SSZ-13分子筛上甲醇转化过程中甲氧基物种的生成与活性研究

覃瑞,王超,王强,胡敏,李金林,徐君,邓风

Formation and Reactivity of Surface Methoxy Species in Methanol Conversion over SSZ-13 Zeolite

Rui QIN,Chao WANG,Qiang WANG,Min HU,Jin-lin LI,Jun XU,Feng DENG

图3 SSZ-13分子筛上13C甲醇在250 ℃温度下反应1 min后残留物的2D 13C-27Al HMQC NMR谱.虚线框标记的交叉峰信号为27Al维的四极展宽信号.右图为Brønsted酸位以及Lewis酸位上形成的表面甲氧基物种结构示意图

Fig.3 2D 13C-27Al HMQC NMR spectrum of trapped products obtained from reaction of 13C-methanol over SSZ-13 at 250 ℃ for 1 min. The cross-peak framed by dotted lines is originated from the quadrupole broadening of tetrahedral Al in the 27Al dimension. Schematic models of the methoxy species formed on Brønsted site (SMS-B) and Lewis site (SMS-L) are shown in the right panel