Preparation by co-precipitation of Ce–Mn based catalysts for combustion of n-hexane. (October 2015)

• Record Type: Journal Article
• Authors: Picasso, Gino; Cruz, Rómulo; Sun Kou, María del Rosario
• Is Part Of: Materials research bulletin. Volume 70(2015:Oct.)
• Page Start: 621
• Page End: 632
• Publication Date: 2015-10
• Subjects: Oxides -- Chemical synthesis -- X-ray diffraction -- Photoelectron spectroscopy -- Catalytic properties; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2015.05.039
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: Preparation of samples by co-precipitation is shown in low saturation regime. Catalysts removed n -hexane at lower temperatures than similar reported data. Catalysts based on Ce–Mn presented good thermal stability and selectivity. Abstract: Catalysts for combustion of Mn mixed oxides with different Ce/Mn molar ratios ranging from 0.5 to 2, have been prepared by co-precipitation at constant pH with aging times of 4, 18 and 24 h. XRD patterns of the mixed oxides showed the dominant presence of fluorite-like phase. The surface area of mixed oxides was always higher than their single oxide counterparts and their adsorption isotherm corresponding to type IV depicted a mesoporous surface. TPR profiles of mixed oxides shifted to lower temperatures with increasing content of Ce, revealing a strong metal interaction in composites. Ce–Mn samples exhibited higher activities than the corresponding simple oxides regardless of the aging time. Sample Ce0.67 Mn0.33 O2 with 24 h of aging time showed the highest performance probably due to the presence of defect sites promoted by the incorporation of MnO x species into CeO2 structure, its highest surface area and best reducibility.