Molecular sieve compound and composite material and application thereof

The invention relates to a molecular sieve compound, a composite material and application, the molecular sieve compound contains an oxide of aluminum, an oxide of alkaline earth metal and a rare earth modified molecular sieve, the rare earth modified molecular sieve is a molecular sieve doped with rare earth elements, and the pore volume of pores with the pore diameter of less than 3 nm in the molecular sieve compound accounts for more than or equal to 63.5% of the total pore volume; and the relation between the content of the rare earth element and the content of the aluminum oxide, the oxide of the alkaline earth metal and the molecular sieve meets a certain relational expression. The composite material contains a molecular sieve compound and an auxiliary agent loaded on the molecular sieve compound, and can be applied to flue gas adsorption desulfurization. 一种分子筛复合物、复合材料及应用，分子筛复合物含有铝的氧化物、碱土金属的氧化物和稀土改性分子筛，稀土改性分子筛为掺杂有稀土元素的分子筛，分子筛复合物中孔径在3nm以下的孔所占的孔体积占总孔体积的百分比≥63.5％；且稀土元素的含量与铝的氧化物、碱土金属的氧化物和分子筛的含量之间的关系满足一定的关系式。