In this work

four different AlOOH catalysts prepared by complete liquid-phase technology

hydrothermal and precipitation method are investigated and the industrial AlOOH(SB)is used as a control. These catalysts are characterized by XRD

NH3-TPD-MS

FT-IR

N2 adsorption-desorption and TG-DTG

and evaluated in a fixed-bed reactor for methanol dehydration. The results show that significant differences exist in these catalysts of methanol dehydration. The AlOOH catalyst prepared by compete liquid-phase technology followed by calcination for removing deposited carbon on the surface displays the highest activity and good stability

especially the performance in low temperature. On the contrary

the AlOOH catalyst prepared by precipitation method shows the worst activity and bad stability. Combined characterization results with catalytic performance

it can be found that the AlOOH catalyst has weak and strong acid sites

while γ-Al2O3 only has weak acid sites. When the content of weak acid sites is higher than its strong acid sites

the AlOOH catalyst shows better ability of methanol dehydration. On the other hand

more lattice defects and proper grain size of catalysts are beneficial to the improvement of the ability of methanol dehydration.