Abstract
In Contrast to the Monsanto homogeneous system, the Rh heterogeneous methanol carbonylation universally displays lower activity and stability. Here, a single site catalyst Rh-POL-PPh3 was successfully prepared by impregnation of the Rh2(CO)4Cl2 dichloromethane solution, and applied to heterogeneous methanol carbonylation in a continuous fixed-bed reactor for the first time. Due to single site Rh species and the electron-donating effect of P ligands and the strong multicoordination bonds between Rh and P, the Rh-POL-PPh3 catalyst exhibited a little higher TOF of 1550h−1 than that of optimized Monsanto process and maintained relatively stable activity for near 180h under 2.5MPa, 195°C. Thus, POL-PPh3 not only acts as a stable support but also a promotion of methanol carbonylation process.
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