Fourier transform diffuse reflectance

In this contribution, the steady-state isotopic transient kinetic analysis-diffuse reflectance Fourier transform spectroscopy (SSITKA-DRIFTS) method provides further support to the conclusion that not only are infrared active formates likely intermediates in the water-gas shift (WGS) reaction, in agreement with the mechanism proposed by Shido and Iwasawa for Rh/ceria, but designing catalysts based on formate C-H bond weakening can lead to significantly higher... [Pg.365]

Diffuse-reflection Fourier-transform infrared spectroscopy, 41 6, 8... [Pg.90]

Another similar study of crystallization was performed where on-line ATR-FTIR spectroscopy was used to provide concentration information, however on-line diffuse reflectance Fourier-transform infrared... [Pg.442]

CE European certification DRIFT-IR diffuse reflectance Fourier-transform... [Pg.581]

Grap, R.T., Koenig, J.L. and Ishida, H. (1985). Diffuse reflectance fourier transform infrared spectroscopic study of chemical bonding and hydrothermal stability of an aminosilane on metal oxide surfaces. J. Adhesion 18, 93-110. [Pg.39]

Because chemical and structural properties of natural and artificial gems are very similar in this case, the possibilities of Raman and LIBS methods are rather limited. It was found that another laser-based techniques could be very effective for rapid spectroscopic discrimination between natural and synthetic emeralds, rubies, and alexandrite (Armstrong et al. 2000a,b). The first one is DRIFTS (Diffuse Reflectance Fourier Transformed Infra-Red Spectroscopy)... [Pg.320]

Gordon, R. J., N. J. Trivedi, B. P. Singh, and E. C. Ellis, Characterization of Aerosol Organics by Diffuse Reflectance Fourier Transform Infrared Spectroscopy, Environ. Sci. Technol., 22, 672-677 (1988). [Pg.426]

F. Diffuse-Reflection (Fourier-Transform) Infrared Spectroscopy (DRIFTS) (18)... [Pg.6]

Niemeyer, J., Chen, Y., and Bollag, J. M. (1992). Characterization of humic acids, composts, and peat by diffuse reflectance Fourier-transform infrared spectroscopy. Soil Sci. Soc. Am. J. 56,135-140. [Pg.723]

The introduction of Fourier Transform Infrared Spectroscopy (FTIR) brought along a number of typical solid sample techniques. DRIFTS (Diffuse Reflectance Fourier Transform Infrared Spectroscopy) is probably most commonly known. Another technique, developed specifically for measuring solid, opaque samples is PAS (Photo Acoustic Spectroscopy). This accessory is less known, probably due to its high cost and its rather difficult modus operandi. [Pg.491]

Diffuse reflectance Fourier Transform IR spectra were collected using an Analect RFX-65 FTIR spectrometer. KBr was used as the background material. RuY samples were diluted with KBr in order to obtain better transmittance. The position of the asymmetric T-0 stretching vibration was used to monitor changes in the Si/Al ratio (77). [Pg.373]

Diffuse reflectance Fourier Transform IR was also used to monitor the effect of the NaCl treatment on the RuY sample. The position of the asymmetric stretching T-0 vibration is directly related to the Si/Al ratio of the zeolite, with higher wavenumbers corresponding to higher Si/Al ratios (77). After the NaCl treatment, the position of this band drops from 1038 to 1025 cm l indicating a loss of silicon... [Pg.376]

Kolboe and Ellefsen (1962) and Michell et al. (1965) provided preliminary results indicating the feasibility of employing infrared spectroscopy to determine the lignin content of finely ground wood and pulp samples embedded in potassium chloride. Further development and refinement of this technique have led to methods for determination of lignin based on multiple internal reflectance infrared spectrometry (Marton and Sparks 1967) and diffuse reflectance Fourier transform spectrometry (Schultz et al. 1985). Lignin contents have also estimated by 13C CP/MAS/NMR spectrometry (Haw et al. 1984, Hemmingson and Newman 1985) (see Chap. 4.5). [Pg.43]

