کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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59675 | 1419422 | 2016 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis and characterization of an unusual snowflake-shaped ZSM-5 zeolite with high catalytic performance in the methanol to olefin reaction Synthesis and characterization of an unusual snowflake-shaped ZSM-5 zeolite with high catalytic performance in the methanol to olefin reaction](/preview/png/59675.png)
The ZSM-5 zeolite with an unusual snowflake-shaped morphology was hydrothermally synthesized for the first time, and compared with common ellipsoidal and boat-like shaped samples. These samples were characterized by N2 adsorption-desorption, X-ray fluorescence spectroscopy, scanning electron microscopy, X-ray diffraction, magic angle spinning nuclear magnetic resonance, temperature-programmed desorption of ammonia, and infrared spectroscopy of pyridine adsorption. The results suggest that the BET surface area and SiO2/Al2O3 ratio of these samples are similar, while the snowflake-shaped ZSM-5 zeolite possesses more of the (101) face, and distortion, dislocation, and asymmetry in the framework, resulting in a larger number of acid sites than the conventional samples. Catalysts for the methanol to olefin (MTO) reaction were prepared by loading Ca on the samples. The snowflake-shaped Ca/ZSM-5 zeolite exhibited excellent selectivity for total light olefin (72%) and propene (39%) in MTO. The catalytic performance influenced by the morphology can be mainly attributed to the snowflake-shaped ZSM-5 zeolite possessing distortion, dislocation, and asymmetry in the framework, and lower diffusion limitation than the conventional samples.
Graphical AbstractAn unusual snowflake-shaped ZSM-5 zeolite (HA) with a large amount of acid sites is extensively investigated. The corresponding Ca-loaded catalyst exhibits excellent selectivity for light olefin formation (72%) in the methanol to olefin reaction.Figure optionsDownload as PowerPoint slide
Journal: Chinese Journal of Catalysis - Volume 37, Issue 2, February 2016, Pages 308–315