Nourrdine Chaouati , Mohammad Fahda , Valentin Valtchev, Ludovic Pinard
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引用次数: 0
Abstract
ZEO-1, the first extra-large-pore aluminosilicate zeolite, was investigated for its catalytic performance, selectivity, and stability during propene transformation at 450 °C, in comparison with USY zeolite. Two ZEO-1 samples—phosphorus-containing and phosphorus-free—were evaluated to determine the influence of residual phosphorus species, originating from template decomposition, on acidity and catalytic behavior. Phosphorus-containing ZEO-1 exhibited a significantly lower concentration and strength of Brønsted acid sites, which led to reduced catalytic activity but improved stability, owing to limited coke formation and retention. In contrast, phosphorus-free ZEO-1 displayed higher activity, with coke deposits mainly composed of alkyl-naphthalene derivatives forming within the 12-membered ring channels. In this sample, coke led to deactivation via site poisoning, with one coke molecule deactivating one Brønsted acid site. Although the overall amount of coke formed on ZEO-1 was higher than on USY, the impact on catalytic performance was less severe. In USY, each coke molecule deactivated approximately three Brønsted acid sites, indicating higher coke toxicity. These results demonstrate that ZEO-1’s open microporous structure contributes to improved resistance to deactivation by coke, highlighting its potential as a stable catalyst for acid-catalyzed reactions.
期刊介绍:
The Journal of Catalysis publishes scholarly articles on both heterogeneous and homogeneous catalysis, covering a wide range of chemical transformations. These include various types of catalysis, such as those mediated by photons, plasmons, and electrons. The focus of the studies is to understand the relationship between catalytic function and the underlying chemical properties of surfaces and metal complexes.
The articles in the journal offer innovative concepts and explore the synthesis and kinetics of inorganic solids and homogeneous complexes. Furthermore, they discuss spectroscopic techniques for characterizing catalysts, investigate the interaction of probes and reacting species with catalysts, and employ theoretical methods.
The research presented in the journal should have direct relevance to the field of catalytic processes, addressing either fundamental aspects or applications of catalysis.