Study on Synthesis of SAPO-34 Molecular Sieve Using Composite Template TEAOH-Morpholine ⅱ. Surface Acidity and Catalytic Performance of SAPO-34 Molecular Sieve 用TEAOH-C4H9NO复合模板剂合成SAPO-34分子筛的研究Ⅱ.SAPO-34分子筛的表面酸性和催化性能
Latest researches in SAPO-18 molecular sieve were reviewed with respect to its synthesis, structure, acidity and application in methanol-to-olefins ( MTO) process. 介绍了SAPO-18分子筛的合成、结构组成、酸性表征及其在催化甲醇制烯烃(MTO)反应中应用的最新研究情况。
Latest researches in SAPO 34 molecular sieve were reviewed with respect to its synthesis, structure, acidity, thermal stability, hydrothermal stability and its application in MTO. The influence factors in the synthesis of SAPO-34 molecular sieve and its application in MTO were discussed. 综述了SAPO-34分子筛在合成、结构、酸性、热稳定性及水热稳定性等物化表征方面以及在MTO反应中应用的研究近况,重点介绍了SAPO-34分子筛合成及其在MTO反应中应用的影响因素。
The character of nitric's molecular structure determines that it can separate completely in solution, so the nitric has strong acidity; according to its standard potential electrode, the teacher and students can judge it can be oxidized. 硝酸的分子结构特征,决定了硝酸在水溶液中能完全电离,所以硝酸具有强酸性,根据硝酸的标准电极电势,师生可推断出硝酸又具有氧化性。
The modification of mesoporous molecular sieve can be performed by the incorporation of metal atom into the silica framework, which can change its acidity and improve its acidic sites amount. 将一些金属原子引入介孔分子筛的硅基骨架对其进行掺杂改性,可以改变其酸量、增加酸中心的数量。
SAPO-34 is molecular sieve with the framework topology of the natural zeolite chabazite with narrow diameter pores of 0.38 nm, moderate acidity and excellent thermal stability and hydrothermal stability, which is an excellent catalyst for many important reactions. SAPO-34分子筛具有类菱沸石结构,孔径大小为0.38nm,具有中等酸性以及良好的热稳定性和水热稳定性,在许多反应中表现为性能优良的催化剂。
The application of the pure silica mesoporous molecular sieve was limited in adsorption, catalysis and petrochemical industry because it possesses some disadvantages such as a neutral framework, the poor thermal and hydrothermal stabilities, low catalytic activity and weak surface acidity. 由于纯硅基介孔分子筛具有中性骨架、较差的热和水热稳定性、催化活性低以及弱的表面酸性等缺点,限制了其在吸附、催化及石油化工中的应用。
NH3 was selected as alkaline probe molecular to examine its acidity. 以NH3作碱性探针分子来考察其酸性。