Diffuse reflection infrared spectroscopy

Vreugdenhil A J and Butler I S 1998 Investigation of MMT adsorption on soils by diffuse reflectance infrared spectroscopy DRIFTS and headspace analysis gas-phase infrared spectroscopy HAGIS Appl. Organomet. Chem. [Pg.1795]

Several properties of the filler are important to the compounder (279). Properties that are frequentiy reported by fumed sihca manufacturers include the acidity of the filler, nitrogen adsorption, oil absorption, and particle size distribution (280,281). The adsorption techniques provide a measure of the surface area of the filler, whereas oil absorption is an indication of the stmcture of the filler (282). Measurement of the sdanol concentration is critical, and some techniques that are commonly used in the industry to estimate this parameter are the methyl red absorption and methanol wettabihty (273,274,277) tests. Other techniques include various spectroscopies, such as diffuse reflectance infrared spectroscopy (drift), inverse gas chromatography (igc), photoacoustic ir, nmr, Raman, and surface forces apparatus (277,283—290). [Pg.49]

Infrared Spectroscopy Transmission Infrared Spectroscopy Diffuse Reflectance Infrared Spectroscopy (DRS, DRIFT) Infrared Emission Spectroscopy (IRES)... [Pg.216]

The surface structure and acid sites of alumina-supported molybdenum nitride catalysts have been studied using temperature-programed desorption (TPD), and reduction (TPR), diffuse reflectance infrared spectroscopy, and X-ray diffraction (XRD) analysis. The nitride catalysts were prepared by the temperature-programmed reaction of alumina-supported molybdenum oxide (12.5% and 97.1%) with NH3 at temperatures of 773, 973, and 1173 K. TPR and XRD analyses showed that y-Mo2N was already formed at 973 K. On the basis of NH3-TPD measurements and IR spectroscopy, it was found that Lewis acid sites were predominant over Bronsted acid sites on the surface of Mo2N/A1203. [Pg.454]

Emiroglu, S., Barsan, N., Weimar, U. et al. (2001) In situ diffuse reflectance infrared spectroscopy study of CO adsorption on Sn02. Thin Solid Films, 391, 176-85. [Pg.97]

Infrared spectroscopy Transmission infrared spectroscopy Diffuse reflectance infrared spectroscopy (DRIFTS) Attenuated total reflection (ATR)... [Pg.217]

Newton MA, Dent AJ, Fiddy SG, Jyoti B, Evans J. Combining diffuse reflectance infrared spectroscopy (DRIFTS), dispersive EXAFS, and mass spectrometry with high time resolution potential, limitations, and application to the study of NO interaction with supported Rh catalysts. Catal Today. 2007 126 64. [Pg.327]

Yoshitake H. (2000) Effects of surface water on N02-NaCl reaction studied by diffuse reflectance infrared spectroscopy (DRIRS). Atmos. Environ. 34, 2571-2580. [Pg.1977]

Krivacsy, Z. Hlavay, J. Method for the reliable quantitative analysis by diffuse reflectance infrared spectroscopy. J. Mol. Struct. 1995, 349, 289-292. [Pg.3385]

Detailed experimental procedures for obtaining infrared spectra on humic and fulvic acids have been reported previously 9,22,25-26) and will be briefly described here. Infrared spectra were taken on the size-fractionated samples by using a Fourier transform infrared spectrometer (Mattson, Polaris) with a cooled Hg/Cd/Te detector. Dried humic and fulvic materials were studied by diffuse reflectance infrared spectroscopy (Spectra Tech DRIFT accessory) and reported in K-M units, as well as by transmission absorbance in a KBr pellet. Infrared absorption spectra were obtained directly on the aqueous size-fractioned concentrates with CIR (Spectra Tech CIRCLE accessory). Raman spectra were taken by using an argon ion laser (Spectra-Physics Model 2025-05), a triple-grating monochromator (Spex Triplemate Model 1877), and a photodiode array detector system (Princeton Applied Research Model 1420). All Raman and infrared spectra were taken at 2 cm resolution. [Pg.98]

In addition to the XRPD quantitation of cefepine dihydrochloride dihydrate in samples of cefepine dihydrochloride monohydrate, diffuse reflectance infrared spectroscopy was used to determine the solvatomorphic composition.24 For the IR assay, a working range of 1.0-8.0% w/w, with a detection limit of 0.3% and a quantitation limit of 1.0%, and these analytical limits were superior to those obtained using the quantitative XRPD method. The validity of both assay methods were limited for samples having a particle size range of 125-590 pm. [Pg.51]

Culler, S. R., Diffuse Reflectance Infrared Spectroscopy Sampling Techniques for Qualita-tive/Quantitative Analysis of Solids. In Polymorphism in Pharmaceutical Solids Brittain, H. G., Ed. Marcel Dekker New York 1999, pp. 93. [Pg.237]

Correction of dispersive line shape artifact observed in diffuse reflection infrared spectroscopy and absorption/reflection (transflection) infrared micro-spectroscopy. Vib. Spectrosc., 38, 129-32. [Pg.145]

F. Hilbrig, H. E. Gobel, H. Knozinger, H. Schmetz, and B. LengeIers",Interaction of Arsenious Oxide with deNOx Catalysts An X-ray Absorption and Diffuse Reflectance Infrared Spectroscopy Study". J. Catal.. 1991. 129. 168-176. [Pg.179]

Generally speaking, the methods used to characterize carbonaceous material surfaces are referred to as wet and dry techniques. The former include potentiometric titrations and zeta potential or electrochemical methods the latter include temperature-programmed desorption (TPD) and spectroscopic methods such as x-ray photoelectron spectroscopy (XPS) and diffuse reflectance infrared spectroscopy (DRIFT). [Pg.58]

Infrared. Diffuse reflectance Infrared spectroscopy has been... [Pg.261]

P.W. Yang and H.L. Casal, In-Situ Monitoring of Solid-State Photochemical Reactions by Diffuse Reflectance Infrared Spectroscopy, Appl. Spectrosc., 40(7), pp. 1070-1073, 1986. [Pg.395]

Showed that carbon in the surface or skin [12] consists of carbide (51%) carbon (41%) and carbonate (8%). Infrared depth profiling by diffuse reflectance infrared spectroscopy (DRIFT) provided further important insights [52], It showed that carbon alters the oxygen environment of the aluminum atoms near the fiber surface from octahedral to tetrahedral coordination and promotes the generation of carbonaceous species such as ethers and esters in addition to carbonates and carbides [52] which have also been found with XPS [12],... [Pg.111]

Koretsky CM, Svegensky DA, Salisbitry JM, D Aria DM (1997) Detection of smface hydroxyl species on quartz, y-almnina and feldspars using diffuse reflectance infrared spectroscopy. Geochim Cosmochim Acta 61 2193-2210... [Pg.480]

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