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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/2692
Title: Efficient ceria-zirconium oxide catalyst for carbon dioxide conversions: Characterization, catalytic activity and thermodynamic study
Authors: Kumar P.
With P.
Srivastava, Vimal Chandra
Gläser R.
Mishra I.M.
Published in: Journal of Alloys and Compounds
Abstract: In this study, ceria-zirconia based catalysts (CeO2, ZrO2and Ce0.5Zr0.5O2) were synthesized by hydrothermal method and characterized by N2-sorption, X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Acidity and basicity of synthesized catalysts were investigated by NH3[sbnd] and CO2[sbnd] temperature-programmed desorption (TPD). Brunauer-Emmett-Teller (BET) surface area of CeO2, Ce0.5Zr0.5O2and ZrO2were found to be 88, 117 and 70 m2 g?1and average crystallite sizes was 9.48, 7.09 and 9.45 nm, respectively. These catalysts were further used for direct conversion of CO2with methanol for the synthesis of dimethyl carbonate (DMC). DMC yield was found to be highly dependent upon the both basicity and acidity of catalysts. Ce0.5Zr0.5O2catalysts showed better activity as compared to CeO2and ZrO2catalysts. Effect of reaction conditions (such as catalyst dose, reaction temperature and reaction time) and catalyst reusability was studied with Ce0.5Zr0.5O2catalyst. The optimum operating condition for direct conversion of CO2into DMC at constant pressure of 150 bar were found to be reaction time = 24 h, catalyst dose = 1.25 g and temperature = 120 °C. Moreover, chemical equilibrium modeling was performed using Peng–Robinson–Stryjek–Vera equation of state (PRSV-EoS) along with the van der Waals one-fluid (1PVDW) mixing rule to calculate the heat of reaction and Gibbs free energy change. © 2016 Elsevier B.V.
Citation: Journal of Alloys and Compounds (2017), 696(): 718-726
URI: https://doi.org/10.1016/j.jallcom.2016.10.293
http://repository.iitr.ac.in/handle/123456789/2692
Issue Date: 2017
Publisher: Elsevier Ltd
Keywords: Ce0.5Zr0.5O2catalyst
Direct conversion of CO2
DMC
NH3- &amp
CO2-TPD
ISSN: 9258388
Author Scopus IDs: 57164203600
36159965000
35565811700
7202586559
23668474600
Author Affiliations: Kumar, P., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India, Institute of Chemical Technology, Universität Leipzig, Linnéstraße 3, Leipzig, 04103, Germany
With, P., Leibniz-Institutes für Oberflächenmodifizierung e. V. (IOM), Permoserstr. 15, Leipzig, D-04318, Germany
Srivastava, V.C., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Gläser, R., Institute of Chemical Technology, Universität Leipzig, Linnéstraße 3, Leipzig, 04103, Germany
Mishra, I.M., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India, Department of Chemical Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand 826004, India
Funding Details: One of the authors, namely Praveen Kumar, is thankful to Deutscher Akademischer Austausch Dienst (DAAD), Germany, for providing financial support to carry out this work under a Sandwich Model Scholarship. Appendix A
Corresponding Author: Kumar, P.; Department of Chemical Engineering, Indian Institute of Technology RoorkeeIndia; email: praveen.zon@gmail.com
Appears in Collections:Journal Publications [CH]

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