Adsorptive desulfurization of low sulfur diesel fuel using palladium containing mesoporous silica synthesized via a novel in-situ approach (original) (raw)

Fuel Processing Technology, 2013

Abstract

ABSTRACT In this work, a novel in-situ synthesis route was applied for preparation of an adsorbent, i.e. palladium containing MCM-41. At fi rst, a hydrophobic palladium precursor was added to the ethanolic micellar solution followed by vac- uum distillation of ethanol which decreases the hydrophobic characteristic of the solution. Distillation caused diffu- sion of hydrophobic palladium precursor into the hydrophobic core of the micelles. Then, tetraethyl orthosilicate was added to the above solution and the silicate spices arranged around the palladium containing micelles. The XRD, N 2 physisorption and TEM studies revealed that 4 wt.% palladium loading was achieved without considerable loss of pore ordering. H 2 -TPR showed that the palladium nanoparticles were accessible for hydrogen molecules. Ad- sorptive desulfurization of low sulfur diesel fuel was then investigated using synthesized samples. The effect of three valuable parameters, i.e., temperature (25, 75, 150 and 200 °C), concentration of palladium (2, 4 and 5 wt.%) and feed fl ow rate (0.3 and 1 mL/min) were tested using a fi xed-bed fl owing device. The highest sulfur break through adsorption capacity and total sulfur adsorption capacity obtained at 200 °C, 0.3 mL/min of feed fl ow rate and 4 wt.% of palladium concentration were 1.67 and 2.35 mg sulfur/g adsorbent, respectively.

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