ZHANG Xiangjing, MA Renjuan, SUN Ruiyu, et al. Deactivation of HZSM-5 catalyst in methanol to gasoline[J]. CIESC Journal, 2015, (9): 3483-3489.DOI: 10.11949/j.issn.0438-1157.20150891.
The catalytic performances and the main deactivation mode of HZSM-5 zeolite were investigated by methanol to gasoline (MTG) reaction in a stainless-steel fixed bed reactor. The catalyst was characterized by means of techniques such as TGA-DTA
XRD
FT-IR
N2 adsorption-desorption and GC-MS. The results showed that the methanol conversion was 40% and the gasoline yield could drop to 12.6% after 336 h for the reaction
resulting in the serious deactivation of HZSM-5 catalyst. However
the regenerated catalyst at 700℃ in the air had high activity and the MFI framework structure. It was found that the coke
which deposited mainly on micropores of HZSM-5
was the main reason for catalyst deactivation. The main components of coke deposits were polymer with double bond or/and polycyclic aromatic hydrocarbon.