Then the mixture of the liquid substrate and solid catalyst is shaken or stirred in a hydrogen atmosphere However, then actual reaction takes place at the surface of the metal catalyst and is an example of heterogeneous or surface catalysisFor example hydrolysis of sugar in the presence of sulphuric acid Heterogeneous Catalysis Heterogeneous catalysis of chemical reactions is a process where the reactants involved in the reaction and the catalyst are in different phases For example reaction of hydrogen and nitrogen in the presence of finely divided iron to form ammoniaHomogeneous & Heterogeneous Catalysis Catalysts increase the rate of reaction by providing an alternative pathway which has a lower activation energy Catalysts can be either homogeneous or heterogeneous Homogeneous catalysts are those that are in the same phase as the reaction mixture For example, in the esterification of ethanoic acid (CH
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