One-step synthesis of hierarchical [B]-ZSM-5 using cetyltrimethylammonium bromide as mesoporogen

Abstract

One-step facile synthesis of boron containing ZSM-5 microspheres is developed using 1,6-diaminohexane asthe structure-directing agent and cetyltrimethylammonium bromide as the mesoporogen. High boron incorporation upto Si/B ratio of 38 is achieved and evidenced by the stretching vibrations of B–O–Si at 667 $cm^{-1}$and 917 $cm^{-1}$ usingFourier-transform infrared spectra. The morphology of the crystals resembles berry-like spheres with sizes approximately15 µm, which is composed of aggregated nanocrystals having sizes around 450 nm, is observed using scanning electronmicroscopy. The textural properties, i.e. the surface areas and pore volumes are investigated using $N_2$ adsorption at–196 °C. t-plot micropore volume of 0.11 $cm^3$/g and mesopore volume of 0.14 $cm^3$/g are obtained applying this synthesismethod for mesopores having pore diameters within the range of 2–10 nm.