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Velin P, Stenman U, Skoglundh M, et al. Portable device for generation of ultra-pure water vapor feeds. Rev Sci Instrum. 2017;88(11):115102doi: 10.1063/1.4994245.
Velin, P., Stenman, U., Skoglundh, M., & Carlsson, P. A. (2017). Portable device for generation of ultra-pure water vapor feeds. The Review of scientific instruments, 88(11), 115102. https://doi.org/10.1063/1.4994245
Velin, P, et al. "Portable device for generation of ultra-pure water vapor feeds." The Review of scientific instruments vol. 88,11 (2017): 115102. doi: https://doi.org/10.1063/1.4994245
Velin P, Stenman U, Skoglundh M, Carlsson PA. Portable device for generation of ultra-pure water vapor feeds. Rev Sci Instrum. 2017 Nov;88(11):115102. doi: 10.1063/1.4994245. PMID: 29195377.
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Rev Sci Instrum. 2017 Nov;88(11):115102. doi: 10.1063/1.4994245.

Portable device for generation of ultra-pure water vapor feeds.

The Review of scientific instruments

P Velin, U Stenman, M Skoglundh, P-A Carlsson

Affiliations

  1. Department of Chemistry and Chemical Engineering, Competence Centre for Catalysis, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
  2. Department of Space, Earth and Environment, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.

PMID: 29195377 DOI: 10.1063/1.4994245

Abstract

A portable device for the generation of co-feeds of water vapor has been designed, constructed, and evaluated for flexible use as an add-on component to laboratory chemical reactors. The vapor is formed by catalytic oxidation of hydrogen, which benefits the formation of well-controlled minute concentrations of ultra-pure water. Analysis of the effluent stream by on-line mass spectrometry and Fourier transform infrared spectroscopy confirms that water vapor can be, with high precision, generated both rapidly and steadily over extended periods in the range of 100 ppm to 3 vol. % (limited by safety considerations) using a total flow of 100 to 1500 ml/min at normal temperature and pressure. Further, the device has been used complementary to a commercial water evaporator and mixing system to span water concentrations up to 12 vol. %. Finally, an operando diffuse reflective infrared Fourier transform spectroscopic measurement of palladium catalysed methane oxidation in the absence and presence of up to 1.0 vol. % water has been carried out to demonstrate the applicability of the device for co-feeding well-controlled low concentrations of water vapor to a common type of spectroscopic experiment. The possibilities of creating isotopically labeled water vapor as well as using tracer gases for dynamic experiments are discussed.

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