CuOZnOZrO2 catalyst was modified by combustion method, using Al2O3, CeO2, NiO metal oxides as promoters. The effects of Al2O3, CeO2, NiO on phase composition and catalyst structure were illuminated by using Xraydiffraction (XRD), temperatureprogrammed reduction ofhydrogen(H2TPR), temperatureprogrammed desorption of hydrogen (H2TPD) and carbon dioxide (CO2TPD) techniques. And the effects of the three chosen promoters on catalytic performance for CO2 hydrogenation to methanol were studied in a fixedbed plug flow reactor. The results indicated that the three promotes of Al2O3, CeO2, NiO all contributed to improving theactivity of catalysts and CeO2modified catalyst had best catalytic performance. Moreover, the three promotes all could inhibit CuO crystal grain growth and improve the dispersion of CuO, which could benefit the reduction of catalysts and H2 adsorptiondissociation. Besides that, the three metal oxides could modulate the intensity amount of basic sites on the catalyst surface in different degrees. Comparing with NiOmodified catalyst, CeO2modified catalyst and Al2O3 modified catalyst both possessed higher basic intensity and more basia sites, which led to CO2 adsorptionactivation easily.

The effect of hydrothermal synthesis conditions on both relative crystallinity and phase purity of ZSM22 zeolites was investigated in SiO ₂Al ₂O ₃K ₂ODAHH ₂O system, hereby DAH referring to 1,6diaminohexane as template. The resulting samples were characterized by powder Xray diffraction (XRD) and inductively coupled plasma (ICP) analyses in order to examine the structure, XRD phase, and chemical composition. As a result, several ZSM22 zeolites with the higher phase purity were synthesized at respective temperatures from 433 K up to 438 K by use of the different gels which involved SiO ₂/Al ₂O ₃ molar ratios of 80~100 and OH ^-/SiO ₂ molar ratios of 0.33~0.35. It is found that the relative crystallinity and phase purity of ZSM22 zeolites markedly varied as a function of crystallization temperature, SiO ₂/Al ₂O ₃ and OH ^-/SiO ₂ molar ratios. In fact, an adequate increase in crystallization temperature improves on ZSM22 phase purity, followed a significant enhancement of relative crystallinity. Although the ZSM5 crystal growth takes place predominantly in the solid phase, the decrease in the range of SiO ₂/Al ₂O ₃ ratio less than 80 leads to a gradual increase in the ZSM5 phase fraction while the increase in SiO ₂/Al ₂O ₃ ratio larger than 110 also enhances the phase fraction of cristobalite. Furthermore, Si/Al atomic ratios in ZSM22 framework located the range of 41.8~53.4, and by correlating the Si/Al ratio of ZSM22 framework with the SiO ₂/Al ₂O ₃ ratio of aluminosilicate gels, it is noted that the nominal ratios in ZSM22 framework tended to shift towards the center of the Si/Al ratio interval mentioned above.