SAPO-35/SAPO-34 symbiotic molecular sieve, preparation method and application thereof, molecular sieve composition and application thereof

The invention belongs to the field of molecular sieves, and particularly discloses an SAPO-35/SAPO-34 symbiotic molecular sieve, a preparation method and application thereof, a molecular sieve composition and application thereof. The preparation method of the SAPO-35/SAPO-34 symbiotic molecular sieve comprises the following steps: carrying out one-step heating crystallization treatment on a mixture formed by an aluminum source, a phosphorus source, a silicon source, methyl triethyl ammonium hydroxide and water to obtain the SAPO-35/SAPO-34 symbiotic molecular sieve, wherein the molar ratio of Al2O3 to P2O5 to SiO2 to R to H2O is 1: (0.65 to 1.40): (0.01 to 0.65): (1.50 to 2.50): (63 to 120), and the mixture is crystallized for 0.5 to 7 days at the temperature of between 150 and 205 DEG C. The preparation method comprises the following steps of: preparing an aluminum source, a phosphorus source, a silicon source, methyl triethyl ammonium hydroxide (R) and water according to a molar ratio of Al2O3 to P2O5 to Si