
ACS Catalysis p. 1774 - 1785 (2013)
Update date:2022-08-11
Topics:
Mortensen, Peter M.
Grunwaldt, Jan-Dierk
Jensen, Peter A.
Jensen, Anker D.
Four groups of catalysts have been tested for hydrodeoxygenation (HDO) of phenol as a model compound of bio-oil, including oxide catalysts, methanol synthesis catalysts, reduced noble metal catalysts, and reduced non-noble metal catalysts. In total, 23 different catalysts were tested at 100 bar H2 and 275 C in a batch reactor. The experiments showed that none of the tested oxides or methanol synthesis catalysts had any significant activity for phenol HDO under the given conditions, which were linked to their inability to hydrogenate the aromatic ring of phenol. HDO of phenol over reduced metal catalysts could effectively be described by a kinetic model involving a two-step reaction in which phenol initially was hydrogenated to cyclohexanol and then subsequently deoxygenated to cyclohexane. Among reduced noble metal catalysts, ruthenium, palladium, and platinum were all found to be active, with activity decreasing in that order. Nickel was the only active non-noble metal catalyst. For nickel, the effect of support was also investigated and ZrO2 was found to perform best. Pt/C, Ni/CeO2, and Ni/CeO2-ZrO 2 were the most active catalysts for the initial hydrogenation of phenol to cyclohexanol but were not very active for the subsequent deoxygenation step. Overall, the order of activity of the best performing HDO catalysts was as follows: Ni/ZrO2 > Ni-V2O5/ZrO 2 > Ni-V2O5/SiO2 > Ru/C > Ni/Al2O3 > Ni/SiO2 Pd/C > Pt/C. The choice of support influenced the activity significantly. Nickel was found to be practically inactive for HDO of phenol on a carbon support but more active than the carbon-supported noble metal catalysts when supported on ZrO2. This observation indicates that the nickel-based catalysts require a metal oxide as a carrier on which the activation of the phenol for the hydrogenation can take place through heterolytic dissociation of the O-H bond to facilitate the reaction.
View More
Nanjing Fubang Chemical Co.,Ltd
Contact:+86-25-83179199
Address:5F,Tianzheng international plaza,No399 Zhongyang Road ,Nanjing China
Contact:410-273-7300; 800-221-3953
Address:4609 Richlynn Dr., PO Box 369, Belcamp, MD, 21017-0369, USA
Contact:(86) 731 88718666
Address:Room 1222, Unit 4, Building B, Shangcheng, No.47, Kaiyuan East Road.
Wuhan Chemchemical Co., Ltd.(expird)
Contact:15973022782
Address:7-5-6218,Incubation Centre,Guandong Industry Park, East Lake High-Tech Development Zone,Wuhan City.
Contact:27-792-602929
Address:SIDNEY MUFAMADI STREET 009949 X44 0700 POLOKWANE,LIMPOPO
Doi:10.1016/j.bbagen.2014.06.003
(2014)Doi:10.1016/0022-328X(83)85040-2
(1983)Doi:10.1016/S0040-4039(00)93730-4
(1976)Doi:10.1016/S0040-4039(00)76093-X
(1966)Doi:10.1016/S0022-5347(05)67673-2
()Doi:10.1039/b815008g
(2009)