P-HZSM-5催化剂上合成对异丙基苯酚的研究

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

Studies on Synthesis of para-Isopropylphenol over the P-HZSM-5 Catalyst

Alkylation of phenol with isopropanol to \%para\%\|isopropylphenol(\%p\%\|IPP) over \{P\|HZSM\|5\} catalyst has been studied. The influence of phosphorus modification on catalytic performance of HZSM\|5 has been investigated. The acidic site density and acid types were determined by means of NH\-3\|TPD and Pyr\|IR. The selectivity of \%p\%\|IPP increased to 95% while the conversion of phenol and the acidic site density decreased on the HZSM\|5 after modified with NH\-4H\-2PO\-4. In the preparation of P\|HZSM\|5, it appeared that there was an interaction between phosphorus and HZSM\|5 zeolite, which resulted in framework dealumination on HZSM\|5, and calcination influenced both activity and \%p\%\|IPP selectivity. The selectivity of P\|HZSM\|5 reached the highest when the support and the catalyst were calcined at \{973 K\} and 823 K, respectively.