Ayesha A. Alkhoori , Aasif A. Dabbawala , Mark A. Baker , Samuel Mao , Nikolaos Charisiou , Steven S. Hinder , Messaoud Harfouche , Dalaver H. Anjum , Maria A. Goula , Kyriaki Polychronopoulou
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引用次数: 0
Abstract
In present study, halloysite (Hal) clay mineral was modified by promoters, such as ceria, Cu-doped and La-doped ceria. Comprehensive techniques were used to study the microstructure, the surface coordination environment, redox behavior and acid/base properties; the interaction between Ni0 nanoparticles and interfacial sites was unveiled. TEM demonstrates that the Hal layer modification promotes high dispersion of Ni0 nanoparticles with predominant Ni0 (111) facets. Particularly, Hal modification with Ce and La reduces Ni particles size (∼9 nm). XPS reveals the co-presence of CeIII and CeIV species on the surface, which plays a crucial role in facilitating the CO2 activation. Moreover, XAS studies provide insights into the structural properties and surface interactions at unit cell scale length. Ni/10La10CeHal catalyst exhibits higher oxidation resistance compared to Ni/Hal. In particular, the Ni/10La10CeHal catalyst exhibits the highest CO2 conversion (XCO2 = 67%) amongst the studied catalysts, with a YCH4 of approximately 61% and a SCH4 of 91% at 450°C. Whereas the catalyst's YCO and SCO are only ∼6% and ∼9%, respectively, at 450°C compared to both Ni/5Cu15CeHal and Ni/10Cu10CeHal. The Ni/10La10CeHal catalyst showed a steady catalytic performance over 50 h maintaining a XCO2 of 65% at 450°C, attributed to its extrinsic features.
期刊介绍:
Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as:
• Synthesis and purification
• Structural, crystallographic and mineralogical properties of clays and clay minerals
• Thermal properties of clays and clay minerals
• Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties
• Interaction with water, with polar and apolar molecules
• Colloidal properties and rheology
• Adsorption, Intercalation, Ionic exchange
• Genesis and deposits of clay minerals
• Geology and geochemistry of clays
• Modification of clays and clay minerals properties by thermal and physical treatments
• Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays)
• Modification by biological microorganisms. etc...