图6. Cu2+部分交换Na-SSZ-39(14)分子筛的(a)一维23Na MAS NMR谱与(b)二维23Na MQ MAS NMR谱
Fig.6. (a) 1D 23Na MAS NMR spectra and (b) 2D 23Na MQ MAS NMR spectrum of Cu2+ partially exchanged Na-SSZ-39(14) zeolite