论文部分内容阅读
研究了在Ｐ－ＨＺＳＭ－５ 上苯酚与异丙醇烷基化合成对异丙基苯酚（ｐ－ＩＰＰ）的反应， 考察了磷含量对催化反应性能的影响， 用ＮＨ３－ＴＰＤ和Ｐｙｒ－ＩＲ表征了Ｐ－ＨＺＳＭ－５ 的表面酸性质． 结果表明， 磷改性ＨＺＳＭ－５ 可提高ｐ－ＩＰＰ选择性（达９５％ ）， 而降低了苯酚的转化率， 并导致酸量减少和酸强度减弱． 磷与分子筛的相互作用引起了分子筛脱铝． 焙烧温度对活性和选择性均有影响． 分子筛在９７３ Ｋ、Ｐ－ＨＺＳＭ－５ 在８２３ Ｋ焙烧时， ｐ－ＩＰＰ选择性最高
The reaction of p-IPP with p-IPP by alkylation of phenol and isopropanol on P-HZSM-5 was investigated. The effect of phosphorus content on the catalytic performance was investigated. The effects of NH3-TPD and Pyr- The surface acid properties of P-HZSM-5 were characterized. The results show that phosphorus-modified HZSM-5 can increase the selectivity of p-IPP (up to 95%), and reduce the conversion of phenol, resulting in the decrease of acid amount and acid strength. The interaction of phosphorus with molecular sieves causes the dealumination of molecular sieves. The calcination temperature has an influence on the activity and the selectivity. Molecular sieves at 973 K, P-HZSM-5 at 823 K roasting, the highest p-IPP selectivity