Abstract
Porous carbon beads (Ys) prepared from poly(vinylidene chloride) are used as Rh supports for the carbonylation of methanol. TEM and STM images show that uniform pores spread over their surfaces. The optimum temperature for the pyrolysis is 1000°C. The special support has a specific surface area of 1000 m2/g with high mechanical strength and thermal stability. The average diameter of pore is in the range of 0.8–1.2 nm suitable for the fine spreading of Rh atoms. XPS spectra indicated that covalent bond is formed between carbon and rhodium in the catalyst, which makes the loss of rhodium become quite little. Catalytic carbonylation results show that the activity and selectivity of this catalyst very excellent. The influence of the external and internal diffusion on the methanol carbonylation was detected. The effect of varying the temperature, concentration of CH3I, content of Rh, initial partial pressure of CO and added acetic acid was examined.
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