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Title: | Unraveling the spatial distribution of the acidity of HZSM-5 zeolite on the level of crystal grains | Authors: | Xian, X Chen, J Chu, Y He, M Zhao, S Dong, L Ren, J |
Issue Date: | Apr-2021 | Source: | Aiche journal, Apr. 2021, v. 67, no. 4, e17134 | Abstract: | Here we developed a new method to quantitatively characterize the spatial distribution of the Brønsted acidity of HZSM-5 zeolite on the crystal grains level indirectly. The Brønsted acid sites of HZSM-5 zeolite completely covered or blocked by previous coke deposition were released gradually from the outer surface to the center of the crystal grains via shrinking core mode isothermal oxidation with high temperature and low oxygen concentration. The spatial distribution of the coke was obtained based on the one-dimensional position coordinate Lrp through building and solving an enhanced shrinking core model. Then the released acidity characterized by n-propylamine temperature-programmed decomposition was correlated to the specific position of Lrp. The results show that the acid density is roughly homogenous while the acid strength is heterogeneous within the crystal grains. From the outer surface to the center of the crystal grains, the strength of the Brønsted acid sites increase gradually. | Keywords: | Acidity Coke deposition HZSM-5 zeolite Isothermal oxidation Spatial distribution |
Publisher: | John Wiley & Sons | Journal: | Aiche journal | ISSN: | 0001-1541 | DOI: | 10.1002/aic.17134 | Rights: | © 2020 American Institute of Chemical Engineers This is the peer reviewed version of the following article: Xian, X, Chen, J, Chu, Y, et al. Unraveling the spatial distribution of the acidity of HZSM-5 zeolite on the level of crystal grains. AIChE J. 2021; 67:e17134 which has been published in final form at https://doi.org/10.1002/aic.17134. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited. |
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Xian_Unraveling_the_Spatial_Distribution.pdf | Pre-Published version | 1.28 MB | Adobe PDF | View/Open |
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