Abstract
The adsorption of CO, CO 2, H 2, HCOOH, and CH 3OH was studied over ZrO 2 using FTIR. Bicarbonate, formate, and methoxide species were observed. Bicarbonate was the major species formed from CO 2 and was converted into formate in the presence of sufficient hydrogen. Formate was observed following CO adsorption even in the absence of hydrogen. The formate was reduced to methoxide in the presence of hydrogen. The different behavior for CO/H 2 and CO 2/H 2 demonstrated that different mechanisms should be proposed for CO versus CO 2 hydrogenation over ZrO 2. Formate to methoxide conversion was reversible. Experiments conducted with D 2O revealed that surface OH (OD) groups participate in formate formation and in formate to methoxide conversion.
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