The optimal catalytic performance could be obtained by adjusting the surface concentration of active phase within a proper range.
只有当催化剂表面的活性相浓度控制在适当的范围，催化剂才表现出最佳的催化行为。
The concentration of Cr(III)is easily controlled in optimal range by adding a proper amount of oxalic acid when Cr(III)content is low.
三价铬含量偏低时，根据计算加入适量草酸即可很方便地将其控制在最佳范围内。
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