不同硅铝比缺陷型HZSM-5沸石物化性质的表征  

Characterization of Physicochemical Properties of Defective HZSM-5 Zeolites With Different SiO_(2)/Al_(2)O_(3) Ratios

作　　者：林龙[1] 邵旭 王吉垒 李佩儒[1] LIN Long;SHAO Xv;WANG Ji-lei;LI Pei-ru(Sinopec Maoming PetrochemicaL Branch Company,Maoming Guangdong 525011,China;Fuxin Industrial Technology Innovation Promotion Center,Fuxin Industrial Technology Research Institute,Fuxin Liaoning 123000,China)

机构地区：[1]中国石油化工股份有限公司茂名分公司,广东茂名525011 [2]阜新市产业技术创新推广中心,阜新市产业技术研究院,辽宁阜新123000

出　　处：《当代化工》2023年第5期1080-1083,共4页Contemporary Chemical Industry

基　　金：国家自然科学基金,木质素碳基吸波材料设计合成与强化损耗机制研究(项目编号:22178037)。

摘　　要：ZSM-5沸石普遍存在不同程度的骨架缺陷,这些骨架缺陷会使ZSM-5沸石产生不同数量和形式的羟基窝缺陷位,然而关于羟基窝对缺陷型ZSM-5沸石物化性质(包括结晶度、亲水性、孔结构、酸性等)影响的研究却鲜有报道。因此,选用4种不同硅铝比的缺陷型HZSM-5沸石(300 nm,硅铝比为55、100、480、950)和六氟硅酸铵((NH_(4))_(2)SiF_(6))修复上述缺陷型HZSM-5沸石得到的参比样品,围绕沸石结晶度、亲水性、孔结构和酸性等基本物化性质开展系统的表征研究,考察缺陷型ZSM-5分子筛的羟基窝对其物理化学性质的影响。研究结果表明:缺陷型ZSM-5沸石具有大量的羟基窝缺陷,羟基窝缺陷位对ZSM-5沸石的物化性质具有较大影响。相比于常规ZSM-5沸石,缺陷型ZSM-5沸石具有更多的弱酸性位、更大的孔体积和比表面积。ZSM-5 zeolite generally has different degree of skeleton defects,which will produce different number of hydroxyl nests defect sites.However,the study on the physicochemical properties(crystallinity,hydrophilicity,pore structure,acidity)of the defective ZSM-5 zeolite was seldom reported.Therefore,four as-synthesized defective HZSM-5 zeolites with SiO_(2)/Al_(2)O_(3) ratio of 55,100,480 and 950,and reference samples obtained by repairing these defective zeolites with ammonium hexafluorosilicate((NH_(4))_(2)SiF_(6)),were systematically characterized including crystallinity,hydrophilicity,pore structure,acidity and other basic physicochemical properties.Results showed that all the defective HZSM-5 zeolites were rich in hydroxyl nests defects.The hydroxyl nests defects had a great influence on the physicochemical properties of HZSM-5 zeolite.Compared with the reference zeolites,the defective HZSM-5 zeolites had more weak acid sites,bigger pore volume and larger specific surface area.

关 键 词：ZSM-5分子筛 硅铝比 骨架缺陷 羟基窝 催化作用 

分 类 号：O643.36[理学—物理化学]