理论研究吸附-扩散在H-MOR和Pyridine预吸附的H-MOR的二甲基乙醇碳化
Jiabao Zhao1, Weixin Qian1, Hongfang Ma1
1Engineering Research Centre of Large Scale Reactor Engineering and Technology, Ministry of Education, State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China.
将皮里丁添加到摩登石 (H-MOR) 中可以通过改善反应剂吸附和催化剂稳定性来增强二甲基乙烯 (DME) 碳化. 这种胺基改性催化剂 (H-AlMOR-Py) 降低了所需的CO/DME料比率,降低了原材料消耗.
科学领域:
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 甲基乙醇 (DME) 碳化是生产有价值化学品的关键过程.
- 摩登石 (H-MOR) 是一种广泛使用的催化剂,但其寿命可能是有限的.
- 皮里丁前吸附被探索为一种提高H-MOR性能的策略.
研究的目的:
- 调查胺前吸附对H-MOR中反应物和产品的吸附和扩散行为的影响.
- 了解皮里丁修饰如何影响DME碳化的活性位点和整体催化性能.
- 评估胺修饰的H-MOR (H-AlMOR-Py) 提高催化剂寿命和工艺效率的潜力.
主要方法:
- 使用蒙特卡洛和分子动力学的模拟在周期模型 (H-AlMOR和H-AlMOR-Py) 上进行.
- 分析重点关注一氧化碳 (CO),甲基 (MA) 和水 (H2O) 的吸附稳定性,密度和扩散.
- 评估所需的反应剂料比率,以实现DME碳化的理论摩尔比率.
主要成果:
- 皮里丁预吸附增加了CO吸附稳定性,并在8个环 (8-MR) 活性位点中增加了缩的CO.
- 在12个环 (12-MR) 中,产品甲基 (MA) 和副产品H2O的吸附在H-AlMOR-Py.上显著降低.
- 所需的CO/DME料比率从H-AlMOR上的50:1降低到H-AlMOR-Py.的10:1.
结论:
- 在H-MOR上化的预吸附通过改善CO吸附和促进产品/副产品脱吸,增强DME碳化.
- 证实H-MOR的8-MR是主要活性位点,并且胺有效地将反应物集中在那里.
- H-AlMOR-Py提供了更好的吸附平衡,增加了活性点的二氧化碳度,减少了原材料消耗,延长了催化剂寿命.
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