Influence of supports structure on the activity and adsorption behavior of copper-based catalysts for NO reduction
Influence of supports structure on the activity and adsorption behavior of copper-based catalysts for NO reduction
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载体结构对铜基NO还原催化剂活性和吸附行为的影响
DOI：
10.1016/j.molcata.2010.05.002
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发表时间：
2010-07
影响因子：
--
通讯作者：
Chen, Yi
中科院分区：
文献类型：
--
作者：
Liu, Lianjun;Cai, Jinge;Qi, Lei;Yu, Qiang;Sun, Keqin;Liu, Bin;Gao, Fei;Dong, Lin;Chen, Yi
采用BET、XRD、拉曼、HRTEM、H2-TPR、原位FT-IR和NO+CO模型反应等手段，比较研究了载体（γ-Al 2 O3、t-ZrO 2、CeO 2和Ce0.67Zr0.33O2）对铜基催化剂活性和吸附行为的影响。结果表明，Cu在CeO 2（111）表面为不稳定的五配位结构，在t-ZrO 2表面为拉长环境，而在γ-Al 2 O3表面为对称稳定的八面体配位结构.这些差异自然影响了铜与载体之间的协同作用，从而使CuO/CeO 2催化剂表现出更高的还原效率和还原时间。原位FT-IR结果表明，与CuO/t-ZrO 2和CuO/γ-Al 2 O 3上的NO吸附物种相比，富铈相催化剂上的螯合硝基、双齿和单齿硝酸盐具有更强的脱附或转化活性，且在100°C以上的温度下，由于氧空位的形成，其表面还存在次硝酸盐。NO+CO的协同作用结果表明，NOx物种的吸附类型和反应性依赖于载体的结构和温度。CuO/CeO 2表面的螯合硝基、双齿和桥硝酸盐由于其优越的上级氧化还原活性，是低温下与CO反应的活性中间体。
The influence of supports (γ-Al2O3, t-ZrO2, CeO2and Ce0.67Zr0.33O2) on the activity and adsorption behavior of copper-based catalysts was comparatively studied by BET, XRD, Raman, HRTEM, H2-TPR, in situ FT-IR and NO+CO model reaction. It was suggested that the incorporated copper species on ceria (111) surface were in an unstable five-coordination structure, and on t-ZrO2were in the elongated environment, whereas on γ-Al2O3were in a symmetrical and stable octahedral coordination. These dissimilarities naturally influenced the synergistic interaction between copper and supports, thus CuO/CeO2catalyst showed the higher reducibility and TOF for NO reduction. In situ FT-IR of NO adsorption/desorption results revealed that compared with those adsorbed species on CuO/t-ZrO2and CuO/γ-Al2O3, the chelating nitro, bidentate and monodentate nitrates over the ceria-rich phase catalysts were more active to desorb or transform, and hyponitrites were also identified on its surface above 100°C due to the formation of oxygen vacancy. Co-interaction of NO+CO results suggested that the adsorption type and reactivity of NOxspecies were dependent on the supports structure and temperature. The chelating nitro, bidentate and bridge nitrates over CuO/CeO2surface were more active intermediates to react with CO at low temperatures due to its superior redox activity.
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Cu/CeO2 和 Cu/MgO-CeO2 催化剂 CO 还原 NO 的表征和催化性能
DOI：
10.1016/j.apcata.2009.05.017
发表时间：
2009-07
期刊：
Applied Catalysis A: General
影响因子：
--
作者：
Zhu, Junjiang;Zhan, Yingying;Wei, Kemei;Zheng, Qi;Cai, Guohui;Chen, Jinfa;Lin, Xingyi
通讯作者：
Lin, Xingyi
影响因子：
3.7
作者：
M. Yashima
通讯作者：
M. Yashima
影响因子：
5.3
作者：
Xiaolan Tang;Baocai Zhang;Yong Li;Yide Xu;Q. Xin;Wenjie Shen
通讯作者：
Xiaolan Tang;Baocai Zhang;Yong Li;Yide Xu;Q. Xin;Wenjie Shen
影响因子：
22.1
作者：
Hai-ou Zhu;Jeong-Rang Kim;S. Ihm
通讯作者：
Hai-ou Zhu;Jeong-Rang Kim;S. Ihm
影响因子：
7.3
作者：
D. I. Kondarides;Tarik Chafik;X. Verykios
通讯作者：
D. I. Kondarides;Tarik Chafik;X. Verykios