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一、概述: 在气固相催化反应中,气体分子在催化剂表面上的化学吸附,是催化反应中一个重要的基本阶段。化学吸附过程也就是反应分子的活化过程。在氨合成催化反应中,目前一般都认为氮分子的化学吸附,即氮分子的活化是该反应的控制步骤。因此,作为优良的合成氨触媒必须具备这样的条件:它具备解离或活化氮分子的能力,然而,它与解离了的氮原子或活化的氮分子又不生成稳定的氮化物,从生物固氮机理的角度来说,就是要生成不稳定的氮络合物。我们设想,在采用复合催化剂的情况下,就为创造这种条件提供了新的可能,就是说,有可能使氮分子在双金属或多金属的共同作用下得到活化。
I. Overview: In the gas-solid catalytic reaction, the gas molecules on the catalyst surface chemical adsorption, catalytic reaction is an important basic stage. The chemical adsorption process is also the activation process of the reaction molecule. In the ammonia synthesis catalytic reaction, it is generally accepted that the chemical adsorption of nitrogen molecules, that is, the activation of nitrogen molecules is the control step of the reaction. Therefore, as an excellent synthetic ammonia catalyst, it must have the following conditions: it has the ability to dissociate or activate nitrogen molecules, however, it does not form stable nitrides with dissociated nitrogen atoms or activated nitrogen molecules, From a mechanistic point of view, it is to generate unstable nitrogen complexes. We envisage that in the case of the composite catalyst, new possibilities are created for creating such conditions, that is to say that it is possible to activate nitrogen molecules by the action of bimetallic or polymetallic compounds.