DRIFTS infrared Fourier transform

DRIFTS Diffuse reflectance infrared Fourier-transform Same as IR Same as IR... [Pg.317]

Lennard C J, Mazzella W D and Margot P A 1993 Some applioations of diffuse refleotanoe infrared Fourier transform speotrosoopy DRiFTS in forensio soienoe Analysis 21 M34-7... [Pg.1796]

Zeine C and Grobe J 1997 Diffuse refleotanoe infrared Fourier transform DRIFT speotrosoopy in the preservation of historioal monuments studies on salt migration Mikrochim. Acta 125 279-82... [Pg.1796]

Although acetone was a major product, it was not observed by infrared spectroscopy. Flowing helium/acetone over the catalyst at room temperature gave a prominent carbonyl band at 1723 cm 1 (not show here). In this study, a DRIFTS (diffuse reflectance infrared Fourier transform spectroscopy) cell was placed in front of a fixed reactor DRIFTS only monitored the adsorbed and gaseous species in the front end of the catalyst bed. The absence of acetone s carbonyl IR band in Figure 3 and its presence in the reactor effluent suggest the following possibilities (i) acetone formation from partial oxidation is slower than epoxidation to form PO and/or (ii) acetone is produced from a secondary reaction of PO. [Pg.407]

The experimental system consists of three sections (i) a gas metering section with interconnected 4-port and 6-port valves, (ii) a reactor section including an in-situ diffused reflectance infrared Fourier transform spectroscopy reactor (DRIFTS) connected to tubular quartz reactor, (iii) an effluent gas analysis section including a mass spectrometer or a gas chromatograph (9). [Pg.410]

DRIFT diffuse reflectance infrared Fourier transform... [Pg.320]

In the diffuse reflectance mode, samples can be measured as loose powders, with the advantages that not only is the tedious preparation of wafers unnecessary but also diffusion limitations associated with tightly pressed samples are avoided. Diffuse reflectance is also the indicated technique for strongly scattering or absorbing particles. The often-used acronyms DRIFT or DRIFTS stand for diffuse reflectance infrared Fourier transform spectroscopy. The diffusely scattered radiation is collected by an ellipsoidal mirror and focussed on the detector. The infrared absorption spectrum is described the Kubelka-Munk function ... [Pg.224]

Diffuser aerators, jet air, 26 165 Diffuse reflectance, 14 231 Diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), 24 72, 110-111... [Pg.268]

DRIFT spectra, acquiring, 24 111. See also Diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) Drilling, of hydrothermal wells, 12 525-527 Drilling fluid (drilling mud) companies, 9 2 Drilling fluid materials, 9 2, 9-25. See also Drilling fluids Drilling muds alkalinity control in, 9 19 barite, 9 9-10 calcite, 9 10... [Pg.289]

Direct NIR or MIR measurements of whole soil can be made using attenuated total reflectance (ATR) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) samplers. This type of measurement detects only components on the surface and so has severe limitations when information about the bulk soil is needed [4],... [Pg.179]

Persson et al. (1991) used diffuse reflection infrared Fourier transform (DRIFT) spectroscopy to study the interactions between galena, pyrite sphalerite and ethyl xanthate. They provided the evidence that the DRIFT spectrum of oxidized galena treated with an aqueous solution of potassium ethyl xanthate is practically identical with that of solid lead (II) ethyl xanthate, which can be formed as the only detectable siuface species on oxidized galena. Dialkyl dixanthogen is formed as the only siuface species in the reaction between oxidized pyrite and aqueous solution of potassium alkyl xanthate. [Pg.99]

DRIFT Diffuse reflectance infrared Fourier-transformed specaroscopy... [Pg.520]

Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) is used to obtain spectra of powders and rough polymeric surfaces such as textiles and paper. IR radiation is focused onto the surface of the sample in a cup resulting in both specular reflectance (which directly reflects off the surface having equal angles of incidence and reflectance) and diffuse reflectance (which penetrates into the sample subsequently scattering in all angles). Special mirrors allow the specular reflectance to be minimized. [Pg.426]

Answers, (i) KCI disc or diffuse refiectance infrared Fourier transform (DRIFT) in KCI powder ... [Pg.104]

Vogt, R., and B. J. Finlayson-Pitts, A Diffuse Reflectance Infrared Fourier Transform Spectroscopic (DRIFTS) Study of the Surface Reaction of NaCI with Gaseous N02 and UNO, J. Phys. Chem., 98, 3747-3755 (1994) J. Phys. Chem., 99, 13052 (1995). [Pg.178]

Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFT).6 When IR radiation is directed onto the surface of a solid sample, two types of energy reflectance can occur specular and diffuse. The specular component is the radiation that reflects directly off the sample surface (i.e., not absorbed by the sample). Diffuse reflectance is the radiation that penetrates into the sample and then emerges. Diffuse reflectance accessories are designed to optimize the diffuse reflected energy and suppress the specular component. The optics therefore selectively directs the scattered radiation to the IR detector. [Pg.223]

Chan, T. Y. Chen, R. Sofia, M. J. Smith, B. C. Glennon, D. High Throughput On-Bead Monitoring of Solid Phase Reactions by Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS), Tetrahedron Lett. 1997, 38, 2821. [Pg.244]

Secondly, compared to methanol oxidation, the rates of reaction decrease significantly upon oxidation of HMF for the Pt and Pd catalysts. In the case of Pt this decrease is drastic under the mild conditions applied here, indicating a strong interaction of HMF with the Pt surface. In the case of Pd the decrease is less pronounced and for Pd/Al-N even an increase in rate of reaction is found (entries 3 and 15). Probably the interaction of HMF with Pd is less strong, especially in the case of highly dispersed Pd. In order to study the interaction of HMF with noble metals, DRIFT (diffuse reflectance infrared fourier transform) measurements are in progress. [Pg.392]

Diffuse reflection involves reflecting the infrared beam off of a solid sample, as in specular reflection, but it is the nonspecular portion of the reflected radiation that is collected. When an ftir spectrometer is used, diffuse reflection is called DRIFTS (diffuse reflectance infrared Fourier-transform... [Pg.198]

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