SHANG Hongyan, ZHANG Qingqing, YOU Peipei, et al. lnfluence of alkali metals-modification on catalytic properties of SAPO-34[J]. CIESC Journal, 2015, (4): 1331-1336.
SHANG Hongyan, ZHANG Qingqing, YOU Peipei, et al. lnfluence of alkali metals-modification on catalytic properties of SAPO-34[J]. CIESC Journal, 2015, (4): 1331-1336.DOI: 10.11949/j.issn.0438-1157.20141741.
The catalysts prepared by modifying SAPO-34 zeolite with alkali metals(Li
Na
K
Rb
Cs) in the way of incipient-wetness impregnation method were evaluated using methanol-olefin(MTO) reaction in the normal pressure continuous flowing fixed bed reactor. The structures of modified SAPO-34 catalysts were characterized by XRD
FT-IR
NH3-TPD. The results show that lower olefins selectivity and lifetime are improved for 2% alkali-modified SAPO-34
compared with unmodified SAPO-34
except Cs-modified SAPO-34. Ethylene and propylene selectivity of Li-modified SAPO-34 catalyst are about 77% and its lifetime are prolonged by 2.5 times. After regeneration for three times
the selectivity of ethylene and propylene remains almost the same.