In this study,Z418 catalyat was roasted and then quenched for many times,and the quenched series of catalysts were obtained.The physicochemical properties of the catalysts were characterized by scanning electron microscope(SEM),isothermal nitrogen adsorption and desorption(BET),X-ray diffraction(XRD),hydrogen-programmed temperature reduction(H2-TPR)and X-ray photoelectron spectroscopy(XPS),and the structure-activity rela-tionship of the catalysts was thoroughly studied.The results showed that:the high temperature roasting and quenching treatment caused the agglomeration of NiO grains on the surface of Z418 and the formation of NiAl2O4 spinel,which was difficult to reduce,so reduction temperature of the catalyst was increased.Although part pore structure of the catalyst was damaged by roasting-quenching treatment and mechanical strength of the catalyst was lowered,metal carrier inter-action and surface mobility of oxygen were strenghthened by the form of NiAl2O4 spinel.The ac-tivity evaluation result showed that activity of the catalyst after roasting-quenching treatment was slightly decreased,but industrial operation requirements could be still meet.
Z418 catalystroastingquenchingNiAl2O4 spinelsteam conversion of hy-drocarbons to hydrogen
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