摘要
HZSM-5分子筛经不同温度焙烧得到系列样品。其固体高分辨^(27)Al NMR谱显示了骨架四配位铝的数量变化。用吸附苯和Cu(Ⅱ)固态交换样品的EPR方法以及NaCl反交换法测定了分子筛上L酸和B酸中心数量的相应变化。考察了该系列样品对苯和NO_2气相反应的催化活性。
A series of HZSM-5 zeolite samples were prepared by calcination at different temperatures. The high resolution solid state 27Al NMR was used to determine the change of the amount of framework tetrahedral Al. The change of the amount of B and L acid sites of zeolite was measured by EPR spectroscopy after adsorption of benzene vapor and after solid-state exchange with Cu(Ⅱ), the results were in agreement with those determined by inverse exchange with NaCl solution. The influence of the calcination temperature on the catalytic activity of zeolite for the vapor phase reaction of benzene with nitrogen dioxide was investigated and discussed.
基金
国家自然科学基金
