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用小型加压固定床反应器对比研究了晶粒度分别为20～50nm(DNZ)、1～2μm(IDG)和3～4μm(NK)的ZSM-5沸石的液化气(含C4烯烃56%、C4烷烃43%)低温芳构化反应性能。用SEM、XRF、XRD、NH3-TPD、吸附量和积炭量测定等方法对催化剂进行了表征。结果表明,纳米沸石催化剂DNZ与微米沸石催化剂IDG、NK虽初始芳构化活性(C5+烃中的芳烃含量)基本相同,但当DNZ、NK、IDG分别运转到192h、144h和168h时,芳烃含量分别降为68%、52%和46%,而积炭量依次为209、162和201mg/g。这是由于纳米ZSM-5沸石具有晶间孔辅助容炭,孔口多和孔道短等特点,因而在液化气低温芳构化反应中表现出比微米ZSM-5沸石更强的抗积炭失活能力。
Liquefied gas (containing 56% C4 olefins) of ZSM-5 zeolite with grain sizes of 20-50nm (DNZ), 1-2μm (IDG) and 3-4μm (NK) , C4 alkanes 43%) low temperature aromatization reaction performance. The catalysts were characterized by SEM, XRD, XRD, NH3-TPD, adsorption and carbon deposition. The results showed that although the initial aromatization activity (the content of aromatics in C5 + hydrocarbons) of DNZ zeolite catalyst and IDG and NK catalyst were basically the same, when DNZ, NK and IDG were operated for 192h, 144h and 168h respectively, the aromatic content Respectively, down to 68%, 52% and 46%, while the amount of carbon deposition were 209,162 and 201mg / g. This is because the nano-ZSM-5 zeolite has the characteristics of intercrystalline pore-assisted carbon, porous pores and short pore channels. Therefore, the nanostructured ZSM-5 zeolite exhibits stronger anti-carbon loss than the microstructured ZSM-5 zeolite in the low-temperature aromatization of liquefied gas Live ability.