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(c) There are three types of conditions used for methanol manufacture:

high pressure: 250-300 atm; 300-450 °C using ZnO-Cr₂O3 catalysts

medium pressure: 150 atm; 300 °C using ZnO-CuO catalysts

low pressure: 50 atm; 225 °C using Cu-ZnO-Al2O3 catalysts.

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