Modified natural halloysite nanotube solely employed as an efficient and low-cost solid acid catalyst for alpha-arylstyrenes production via direct alkenylation

摘要: Abstract Owing to unique mesoporous/macroporous hollow nanotubular structure, relatively high specific surface area, abundant hydroxyl groups, ecological and biocompatibility as well low cost large availability, the natural halloysite nanotube (HNT) has attracted great attention in drug delivery, catalysis, adsorption, energy storage, etc. HNT was generally used support but rare report for being solely catalyst. In this work, we firstly reported that HNTS were employed a solid acid catalyst alkenylation of diverse aromatics with phenylacetylene their α-arylstyrenes. It found facile ion exchange calcination pretreatment demonstrated outstanding catalytic performance p-xylene phenylacetylene, 95.6% conversion 95.8% selectivity toward α-(2,5-dimenthylphenyl) styrene achieved. The characterized by N2 physisorption, transmission electron microscopy (TEM), NH3 temperature-programmed desorption (NH3-TPD), pyridine infrared spectroscopy (Py-IR), Inductively coupled plasma (ICP), thermogravimetric analysis (TGA) techniques. Correlated nature HNTs reaction results, it revealed significantly dependent on acidic properties textural feature notably affected times (NIE) temperature (TC). Especially, besides properties, formed mesopores walls strongly affects activity, coke-deposition behavior. appropriate sites accessibility are essential obtaining satisfactory performance. modified catalyzed can be extended substrates good α-arylstyrenes production. combination excellent regeneration deactivated process allows promising candidate for, limited