Reliable prediction of n-heptane isomerization over Pt/(CrO x /ZrO2)-HMS via comparative assessment of regularization networks and surface response methodologies.

Novel Pt-Cr/Zr(x)-HMS catalysts with different molar ratios of Cr/Zr were synthesized. These catalysts were characterized by necessary techniques including XRD, XRF, NH3-TPD, FTIR, H2 chemisorption, nitrogen sorption and TGA. Moreover, generalization performances of an optimized in-house regularization network and an RSM were compared for the prediction of activity and selectivity versus various molar ratios, feed temperatures and time on stream. The results indicated that the incorporation of Cr promotes the catalyst activity, in which a high amount of 63% conversion was obtained at Cr/Zr = 30 and T = 200 °C. Increasing temperature has an adverse effect on i-C7 and mono plus multi-branch isomer selectivity nearly in all amounts of molar ratios. The best i-C7 selectivity (66%), MOB (29.6%) and MUB (32%) were observed at 200 °C and Cr/Zr = 30. Although both modeling methods exhibited outstanding performances, statistical analysis revealed that optimized RN has slightly better performances than RSM.

Correction: Reliable prediction of n-heptane isomerization over Pt/(CrO x /ZrO2)-HMS via comparative assessment of regularization networks and surface response methodologies.

[This corrects the article DOI: 10.1039/D0RA04313C.].

Dye removal from aqueous solution by a novel dual cross-linked biocomposite obtained from mucilage of Plantago Psyllium and eggshell membrane.

In this study, a novel dual cross-linked biocomposite of Plantago Psyllium mucilage, eggshell membrane, and alginate was prepared and used for removal of cationic methylene blue and anionic methyl orange dyes from aqueous solution. The fabricated biocomposite was characterized by FeSEM, EDX, XRD, TGA, BET, and FTIR analyses. Parameters such as kinetics, isotherm, thermodynamics, regeneration, swelling, and the influence of contact time, dye concentration, adsorbent amount, and pH on the dye adsorption capacity were determined. The maximum adsorption capacities of biocomposite were obtained for 0.05 g of the adsorbent with an initial concentration of 10 ppm in pH equal to 11 and 3, about 5.45 and 3.25 mg/g for methylene blue and anionic methyl orange, respectively. The thermodynamic results showed that the adsorption of the dye processes are a spontaneous exothermic process. The results showed that the adsorption of the dyes follows the pseudo-second-order kinetic model and the isotherm of both the dyes fit the Freundlich model. The experimental breakthrough curves were analyzed using different dynamic models of Bohart-Adams, Thomas, and Yoon-Nelson. The continuous adsorption process of dyes by the synthesized adsorbent was shown an appropriate consistency with the dynamic models, and best fitted to the Thomas and Yoon-Nelson models.