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五配位铝强化硅铝固体酸的固体核磁共振研究
王子春1,黄骏2,姜怡娇1,*()
Solid-State NMR Spectroscopy Studies of Enhanced Acidity of Silica-Aluminas Based on Penta-Coordinated Aluminum Species
Zi-chun WANG1,Jun HUANG2,Yi-jiao JIANG1,*()

图3. 27Al-{1H}二维异核多量子相关谱（D-HMQC）.(a) SA/50在723 K下真空脱水12 h；(b)脱水SA/50吸附氨探针分子，并在373 K下脱附1 h[7].相应谱图在18.8 T下采集，相应参数为νR=20 kHz，脱水样品的τrec=1.0 ms，吸氨样品的τrec=900 μs

Fig.3. 27Al-{1H} D-HMQC 2D spectra of SA/50. (a) SA/50 dehydrated at 723 K for 12 h under vacuum, and (b) after ammonia loading and evacuated at 373 K for 1 h. The spectra were recorded at 18.8 T with a MAS frequency of νR=20 kHz, and τrec=1.0 ms for dehydrated and τrec=900 μs for ammonia-loaded sample, respectively[7]