MECHANISM OF REACTION OF METHANOL AND ISOBUTENE OVER ZEOLITE HBT6

LI Yonghong; YU Shaobing; HAN Sen; CHEN Hongfang; MIN Enze

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MECHANISM OF REACTION OF METHANOL AND ISOBUTENE OVER ZEOLITE HBT6

更新时间：2025-12-10

- MECHANISM OF REACTION OF METHANOL AND ISOBUTENE OVER ZEOLITE HBT6
- CIESC Journal Issue 4, (2001)
- 作者机构：
  
  1. 天津大学一碳化工国家重点实验室
  2. 石油化工科学研究院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 April 2001，
  
  Published：25 April 2001
- 稿件说明：
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LI Yonghong, YU Shaobing, HAN Sen, et al. MECHANISM OF REACTION OF METHANOL AND ISOBUTENE OVER ZEOLITE HBT6[J]. CIESC Journal, 2001, (4).
DOI：

LI Yonghong, YU Shaobing, HAN Sen, et al. MECHANISM OF REACTION OF METHANOL AND ISOBUTENE OVER ZEOLITE HBT6[J]. CIESC Journal, 2001, (4). DOI：

摘要

研究了甲醇、异丁烯和甲基叔丁基醚 (MTBE)在HBT6分子筛上的吸附

探讨了HBT6分子筛催化剂上合成MTBE反应的机理

并结合本征动力学实验结果

提出了反应的机理动力学模型 .结果表明

甲醇、异丁烯、MTBE均吸附在催化剂的酸性OH基上

其中异丁烯主要以π络合形式吸附

这种吸附态容易转变为叔丁基正碳离子 .甲醇与异丁烯在HBT6分子筛催化剂上的醚化反应按照L -H机理进行

表面反应为速度控制步骤

Abstract

The adsorption of methanol

isobutene and MTBE on zeolite HBT6 was investigated using IR spectroscopy. The mechanism of synthesis of MTBE from methanol and isobutene over zeolite HBT6 was studied based on adsorptive states of reactants and product over the catalyst and intrinsic kinetic experiments. Methanol

isobutene and MTBE were probably adsorbed on OH groups of the zeolite

and adsorbed isobutene molecules were π-complexes which could

easily

turn into tertiary butyl C +. Reaction of methanol with isobutene over the zeolites takes place according to the L-H mechanism and the rate-determining step is the reaction of adsorbed methanol with adsorbed isobutene. TPD following adsorption showed that some of the methanol molecules were strongly adsorbed on the catalyst. It might be a disadvantageous factor.

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