A series of ZnGaO catalysts with different zinc/gallium ratio were prepared by co-precipitation. The catalysts show good activity for DME SR, especially the one with Zn:Ga=9:1. All catalysts possess less than 5% CO selectivity in the whole reaction temperature range, except the one with Zn:Ga=7:3(Figure 1). The XRD, EXAFS and TEM results show that our catalysts consist of zinc and gallium oxides, showing special morphology. The CH3OH-TPD-MS signals of H2 and CO2 prove that the catalyst with Zn:Ga=9:1 displays the lowest H2 and CO2 desorption temperature (314oC and 324oC, respectively).The CO-TPD-MS and the in-situ FT-IR exhibit the prepared ZnGaO catalysts can readily transform CO to CO2, exhibiting low CO selectivity.The best performance of the sample with Zn:Ga=9:1 is related to its good capability for CH3OH adsorption, CO adsorption and oxidation, as well as the lowest Ea and highest TOF (Table 1).

Low CO selectivity of copper-free ZnGaO catalysts used for dimethyl ether reforming to produce H2

249th National Meeting (2015)

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