Abstract
In this work, MIL-101, a metal organic framework, has been synthesized and examined in the adsorptive denitrogenation process. Due to the importance of adsorption capacity and selectivity, the effects of synthesis parameters including metal type, reagent ratio, time and temperature on the MIL-101 performance were investigated by measuring quinoline (QUI) separation from iso-octane. The optimum conditions were determined using a Taguchi experimental design and the multi-response optimization (multivariate statistical) method. Based on the arithmetic mean of normalized QUI adsorption capacity and QUI/dibenzothiophene (DBT) selectivity, as the objective function, the optimum value of synthesis parameters were found to be manganese as metal type in the structure, 180 °C for synthesis temperature, 15 h for synthesis time and 1.00 for reagent molar ratio. Under these conditions, QUI adsorption capacity and QUI/DBT selectivity were 19.3 mg-N/g-Ads. and 24.6, respectively. Accordingly, the arithmetic mean between normalized values of these measured parameters was equal to 1.10, which is in good agreement with the predicted value. The MIL-101 produced under optimum conditions was characterized by determining its specific surface area, X-ray powder diffraction patterns and Fourier transform infrared spectroscopy. Finally, isotherm and kinetic studies indicate that the Langmuir isotherm and pseudo-first-order model can successfully describe the experimental data.
Highlights
Metal–organic frameworks (MOFs) are one of the fastest growing materials that have attracted much attention
The analysis of variance (ANOVA) was based on degree of freedom (DOF), sum of
For the synthesized adsorbent under optimum conditions, the experimental values of QUI adsorption capacity and QUI/DBT selectivity were obtained as 19.3 mg-N/g-Ads. and 24.6, respectively
Summary
Metal–organic frameworks (MOFs) are one of the fastest growing materials that have attracted much attention. These materials have interested researchers as their properties such as pore size and shape, Edited by Xiu-Qiu Peng. Petrochemical Research and Technology Company, National Petrochemical Company, Tehran, Iran surface area and special physicochemical surface properties can be regulated and modified by altering the connectivity of organic–inorganic moieties (Hu et al 2018). Adsorptive denitrogenation (ADN) is one of the crucial technologies that are highly environmentally friendly and do not need any hydrogen usage for removing NCCs from fuel. Adsorption of NCCs from fuel is a promising process in which MOFs can be successfully utilized (Sentorun-Shalaby et al 2013). Several MOFs have been used for ADN, among which MIL-101 had notable adsorption capacity and selectivity, for removing NCCs from fossil fuels
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