Improved performance of Mn ion substituted Ceria nanospheres for water gas shift reaction: Influence of preparation conditions

• Published in: Materials research bulletin Vol. 103; pp. 309 - 318
• Main Authors: Bhairi, Lakshminarayana, Sarker, Surajit, Ch, Subrahmanyam
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2018
• Subjects: Ce0.8Mn0.2O2-δ; CO oxidation; Different synthetic methods and calcination temperature; Physicochemical characterization; Water gas shift reaction (WGS); Physicochemical characterization; Water gas shift reaction (WGS); Different synthetic methods and calcination temperature; CO oxidation; Ce0.8Mn0.2O2-δ
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2018.03.037

The present study reports the development of noble metal free nano-catalysts for low-temperature CO oxidation and Water gas shift reaction. Mn-substituted CeO2 solid solution catalysts were synthesized by co-precipitation, combustion and hydrothermal methods and characterized by various physico-chemical techniques. [Display omitted] •The Ce0.8Mn0.2O2-δ was prepared via co-precipitation, hydrothermal, combustion methods with various calcined temperatures•As prepared materials, physical characterization comparative studies have been done in this context.•Comparative studies of CO oxidation and water gas shift reaction have done using as-prepared Ce0.8Mn0.2O2-δ materials•Among all the materials, Ce0.8Mn0.2O2-δ prepared by co-precipitation method at 400 °C calcined temperature showed better activity. The present study reports the development of noble metal free nano-catalysts for low-temperature CO oxidation and Water gas shift reaction. Mn-substituted CeO2 solid solution catalysts were synthesized by co-precipitation, combustion and hydrothermal methods and characterized by various physicochemical techniques. The formation of the solid solution was confirmed by XRD. Raman spectroscopic confirmed the oxygen vacancies. The surface area, pore volume and pore size distribution confirmed by N2 physisorption analysis, whereas, XPS, UV–vis diffuse reflectance spectroscopy confirmed the oxidation state of the Mn ion. The particle size and morphology (spherical shape) of the material was confirmed using FESEM and HRTEM analysis. The resultant Ce1-xMnxO2-δ catalysts were subjected to CO oxidation and influence of various parameters was examined. Typical results indicated that the co-precipitation favored the best active catalyst.