【摘要】 以水合硝酸镓为前体，通过晶种诱导、水热法合成厚度小于100 nm的Ga纳米片状分子筛，制备不同镓铝比的Ga-ZSM-5和不同镓含量的纯硅Ga-S-1纳米片分子筛。采用XRD、SEM、NH₃-TPD等方法对样品进行表征，并在气相连续微型固定床反应器上考察各样品的甲醇耦合丁烯催化裂解反应性能。结果表明，与ZSM-5相比，Ga-ZSM-5酸强度降低且酸量减少，Ga的引入阻碍Al进入分子筛骨架。以Ga-ZSM-5为催化剂，产物中乙、丙烯的选择性可提高（4～5）个百分点；同时，产物中低碳烷烃选择性降低。以Ga-S-1为催化剂，随着n（Si）∶n（Ga）增加到100,产物中n（丙烯）∶n（乙烯）约7,比ZSM-5提高了近2倍；同时，副产物C₂～C₄烷烃的收率降低（30～50）个百分点。更多还原

【Abstract】 Ga-ZSM-5 with different ratio of gallium to aluminum and Ga-S-1 with different content of gallium were prepared by means of seed induction and hydrothermal synthesis of Ga-S-1 nanoparticle molecular sieves with thickness less than 100 nm using gallium nitrate hydrate as precursor.The samples were characterized by XRD,SEM and NH₃-TPD,and the catalytic cracking performance of methanol coupled butene was investigated in a gas-phase continuous micro-fixed bed reactor.The results showed that comp-ared with ZSM-5,the acid strength and acid content of GA-ZSM-5 were decreased, and the introduction of Ga prevented Al from entering the molecular sieve framework.Using Ga-ZSM-5 as catalyst, the selectivity of ethylene and propylene in the product can be increased by（4～5） percentage points.At the same time, the selectivity of low carbon alkane in the product is reduced.Using GA-S-1 as catalyst, with the increase of n（Si）∶n（Ga） to 100,the ratio of n（propylene）∶n（ethylene） in the product is about 7,which is nearly 2 times higher than that of ZSM-5.At the same time, the yield of byproduct C₂～C₄ alkanes decreased by（30～50） percentage points.更多还原