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CO_2对CO加氢制甲醇有着很大影响。当CO_2含量少(约3％以下)时,可促进CO加氢,超出此限度后,即阻碍作用,这效应并不与CO_2的绝对分压有关,只要CO/CO_2恒定,这个作用就得以显露,即使总压低至常压附近也是这样。但常压下,于通常反应温度间出现随温度升高,甲醇产率下降的现象,这可能与生成甲醇的选择性减少有关,故采用在较低温度下(200℃)予以评价。反应压力大范围变动时的这个特性对弄清 Cu/ZnO 催化剂是否存在两种不同的活性中心会有所帮助。
CO_2 on the CO hydrogenation of methanol has a great influence. When the content of CO 2 is less than 3%, it can promote CO hydrogenation beyond which it hinders the effect, which is not related to the absolute partial pressure of CO 2. As long as CO / CO 2 is constant, this effect is revealed , Even if the total pressure down to atmospheric pressure near the same. However, under normal pressure, the phenomenon of methanol yield decreasing with the increase of temperature at normal reaction temperature may be related to the selective reduction of methanol formation. Therefore, it was evaluated at a lower temperature (200 ° C). This characteristic of a wide range of reaction pressures can help clarify the presence or absence of two different active sites in the Cu / ZnO catalyst.