通常认为丝光沸石是具有一维孔道结构的微孔沸石,在涉及大分子的催化反应中存在较为严重的扩散限制.以双季铵型表面活性剂C18H37N+(CH3)2C6H12N+ (CH3)2C6H13(Br)2(C18-6-6Br2)作为软模板,在水热条件下制备了多级孔丝光沸石分子筛.采用XRD、FT-IR、SEM、TEM、TG-DTG、N2物理吸附、NH3-TPD等手段对样品的晶体结构和物化性能进行了表征.结果表明,加入C18-6-6Br2制备了纳米棒定向排列的多级孔丝光沸石,而且可通过改变合成体系中C18-6-6Br2/SiO2的比值,对样品的晶粒尺寸、介孔表面积和介孔孔容进行系统调变.在苯与苯甲醇的苄基化反应中,多级孔样品比传统微孔丝光沸石表现出更好的苄基化反应催化性能和显著提高的反应速率.多级孔丝光沸石优异的催化性能归因于介孔的存在使其具有更多的可接近活性位和更优异的质量传输性质,这种独特的多级孔丝光沸石在大分子催化转化反应中具有较大的应用潜力.
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