Morphology-Sensitive Sulfation Effect on Ceria Catalysts for NH 3 -SCR
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ORIGINAL PAPER
Morphology‑Sensitive Sulfation Effect on Ceria Catalysts for NH3‑SCR Wei Tan1,2 · Jiaming Wang1 · Shuohan Yu1 · Annai Liu1 · Lulu Li1 · Kai Guo1 · Yidan Luo1 · Shaohua Xie2 · Fei Gao1 · Fudong Liu2 · Lin Dong1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this work, sulfation effect on N H3-SCR performance over C eO2 with different morphology (nanocubes and nanorods) was carefully studied. A morphology-sensitive sulfation effect on N H3-SCR activity was observed on C eO2. Interestingly, the NO removal efficiencies of CeO2 nanocubes and CeO2 nanorods got greatly enhanced after the sulfation at low-temperature range ( 350 °C). A series of characterizations such as N 2 adsorption–desorption, XRD, HR-TEM, TG–DTA, Raman and in situ DRIFTS of SO2 + O2 adsorption were conducted to investigate the interactions between SO2 and nano-shaped CeO2. It was revealed that the morphology of C eO2 nanorods was damaged severely when sulfated at high temperature (> 350 °C), while the structure of CeO2 nanocubes was relatively stable under the same condition. Furthermore, more sulfate species were found on CeO2 nanorods than on C eO2 nanocubes, in particular of bulk like sulfate species. As a result, the NO removal efficiency of C eO2 nanorods declined greatly when sulfated at high temperature. Keywords Gas-phase sulfation · CeO2 nanocubes · CeO2 nanorods · Deactivation
1 1. Introduction NOx in the atmosphere has caused severe environmental pollution problems and threatened human health. In decades, great efforts have been devoted to reducing or eliminating NOx emission. Among various N Ox elimination techniques, selective catalytic reduction of NO by ammonia (NH3-SCR) has been proved to be one of the most effective techniques Wei Tan and Jiaming Wang contributed equally. * Fei Gao [email protected] * Fudong Liu [email protected] 1
Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Vehicle Emissions Control, School of Environment, Center of Modern Analysis, Nanjing University, Nanjing 210093, People’s Republic of China
Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL 32816, USA
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due to the high efficiency. Recently, great concern was focused on traditional SCR catalyst, V2O5/TiO2 modified with WO3/MoO3, due to the strong biological toxicity of vanadium. Therefore, the development of environmentalfriendly NH3-SCR catalysts has aroused extensive attention [1–4]. It has been generally accepted that the redox capacity and acidity determine the activity of NH3-SCR catalysts [5]. For years, ceria-base materials have been widely used as an irreplaceable component or promoter in various catalysts for air pollution emission control, due to its outstanding redox capacity [6–8]. To improve the acidity of pur
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