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首页> 外文期刊>RSC Advances >Insight into the structure evolution and the associated catalytic behavior of highly dispersed Pt and PtSn catalysts supported on La2O2CO3 nanorods
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Insight into the structure evolution and the associated catalytic behavior of highly dispersed Pt and PtSn catalysts supported on La2O2CO3 nanorods

机译：La 2 O 2 CO 3 纳米棒上负载的高分散Pt和PtSn催化剂的结构演变及其相关的催化行为

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摘要

The current work introduces highly dispersed Pt and PtSn catalysts supported on La2O2CO3 nanorods prepared via ultrasonic impregnation, which are used as probe catalysts for the liquid-phase crotonaldehyde hydrogenation. The physicochemical properties of the catalysts are assessed by means of various techniques, including XRD, TEM, XPS, H2-TPD, in situ CO-DRIFT and X-ray adsorption fine structure (XAS). A close combination of catalyst surface experiments and the reactive performances reveals that the distinct reactive performance of the Pt and PtSn catalysts is tentatively attributed to the composition-dependent architecture of Pt–lanthanum interfaces and bimetallic particles while excluding the particle size effect. Catalytic activity tests demonstrate that incorporation of Sn into Pt catalyst brings great significance to the selective hydrogenation of carbonyl groups as it results into the structure evolution of bimetallic particles. An optimization of Sn loading and reaction conditions achieves a 5-fold and 7-fold improvement in the selectivity and yield to crotyl alcohol over the parent Pt catalyst. Lastly, it is found from the catalyst reusability study that metal particles of PtSn catalysts suffers easily from particle migration and growth compared to the Pt catalyst, most likely resulting from a weaker metal–support interaction.
机译：当前的工作介绍了负载在La 2 O 2 CO 3 纳米棒，用作液相巴豆醛加氢的探针催化剂。催化剂的物理化学性质通过各种技术评估，包括XRD，TEM，XPS，H 2 -TPD，原位 CO -DRIFT和X射线吸附精细结构（XAS）。催化剂表面实验和反应性能的紧密结合表明，Pt和PtSn催化剂独特的反应性能暂时归因于Pt-镧界面和双金属颗粒的成分依赖性结构，而没有考虑粒径效应。催化活性测试表明，将锡掺入Pt催化剂中对羰基的选择性氢化具有重要意义，因为它导致双金属颗粒的结构演变。与母体Pt催化剂相比，Sn载量和反应条件的优化可实现对巴豆醇的选择性和收率的5倍和7倍提高。最后，从催化剂可重复使用性研究中发现，与Pt催化剂相比，PtSn催化剂的金属颗粒容易遭受颗粒迁移和生长的影响，这很可能是由于金属与载体之间相互作用较弱所致。

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