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Abstract
In this work, single-crystalline large-scale LaCO3OH nanoprism morphologies were synthesized by controlling La and Ca molar ratio and the hydrothermal reaction conditions. The nanoprism morphologies of LaCO3OH were unique in nature with a sharp corner and smooth surfaces. The hydrothermal reaction was carried out in the absence of organic additives or templates and (NH4)2CO3 was used as a precipitation agent. The molar ratio of La:Ca was varied over the following values (the sample shorthand is given in parentheses): 75:25 mol% (LC-1), 50:50 mol% (LC-2), and 25:75 mol% (LC-3). Phase-pure LaCO3OH nanoprisms formed at a La:Ca molar ratio of 75:25 mol% without any assistance of catalysts or template. The photoluminescence (PL) properties of the as-synthesized powders showed one broad emission band centered at 394 nm after excitation of the pure LC-3 LaCO3OH nanoprisms at λ = 280 nm. The PL intensities were decreased in the order of LC-1 < LC-2< LC-3. The LC-1 and LC-2 samples had almost the same PL intensities probably due to their unique and smooth particle morphology. The calcination result of three samples treated for two hours at 800 °C, shows a reduction in NO activities over highly distributed CaO comprising La2O3. Further, under the presence of H2O and O2 vapor, CaO comprising La2O3 catalysts shows higher stability for the reduction of NO with CH4.
Highlights
Significant efforts have been applied toward synthesizing nanomaterials with well-defined sizes and shapes using novel synthetic methodologies
No irregular nanoparticles were observed in the integrated nanoprism microstructure
This new synthesis route represents a novel and general approach to the synthesis of rare-earth compounds with a variety of morphologies and properties
Summary
Significant efforts have been applied toward synthesizing nanomaterials with well-defined sizes and shapes using novel synthetic methodologies. Xiaoyang et al synthesized LaCO3 OH via an ethylenediaminetetraacetic acid-assisted hydrothermal method to form double-deck-like microhexagrams They fabricated a diversity of morphologies, including microspheres, apple-like nanostructures, nanowires, spiky balls, layer-by-layer self-assembled nanoplates, and triangular hearts [11]. LaCO3 OH hierarchical nanostructures with a uniform apple-like morphology have been prepared using a hydrothermal method involving a gelatin starting material in conjunction with a structure-directing agent [14]. LaCO3 OH with phase-pure hydrocarbonates structure had scarcely studied in the open literature This was due to difficulty in synthesizing LaCO3 OH with organic additives and templates that arises due to the complicate reaction mechanism, undesirable by-products, and higher production costs. Under the presence of H2 O vapor and oxygen, the reduction pattern of NO was analyzed by using hydrocarbons
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