SO_4~(2-)/ZrO_2固体超强酸催化剂上的酯化反应机理 |
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引用本文: | 任立国,高文艺,张晓丽. SO_4~(2-)/ZrO_2固体超强酸催化剂上的酯化反应机理[J]. 辽宁石油化工大学学报, 2003, 23(1): 33-36 |
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作者姓名: | 任立国 高文艺 张晓丽 |
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作者单位: | 辽宁石油化工大学石油化工学院,辽宁抚顺,113001 |
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摘 要: | 与液体酸和酸性树脂催化剂相比,固体超强酸催化剂具有许多优点,如无腐蚀性、不污染环境、易与产物分离和重使用性等。通过沉淀、老化、过滤、洗涤、干燥、浸渍、焙烧等过程,从ZrOCl2·8H2O和(NH4)2SO4制备了SO42-/ZrO2固体超强酸催化剂;使用Hammett指示剂法和吡啶吸附的FT-IR光谱法测定了其酸强度和酸中心类型;以甲醇、乙酸和乙酸乙酯吸附在SO42-/ZrO2固体超强酸催化剂上的FT-IR光谱,推测酯化反应机理。结果表明,当焙烧温度高于500℃,SO42-/ZrO2可以形成超强酸,其表面上同时存在Lewis酸和Bronsted酸中心;在SO42-/ZrO2固体超强酸催化剂上,酯化反应既可以在Lewis酸中心进行,也可以在Bronsted酸中心上进行。
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关 键 词: | 固体超强酸 酸性 酯化反应 反应机理 |
文章编号: | 1005-3883(2003)01-0033-04 |
修稿时间: | 2002-04-10 |
Esterification Reaction Mechanism on the Surface of SO42-/ZrO2 Solid Superacid Catalysts |
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Abstract: | Compared to liquid acids and acidic resins,solid superacid catalysts has many advantages(such as non-corrosion, non-polluting enviroment, easy of separation and reusability etc.). The SO42-/ZrO2 solid superacid catalysts was prepared from ZrOCl2·8H2O and(NH4)2SO4 by precipitation, aging, filtering, washing,maceration and calcination processes. Their acidities were determined by Hammett indicators and FT-IR spectroscopy of pyridine adsorption methods. The reaction mechanism were determined with FT-IR spectroscopy of methanol,acetic acid,acetic ester on the SO42-/ZrO2 solid superacid catalyst. The results show that the SO42-/ZrO2 solid superacid was formed when calcination temperatures was higher than 500 ℃ and their surfaces has Lewis and Bronsted acidic centers; the estreification takes place not only on the Bronsted acidic centers but also on the Lewis acidic centers of the SO42-/ZrO2 solid superacid catalyst. |
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Keywords: | Solid superacid Acidities Estreification Reaction mechanism |
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