BaFeO3−x Perovskite: An Efficient NOx Absorber with a High Sulfur Tolerance

详细信息    查看全文

• 作者：Hui Xian ; Xingwen Zhang ; Xingang Li ; Lingyun Li ; Honghu Zou ; Ming Meng ; Qian Li ; Yisheng Tan ; Noritatsu Tsubaki
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：July 15, 2010
• 年：2010
• 卷：114
• 期：27
• 页码：11844-11852
• 全文大小：341K
• 年卷期：v.114,no.27(July 15, 2010)
• ISSN：1932-7455

文摘

The noble metal free perovskite-type BaFeO_3−x catalyst has been synthesized by a sol−gel method containing a small amount of spinel and carbonate. NO_x is stored on both perovskite and carbonate, and the formed nitrate on the perovskite can be transferred to the neighboring carbonates to regenerate the storage sites on the perovskite. During the sulfation process, both perovskite and carbonate can be sulfated, and the sulfate species formed on the former one is more easily reduced. The poison of the perovskite catalyst is mainly due to the sulfation of the carbonate. The NO_x storage capacity of the sulfated BaFeO₃-950 catalyst, on which a trace amount of carbonate exists, drops only 14% comparing with the fresh catalyst. The iron atoms surrounding the barium atoms closely in the crystal lattice of the perovskite inhibit the sulfation of the barium, inducing a high sulfur tolerance.