Propane dehydrogenation catalyzed by single Lewis acid site in Sn-Beta zeolite
نویسندگان
چکیده
The gap between supply and demand of propylene has become more evident, because a large consumption the downstream products derived from propylene. Propane dehydrogenation (PDH) constitutes an important alternative for production propylene, thus considerable attention been paid to development eco-friendly cost-efficient catalysts this process. Herein, we discover that Sn-Beta zeolite with Lewis acid sites can activate C-H bond, exhibits high catalytic performance in PDH. XRD, STEM, XPS characterizations confirm Sn species are incorporated into framework, H2-TPR suggests there is strong interaction framework. It found active site reaction, Brønsted responsible cracking reaction. rate/cracking rate positively proportional L/B ratio, ratio beneficial propane Na-Sn-Beta-30 catalyst possessing highest amount but lowest Brønsted/Lewis best PDH, which delivers conversion 40% selectivity 92%. Most importantly, these zeolites extremely stable without any detectable deactivation under harsh reaction condition 72 h. Density functional theory calculations reveal both adjacent O atom or OH group cooperatively act as sites. PDH occurs through direct mechanism hydrogen molecule produced by coupling H primary C3H7 motif proton closed water open seems reactive than ones, intrinsic enthalpy barriers calculated be 242 ~ 301 kJ/mol depending on hydroxylation extents. These efficient could provide new possibility generation stability
منابع مشابه
Effect of Addition of Different Promoters on the Performance of Pt-Sn-K/Al2O3 Catalyst in the Propane Dehydrogenation
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ژورنال
عنوان ژورنال: Journal of Catalysis
سال: 2021
ISSN: ['0021-9517', '1090-2694']
DOI: https://doi.org/10.1016/j.jcat.2020.12.019