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In situ FTIR investigations of reverse water gas shift reaction activity at supercritical conditions by V. Arunajatesan; B. Subramaniam; K.W. Hutchenson; F.E. Herkes is a Engineering article available to read on EtoBox.

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In situ Fourier transform infrared spectroscopy was employed to investigate the formation of CO and other adsorbed species on Al 2 O 3supported catalysts exposed to a supercritical mixture of CO 2 and H 2 (P = 138 bar; T = 342 K; molar CO 2 /H 2 = 19). On just the Al 2 O 3 support, surface carbonates are observed consistent with literature reports with some evidence of surface formates. On Pd/Al 2 O 3 , however, several surface species including carbonates, formates, and CO are unambiguously observed. On Pd/Al 2 O 3 , a peak at 1900.1920 cm -1 corresponds to adsorbed CO. Based on the presence of water peaks at reaction conditions, the reverse water gas shift reaction is the most plausible mechanism for CO formation. The CO peak evolves with time on stream, gradually increasing in intensity from ∼ 20 min to 5 h. This suggests that short-residence time continuous reactors are preferred over batch reactors to minimize the effects of possible catalyst deactivation by CO. Interestingly, the CO peak was not observed on either Ru/Al 2 O 3 or Ni/Al 2 O 3 catalysts suggesting that either of these catalysts may be better suited than Pt-or Pd-based catalysts for hydrogenation in supercritical

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Author

V. Arunajatesan; B. Subramaniam; K.W. Hutchenson; F.E. Herkes

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0009-2509)

Published

2007

Language

EN

Field

Engineering (Physical Sciences)