Morphology-Controlled Synthesis of TiO 2 with Different Structural Units and Applied for the Selective Catalytic Reducti
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ORIGINAL ARTICLE
Morphology‑Controlled Synthesis of TiO2 with Different Structural Units and Applied for the Selective Catalytic Reduction of NOx with NH3 Jie Guo1,2 · Guodong Zhang2 · Zhicheng Tang2 · Jiyi Zhang1 Received: 4 July 2020 / Accepted: 15 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In our study, a series of sphere morphology of T iO2 supports owned the different structural units, including the flower-like sphere with thin-long nanorods (TiO2-75), nanosheets-assembled sphere with broad-short nanorods (TiO2-50) and particleassembled sphere (TiO2-30) which were synthesized with adjusting volume ratio of Titanium (IV) isopropoxide/acetic acid by solvothermal method. Subsequently, CeO2–WO3/TiO2 catalysts were prepared by simple impregnation methods and applied for selective catalytic reduction of N Ox with N H3. Notably, the T iO2 sphere morphology gradually varied from flower-like sphere to particle-assembled sphere with the increase volume ratio of Titanium (IV) isopropoxide/acetic acid. Meanwhile, the microscopic structural units of morphology for TiO2 support could be regularly controlled by adjusting volume ratio of Titanium (IV) isopropoxide/acetic acid. Among, the optimal flower-like sphere TiO2 morphology with thin-long nanorods had the best catalytic performance when the volume ratio was 1:75, which could be attributed to bigger pore structure and higher specific surface area supplying enough dispersion for active ingredient, adsorption of reactants and exposure of more active sites. Meanwhile, it could be found that the redox ability and abundant surface acidity of the CeO2–WO3/TiO2 catalyst played a critical role in catalytic activity via a series of characterizations. Keywords Flower-like sphere of T iO2 · Selective catalytic reduction · Solvothermal method · CeO2–WO3/TiO2
1 Introduction In recent years, atmospheric pollution and energy crisis arouse people great attention. Especially, nitrogen oxides (NOx) resulted in a series of environmental issues, including acid rain, ozone depletion, greenhouse effects, photochemical smog and so on [1–5]. Nowadays, the selective catalytic reduction of NO with ammonia (NH3-SCR) is used to eliminate N Ox as a promising effective technology [6–8]. * Zhicheng Tang [email protected] * Jiyi Zhang [email protected] 1
School of Petroleum and Chemical, Lanzhou University of Technology, Lanzhou 730050, China
State Key Laboratory for Oxo Synthesis and Selective Oxidation, National Engineering Research Center for Fine Petrochemical Intermediates, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, People’s Republic of China
2
Vanadium-based catalysts (V2O5–WO3 (MoO3)/TiO2) had been widely applied for commercial areas because of its high activity during high temperature, great selectivity and good resistance of S O2 [9, 10]. However, there were some disadvantages such as narrow activity temperature windows and the toxicity of vanadium species in
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