Schoning AG, Johansson G (1965) Absorptiometric determination of acid-soluble lignin in semichemical bisulfite pulps and in some woods and plants Sven Papperstidn 68 607-613 Schultz TP, Templeteon MC, McGinnis GD (1985) Rapid determination of lignocellulose by diffuse reflectance Fourier transform infrared spectrometry Anal Chem 57 2867- 2869 Sjostrom E, Enstrom B (1966) Spectrophotometnc determination of the residual lignin in pulp after dissolution in cadoxene Sven Papperstidn 69 469-476... [Pg.60]

Berben SA, Rademacher JP, Sell LO, Easty DB (1987) Estimation of lignin in wood pulp by diffuse reflectance Fourier-transform infrared spectrometry Tappi J 70(11) 129-133 Birkett M, Gambino M, Meyer JH, Egers D (1989) Estimation of kappa number of pulps by near-infrared spectroscopy Tappi J 72(9) 193-197 Bracewell R (1965) The Fourier transformation and its applications McGraw-Hill, New York, 381 pp... [Pg.106]

Ferraro JR, Basile LJ (1978) Fourier transform infrared application to national problems In Ferraro JR, Basile U (eds) Fourier transform infrared spectroscopy - applications to chemical systems, Vol 4 Academic Press, New York, 275-302 Ferraro JR, Rein AJ (1985) Application of diffuse reflectance spectroscopy in the far-infrared region In Ferraro JR, Basile LJ (eds) Fourier transform infrared spectroscopy -applications to chemical systems, Vol 4 Academic Press, New York, 244-282 Frank IE, Feikema J, Constantine N, Kowalski BR (1984) Prediction of product quality from spectral data using the partial least squares method J Chem Inf Comput Sci 24 20-24 Fuller MP, Griffiths PR (1980) Infrared microsampling by diffuse reflectance Fourier transform spectrometry Appl Spectrosc 34 533-539... [Pg.106]

Schultz TP, Glasser WG (1986) Quantitative structural analysis of lignin by diffuse reflectance Fourier transform infrared spectromety Holzforschung 40 (Suppl) 37-44 Schultz TP, Nicholas DD (1987) Fourier transform infrared spectrometry Detection of incipient brown rot decay in wood Int Analyst 41 35-39 Sjostrom M, Wold, S, Lindberg W, Persson J-A, Martens H (1983) A multivariate calibration problem in analytical chemistry solved by partial least-squares models in latent variables Anal Chim Acta 150 61-70... [Pg.109]

Gurka DF, Billets S, Brasch JW, Riggle CJ (1985), Anal. Chem. 57 1975-1979. Tetrachlorodi-benzodioxinisomer differentiation by micro-diffuse reflectance Fourier transform infrared spectrometry at the low nanogram level"... [Pg.76]

More realistic and complex tlieories consistent with the quite complex nature of the phenomena involved in the DR of light were developed later. Experimental studies have shown that this technique is affected by particle size, granulometric distribution and the refractive index of the particles, which has an important role when the particle size is near the wavelength of the 1R radiation. Diffuse reflectance Fourier transform (DRIFT) studies in the FIR region allow detection of the skeletal spectra of materials, such as mixed oxide catalysts, pigments and metal halides. [Pg.105]

Ostmeyer JG, Elder TJ, Winandy JE (1989) Spectroscopic analysis of southern pine treated with chromated copper arsenate II. Diffuse-reflectance Fourier-transform infrared spectroscopy (DRIFT). J Wood Chem Technol 9 105-122 Owen NL, Thomas DW (1989) Infrared studies of hard and soft" woods. Appl Spectrosc 43 451-455... [Pg.69]

Using diffuse reflectance Fourier transform infrared spectroscopy, Adhikari et al. studied the binding of oleic acid (88), triacylglycerol (89), and phosphatidylcholine (90) on silica gel at room temperature. Their interpretation was that oleic acid and triacylglycerols bind to silica surface hydroxyls via hydrogen bonding interactions between the carboxylate and ester carbonyls of these molecules, respectively. In contrast, phospholipids hydrogen bond to silica surface hydroxyls via the phosphate... [Pg.2713]

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