New insight into alkali resistance and low temperature activation on vanadia-titania catalysts for selective catalytic reduction of NO
New insight into alkali resistance and low temperature activation on vanadia-titania catalysts for selective catalytic reduction of NO
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氧化钒-二氧化钛催化剂选择性催化还原NO的耐碱性和低温活化的新见解
DOI：
10.1016/j.apsusc.2018.09.261
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发表时间：
2019-02
影响因子：
6.7
通讯作者：
Gao Xiang
中科院分区：
文献类型：
--
作者：
Zhang Shuo;Liu Shaojun;Hu Wenshuo;Zhu Xinbo;Qu Ruiyang;Wu Weihong;Zheng Chenghang;Gao Xiang
采用等体积浸渍法制备了一系列不同钒负载量的钒-钛催化剂，并用于氨选择性催化还原NO反应。考察了催化剂的抗碱性和低温SCR活性。在200 °C时，钒负载量从1%增加到10%时，催化剂的NO脱除效率提高了70%。随着V_2O_3负载量的增加，高负载量的V_2O_3-TiO_2催化剂表现出更高的V_5 +/（V_4 ++ V_5+）比值，这增强了高温下NH_3的氧化，同时也改善了低温下的SCR性能。掺杂钾后，V_4/Ti催化剂（V_2O_5 = 4wt%）表现出最好的催化性能，在300 ~ 400 ℃温度范围内，初始活性保持80%以上。高负载量的钒钛催化剂保留了较多的酸性中心和活性钒物种，使其具有较好的低温抗碱性。当钒含量大于4%时，在250 °C以上，NH3氧化竞争使催化剂活性严重失活。此外，还研究了在SO2和H2O存在下，高负载量钒钛催化剂的SCR性能，考察了实际工况对催化剂性能的影响。
A series of vanadia-titania catalysts with different vanadia loadings for the selective catalytic reduction (SCR) of NO by ammonia was prepared via incipient impregnation method. The alkali resistance and SCR activity at low temperature has been investigated on the prepared catalysts. Increasing the vanadia loading from 1% to 10%, the NO removal efficiency of the catalysts gained a 70% growth at 200 °C. With the increase of the vanadia loading, the high loading vanadia-titania catalysts exhibited higher ratio of V5+/(V4++V5+), which enhanced the oxidation of NH3at high temperatures and also improved the standard SCR performance at low temperature. After doping with potassium, V4/Ti catalyst (V2O5= 4 wt%) displayed the best performance over which 80% initial activity was retained from 300 °C to 400 °C. More acid sites and active vanadium species were retained in the high loading vanadia-titania catalysts, which made them exhibit better low temperature alkali resistance. However, when vanadia content was higher than 4%, the competition of NH3oxidation severely deactivated the catalytic activity above 250 °C. Additionally, in the presence of SO2and H2O the SCR performance of the high loading vanadia-titania catalysts were also studied in order to investigate the influence of the actual working conditions.
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影响因子：
7.3
作者：
Amiridis, MD;Wachs, IE;Kim, DS
通讯作者：
Kim, DS
一种环境友好型 CeO2-TiO2 催化剂，用于选择性催化还原模拟柴油机尾气中的 NH3 氮氧化物
影响因子：
5.3
作者：
Wenpo Shan;Fudong Liu;Hong He;Xiaoyan Shi;Changbin Zhang
通讯作者：
Changbin Zhang
影响因子：
22.1
作者：
Fushun Tang;Bolian Xu;Hai-Wei Shi;J. Qiu;Yining Fan
通讯作者：
Fushun Tang;Bolian Xu;Hai-Wei Shi;J. Qiu;Yining Fan
影响因子：
15.1
作者：
D. A. Bulushev;E. A. Ivanov;S. Reshetnikov;L. Kiwi-Minsker;A. Renken
通讯作者：
D. A. Bulushev;E. A. Ivanov;S. Reshetnikov;L. Kiwi-Minsker;A. Renken
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影响因子：
6.4
作者：
Guan, Bin;Zhan, Reggie;Huang, Zhen
通讯作者：
Huang, Zhen