کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5424663 | 1395832 | 2007 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The reaction of carbon monoxide with palladium supported on cerium oxide thin films
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کلمات کلیدی
Soft X-ray photoelectron spectroscopy - اشعه ماوراء بنفش اشعه ایکسtemperature programmed desorption - درجه حرارت برنامه ریزی شده desorptionThermal desorption - دفع حرارتیCerium - سریمcarbon monoxide - منوکسیدکربنScanning tunneling microscopy - میکروسکوپ تونلی روبشی Palladium - پالادیوم یا پالادیمSintering - پختن
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The reaction of carbon monoxide with palladium supported on cerium oxide thin films The reaction of carbon monoxide with palladium supported on cerium oxide thin films](/preview/png/5424663.png)
چکیده انگلیسی
In this study we probe the reaction of carbon monoxide with Pd nanoparticles supported on cerium oxide thin films. With the use of soft X-ray photoelectron spectroscopy (sXPS), and temperature programmed desorption (TPD) the surface intermediates and pathways leading to reaction products of CO on Pd supported on ceria were investigated. When Pd is supported on the stoichiometric CeO2 surface (Ce+4) only the molecular adsorption of CO on Pd is visible (286.4Â eV). All of the CO desorbs below 520Â K, however a small amount of O exchange between the CO and the ceria was indicated through the acquisition of labeled 18O from the substrate in the desorbed CO. The Pd nanoparticles are activated on partially reduced CeOx to promote the dissociation of <10% of the CO as indicated by a C-Pd species (284.4Â eV) in sXPS. The C recombines with O from the ceria and desorbs between 600 and 700Â K. The majority of the CO does not dissociate, however, and the degree of dissociation does not increase with the degree of ceria reduction. This result is in contrast with Rh nanoparticles supported on ceria where the degree of dissociation increased with the degree of ceria reduction and nearly total dissociation was obtained when the ceria was highly reduced.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 601, Issue 15, 1 August 2007, Pages 3215-3223
Journal: Surface Science - Volume 601, Issue 15, 1 August 2007, Pages 3215-3223
نویسندگان
S.D. Senanayake, J. Zhou, A.P. Baddorf, D.R. Mullins,