TY - JOUR
T1 - Comparison of kinetics and reaction pathways for hydrodeoxygenation of C 3 alcohols on Pt/Al 2O 3
AU - Peng, Baoxiang
AU - Zhao, Chen
AU - Mejía-Centeno, Isidro
AU - Fuentes, Gustavo A.
AU - Jentys, Andreas
AU - Lercher, Johannes A.
PY - 2012/3/20
Y1 - 2012/3/20
N2 - The catalytic hydrodeoxygenation of C 3 alcohols (1- and 2-propanol, 1,2- and 1,3-propanediol, and glycerol) on Pt/Al 2O 3 has been mechanistically explored in the aqueous phase. Dehydrogenation on Pt and dehydration on alumina are the main elementary reaction pathways. In water, carbon-carbon bond cleavage for alcohols with terminal hydroxyl groups occurs via decarbonylation of aldehydes (generated by dehydrogenation of alcohols) and decarboxylation of acids, the latter being formed by disproportionation from aldehydes. The presence of water as solvent suppresses the dehydration for mono-alcohols mainly via blocking of Lewis acid sites by water. Dehydration is still the dominating primary reaction for 1,3-propanediol and glycerol, as the higher number of hydroxyl groups weakens the C-O bond strength. The overall reactivity of C 3 alcohols decreases in the order of 1,3-propanediol ≈ glycerol > 1,2-propanediol ≈ 1-propanol.
AB - The catalytic hydrodeoxygenation of C 3 alcohols (1- and 2-propanol, 1,2- and 1,3-propanediol, and glycerol) on Pt/Al 2O 3 has been mechanistically explored in the aqueous phase. Dehydrogenation on Pt and dehydration on alumina are the main elementary reaction pathways. In water, carbon-carbon bond cleavage for alcohols with terminal hydroxyl groups occurs via decarbonylation of aldehydes (generated by dehydrogenation of alcohols) and decarboxylation of acids, the latter being formed by disproportionation from aldehydes. The presence of water as solvent suppresses the dehydration for mono-alcohols mainly via blocking of Lewis acid sites by water. Dehydration is still the dominating primary reaction for 1,3-propanediol and glycerol, as the higher number of hydroxyl groups weakens the C-O bond strength. The overall reactivity of C 3 alcohols decreases in the order of 1,3-propanediol ≈ glycerol > 1,2-propanediol ≈ 1-propanol.
KW - Aqueous phase
KW - Decarbonylation
KW - Decarboxylation
KW - Disproportionation
KW - Glycerol
KW - Hydrodeoxygenation of alcohols
UR - https://www.scopus.com/pages/publications/84857944318
U2 - 10.1016/j.cattod.2011.10.022
DO - 10.1016/j.cattod.2011.10.022
M3 - 文章
AN - SCOPUS:84857944318
SN - 0920-5861
VL - 183
SP - 3
EP - 9
JO - Catalysis Today
JF - Catalysis Today
IS - 1
ER -