Study on the Synthesis of Methanol by Carbon Dioxide Hydrogenation over CuO-ZnO/ZrO_2 Catalyst

A CuO-ZnO/ZrO2catalyst was prepared by concurrent coprecipitation.The effects of reaction temperature,pressure and feed gas space velocity on the catalytic performances of the catalyst for the synthesis of methanol by carbon dioxide hydrogenation as well as the activity stability of the catalyst were investigated.With a certain feed gas composition,the optimum reaction parameters were determined as follows: reactiontemperature of 250℃,reaction pressure of 2.0MPa,and feed gas space velocity of 1600h-1.Under the optimum conditions,the conversionof carbon dioxide and the selectivity to methanol were23.1% and50.2%,respectively.The conversion of carbon dioxide was still over 20% in the fifth reuse of the catalyst,sothe activity of the catalystwasstable.