Abstract
The catalytic oxidation of CO by O2 to form CO2 over Pt surfaces and supported catalysts is one of the most studied catalytic reactions from both fundamental and applied points of view. This review aims to show how the application of a range of time resolved, X-ray based techniques, such as X-ray diffraction (XRD), Surface X-ray diffraction (SXRD), total X-ray scattering/pair distribution function (PDF), X-ray absorption (XAFS), X-ray emission (XES), and X-ray photoelectron spectroscopies (XPS), applied under operando conditions and often coupled to adjunct techniques (for instance mass spectrometry (MS) and infrared spectroscopy (IR)) have shed new light on the structures and mechanisms at work in this most studied of systems. The aim of this review is therefore to demonstrate how a fusion of the operando philosophy with the ever augmenting capacities of modern synchrotron sources can lead to new insight and catalytic possibilities, even in the case of a process that has been intensely studied for almost 100 years.
Highlights
CO oxidation by O2 to yield CO2 is one of the most important and most studied catalytic processes.It is a notionally simple reaction and of fundamental interest within that canon of research devoted to the detailed understanding or heterogeneous gas-solid reactions
2 -weighted Extended X-ray absorption fine structure (EXAFS) data obtained from Pt L -edge QEXAFS at corrected
What this study revealed was that Pt particles of the order of 1 nm diameter were disrupted to form carbonyls that were readily assimilated into particles of ca. 2 nm in yet a further example of just how fluid Pt surfaces and nanoparticles can become under the influence of CO at elevated pressure
Summary
CO oxidation by O2 to yield CO2 is one of the most important and most studied catalytic processes It is a notionally simple reaction and of fundamental interest within that canon of research devoted to the detailed understanding or heterogeneous gas-solid reactions. Research into CO removal via oxidation was stimulated by problems of air quality, though in other areas: the military, where air purification technologies were required for gas-masks and maintaining clean atmospheres in such enclosed environments as submarines; and civil situations, such as mining, general energy production, and as a result of the use of coal, often in poorly ventilated surroundings, as a fuel in everyday life, were issues that needed to be addressed [1,2,3]. Ever more stringent air quality regulations mean that the demand for effective CO removal technologies, especially those that may function at ambient temperatures, ensures that research into this most basic of conversions shows no signs of abating
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
