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OALib Journal期刊
ISSN: 2333-9721
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含硼杂原子na-b-zsm-5分子筛对甲醇脱氢制甲醛反应的催化性能
, PP. 616-624
Keywords: 含硼zsm-5分子筛,水热合成,催化活性,甲醇脱氢,甲醛
Abstract:
？以白炭黑为硅源、硼酸为硼源、naoh为碱源、四丙基溴化铵（tpabr）和1，6-己二胺（hmda）混合模板剂，采用水热合成法制备含硼杂原子na-b-zsm-5分子筛，用xrd、sem、ft-ir、uv-vis、11bmasnmr、nh3-tpd等方法对其进行表征。在连续流动常压固定床反应器上评价na-b-zsm-5分子筛对甲醇脱氢制甲醛反应的催化性能，考察n（si）/n（b）、n（na2o）/n（sio2）、晶化温度和晶化时间等制备参数以及反应温度和质量空速等工艺参数对催化性能的影响。结果表明，硼进入了分子筛的骨架结构中，存在与b酸中心有关的骨架四配位硼和与l酸中心有关的骨架三配位硼，na-b-zsm-5分子筛含有较多的弱酸位和少量的中强酸位。催化剂的最佳制备参数为n（si）/n（b）比值为7.5、n（na2o）/n（sio2）比值为0.14、晶化温度170℃、晶化时间48h。na-b-zsm-5（7.5）分子筛在反应温度550℃、质量空速1.85h-1的反应条件下对甲醇的转化率为62.97%，甲醛的选择性为68.86%。
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