) - English
Resource type - Journals
ISSN - 2289-599X
DOI - 10.11113/mjfas.v10n4.320
Subject(s) - photoisomerization , catalysis , pentane , hydrogen , chemistry , adsorption , fourier transform infrared spectroscopy , lewis acids and bases , nuclear chemistry , inorganic chemistry , isomerization , chemical engineering , organic chemistry , engineering
A series of nano ZnO/MoO 3 -ZrO 2 catalysts with different ZnO loading (1.0, 2.5, 5.0 wt%) were prepared by impregnation method for n -pentane photoisomerization under hydrogen or nitrogen atmosphere. The properties of the catalysts were characterized with X-ray Diffraction (XRD), Brunauer Emmett Teller (BET), Transmission Electron microscope (TEM) and FTIR. The XRD result showed that the fraction of tetragonal phase of ZnO/MoO 3 -ZrO 2 was about 0.67 for all samples. While, the specific BET surface area was about 24 m 2 /g. Pyridine adsorbed FTIR results showed that all samples possessed high concentration of strong Lewis acid sites and small concentration of weak Bronsted acid sites. The interaction of hydrogen and surface samples at 298-523 K formed protonic acid sites with the concomitant of the partial elimination of Lewis acid sites. Whereas no changes of the concentration of acid sites were observed in the presence of nitrogen atmosphere. The activity of all samples in the n-pentane photoisomerization was strongly determined by the presence of hydrogen gas. In fact no activity was observed in the absence of hydrogen GRAPHICAL ABSTRACT
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