Coke formation and carbon atom economy of methanol-to-olefins reaction.
Coke formation and carbon atom economy of methanol-to-olefins reaction.
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DOI：
10.1002/cssc.201100528
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发表时间：
2012-05
期刊：
影响因子：
8.4
通讯作者：
Yingxu Wei;C. Yuan;Jinzhe Li;Shutao Xu;You Zhou;Jingrun Chen;Quanyi Wang;Lei Xu;Y. Qi;Qing Zhang;Zhongmin Liu
中科院分区：
文献类型：
--
作者：
Yingxu Wei;C. Yuan;Jinzhe Li;Shutao Xu;You Zhou;Jingrun Chen;Quanyi Wang;Lei Xu;Y. Qi;Qing Zhang;Zhongmin Liu
甲醇制烯烃（MTO）工艺正在成为从煤或天然气生产轻质烯烃的最重要的非石化途径。最大限度地提高目标产物乙烯和丙烯的产量，并最大限度地减少副产品和焦炭的产生，是甲醇碳资源高效利用的主要考虑因素。在目前的工作中，通过同时测量气相中产生的挥发性产物和催化剂相中的受限焦炭沉积来评估甲醇的多相催化转化。绘制实时和完整的反应曲线，以比较不同反应温度下催化剂 SAPO-34 的甲醇转化碳原子经济性。碳原子经济性的差异与SAPO-34催化剂中积炭的形成密切相关。测定了密闭焦炭化合物。发现了一种新型的限域有机物，这解释了低反应温度条件下的快速失活和低碳原子经济性。基于碳原子经济性评价和焦炭种类确定，提出了MTO工艺的优化操作条件；这些条件保证了甲醇的高转化效率。
The methanol-to-olefins (MTO) process is becoming the most important non-petrochemical route for the production of light olefins from coal or natural gas. Maximizing the generation of the target products, ethene and propene, and minimizing the production of byproducts and coke, are major considerations in the efficient utilization of the carbon resource of methanol. In the present work, the heterogeneous catalytic conversion of methanol was evaluated by performing simultaneous measurements of the volatile products generated in the gas phase and the confined coke deposition in the catalyst phase. Real-time and complete reaction profiles were plotted to allow the comparison of carbon atom economy of methanol conversion over the catalyst SAPO-34 at varied reaction temperatures. The difference in carbon atom economy was closely related with the coke formation in the SAPO-34 catalyst. The confined coke compounds were determined. A new type of confined organics was found, and these accounted for the quick deactivation and low carbon atom economy under low-reaction-temperature conditions. Based on the carbon atom economy evaluation and coke species determination, optimized operating conditions for the MTO process are suggested; these conditions guarantee high conversion efficiency of methanol.