Pore Size Architecture of Hexagonal Mesoporous Carbon Nitride (HMCN) for Metal-Free Synthesis of p-Hydroxycinnamic Acid
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The nanochannels of hexagonal mesoporous carbon nitride (HMCN) base catalytic materials were architected with diameter of 4.7, 5.9, and 7.1 nm using SBA-15 hard templates and these catalysts were represented as HMCN (4.7), HMCN (5.9), and HMCN (7.1), respectively. These materials were characterized by XRD, N2 sorption, FESEM, EDAX, HRTEM, FTIR and DR UV–Vis spectroscopy. The influence of HMCN catalysts with different pore sizes on p-hydroxycinnamic acid synthesis was investigated in metal/pyridine-free reaction conditions. The catalytic experimental results of HMCN (5.9) catalyst with optimum pore diameter of 5.9 nm showed an excellent catalytic performance of 94.5% p-hydroxybenzaldehyde conversion with 100% p-hydroxycinnamic acid selectivity within 60 min in comparison with other two catalysts, namely HMCN (4.7) and HMCN (7.1).
KeywordsHMCN Pore size Knoevenagel–Doebner condensation Heterogeneous catalysis Metal-free base catalyst
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