Development of a combined catalyst and sorbent for the water gas shift reaction

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Date
2014-01-01
Authors
Kong, Meng
Albrecht, Karl
Shanks, Brent
Wheelock, Thomas
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Abstract

A combined catalyst and sorbent was developed for reacting CO with steam to produce H2 in a single reaction stage at 600 °C by employing the water gas shift (WGS) reaction. The combined material was in the form of spherical pellets where each pellet consisted of a CaO core for absorbing byproduct CO2 surrounded by a porous shell of Al2O 3 which supported a Ni catalyst. The best results were achieved by incorporating 5 wt % limestone in the shell material to suppress coking. By employing the best core-in-shell pellets and supplying a 3:1 mol ratio of steam to CO at 600 °C, more than 97% of the CO was converted to H2 by the WGS reaction and less than 1% was converted to CH4 by a side reaction. Also, none of the CO was converted to coke.

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Reprinted (adapted) with permission from Industrial and Engineering Chemistry Research 53 (2014): 9570, doi: 10.1021/ie402607a. Copyright 2014 American Chemical Society.

Keywords
carbon dioxide, catalysts, chemical shift, porous shells, shell materials, side reactions, spherical pellets, water gas shift (WGS) reaction
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