SAPO-11分子筛的合成及反应温度对其催化性能的影响  

Synthesis of SAPO-11 molecular sieve and effect of reaction temperature on catalytic performance

作　　者：张利霞[1] 任行涛[1] 杨光[1] 刘艳惠[1] 裴庆君[1] 

机构地区：[1]中国石油化工股份有限公司北京北化院燕山分院橡塑新型材料合成国家工程研究中心,北京102500

出　　处：《现代化工》2015年第2期99-101,共3页Modern Chemical Industry

摘　　要：采用水热合成法合成SAPO-11分子筛,通过XRD和SEM对其进行表征得到样品的晶相结构和微观形貌。采用NH3-TPD对样品的酸性进行了测定。用BET方法对催化剂的比表面积和孔容进行了测试。以醚后混合碳四为原料在固定床微型反应器上考察了反应温度对SAPO-11分子筛的催化性能影响。不同反应温度SAPO-11分子筛的正丁烯异构化的反应性能评价结果表明,通过延长反应时间,在反应一定时间后活性趋于稳定而后逐渐降低,适当升温可以提高异丁烯的选择性,当反应温度提高至380℃后,正丁烯转化率和异丁烯选择性都有所降低,说明催化剂已经失活,不能再通过提高反应温度来提高催化剂的活性,此时需对催化剂进行再生。SAPO-11 molecular sieve is synthesized by hydrothermal method. X-ray diffraction （XRD） and scanning electron microscopy （SEM） are used to characterize the crystal and microstructure of the obtained SAPO-11 molecular sieve. NH3-TPD is used to determine the acidity. BET is employed to evaluate the specific surface area and hole volume. The effect of reaction temperature on the catalytic performance of SAPO-11 molecular sieve is studied on a packed bed microreactor by using etherified C4 as raw materials. The results show that increasing the reaction temperature, the catalytic reactivity increases at first after a certain reaction time, and then decreases gradually. The appropriate increase in the reaction temperature leads to the increase of the selectivity of iso-butylene. When the reaction temperature is above 380℃ ,the seleetivities of n-butylene and iso-butylene both decrease, indicating the deactivation of the catalyst. It suggests that the regeneration is needed to be carried out to improve the catalytic performance.

关 键 词：SAPO 分子筛 合成 异构化 催化剂 

分 类 号：O643.36[理学—物理化学]