CO2 adsorption on Cr(110) and Cr2O3(0001)/Cr(110)

Funk, S.; Nurkic, T.; Hokkanen, B.; Burghaus, U.

doi:10.1016/j.apsusc.2007.02.052

Cited by 19 publications

(11 citation statements)

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“…46−48 For CO 2 molecules in the monolayer (CO 2 molecules directly adsorbed on the substrate), the desorption energy of CO 2 on graphene ((30.1−25.1) ± 1.5 kJ/mol) obtained by this study is similar to that on HOPG 46 and that on Cu(110), 47 but lower than those on Cr(110) and Cr 2 O 3 (0001) surfaces. 48 For CO 2 molecules in the multilayer (condensed CO 2 ), the desorption energy on graphene (25.4 ± 1.5 kJ/mol) is in good agreement with the values on other substrates 46 and sublimation energy of dry ice (27−25 kJ/mol). 44,45 Based on the low desorption energies below 30 kJ/mol obtained from TPD spectra, the adsorption of CO 2 on graphene is classified into physisorption.…”

Section: Resultsmentioning

confidence: 99%

Adsorption of CO₂on Graphene: A Combined TPD, XPS, and vdW-DF Study

et al. 2017

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The adsorption of CO2 molecules on monolayer epitaxial graphene on a SiC(0001) surface at 30 K was investigated by temperature-programmed desorption and X-ray photoelectron spectroscopy. The desorption energy of CO2 on graphene was determined to be (30.1–25.1) ± 1.5 kJ/mol at low coverages and approached the sublimation energy of dry ice (27–25 kJ/mol) with increasing the coverage. The adsorption of CO2 on graphene was thus categorized into physisorption, which was further supported by the binding energies of CO2 in core-level spectra. The adsorption states of CO2 on graphene were theoretically examined by means of the van der Waals density functional (vdW-DF) method that includes nonlocal correlation. The experimental desorption energy was successfully reproduced with high accuracy using vdW-DF calculations; the optB86b-vdW functional was found to be most appropriate to reproduce the desorption energy in the present system.

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Section: Resultsmentioning

confidence: 99%

Adsorption of CO₂on Graphene: A Combined TPD, XPS, and vdW-DF Study

et al. 2017

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“…Thus, the relative enhancement of energy transfer is independent of E i . This implies also that the initial slope of S vs Θ curves is independent of E i , an effect which was also seen for other very different systems (e.g., CO adsorption on ZnO, ref ; CO 2 on Cr(110), ref ); i.e., it seems to be intrinsic to the adsorbate-assisted adsorption rather than the substrate.…”

Section: Presentation and Discussion Of The Resultsmentioning

confidence: 99%

Adsorption Kinetics and Dynamics of CO₂ on Ru(0001) Supported Graphene Oxide

2016

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Adsorption kinetics and dynamics of CO 2 on Ru(0001), graphene grown on Ru, and graphene oxide (GO) on Ru were studied. Graphene and GO were made in ultrahigh vacuum by benzene decomposition and subsequent atomic oxygen adsorption, respectively. The samples were characterized by AES (Auger electron spectroscopy) and XPS (X-ray photoelectron spectroscopy). As determined by TDS (thermal desorption spectroscopy), CO 2 physisorbs molecularly at ∼85 K on Ru and GO, but not on graphene. Binding energies amount to ∼26 kJ/mol and were slightly enhanced on GO as compared with Ru. Similarly, adsorption probabilities, as determined by molecular beam scattering, are larger on GO than on Ru.

