Synergistic effects of second metals on performance of (Co, Ag, Cu)-doped Pd/Al2O3 catalysts for 2-ethyl-anthraquinone hydrogenation
Synergistic effects of second metals on performance of (Co, Ag, Cu)-doped Pd/Al2O3 catalysts for 2-ethyl-anthraquinone hydrogenation
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第二金属对(Co,Ag,Cu)掺杂Pd/Al2O3催化剂2-乙基蒽醌加氢性能的协同作用
DOI：
10.1016/j.jcat.2017.01.003
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发表时间：
2017-03
影响因子：
7.3
通讯作者：
Wang li
中科院分区：
文献类型：
--
作者：
Yuan enxian;Wu chan;Hou xu;Dou maobin;Liu guozhu;Li guozhu;Wang li
采用等体积浸渍法制备了Al_2O_3负载的单金属Pd、双金属Pd-Co、Pd-Ag、Pd-Cu催化剂，并对2-乙基蒽醌（EAQ）加氢反应进行了研究。还原温度和第二金属（M = Co，Ag，Cu）与Pd的质量比（M/Pd）对催化剂的催化性能有很大影响。在80 ℃的低温下还原的M/Pd = 0.25的Pd-Co催化剂上实现了最高的催化活性沿着的高选择性，与单金属Pd催化剂相比，反应速率增加了一个数量级。H2-TPR、CO吸附的FTIR、STEM-EDX和XPS表征结果证实了这一点，这可能是由于在较低还原温度下形成的Pd-Mα+结构的协同效应所致。EAQ加氢反应符合Langmuir-Hinshelwood（L-H）模型，该模型考虑了表面反应控制机理。结果表明，Pd-Co和Pd-Ag催化剂的表面反应速率常数显著提高，表明它们的上级活性是由于Pd-Mα+位比Pd位更容易活化EAQ的羰基键所致。
Hydrogenation of 2-ethyl-anthraquinone (EAQ) has been studied over Al2O3-supported monometallic Pd and bimetallic Pd-Co, Pd-Ag, and Pd-Cu catalysts prepared by incipient wetness co-impregnation method. The catalytic performance of the bimetallic catalysts could be greatly affected by the reduction temperature and mass ratio of the second metal (M = Co, Ag, Cu) to Pd (M/Pd). The highest catalytic activity, along with the high selectivity is achieved over Pd-Co catalysts having M/Pd = 0.25 reduced at a low temperature of 80 °C, with an increase in an order of magnitude in the reaction rate compared to the monometallic Pd catalyst. This could be ascribed to the synergistic effects of the Pd-Mα+structure formed at low reduction temperature, which is confirmed by the results of H2-TPR, FTIR of CO adsorbed, STEM-EDX and XPS characterizations. The experimental data were satisfactorily fitted to a Langmuir-Hinshelwood (L-H) model involving a surface reaction controlling mechanism for EAQ hydrogenation. The results revealed that the surface reaction rate constant remarkably increased over bimetallic Pd-Co and Pd-Ag catalysts, implying that their superior activity is due to the more facile activation of carbonyl bond of EAQ on Pd-Mα+sites than on Pd sites.
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影响因子：
7.3
作者：
He, Yufei;Liu, Yanan;Li, Dianqing
通讯作者：
Li, Dianqing
深入了解直接从 H2 和 O2 合成过氧化氢中 Pd-Au/TiO2 催化剂的活性位点
影响因子：
7.3
作者：
Ouyang, Like;Da, Guo-jin;Han, Yi-Fan
通讯作者：
Han, Yi-Fan
DOI：
10.1021/jp062205l
发表时间：
2006-08
期刊：
The journal of physical chemistry. B
影响因子：
--
作者：
Jacinto Sá;G. Arteaga;R. Daley;J. Bernardi;J. Anderson
通讯作者：
Jacinto Sá;G. Arteaga;R. Daley;J. Bernardi;J. Anderson
DOI：
10.1002/cphc.201600874
发表时间：
2016-12
期刊：
Chemphyschem : a European journal of chemical physics and physical chemistry
影响因子：
--
作者：
Enxian Yuan;Li Wang;Xiangwen Zhang;R. Feng;Chan Wu;Guozhu Li
通讯作者：
Enxian Yuan;Li Wang;Xiangwen Zhang;R. Feng;Chan Wu;Guozhu Li
影响因子：
3.3
作者：
Bertarione, S;Scarano, D;Freund, HJ
通讯作者：
Freund, HJ