Abstract
The effects of Lewis acid Al2O3 on Rh-incorporated mesoporous g-C3N4 (AlRh-CN) were investigated to verify an enhanced activity and stability in a liquid-phase carbonylation of methanol. The novel AlRh-CN with 2.0 wt%Al (Al(2)Rh-CN) revealed a higher yield of acetic acid (AA) and methyl acetate (MA) with a small Rh leaching. The enhanced activity on the optimal Al(2)Rh-CN was attributed to the highly dispersed and partially reduced Rh nanoparticles by preserving initial oxidation states as well as by maintaining its stronger interaction on the Al-modified g-C3N4 surfaces. Its superior activity was originated from the highly dispersed Lewis acid Al3+ sites assigned to Al2O3 phases due to an increased reverse esterification reaction rate. The higher activity on the Al(2)Rh-CN was originated from synergy effects such as a larger Lewis acid Al2O3 sites acting as a pillaring material to increase specific surface area of Al(2)Rh-CN and to increase a reverse esterification reaction.
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