空间位阻对吡啶过度修饰导致丝光沸石二甲醚羰基化酸性位中毒后再生的诱导作用

引用本文: 赵娜, 田野, 张丽芙, 程庆鹏, 吕帅帅, 丁彤, 胡振芃, 马新宾, 李新刚. 空间位阻对吡啶过度修饰导致丝光沸石二甲醚羰基化酸性位中毒后再生的诱导作用[J]. 催化学报, 2019, 40(6): 895-904. doi: S1872-2067(19)63335-8 shu

Citation: Na Zhao, Ye Tian, Lifu Zhang, Qingpeng Cheng, Shuaishuai Lyu, Tong Ding, Zhenpeng Hu, Xinbin Ma, Xingang Li. Spacial hindrance induced recovery of over-poisoned active acid sites in pyridine-modified H-mordenite for dimethyl ether carbonylation[J]. Chinese Journal of Catalysis, 2019, 40(6): 895-904. doi: S1872-2067(19)63335-8 shu

空间位阻对吡啶过度修饰导致丝光沸石二甲醚羰基化酸性位中毒后再生的诱导作用

a 天津大学化工学院, 天津化学化工协同创新中心, 天津 300072;
b 天津大学化工学院, 天津市应用催化科学与工程重点实验室, 天津 300072;
c 南开大学物理学院, 天津 300072;
d 天津大学化工学院, 教育部绿色化学技术重点实验室, 天津 300072
基金项目:
国家自然科学基金（21476159，21676182）.

摘要: 当今世界环境与能源问题日益加剧，乙醇作为一种重要的清洁燃料和化学品受到广泛关注，迫切需要探索高效的乙醇合成方法，以满足日益增长的市场需求.其中，将煤炭、生物质、页岩气等为原料合成的二甲醚通过羰基化反应制乙酸甲酯、乙酸甲酯加氢制乙醇的串联式绿色乙醇合成路线具有重要的工业应用前景.然而，在二甲醚羰基化过程中，丝光沸石分子筛易积碳失活，阻碍了其工业应用.吡啶改性可以毒化丝光沸石12元环孔道中的酸性位，抑制积碳的形成，进而大幅度提高该催化剂的稳定性，但同时会使其催化活性降低约40%–50%.
为了解决这一难题，本文从分子水平上研究了吡啶吸附行为以及分子筛骨架空间位阻对丝光沸石催化剂上二甲醚羰基化反应的影响.通过解析丝光沸石的骨架结构，我们发现位于8元环侧袋和12元环孔道共用孔壁处O2位置上的酸性位是二甲醚羰基化反应的活性位，但它们在吡啶修饰过程中易被毒化而使催化剂活性下降.密度泛函理论计算结果表明，吡啶分子因受分子筛骨架空间位阻的影响，在O2处酸性位上的吸附较弱.而实验结果也表明，通过673K热处理可以再生被吡啶毒化的O2活性位，而并不影响12元环孔道中其它吡啶分子的吸附.因此，该热处理方法可以使丝光沸石催化剂保持高稳定性的同时，将二甲醚羰基化反应催化活性提高约60%.本文从分子水平证明了丝光沸石中O2活性位对二甲醚羰基化反应的重要作用，为绿色乙醇合成技术研究提供了新的思路，也为其它高效分子筛催化体系设计提供了有益的参考.

关键词:

English

Spacial hindrance induced recovery of over-poisoned active acid sites in pyridine-modified H-mordenite for dimethyl ether carbonylation

a Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
b Tianjin Key Laboratory of Applied Catalysis Science and Engineering, Tianjin University, Tianjin 300072, China;
c School of Physics, Nankai University, Tianjin 300071, China;
d Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Received Date: 28 January 2019
Revised Date: 25 February 2019
Fund Project:
This work was supported by the National Natural Science Foundation of China (21476159, 21676182).

Abstract: Zeolite catalysts, such as H-mordenite (H-MOR), are readily deactivated by coke deposition in carbonylation reactions. Pyridine modification of H-MOR can improve its stability but can lead to an undesirable loss in catalytic activity. Herein, we report the intrinsic impact of the pyridine adsorption behavior on H-MOR and the spacial hindrance of the zeolite frameworks on dimethyl ether (DME) carbonylation at a molecular level. We discovered that acid sites at O2 positions, located on common walls of eight-membered ring (8-MR) side pockets and 12-MR channels, were active in DME carbonylation, but were unfortunately poisoned during pyridine modification. Density functional theory calculations revealed that the pyridine-poisoned acid sites at the O2 positions could be easily regenerated due to the spacial hindrance of the zeolite frameworks. Accordingly, they can be facilely regenerated by proper thermal treatment, which induces 60% promotion in the catalytic activity along with a high stability. Our findings demonstrate the determining role of O2 positions in H-MOR for DME carbonylation and provide a new avenue for the rational design of other efficient zeolite-relevant catalytic systems.

Key words:

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空间位阻对吡啶过度修饰导致丝光沸石二甲醚羰基化酸性位中毒后再生的诱导作用

English

Spacial hindrance induced recovery of over-poisoned active acid sites in pyridine-modified H-mordenite for dimethyl ether carbonylation

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中国化学会秘书处

空间位阻对吡啶过度修饰导致丝光沸石二甲醚羰基化酸性位中毒后再生的诱导作用

English

Spacial hindrance induced recovery of over-poisoned active acid sites in pyridine-modified H-mordenite for dimethyl ether carbonylation

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

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