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Zirconia catalysts doped with Si were prepared by co-precipitation method. The effects of zirconium precursor, precipitant and Si on the selective conversion of ethanol to ethylene over zirconia catalysts were investigated. The addition of Si afforded high surface area and enlarged amount of acidic sites. Higher ethanol conversion and ethylene yield were obtained over SiO2–ZrO2 catalysts. The highest...
The selectivity of propylene was constant at 20% during continuous experiments for 8 h on HZSM-5. However, HLEV catalysts produced almost no C3H6 after 2 h. The rapid change is probably due to coke deposition. Excessive adsorption of ethanol on HLEV leads to coke deposition. Lower adsorption energy of ethylene on HLEV makes ethylene desorb quickly after formation. Graphical Abstract
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