@article {149,
	title = {Carbon dioxide adsorption on oxide nanoparticle surfaces.},
	journal = {Chemical Engineering Journal (Amsterdam, Netherlands)},
	volume = {170},
	year = {2011},
	note = {CAPLUS AN 2011:672234(Journal; Online Computer File)},
	month = {2011///},
	pages = {471 - 481},
	publisher = {Elsevier B.V.},
	abstract = {In this paper, focused on environmental nanotechnol., we review some recent results for carbon dioxide (CO2) adsorption on hydroxylated Fe2O3, γ-Al2O3, and TiO2 nanoparticle surfaces at 296 K as followed by transmission FTIR spectroscopy.  In the absence of water vapor (<1\% relative humidity, RH), following exposure to CO2 different species formed on the oxide surface due to the presence of adsorption sites with different basicities.  While the majority surface species on Fe2O3, γ-Al2O3 is detd. to be adsorbed bicarbonate, on TiO2 nanoparticles bidentate carbonate was more prevalent.  A carboxylate species was obsd. on TiO2 nanoparticles under dry conditions as well.  When water is present at 40\% RH, the nature of the adsorbed CO2 species changed to that of solvated carbonate formation in the adsorbed water layer.  Obsd. initial adsorption rates were calcd. from time-course expts. under dry conditions and in the presence of 40\% RH.  When initial adsorption rates were compared between dry and wet expts., a larger value was found for dry expts. suggesting that CO2 mols. have to compete for adsorption sites with water on these nanoparticle surfaces.  As discussed here, quantum chem. calcns. provide some addnl. insights into CO2 adsorption on hydroxylated metal oxide surfaces in the presence and absence of molecularly adsorbed water. [on SciFinder(R)]},
	keywords = {carbon dioxide adsorption oxide nanoparticle surface relative humidity water},
	isbn = {1385-8947},
	author = {Baltrusaitis, Jonas and Schuttlefield, Jennifer and Zeitler, Elizabeth and Grassian, Vicki H.}
}
@article {184,
	title = {FTIR spectroscopy combined with quantum chemical calculations to investigate adsorbed nitrate on aluminum oxide surfaces in the presence and absence of co-adsorbed water.},
	journal = {Physical Chemistry Chemical Physics},
	volume = {9},
	year = {2007},
	note = {CAPLUS AN 2007:1019734(Journal)},
	month = {2007///},
	pages = {4970 - 4980},
	publisher = {Royal Society of Chemistry},
	abstract = {Surface reactions of nitrogen oxides with aluminum oxide particles result in the formation of adsorbed nitrate.  Specifically, when α-Al2O3 and γ-Al2O3 particles are exposed to gas-phase NO2 and HNO3 adsorbed nitrate forms on the surface.  In this study, Fourier transform IR (FTIR) spectroscopy is combined with quantum chem. calcns. to further our understanding of the adsorbed nitrate product on aluminum oxide particle surfaces in the presence and absence of co-adsorbed water at 296 K.  FTIR spectra of adsorbed nitrate on α-Al2O3 and γ-Al2O3 particles are interpreted using calcd. vibrational frequencies of nitrate coordinated to binuclear Al oxide cluster models.  Comparison of the calcd. and exptl. vibrational frequencies of adsorbed nitrate establishes different modes of coordination (monodentate, bidentate and bridging) of the nitrate ion to the surface in the absence of adsorbed water.  In the presence of co-adsorbed water, the nitrate ion becomes fully solvated, as shown by a comparison of the exptl. nitrate IR spectra as a function of relative humidity with the calcd. nitrate vibrational frequencies for binuclear Al cluster compds. which contain both coordinated nitrate ions and water mols.  These calcns. also suggest that adsorbed water can displace nitrate from direct coordination to the surface, leading to an outer-sphere nitrate adsorption complex as well as an inner-sphere complex.  Furthermore, the relative humidity dependence of the spectra suggest that water does not evenly wet the surface even at high relative humidity, as there are open or bare surface sites where nitrate ions are not solvated.  Besides adsorbed monodendate, bidendate, bridging and solvated nitrate, the presence of ion bound nitrate ion, partially solvated nitrate, mol. nitric acid, hydronium ion and H3O+:NO3- ion pairs on the oxide surface are also discussed. [on SciFinder(R)]},
	keywords = {adsorption surface reaction nitrate alumina water coadsorption},
	isbn = {1463-9076},
	author = {Baltrusaitis, Jonas and Schuttlefield, Jennifer and Jensen, Jan H. and Grassian, Vicki H.}
}
