Structure and Evolution of Confined Carbon Species during Methane Dehydroaromatization over Mo/ZSM-5.
Structure and Evolution of Confined Carbon Species during Methane Dehydroaromatization over Mo/ZSM-5.
复制标题
DOI：
10.1021/acscatal.8b02491
复制
发表时间：
2018-09-07
期刊：
影响因子：
12.9
通讯作者：
Hensen EJM
中科院分区：
文献类型：
--
作者：
Kosinov N;Uslamin EA;Coumans FJAG;Wijpkema ASG;Rohling RY;Hensen EJM
表面碳（焦炭、碳质沉积物）是Mo/沸石催化甲烷脱氢芳构化的一个重要方面。通过脉冲反应技术、TGA、~（13）C NMR、TEM和XPS研究了催化剂从诱导期开始到完全失活过程中表面碳物种的演变。进行同位素标记以证实受限碳物种在MDA过程中的催化作用。结果发现，“硬”和“软”焦炭的区别主要是有关的焦炭物种的位置内的孔隙和外表面上，分别。此外，MoO 3物种作为一种活性氧化催化剂，降低了一定比例的焦炭的燃烧温度。此外，在用HF溶解沸石骨架之后，我们发现在沸石孔内的MDA反应期间形成的焦炭本质上是沸石模板碳材料。从最可获得的烃原料制备沸石模板碳的可能性对于这些有趣材料的开发是重要的。
Surface carbon (coke, carbonaceous deposits) is an integral aspect of methane dehydroaromatization catalyzed by Mo/zeolites. We investigated the evolution of surface carbon species from the beginning of the induction period until the complete catalyst deactivation by the pulse reaction technique, TGA, 13C NMR, TEM, and XPS. Isotope labeling was performed to confirm the catalytic role of confined carbon species during MDA. It was found that “hard” and “soft” coke distinction is mainly related to the location of coke species inside the pores and on the external surface, respectively. In addition, MoO3 species act as an active oxidation catalyst, reducing the combustion temperature of a certain fraction of coke. Furthermore, after dissolving the zeolite framework by HF, we found that coke formed during the MDA reaction inside the zeolite pores is essentially a zeolite-templated carbon material. The possibility of preparing zeolite-templated carbons from the most available hydrocarbon feedstock is important for the development of these interesting materials.
登录
查看更多内容
影响因子：
16.6
作者：
Kosinov, Nikolay;Coumans, Ferdy J. A. G.;Uslamin, Evgeny;Kapteijn, Freek;Hensen, Emiel J. M.
通讯作者：
Hensen, Emiel J. M.
影响因子：
64.8
作者：
Kim, Kyoungsoo;Lee, Taekyoung;Ryoo, Ryong
通讯作者：
Ryoo, Ryong
影响因子：
10.9
作者：
Kyotani, T;Ma, ZX;Tomita, A
通讯作者：
Tomita, A
影响因子：
16.6
作者：
Cao, Zhengwen;Jiang, Heqing;Caro, Juergen
通讯作者：
Caro, Juergen
影响因子：
5.3
作者：
Liu, HM;Li, Y;Xu, YD
通讯作者：
Xu, YD