A comparative study of Pd/SiO2 and Pd/MCM-41 catalysts in liquid-phase hydrogenation
A comparative study of Pd/SiO2 and Pd/MCM-41 catalysts in liquid-phase hydrogenation
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DOI：
10.1016/j.catcom.2004.07.008
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发表时间：
2004-10
影响因子：
3.7
通讯作者：
J. Panpranot;Kanda Pattamakomsan;J. Goodwin;P. Praserthdam
中科院分区：
文献类型：
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作者：
J. Panpranot;Kanda Pattamakomsan;J. Goodwin;P. Praserthdam
考察了Pd/MCM-41和Pd/SiO2催化剂的特性和催化性能，并从Pd分散度、1-己烯液相加氢催化活性和催化剂失活等方面进行了比较。在Pd/MCM-41-大孔催化剂上观察到高的Pd分散，而其他催化剂由于显著量的Pd位于载体的孔外而显示出相对低的Pd分散。基于CO化学吸附结果，催化剂活性似乎主要与Pd分散体有关，而与扩散限制无关，因为本研究中使用的所有催化剂的TOF几乎相同。在所有情况下，浸出和烧结的Pd引起催化剂失活后5小时的间歇反应。但与孔径相近的Pd/SiO2相比，Pd/MCM-41具有更高的加氢活性和更低的金属损失。
The characteristics and catalytic properties of Pd/MCM-41 and Pd/SiO2were investigated and compared in terms of Pd dispersion, catalytic activities for liquid-phase hydrogenation of 1-hexene, and deactivation of the catalysts. High Pd dispersion was observed on Pd/MCM-41-large pore catalyst while the other catalysts showed relatively low Pd dispersion due to significant amount of Pd being located out of the pores of the supports. Based on CO chemisorption results, the catalyst activities seemed to be primarily related to the Pd dispersion and not to diffusion limitation since TOFs were nearly identical for all the catalysts used in this study. In all cases, leaching and sintering of Pd caused catalyst deactivation after 5-h batch reaction. However, compared to Pd/SiO2with a similar pore size, Pd/MCM-41 exhibited higher hydrogenation activity and lower amount of metal loss.