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根据氧化亚氮在表面零价铜上分解放出氮的特征反应,建立了脉冲氧化亚氮-色谱法测定各种含铜催化剂活性表面积的方法。对商品氧化铜、实验室中碳酸钠分解硝酸铜所制成的活性氧化铜、Raney 铜、工业脱氧铜催化剂、一氧化碳加氢低压合成甲醇ICI-51型催化剂以及目前正在开发的合金铜-锌催化剂等均进行了活性铜表面积的测量。结果表明,上述催化剂的活性表面积仅占总表面积的一部分,甚至是极少的一部分。约为3—30%。将一系列合金铜锌催化剂的活性表面积数值与其在实验室中一氧化碳加氢合成甲醇的催化活性进行关联,发现甲醇时空收率与催化剂的活性夜面积成正比,亦即反应速度与活性表面积呈线性关系。通过对催化剂表面铜使氧化亚氮分解并吸附氧的本质的探讨,证实了一个氧原子吸附在两个相邻的表面铜原子上的设想,为含铜催化剂对一氧化碳加氢合成甲醇反应活性组分问题的探讨提供了有用的信息。
According to the characteristic reaction of nitrous oxide decomposing and releasing nitrogen on surface zero - valent copper, a method for determining the active surface area of various copper - containing catalysts by pulsed nitrous oxide - chromatography was established. The commercial copper oxide, copper carbonate in the laboratory decomposition of active copper oxide made of copper nitrate, Raney copper, industrial copper catalyst, carbon monoxide hydrogenation low pressure synthetic methanol ICI-51 type catalyst and is currently being developed alloy copper - zinc catalyst Etc. were measured for the active copper surface area. The results show that the active surface area of the above catalyst accounts for only a small part of the total surface area. About 3-30%. Correlation between the active surface area of a series of copper-zinc catalysts and the catalytic activity of methanol in the hydrogenation of carbon monoxide in the laboratory showed that the space-time yield of methanol was proportional to the active night-area of the catalyst, that is, the reaction rate was linear with the active surface area relationship. Through the discussion of the nature of copper decomposing nitrous oxide and adsorbing oxygen on the surface of catalyst, it is confirmed that one oxygen atom is adsorbed on two adjacent surface copper atoms for the hydrogenation of carbon monoxide to carbon monoxide by a copper-containing catalyst to form a methanol-reactive group The sub-questions provide useful information.