MOLECULAR SIEVE AND MANUFACTURING METHOD THEREOF

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To provide a molecular sieve having good catalytic activity of denitration and hydrothermal aging resistance at both low temperature and high temperature, and a method for manufacturing the same.SOLUTION : A molecular sieve has a microscopic form like a football and comprises a molecular sieve skeleton including silicon and aluminum and an active element including copper and a rare earth element. The rare earth element is one or more kinds selected from La, Ce, Pr, Nd, Pm, Sm, Eu, Sc and Y. The mass ratio between the silicon and the aluminum is (3 to 9) : 11 in the mass ratio converted into silica and aluminum oxide, respectively. The content of copper in the molecular sieve converted into copper oxide is 1.5 to 3.2 wt.%. The mass of rare earth oxide converted into rare earth oxide is 50 ppm to 2 wt.% of the molecular sieve skeleton. The molecular sieve has good catalytic activity at 175 to 550°C.SELECTED DRAWING : Figure 1