Ventacon Wotton Limited
FOURIER TRANSFORM RAMAN CELLS
Designed and optimised exclusively for Fourier Transform Raman Spectrometers
Series CAT-1 cell system
The Ventacon Series CAT cell provides catalytic chemists with a facility to activate catalysts and then to study them in their F-T Raman instruments.
Most chemistry on catalysts involves heating the sample (in powder or pellet form) either in vacuum or in an oxidizing or reducing atmosphere as a first stage. The reactions that take place under these conditions normally make the catalyst active. Raman studies before and after activation can be highly informative.
Reactants passed over a heated specimen of the activated catalyst can then provide detailed information on the chemistry involved if one observes the in situ process and the makeup of the exhaust gas.
A popular method of the in situ analysis is vibrational spectroscopy – both infrared and Raman. Fluorescence tends to cause severe problems with Raman measurements but the use of near infrared sources and F-T processing minimise this particular nuisance.
The Ventacon CAT cell system comprises of a glass horizontal tube containing the catalyst held with glass wool pads inside a small oven surrounded with insulating material. Gas can be passed through the catalyst via external flexible tubes or the sample can be evacuated.
To activate the catalyst temperatures up to 300ºC can be applied. To study the Raman spectra, the temperature range is restricted to Room Temp ®200ºC. Coupling between the CAT cell is maintained using industry standard 1/16” capillary stainless steel tubing.
Activated catalysts are frequently coloured and hence absorb the incident laser radiation when studying the Raman spectra. It is well established that this absorption can be minimised by moving the sample beneath the laser beam continuously. The Ventacon Cat cell gently moves up and down whilst spectra are recorded hence the laser beam tracks across the catalyst surface. The Ventacon CAT cell system must be powered by one of the Ventacon D Series Universal Power supplies. These supplies provide energy for the oven and power and control the vertical translation system.
|CAT-1||Catalyst cell including 3 spare borosilicate reaction tubes and 2m of capillary stainless steel tubing. This system is optimised for the Nicolet Range of instruments.|
|CAT-2||As above, but optimised for the Perkin Elmer system 2000R instrument.|
|When ordering, please state with which spectrometer you wish to use the accessory.|
All Ventacon accessories operate within your instrument’s sample chamber with the lid closed and interlocked. Users of Nicolet Instruments must fit a model A-22 Light Trap into their instruments. This is provided f.o.c. by Ventacon Ltd.
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Ventacon Wotton Limited
3 The Oatground
Telephone and Fax: +44 (0) 1453 843968
Check out our own web site at http://www.ventaconwotton.com