One-step synthesis of hierarchical mesoporous zeolite Beta microspheres from assembly of nanocrystals

• Published in: Journal of colloid and interface science 2013-05, Vol.397, p.108-113
• Main Authors: Yin, Chengyang, Tian, Dong, Xu, Mai, Wei, Yijun, Bao, Xia, Chen, Yonghong, Wang, Fengwu
• Format: Article
• Language: English
• Subjects: alkylation; Assembly; benzene; Beta; Catalysis; catalysts; catalytic activity; centrifugation; Chemistry; Colloidal state and disperse state; Cumene; Exact sciences and technology; filtration; General and physical chemistry; Heterogeneous catalysts; Hierarchical porosity; Ion-exchange; isopropyl alcohol; Microspheres; Nanocrystals; Nanostructure; nitrogen; Physical and chemical studies. Granulometry. Electrokinetic phenomena; polymers; Porous materials; Scanning electron microscopy; sorption isotherms; Surface physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; thermogravimetry; transmission electron microscopy; X-ray diffraction; Zeolite Beta; Zeolites; Zeolites: preparations and properties
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2013.02.006

[Display omitted] ► Hierarchical Beta microspheres were one-step synthesized through a simple agent. ► The samples were with hierarchical structure and easily separated with filtration. ► The samples showed higher catalytic activity than conventional Beta in alkylation of benzene. Hierarchical mesoporous zeolite Beta microspheres (Beta-MPs) from assembly of nanocrystals were successfully one-step-synthesized through a simple polymer agent. The Beta-MPs sample was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption isotherms, and thermogravimetric analysis. The characteristics of the samples are comparable with conventional Beta zeolite. The Beta-MPs with a hierarchical mesoporous structure and a uniform size could be easily separated with filtration. This procedure successfully avoided the high-speed centrifugation of the nano-zeolites during the traditional method. As catalysts, the Beta-MPs showed higher catalytic activity and selectivity than conventional Beta in alkylation of benzene with isopropanol to cumene.