Structure–Activity Relationships of AMn2O4 (A = Cu and Co) Spinels in Selective Catalytic Reduction of NOx: Experimental and Theoretical Study

详细信息    查看全文

• 作者：Xiuyun Wang ; Zhixin Lan ; Kai Zhang ; Jianjun Chen ; Lilong JiangRuihu Wang
• 刊名：Journal of Physical Chemistry C
• 出版年：2017
• 出版时间：February 16, 2017
• 年：2017
• 卷：121
• 期：6
• 页码：3339-3349
• 全文大小：772K
• ISSN：1932-7455

文摘

CuMn₂O₄ and CoMn₂O₄ spinels were facilely synthesized by oxidation–precipitation and subsequent heat treatment at relatively low temperature. Selective catalytic reduction (SCR) of NO_x demonstrates that NO_x conversions in CuMn₂O₄ with (111) plane (CuMn₂O₄-C) and in CuMn₂O₄-C with (311) plane (CuMn₂O₄-T) are more than 90% at 200 and 300 °C, respectively, which are superior to those in CoMn₂O₄-C and CoMn₂O₄-T. CuMn₂O₄-C and CoMn₂O₄-C exhibit higher absorption amounts of NH₃/NO and more oxygen vacancies than CuMn₂O₄-T and CoMn₂O₄-T, respectively. In addition, CuMn₂O₄-C displays high catalytic activity and good stability in NH₃-SCR in the presence of 100 ppm of SO₂ and 10 vol % H₂O. In situ diffuse reflection infrared Fourier transform spectroscopy results indicate the coexistence of Eley–Rideal and Langmuir–Hinshelwood mechanisms in CuMn₂O₄-C, and the Eley–Rideal mechanism is predominant.