摘要
研究了分子筛催化剂上苯胺与异丙醇合成对异丙基苯胺的反应，得到了较佳的反应条件：反应温度６２３Ｋ～６４３Ｋ，空速１．０～１．３ｈ１，苯胺／异丙醇摩尔比１．０～２．０。ＨＺＳＭ５分子筛经高温焙烧、水蒸气处理和氧化物改性后对异丙基苯胺选择性均有提高；经适当温度（１０２３Ｋ焙烧，７２３Ｋ水蒸气处理）处理其活性有一最佳值。以ＢＥＴ重量法测定了高温焙烧后ＨＺＳＭ５环己烷的吸附等温线表征其孔径大小，通过ＮＨ３ＴＰＤ和吸附吡啶的ＩＲ等手段表征了催化剂的表面酸性质，与反应结果相关联发现：强酸中心不利于反应活性及对异丙基苯胺选择性。
The alkylation of aniline with isopropanol to synthesize pisopropylaniline(p-IPA) on zeolite catalysts has been studied Calcination and hydrothermal treatment were adopted to treat HZSM5 The properties of catalysts were evaluated in the fixed bed flow reactor under atmospheric pressure The surface acidity was measured by means of NH 3TPD and pyridineadsorbed IR The relative pore size of HZSM5 was determined by cyclohexane adsorbance The selectivity of pIPA on HZSM5 is higher than that on other zeolites The optimum conditions are: temperature 623～643K, WHSV 1 0￣1 3h 1 , aniline/isopropanol(mol/mol)1 0￣2 0 The selectivity of pIPA is increased by calcination, steaming and oxide modification of HZSM5 There is higher conversion of aniline at moderate calcination temperature (about 1023K) and steaming temperature (about 723K) Acidic amount, distribution of acidic strength, acidic type and pore size influence the selectivity of pIPA and aniline conversion The strong acidic centers do not benifit the conversion of aniline and the selectivity of pIPA The weaker Br o ¨nsted acid are main active centers for synthesis of pisopropylaniline
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1998年第6期526-531,共6页
Journal of Fuel Chemistry and Technology
基金
国家重点自然科学基金
关键词
对异丙基苯胺
分子筛
催化剂
苯胺
烷基化
zeolite catalysts, isopropylaniline, aniline alkylation, modification
