Effect of Calcination Heating Rate on Microstructure and Performances of NSR Catalyst

Abstract:

The Be/Ce/γ-Al₂O₃ compound catalysts were prepared by sol-gel process using γ-Al₂O₃, Ba (AC)₂ and Ce (NO₃)₃·6H₂O as raw materials, and the effect of calcination heating rate on microstructure and performance of the NOx storage and reduction (NSR) catalyst was investigated. The crystal structure, microstructure, absorption and reduction performances of the NSR catalyst were characterized and analyzed by X-Ray diffractometer (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), Brunauer Emmett Teller (BET) and H₂ temperature program reduction (H₂-TPR). The experimental results show that the Ba and Ce elements mainly exist in the forms of BaCO₃ and CeO₂, respectively, and partial CeO₂ is amorphous. The calcination heating rate can play a key role in the grain size and distribution of BaCO₃ and CeO₂, so that it can affect the surface area, pore volume and pore diameter of the NSR catalyst. Moreover, the reduction temperature of the NSR catalyst decrease first and then increase with the increase of calcination heating rate, and the reduction temperature of as-received NSR catalyst is the lowest as the reduction temperature is 6 °C/min, that is its reduction performance is the optimal.

• Periodical: Materials Science Forum (Volume 893)
• Pages: 81-85
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.893.81
• Online since: March 2017
• Authors: Jing Li, Xiang Zhao Zhang*, Pan Wang, Gui Wu Liu, Hai Cheng Shao, Guan Jun Qiao
• Keywords: Calcination Heating Rate, NOx Reduction, NOx Storage, Reduction Performance, Sol-Gel

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