Role of the Mg/Al Atomic Ratio in Catalyst Support for NO_X Storage/Reduction

Abstract:

Abstract. Mg-Al-O catalyst support prepared by thermal decomposition of Mg/Al hydrotalcite precursors that obtained by coprecipitation method with different Mg/Al atomic ratios of 1.0, 2.0 and 3.0. The samples characterized by XRD and TG-DSC. The results show that the hydrotalcite performance have high crystallinity with the Mg/Al atomic ratio of 2:1 and 3:1; It can be clearly observed the diffraction peaks of MgO after calcined at 500°C, and shows highest crystallinity of MgO with Mg/Al atomic ratio of 3:1, but we can’t observed the diffraction peaks of Al₂O₃ because of high dispersity; TG-DSC analysis shows that hydrotalcite has chemical decomposed at 443°C, and the quality lossed 32.97%, this indicates it transform the most of hydrotalcite into MgO at this temperature.

• Periodical: Advanced Materials Research (Volume 833)
• Pages: 66-69
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.833.66
• Online since: November 2013
• Authors: Na Zhao*, Jin Hu, Wei Jun Zhang, Yu Tian Wang
• Keywords: Hydrotalcite, Mg-Al Atomic Ratio, NO_X Storage/Reduction

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