Five kinds of BZSM-5 molecular sieve with different Si/B ratio and a SiZSM-5 molecular sieve were prepared by hydrothermal synthesis method followed by acid exchange and pelletization. The samples were characterized by XRD

SEM

FT-IR

ICP

low temperature N

2

physical adsorption and desorption

NH

3

-TPD and Py-IR. The catalytic performance in the reaction of methanol to hydrocarbons was evaluated in the fixed bed reactor. Compared with SiZSM-5

the amount and strength of Brönsted (B) acid were enhanced by introducing skeleton boron and the activity of the catalyst was greatly improved. The characterization and evaluation results indicated that the BZSM-5 catalyst synthesized from the gel of SiO

2

/B

2

O

3

20 with Si/B ratio 74.48 had modest acidity strength

acid amount of 0.18mmol NH

3

·g

-1

and large mesopore volume of 0.23cm

3

·g

-1

. The B acid ratio was higher and the acid strength of BZSM-5 was weaker than that of AlZSM-5

which could inhibit the deep coke formation and increase the activity stability. B-2 had the best lifetime which could reach 672h under the same ev

aluation reaction conditions

due to the best matching of moderate acidity and good diffusion properties.