摘要
本文使用固体核磁共振(NMR)技术研究了SSZ-13分子筛上甲醇制烯烃反应过程中表面甲氧基物种的生成以及反应活性.通过二维^(13)C-^(27)Al HMQC NMR方法确证了甲醇在分子筛骨架Brønsted酸位上生成的甲氧基物种,以及在Lewis酸位上生成的另外一种表面甲氧基物种.^(13)C NMR结合气相色谱-质谱(GC-MS)实验结果表明,这两种甲氧基物种在甲醇制烯烃反应中均具有较高的反应活性,既可以导致烃池物种的生成,也可以参与烃池反应生成碳氢化合物.
The formation and reactivity of surface methoxy species in methanol reaction over SSZ-13 zeolite were investigated by using solid-state nuclear magnetic resonance(NMR)technique.The surface methoxy species bound to Brønsted acid sites was identified by two-dimensional ^(13)C-^(27)Al heteronuclear multiple quantum coherence(HMQC)NMR experiment.The formation of another surface methoxy species bound to Lewis acid sites was also observed.The combination of ^(13)C NMR and gas chromatography-mass spectrometry(GC-MS)showed that the two kinds of surface methoxy species possess high reactivity,contributing to the formation of hydrocarbon pool species and hydrocarbons via the hydrocarbon pool mechanism.
作者
覃瑞
王超
王强
胡敏
李金林
徐君
邓风
QIN Rui;WANG Chao;WANG Qiang;HU Min;LI Jin-lin;XU Jun;DENG Feng(Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education&Hubei Key Laboratory of Catalysis and Materials Science,South-Central Minzu University,Wuhan 430074,China;National Center for Magnetic Resonance in Wuhan,State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Wuhan Institute of Physics and Mathematics,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《波谱学杂志》
CAS
北大核心
2022年第4期439-447,共9页
Chinese Journal of Magnetic Resonance
基金
国家自然科学基金资助项目(22072165,21991092,U1932218,21733013,22061130202)
湖北省自然科学基金资助项目(2021CFA021).
关键词
SSZ-13分子筛
固体核磁共振
甲醇转化
表面物种
反应机理
SSZ-13 zeolite
solid-state nuclear magnetic resonance
methanol conversion
surface species
reaction mechanism