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“…Many metal oxides display CO 2 adsorption properties including calcium oxides, magnesium oxides, lithium oxides ( (Ismail et al 1997), tantalum oxides (Dobrova et al 2006), copper oxides (Pohl and Otto 1998), chromium oxides (Funk et al 2007), and aluminum oxides (Horiuchi et al 1998;Yong et al 2000;Casarin et al 2003).…”

Section: Metal-based Solidmentioning

confidence: 99%

Carbon Capture and Storage

2015

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is a leading geoscientist of his generation, venture capitalist, and a significant figure in the politics of Colorado. In this article he reviews some inconvenient truths about the timely implementation of CCS projects in the US, some of which may resonate in other countries seeking CO 2 reduction measures.T he greatest challenge to carbon capture and storage (CCS) is likely to be economic rather than technical. A September 2008 McKinsey report estimated that the first commercial scale CCS projects, potentially to be built soon after 2020, would cost €35-50 per metric ton of CO 2 abated. They assume that if 500+ projects were built by 2030, the cost might fall to €25-40 per ton. About two-thirds of that cost is for CO 2 capture.It is interesting to consider those costs on a global scale. A study by Pacala and Socolow implies that we need to cut a cumulative 25 Gton of CO 2 over the next 50 years just to cap the CO 2 concentration in the atmosphere at a modest 500 ppm (we are now at 390 ppm). If all of our solutions cost €25 per ton, the economic impact would be €625 billion ($833 billion) over the next 50 years.Reducing CO 2 is a global issue, but the US creates 20% of the problem. It also offers an interesting case study on the difficulty of finding practical solutions in a challenging political and economic environment. Hopefully along the way the reader will discover opportunities as well as pitfalls to avoid.According to the US Department of Energy's Energy Information Administration (DOE-EIA), 98% of America's human-generated CO 2 comes from energy use, with 40% of that from electricity (coal and natural gas) and 33% from transportation (mostly petroleum). Coal produces 45% of America's electricity and natural gas produces 23% (see Figure 1).McKinsey's study notes that 'Retrofitting of existing power plants is likely to be more expensive than new installations, and economically feasible only for relatively new plants (with high efficiencies).' But according to the DOE-EIA, over the past 20 years coal contributed only 3.7% of total added US capacity while natural gas accounted for 88%. Few modern, efficient US coal plants have been added in the past 20 years.'Efficiency' is a term used to define the conversion of the theoretical energy content of a fuel into electricity. The McKinsey report notes that the energy required for the CCS CO 2 capture process increases the amount of coal that must be burned per MW-hour delivered, and estimates a CCS 'efficiency penalty' of 10%. This means that if a future coal plant could be built to achieve a 50% thermal efficiency, CCS would decrease that efficiency to 40%. Such a plant would be burning 50/40=1.25 times as much coal per MW-hour. And burning 25% more coal would also increase harmful emissions since CCS captures only about 90% of CO 2 and none of the other pollutants.CCS also faces storage challenges, such as site selection, CO 2 transportation costs, pipeline and CCS site permits, and uncertainties in monitoring CO 2 sequestration. Leakage of just 0.5% per year w...

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CO2 adsorption on Cr(110) and Cr2O3(0001)/Cr(110)

Cited by 19 publications

References 42 publications

Adsorption of CO₂on Graphene: A Combined TPD, XPS, and vdW-DF Study

Adsorption of CO₂on Graphene: A Combined TPD, XPS, and vdW-DF Study

Adsorption Kinetics and Dynamics of CO₂ on Ru(0001) Supported Graphene Oxide

Carbon Capture and Storage

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CO2 adsorption on Cr(110) and Cr2O3(0001)/Cr(110)

Cited by 19 publications

References 42 publications

Adsorption of CO2on Graphene: A Combined TPD, XPS, and vdW-DF Study

Adsorption of CO2on Graphene: A Combined TPD, XPS, and vdW-DF Study

Adsorption Kinetics and Dynamics of CO2 on Ru(0001) Supported Graphene Oxide

Carbon Capture and Storage

Contact Info

Product

Resources

About

Adsorption of CO₂on Graphene: A Combined TPD, XPS, and vdW-DF Study

Adsorption of CO₂on Graphene: A Combined TPD, XPS, and vdW-DF Study

Adsorption Kinetics and Dynamics of CO₂ on Ru(0001) Supported Graphene Oxide