基于介尺度结构解聚-重组装的Beta分子筛的绿色合成及应用

Green synthesis and application of Beta zeolite prepared via mesoscale depolymerization-reorganization strategy

Beta分子筛作为一种重要的催化材料,被广泛应用于石油化工、煤化工及环境保护等领域,但其常规的水热合成过程存在成本高、单釜产率低和废水排放量大等问题。本研究提出了一条基于天然矿物介尺度结构解聚-重组装的无溶剂绿色合成Beta分子筛的新路线,采用该路线所合成的Beta分子筛(Beta-Anhyd)含有丰富的介孔和大孔结构,且具有较商业Beta分子筛(Beta-Ref)更高的比表面积和更低的酸量,以其为载体,通过脱Al补Sn制备的Sn-Beta催化剂(Beta-Anhyd-Deal)在丙烷脱氢反应中表现出较参比催化剂(Beta-Ref-Deal)更加优异的催化性能。

As an important catalytic material,Beta zeolite is widely used in petrochemical,coal chemical and environmental protection fields,but its conventional hydrothermal synthesis process has problems such as high cost,low yield per kettle and large waste water discharge.This article presents a green and economic strategy to synthesize Beta zeolite from natural mineral via a mesoscale depolymerization-reorganization approach.The proposed methodology results in a Beta zeolite(denoted as Beta-Anhyd)owning abundant meso-and macro-pores,larger specific surface area and lower acid amount than a commercial sample(Beta-Ref).The Beta-Anhyd derived catalyst(Beta-Anhyd-Deal)that was prepared by a two-step post-synthesis method consisting of the dealumination of Beta-Anhyd and the incorporation of tin shows much better catalytic performance in the propane dehydrogenation reaction than the reference one(Beta-Ref-Deal).