Nature of SO3 poisoning on Cu/SAPO-34 SCR catalysts

Nature of SO3 poisoning on Cu/SAPO-34 SCR catalysts
复制标题

Cu/SAPO-34 SCR 催化剂 SO3 中毒的性质

DOI:
10.1016/j.jcat.2017.12.008
复制
发表时间:
2018-02
影响因子:
7.3
通讯作者:
Wang Jun
Wang Jun
中科院分区:
化学1区
文献类型:
--
作者:
Shen Meiqing;Zhang Yun;Wang Jianqiang;Wang Chen;Wang Jun

文献摘要

参考文献

被引文献

相似文献

为了揭示Cu/SAPO-34选择性催化还原(SCR)催化剂SO 3中毒的本质,对CHA结构、铜物种和NOx转化率进行了研究。Cu/SAPO-34催化剂在250 °C下用不同比例的SO 3/SOx(0、6、13和20%)处理。在硫酸化过程中,Sisingle键O(H)单键Al键发生断裂,生成硫酸铝。随着SO_3/SOx比值的增加,Cu ~(2+)向硫酸铜的转化率增加。被SOx毒化的催化剂在150-300 °C下显示出较低的NOx转化率,其原因是孤立的Cu 2+位点的数量减少,因为它们的转换频率(TOF)相同。在300 °C以上,孤立的Cu ~(2+)和Sisingle键O(H)单键Al键的丢失是导致活性降低的原因。在SCR上游应用柴油氧化催化剂时,由于SO 3与Cu/SAPO-34发生不可逆反应,SO 3的存在不容忽视。
To reveal the nature of SO3poisoning of Cu/SAPO-34 selective catalytic reduction (SCR) catalysts, CHA structure, copper species, and NOxconversion were probed. The Cu/SAPO-34 catalyst was treated with different ratios of SO3to SOx(0, 6, 13, and 20%) at 250 °C. The breakage of Sisingle bondO(H)single bondAl bonds takes place and leads to aluminum sulfate formation upon SOxsulfation. More isolated Cu2+transform to copper sulfate with an increment of the SO3/SOxratio. Catalysts poisoned with SOxshow lower NOxconversion at 150–300 °C, the reason for which is a reduced number of isolated Cu2+sites, as their turnover frequencies (TOFs) are identical. The loss of isolated Cu2+and Sisingle bondO(H)single bondAl bonds is responsible for the inferior activity above 300 °C. The presence of SO3cannot be ignored because of the irreversible reaction with Cu/SAPO-34 when diesel oxidation catalysts are applied upstream of the SCR.
DOI: 10.1021/ie00057a008
发表时间: 1991-09
影响因子: 4.2
作者:
B. Kartheuser;B. K. Hodnett;A. Riva;G. Centi;H. Matralis;M. Ruwet;P. Grange;N. Passarini
通讯作者: B. Kartheuser;B. K. Hodnett;A. Riva;G. Centi;H. Matralis;M. Ruwet;P. Grange;N. Passarini
DOI: 10.1016/j.cattod.2010.01.013
发表时间: 2010-06-19
期刊: CATALYSIS TODAY
影响因子: 5.3
作者:
Cheng, Yisun;Lambert, Christine;Peden, Charles H. F.
通讯作者: Peden, Charles H. F.
DOI: 10.1021/j100589a009
发表时间: 1975
期刊: The Journal of Physical Chemistry
影响因子: --
作者:
R. Herman;J. Lunsford;H. Beyer;P. Jacobs;J. Uytterhoeven
通讯作者: R. Herman;J. Lunsford;H. Beyer;P. Jacobs;J. Uytterhoeven
DOI: 10.1021/j100020a060
发表时间: 1995-05-18
影响因子: --
作者:
BRIEND, M;VOMSCHEID, R;BARTHOMEUF, D
通讯作者: BARTHOMEUF, D
DOI: 10.1016/j.jcat.2015.01.011
发表时间: 2013-06
影响因子: 7.3
作者:
Lei Wang;Wei Li;S. J. Schmieg;D. Weng
通讯作者: Lei Wang;Wei Li;S. J. Schmieg;D. Weng