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利用红外、气相色谱、色谱 -质谱联用方法对甲醇羰基化反应过程中甲醇钾和甲醇钠催化剂的失活情况进行了研究。结果表明 :在本研究条件下 ,甲醇钠 (甲醇钾 )催化剂活性在保持一段时间的稳定后 ,随反应时间的继续延长逐渐降低。导致催化剂活性降低的主要原因是甲醇钠 (甲醇钾 )可以直接与产物甲酸甲酯反应形成甲酸钠 (甲酸钾 )和二甲醚。甲酸钠对甲醇羰基化反应也具有一定的催化作用 ,但其活性远远低于甲醇钠。降低反应温度可以减缓催化剂的失活速度。
The deactivation of methanolactone and sodium methoxide catalysts during the carbonylation of methanol was investigated by infrared, gas chromatography and mass spectrometry. The results showed that under the conditions of this study, the activity of sodium methoxide (potassium methoxide) catalyst gradually decreased with the prolongation of reaction time after the reaction was maintained for a period of time. The main reason for the decrease in catalyst activity is that sodium methoxide (potassium methoxide) can react directly with the product methyl formate to form sodium formate (potassium formate) and dimethyl ether. Sodium formate carbonylation reaction also has some catalytic effect, but its activity is much lower than sodium methoxide. Decreasing the reaction temperature can slow down the deactivation of the catalyst.