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采用乙醇脱水生成气态乙烯,使用微型反应装置与色谱联用的方法对ZSM-5分子筛催化剂的性能进行评价,探讨了温度、进料速率对催化剂的活性和选择性的影响。结果表明,分子筛催化剂在乙醇脱水反应中比氧化铝具有更低的反应温度、更高的操作空速和更高的单程反应转化率和乙烯收率。特别是ZSM-5分子筛催化剂因其具有亲油疏水性,在催化脱水性能方面更具有优势。反应的最佳温度为340℃,最佳进料速率为0.4mL/min。反应的瞬时转化率随温度的升高而升高,随进料速率的增加而降低;反应的转化速率及催化剂的瞬时选择性随温度的升高而升高,随进料速率的增加而增加。
The effect of temperature and feed rate on the activity and selectivity of ZSM-5 zeolite catalysts was evaluated by using ethanol dehydration to form gaseous ethylene. The performance of ZSM-5 zeolite catalysts was evaluated by using microreactor and chromatography. The results show that the molecular sieve catalyst has lower reaction temperature, higher operation space velocity and higher one-way reaction conversion and ethylene yield than the alumina in the ethanol dehydration reaction. In particular, ZSM-5 zeolite catalysts are more advantageous in catalytic dehydration performance due to their lipophilic and hydrophobic properties. The optimal reaction temperature was 340 ℃, the optimal feed rate was 0.4mL / min. The instantaneous conversion rate of the reaction increased with the increase of the temperature and decreased with the increase of the feed rate. The conversion rate of the reaction and the instantaneous selectivity of the catalyst increased with the increase of the temperature and increased with the increase of the feed rate .