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Hollow Pd–Sn Nanocrystals for Efficient Direct H2O2 Synthesis: The Critical Role of Sn on Structure Evolution and Catalytic Performance
ACS Catalysis ( IF 11.3 ) Pub Date : 2018-03-19 00:00:00 , DOI: 10.1021/acscatal.8b00347
Fumin Li 1 , Qi Shao 2 , Mancheng Hu 1 , Yu Chen 1 , Xiaoqing Huang 2
Affiliation  

The development of efficient catalysts with high activity and selectivity for the direct synthesis of H2O2 from H2 and O2 is highly desirable yet challenging. Herein, a series of Pd–Sn bimetallic nanocrystals with hollow structure have been successfully created as highly active and selective catalysts for direct H2O2 synthesis. We found that the introduction of Sn played an important role on the morphology evolution and composition control of the hollow Pd–Sn nanocrystals. Significantly, after rapid thermal treatment, the obtained hollow Pd–Sn/TiO2 catalysts can deliver complete inhibition of H2O2 decomposition/hydrogenation, resulting in a large activity enhancement for the H2O2 production. The H2 selectivity could be further improved by using water as the reaction solvent. Further investigation showed that the large activity enhancement of hollow Pd–Sn/TiO2 catalysts for the direct H2O2 synthesis can be attributed to the presence of PdO, the ensemble effect between the Pd and Sn, and the interface effect of Pd/SnOx and PdO/SnOx.

中文翻译:

空心Pd–Sn纳米晶体可用于直接H 2 O 2的直接合成:Sn对结构演变和催化性能的关键作用

对于从H 2和O 2直接合成H 2 O 2的高效活性和选择性高的高效催化剂的开发是非常需要的,但是具有挑战性。在此,已成功创建了一系列具有空心结构的Pd-Sn双金属纳米晶体,作为用于直接H 2 O 2合成的高活性和选择性催化剂。我们发现,Sn的引入在空心Pd-Sn纳米晶体的形态演变和成分控制中起着重要作用。重要的是,经过快速热处理后,所获得的中空Pd-Sn / TiO 2催化剂可以完全抑制H 2 O 2。分解/氢化,大大提高了H 2 O 2的生产活性。通过使用水作为反应溶剂,可以进一步提高H 2的选择性。进一步的研究表明,中空的Pd-Sn / TiO 2催化剂对H 2 O 2的直接合成具有较大的活性增强,这可以归因于PdO的存在,Pd和Sn之间的聚集效应以及Pd /的界面效应。 SnO x和PdO / SnO x
更新日期:2018-03-19
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