Study on water―gas shift reaction performance using Pt-based catalysts at high temperatures

The water-gas shift reaction (WGSR) performance was experimentally studied using Pt-based catalysts for temperature, time factor and steam to carbon (S/C) molar ratio at ranges of 750-850 degree C, 10-20 g sub(cat) h/mol sub(CO), and 1-5, respectively. Al sub(2)O sub(3) spheres were used as the catalyst support. For the high S/C cases, it was found that CO conversion can be enhanced when Pt/CeO sub(2)/Al sub(2)O sub(3) catalyst was used as compared with Pt/Al sub(2)O sub(3). For the low S/C ratio cases, CO conversion enhancement was not significant with the addition of CeO sub(2). It was also found that CO conversion was not influenced by the CeO sub(2) amount to a large extent. Using bimetallic Pt-Ni/CeO sub(2)/Al sub(2)O sub(3) catalyst, it was found that higher CO conversion can be obtained as compared with CO conversions obtained from monometallic catalysts (Pt/Al sub(2)O sub(3) or Pt/CeO sub(2)/Al sub(2)O sub(3)). The experimental data also indicated that good thermal stability can be obtained for the Pt-based catalysts studied.