The poisoning effect of PbO on Mn-Ce/TiO2 catalyst for selective catalytic reduction of NO with NH3 at low temperature
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- 作者：Lingling Zhoua ; b ; Caiting Lia ; b ; ctli@hnu.edu.cn" class="auth_mail" title="E-mail the corresponding author ; ctli3@yahoo.com" class="auth_mail" title="E-mail the corresponding author ; Lingkui Zhaoa ; b ; Guangming Zenga ; b ; Lei Gaoa ; b ; Yan Wanga ; b ; Ming&rsquo ; e Yua ; b
- 关键词：Low temperature SCR ; Mn-Ce/TiO2 ; PbO doping ; Deactivation ; Catalytic activity
- 刊名：Applied Surface Science
- 出版年：2016
- 出版时间：15 December 2016
- 年：2016
- 卷：389
- 期：Complete
- 页码：532-539
- 全文大小：2067 K
文摘
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The poisoning effects of PbO-doped Mn-Ce/TiO2 catalysts for low temperature NH3-SCR were investigated.
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Low concentration of Mn4+ and chemisorbed oxygen (Ob) were not favorable for the generation of intermediates.
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The decreased Ce3+ and less reducible of manganese oxides hindered the redox cycle (Mn3+ + Ce4+ ↔ Mn4+ + Ce3+).
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The doping of PbO not only altered acid sites but also inhibited ammonia adsorption as well as activation.
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The poisoning of PbO resulted in the decrease of ad-NOx species (only a spot of bidentate nitrates remained).