Molecular sieves with intergrown phases of AEI and CHA topologies and catalyst thereof

Molecular sieves with intergrown phases of AEI and CHA topologies, wherein a method for preparing the molecular sieves comprise the following steps:

• (1) dissolving a hydroxyphosphono organic alkali R in water and stirring evenly;
• adding an aluminum source, stirring and dispersing the mixture to be gelatinous, slowly adding a silicon source, stirring and reacting for 2 h-6 h, then standing for fully aging to obtain a sol-gel precursor, wherein the aluminum source and the silicon source are calculated based on Al2O3 and SiO2 respectively, a mass ratio of the silicon source, the aluminum source, the hydroxyphosphono organic alkali R, and the deionized water is SiO2:Al2O3:R:H2O=(0.01-30):1:(0.2-30):(5-300), and depending on acidity and alkalinity of raw materials, a pH value of the sol-gel precursor is in a range of 6-9;
• and
• (2) putting the sol-gel precursor into a closed hydrothermal synthesis reactor for isothermal hydrothermal reaction at 130° C.-220° C. for 6.5 h-48 h, followed by pressure relief, solid-liquid separation, thorough washing of a filter cake, drying, and calcination, to obtain H-type molecular sieves with the intergrown phases of AEI and CHA topologies;
• wherein the hydroxyphosphono organic alkali R has a molecular weight of less than 5,000, and contains at least one of cations shown in Formulas I-XI:
• and
• an anion of the hydroxyphosphono organic alkali R is at least one selected from a group consisting of OH−, NO3−, Br−, HCO3−, CO32−, HSO3−, and HSO4−.