It will increase sharply with the decrease of the diameter of sieve pore.
随着筛孔直径的减小，压力梯度大大增加。
The silicoaluminophosphate molecular sieve(SAPO-5) with relative bigger pore diameter was synthesized hydrothermally and the optimum synthesis condition was determined through experiments.
采用水热法合成大孔径硅磷酸铝分子筛（SAPO-5），并通过试验确定了SAPO-5分子筛的最佳合成条件。
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