PdCu single atom alloys supported on alumina for the selective hydrogenation of furfural
PdCu single atom alloys supported on alumina for the selective hydrogenation of furfural
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DOI：
10.1016/j.apcatb.2021.120652
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发表时间：
2021-09-04
影响因子：
22.1
通讯作者：
Kyriakou, Georgios
中科院分区：
文献类型：
--
作者：
Islam, Mohammed J.;Mesa, Marta Granollers;Kyriakou, Georgios
单原子催化剂作为一种熟练的控制贵金属在多相催化剂上，所有的活性位点都可以进行催化反应。本文报道了采用氧化铝负载的PdCu单原子合金对糠醛进行选择性加氢。这是一类特殊的原子效率，单位点催化剂，其中微量浓度的Pd原子（0.0067 wt%）取代了宿主纳米颗粒上的表面Cu位点。经EXAFS证实，Pd原子与Cu完全配位，Pd-Cu键的长度与Cu-Cu键的长度相同。选择性表面氧化催化剂也通过EXAFS确认了表面Pd原子。与单金属催化剂相比，这些催化剂具有Cu催化剂（选择性高但活性差）和Pd催化剂（活性高但无选择性）的优点，从而提高了糠醛到糠醇的转化率，使其成为绿色/原子高效催化的最佳催化剂。
Single-atom catalysts serve as a skilful control of precious metals on heterogenous catalysts where all active sites are accessible for catalytic reactions. Here we report the adoption of PdCu single-atom alloys supported on alumina for the selective hydrogenation of furfural. This is a special class of an atom efficient, single-site catalyst where trace concentrations of Pd atoms (0.0067 wt%) displace surface Cu sites on the host nanoparticle. Confirmed by EXAFS, the Pd atoms are entirely coordinated to Cu, with Pd-Cu bond lengths identical to that of a Cu-Cu bond. Selectively surface oxidised catalysts also confirm surface Pd atoms by EXAFS. These catalysts improve the conversion of furfural to furfuryl alcohol compared to monometallic catalysts, as they have the advantages of Cu (high selectivity but poor activity) and Pd catalysts (superior activity but unselective) without the drawbacks, making them the optimal catalysts for green/atom efficient catalysis.