Passive NO Adsorption on Hydrothermally Aged Pd-Based Small-Pore Zeolites
Passive NO Adsorption on Hydrothermally Aged Pd-Based Small-Pore Zeolites
复制标题
水热老化钯基小孔沸石上的被动吸附 NO
DOI：
10.1007/s11244-020-01352-6
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发表时间：
2020-08
影响因子：
3.6
通讯作者：
He Hong
中科院分区：
文献类型：
--
作者：
Shan Yulong;Sun Yu;Li Yaobin;Shi Xiaoyan;Shan Wenpo;Yu Yunbo;He Hong
采用等体积浸渍法合成了不同骨架结构的钯基小孔分子筛（AEI、CHA和RTH）。利用沸石作为低温被动NOx吸附剂（PNA）的NOx存储水热老化前后。结果表明，无论在750 ℃和800 ℃下进行水热老化，1wt%Pd/AEI的PNA性能均优于1wt%Pd/CHA和Pd/RTH。AEI分子筛具有三维曲折孔道结构，在750 ℃水热老化时，该孔道结构促进了Pd的分散，但在800 ℃水热老化时，该孔道结构抑制了Pd的聚集。Pd/CHA在750 ℃时Pd分散度略有增加，但在800 ℃时由于其平直无阻的三维孔结构，Pd大量聚集。由于Pd/RTH分子筛的二维孔结构，在水热老化过程中Pd物种容易积累。因此，Pd/AEI可用作经温和水热老化处理活化后的高效且稳定的PNA。
Pd-based small-pore zeolites with different framework structures (AEI, CHA and RTH) were synthesized by a facile incipient wetness impregnation method. The zeolites were utilized as low-temperature passive NOxadsorbers (PNA) for NOxstorage before and after hydrothermal aging. It was found that 1 wt% Pd/AEI showed better PNA behavior than the 1 wt% Pd/CHA and Pd/RTH samples, regardless of hydrothermal aging at 750 and 800 ℃. The AEI zeolite has a three-dimensional but tortuous pore channel structure, which accelerated Pd dispersion at 750 ℃ but inhibited Pd aggregation at 800 ℃ when subjected to hydrothermal aging. Pd/CHA showed a slight increase in Pd dispersion at 750 ℃, but extensive Pd aggregation at 800 ℃ due to its straight and unhindered three-dimensional pore structure. The Pd species in Pd/RTH zeolite were prone to accumulation during hydrothermal aging due to the two-dimensional pore structure. Therefore, Pd/AEI can be utilized as an efficient and stable PNA after activation by mild hydrothermal aging treatment.
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影响因子：
22.1
作者：
Ji, Yaying;Bai, Shuli;Crocker, Mark
通讯作者：
Crocker, Mark
影响因子：
22.1
作者：
Tao Zhang;F. Qiu;Junhua Li
通讯作者：
Tao Zhang;F. Qiu;Junhua Li
影响因子：
--
作者：
C. F. Freiherr Von Weizsäcker
通讯作者：
C. F. Freiherr Von Weizsäcker
影响因子：
22.1
作者：
Yaying Ji;Shuli Bai;Dongyan Xu;D. Qian;Zili Wu;Yang Song;Robby Pace;M. Crocker;K. Wilson;A. Lee;Deb Harris;D. Scapens
通讯作者：
Yaying Ji;Shuli Bai;Dongyan Xu;D. Qian;Zili Wu;Yang Song;Robby Pace;M. Crocker;K. Wilson;A. Lee;Deb Harris;D. Scapens
影响因子：
5.5
作者：
Khivantsev, Konstantin;Jaegers, Nicholas R.;Szanyi, Janos
通讯作者：
Szanyi, Janos