TY - JOUR
T1 - Effect of acidity of ZSM-5 zeolite on conversion of ethanol to propylene
AU - Furumoto, Yoshiyasu
AU - Harada, Yasumitsu
AU - Tsunoji, Nao
AU - Takahashi, Atsushi
AU - Fujitani, Tadahiro
AU - Ide, Yusuke
AU - Sadakane, Masahiro
AU - Sano, Tsuneji
PY - 2011/5/31
Y1 - 2011/5/31
N2 - Protonated ZSM-5 zeolites (HZSM-5(M), M = Al, Ga, and Fe) having different acid strengths were prepared under various synthesis conditions, and the effect of acidity of the ZSM-5 zeolite on the conversion of ethanol to propylene was investigated in detail. HZSM-5(Ga) and HZSM-5(Al) showed high propylene yields. However, HZSM-5(Fe) yielded ethylene instead of propylene, i.e., only dehydration of ethanol occurred on HZSM-5(Fe). These results indicate that the acid strength is a crucial factor for the selective production of propylene. In other words, for successful selective conversion of ethanol to propylene, HZSM-5(M) zeolites must contain acid sites with an acid strength that is more than that of HZSM-5(Ga). It was also found that phosphorous-modified HZSM-5(Ga) zeolite exhibited an improved propylene yield relative to the unmodified zeolite and that the modification considerably enhanced the catalytic stability because of the suppression of both elimination of framework gallium and coke deposition.
AB - Protonated ZSM-5 zeolites (HZSM-5(M), M = Al, Ga, and Fe) having different acid strengths were prepared under various synthesis conditions, and the effect of acidity of the ZSM-5 zeolite on the conversion of ethanol to propylene was investigated in detail. HZSM-5(Ga) and HZSM-5(Al) showed high propylene yields. However, HZSM-5(Fe) yielded ethylene instead of propylene, i.e., only dehydration of ethanol occurred on HZSM-5(Fe). These results indicate that the acid strength is a crucial factor for the selective production of propylene. In other words, for successful selective conversion of ethanol to propylene, HZSM-5(M) zeolites must contain acid sites with an acid strength that is more than that of HZSM-5(Ga). It was also found that phosphorous-modified HZSM-5(Ga) zeolite exhibited an improved propylene yield relative to the unmodified zeolite and that the modification considerably enhanced the catalytic stability because of the suppression of both elimination of framework gallium and coke deposition.
KW - Acidity
KW - Ethanol
KW - Phosphorous
KW - Propylene
KW - ZSM-5
UR - http://www.scopus.com/inward/record.url?scp=79956025752&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79956025752&partnerID=8YFLogxK
U2 - 10.1016/j.apcata.2011.04.009
DO - 10.1016/j.apcata.2011.04.009
M3 - Article
AN - SCOPUS:79956025752
VL - 399
SP - 262
EP - 267
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
SN - 0926-860X
IS - 1-2
ER -