Direct alkenylation of aromatics with phenylacetylene over supported H3PW12O40 catalysts as a clean and highly efficient approach to producing α-arylstyrenes

摘要: Abstract Phosphotungstic acid (PTA) catalysts supported on MCM-41 prepared via a wet impregnation method assisted by vacuum with heating (IMPVH) were first employed for direct alkenylation of different aromatics phenylacetylene to synthesize α-arylstyrenes. N 2 adsorption–desorption, FT-IR, X-ray diffraction (XRD), and NH 3 temperature-programmed desorption (NH TPD) characterization techniques used reveal the relationship between catalyst’s nature properties. The results demonstrate that fabricated 25 wt.% PTA/MCM-41 catalyst exhibits outstanding catalytic performance, remarkably better than HY zeolite. It is also found properties are strongly dependent PTA dispersity, sites, preservability Keggin structure, mesopore architecture, notably affected loading calcination temperature. stability illustrate more 99% maximum conversion can be obtained, 92% maintained up 540 min time stream. We find decrease in activity, along long reaction time, mainly ascribable deactivation coke deposition. spent refreshed, 97.1% obtained over regenerated catalyst. This approach highly efficient extra-substituted benzene, polycyclic aromatics, even heteroaromatics, suggesting presented this paper green synthesis protocol