贯通介孔SAPO-34分子筛的合成及应用

Synthesis and Catalytic Application of SAPO-34 Zeolite with Interconnected Mesopores

为得到扩散性能优异的多级孔SAPO-34分子筛,采用软硬模板相结合的方法,在分子筛前驱液中引入改性的纳米碳管,成功制备了SAPO-34分子筛,采用扫描电子显微镜、透射电子显微镜和物理吸附等手段方法对合成的分子筛进行了表征,结果发现该材料晶粒中含有大量的介孔,且介孔相互贯通。用制得的介孔SAPO-34分子筛催化甲醇转化制低碳烯烃(MTO)的反应,结果显示该贯通介孔SAPO-34分子筛无论是在甲醇的转化率上,还是在乙烯和丙烯的收率上,相对于传统SAPO-34分子筛,都表现出较高的的反应活性和稳定性。

In order to obtain the hierarchical SAPO-34 molecular sieve with excellent diffusion properties, the SAPO-34 molecular sieve was successfully prepared by introducing modified carbon nanotubes into the precursor of molecular sieve with the combination of soft and hard templates. It was found that a large number of interconnected mesopores were contained in the grains by means of scanning electron microscope, transmission electron microscope and N2 physisorption. The catalytic activity of mesoporous SAPO-34 zeolite was investigated for methanol to olefins reaction. The results showed it has higher catalytic activity and better stability compared with the conventional SAPO-34 zeolite with similar morphology and size,in despite of the conversion rate of methanol or the olefin yields.