INVESTIGATION ON REVERSE WATER-GAS SHIFT OVER La$_2$NiO$_4$ CATALYST BY CW-CAVITY ENHANCED ABSORPTION SPECTROSCOPY DURING CH$_4$/CO$_2$ REFORMING
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Date
2006
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Ohio State University
Abstract
Reverse water-gas shift (RWGS) reaction over La$_2$NiO$_4$ catalyst was investigated during CH$_4$/CO$_2$ reforming by continuous wave (cw) cavity enhanced absorption spectroscopy (CEAS), a sensitive absorption technique. A cw-diode laser with wavelength in the 1.3 $\mu$m region and an optical cavity consists of a pair of high reflectivity mirrors (0.99995) were used in the experiment. Absorption lines of the $\Delta J = 0$ (Q branch) rotational transitions of the 2$_0^1$3$_0^1$ vibrational transition of CH$_4$ near 7510 cm$^{-1}$, and the $J = 5, K_a = 0, K_c = 5$ to $J = 6, K_a = 2, K_c = 4$ rotational transition of the 1$_0^1$3$_0^1$ vibrational transition of H$_2$O near 7511.29 cm$^{-1}$ were monitored. The results indicated that the RWGS reaction promoted the conversion of CO$_2$ and decreased the partial pressure of hydrogen. Our CEAS result confirms that the conversion of CO$_2$ is always 3-5\% higher than CH$_4$ due to RWGS reaction. In addition, the effect of reaction temperature on RWGS was studied. The work described here was supported by a grant from the Research Grants Council of Hong Kong SAR, China (Project No. HKU7101/02P)
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Author Institution: Department of Chemistry, Tianjin University, Tianjin 300072, P.R. China and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong; Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong; Department of Chemistry and Center for Surface Analysis and; Research, Hong Kong Baptist University, Kowloon Tong, Hong Kong