SAPO-11分子筛改进合成及正十二烷加氢异构化性能

Improved Synthesis of SAPO-11 and Their n-Dodecane Hydroisomerization Properties

用二乙胺作模板剂 ,在较短晶化时间的水热条件下合成出不同Si Al比的SAPO 11样品 .Si Al比升高 ,结晶度下降 ,晶粒变小 .2 9SiNMR谱表明Si Al比为 0 .33的SAPO 11的SAPO区与Si区的交界区明显扩大 ,与之对应的NH3 TPD也表明有较高的中强酸 弱酸比例 .样品担载Pd后对正十二烷的加氢异构化反应表明 ,交界区扩大的Si Al=0

Different Si/Al SAPO-11 were synthesized in short crystallizing time under hydrothermal condition with diethylamine as template. XRD spectra show that crystallinity and SAPO-11 size decrease with increasing Si/Al ratio. 29Si NMR spectra indicate that SAPO-11 sample with an Si/Al of 0.33 significantly enhances the neighboring region between SAPO region and Si region, and NH 3-TPD results also show it has higher strong acid/weak acid ratio. Impregnated by Pd, the Si/Al 0.33 sample with enhanced neighboring region has the highest n-dodecane hydroisomerization conversion and selectivity.