期刊
APPLIED SURFACE SCIENCE
卷 355, 期 -, 页码 171-182出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2015.07.129
关键词
RHA; Sulfur; Adsorption; Thiophene; Kinetics; Niobium pentoxide
Adsorbents based in rice husk ash (RHA) modified with niobium pentoxide were prepared for impregnation methods and applied in sulfur removal in liquid fuels. The solids were characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy, nitrogen physisorption and thermal analysis; they show that there was no qualitative change in the amorphous structure of the RHA; however, the method of impregnation could modify the particle size and topology of RHA particles. The larger sulfur removal (>50%) was achieved using RHA with 5 wt.% Nb2O5 at a dosage of 10 g L-1, after 4 h of contact with the model fuel. The kinetic study of adsorption of thiophene showed that the models of pseudo-second order and intra-particle diffusion best fit the experimental data. The adsorption experiments with the thiophenic derivatives compounds show a large selectivity of the adsorbent. (C) 2015 Elsevier B.V. All rights reserved.
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