Influence of pretreatment and reaction conditions on the catalytic activity of HAlBEA and CoHAlBEA zeolites in vinyl chloride formation from 1,2-dichloroethane

• Published in: Microporous and mesoporous materials Vol. 266; pp. 32 - 42
• Main Authors: Kamińska, Izabela I., Lisovytskiy, Dmytro, Valentin, Laetitia, Calers, Christophe, Millot, Yannick, Kowalewski, Emil, Śrębowata, Anna, Dzwigaj, Stanislaw
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.08.2018; Elsevier
• Subjects: 1,2-Dichloroethane; BEA; Chemical Sciences; Dehydrochlorination; Vinyl chloride; 1,2-Dichloroethane; Dehydrochlorination; Co; Vinyl chloride; BEA; 1; chloride; Co BEA; Vinyl; 2-Dichloroethane
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2018.02.041

HAlBEA and CoHAlBEA zeolite catalysts treated at 523 K or 873 K for 3 h in Ar, H2/Ar or air flows, respectively, were investigated in catalytic dehydrochlorination of 1,2-dichloroethane (DCE). The dehydrochlorination of DCE on these zeolite catalysts resulted in almost 100% selectivity to vinyl chloride (VC) monomer. It was demonstrated that different conditions of pretreatment of zeolite catalysts resulted in varied amount of Lewis and Brønsted acid sites responsible of the catalytic activity, stability and selectivity. HAlBEA and CoHAlBEA zeolites treated in the Ar flow showed the best activities in the dehydrochlorination of DCE, while the same zeolites treated in the air flow demonstrated the best time-on-stream stability. To clarify the reasons of differences in the catalytic behavior of HAlBEA and CoHAlBEA treated in the various conditions N2 physisorption, XRD, TPH, TEM, XPS, NMR and FTIR measurements were performed. [Display omitted] •HAlBEA and CoHAlBEA were active in dehydrochlorination of 1,2-dichloroethane.•Dehydrochlorination of DCE was related to ratio of B/L acidic sites.•100% selectivity to VC in gas-phase dehydrochlorination of DCE was observed.