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本工作以铜盐为晶种合成出CuZSM-5沸石,制成了CuHZSM-5沸石(简称CuHZSM-5(合));用X射线衍射、尺码分子吸附、氮吸附微量量热、热分析系统(DSC、TGA、DTA)以及混合烃连续微反、临氢和非临氢纯烃脉冲微反等技术,考察了样品的结构、酸性、择形性能和催化裂化活性,并与H型、Cu~(2+)交换型的ZSM-5沸石进行了比较。实验结果表明,CuHZSM-5(合)确系一种含铜高硅铝比ZSM-5晶型沸石,Cu~(2+)离子有可能进入沸石的阳离子位置,从而使孔道结构变窄,显示出良好的择形性能;在高温条件下对沸石的酸性中心起着保护作用;对氨有多种吸附中心;在临氢条件下,有较高的酸性裂解活性。
CuZSM-5 zeolite (CuHZSM-5 (abbreviated as CuHZSM-5)) was synthesized from CuZSM-5 zeolite with Cu salt as seed crystal. The effects of XRD, size molecular adsorption, (DSC, TGA, DTA) as well as continuous micro-reversal of mixed hydrocarbon, presence of hydrogen and non-hydro pure hydrocarbon pulse micro-inversion techniques were used to investigate the structure, acidity, shape- ~ (2+) exchanged ZSM-5 zeolite. The experimental results show that CuHZSM-5 (Co) is indeed a copper-containing high Si / Al ratio zeolite ZSM-5, Cu 2+ ions may enter the zeolite cationic position, so that the pore structure narrowed, showing A good shape selectivity; under high temperature zeolite acidic center plays a protective role; ammonia has a variety of adsorption centers; in the hydrogen conditions, a higher acidic cleavage activity.