Effects of various factors on the reaction conversion were calculated by theapplication of self-progranund software and thermodyntalc data; Activities and selectiv-ities of various ZnO/silica-based catalysts were compared; Reaction mechhasm based onthermodyntalc equilibrium and products distribution of the reactions was also discussed Effects of various factors on the reaction conversion were calculated by the application of self-progranund software and thermodyntal data; Activities and selectiv-ities of various ZnO / silica-based catalysts were compared; Reaction mechhasm based onthermodyntalc equilibrium and products distribution of the reactions was also discussed