Multi-response optimization of MIL-101 synthesis for selectively adsorbing N-compounds from fuels

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 multiresponse 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.

Silicatos lamelares modificados e funcionalizados com polietilenimina

“…Para 10CTA-MAG, os valores calculados são de 4,20 mmol g -1 de C e 0,22 mmol g -1 de N, estando em concordância com os resultados apresentados na Tabela 1. Em 25CTA-MAG, os valores calculados são de 10,53 mmol g -1 de C e 0,55 mmol g -1 de N, apesar dos valores experimentais estarem abaixo do esperado, a razão C/N para a cadeia de CTA + é aproximadamente 19 Nas amostras modificadas, observam-se eventos de perda de massa por volta de 122°C, 248°C, 394°C, com perdas de massa de 11,18 % (a), 18,44 % (b), 20,00 % (c) e 20,50 % (d). Estes resultados corroboram os resultados obtidos através da análise elementar de CHN.…”