Palladium supported on amino functionalized magnetic MCM-41 for catalytic hydrogenation of aqueous bromate
Palladium supported on amino functionalized magnetic MCM-41 for catalytic hydrogenation of aqueous bromate
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DOI：
10.1039/c4ra05593d
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发表时间：
2014-08
期刊：
影响因子：
3.9
通讯作者：
Huan Chen;Peng Zhang;Wenhui Tan;Fang Jiang;Rong Tang
中科院分区：
文献类型：
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作者：
Huan Chen;Peng Zhang;Wenhui Tan;Fang Jiang;Rong Tang
采用沉积-沉淀法（DP）和浸渍法（IMP）合成了氨基功能化磁性MCM-41负载钯。采用N2吸附、XRD、FTIR、CO化学吸附、TEM、XPS和VSM等手段对催化剂进行了表征。在此催化剂上进行了溴酸盐的液相催化加氢反应。结果表明，DP催化剂的活性高于IMP催化剂，这是由于其较高的Pd分散度。对于负载在磁性MCM-41上的DP催化剂，在不同的NH 2负载量下，Pd分散度与初始催化活性之间存在正相关关系。此外，DP-2催化剂（负载在磁性MCM-41上，每克具有0.99 mmol NH 2）用外部磁场完全回收，并且催化活性即使在用于溴酸盐还原的5个重复循环之后仍保持不变。
Pd supported on amino functionalized magnetic MCM-41 was synthesized by deposition–precipitation (DP) and impregnation (IMP) methods. The catalysts were characterized by N2 adsorption, XRD, FTIR, CO chemisorption, TEM, XPS and VSM. Liquid phase catalytic hydrogenation of bromate was tested over these catalysts. The results showed that the DP catalyst had a higher activity than the IMP catalyst, due to its higher Pd dispersion. With regards to DP catalysts supported on magnetic MCM-41 with different NH2 loading amounts, a positive relationship was observed between the Pd dispersion and the initial catalytic activity. Moreover, the DP-2 catalyst (supported on magnetic MCM-41 with 0.99 mmol of NH2 per g) was completely recovered with an external magnetic field, and the catalytic activity remained unaltered even after 5 repeated cycles for the bromate reduction.