期刊
CHEMCATCHEM
卷 11, 期 17, 页码 4334-4339出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201900795
关键词
Dehydrogenation; Disproportionation; Ethene; EXAFS; Palladium Carbide
资金
- UK Catalysis Hub [EP/I038748/1, EP/K014714/1]
- EPSRC [EP/K014714/1, EP/K005030/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K005030/1] Funding Source: researchfish
In the presence of oxygenated organic molecules pure Pd, which is widely used in chemicals processing and the pharmaceutical industry, tends to defunctionalise and dehydrogenate such molecules to H-2, CO and surface/bulk carbon, in the form of a palladium carbide. We have investigated the formation of this carbide by ethene adsorption using a variety of techniques, including pulsed flow reaction measurements, XAS and DFT calculations of the lattice expansion during carbidisation. These experiments show that two main reactions take place above 500 K, that is, both total dehydrogenation, but also disproportionation to methane and the carbide, after which the activity of the Pd is completely lost. We estimate the value of x in PdCx to be 0.28 (+/- 0.03), and show by computer modelling that this fits the lattice expansion observed by XAFS, and that there is charge transfer to C from Pd of around 0.2-0.4 e.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据