3214-40-2Relevant academic research and scientific papers
Pd/Nb2O5/SiO2 catalyst for the direct hydrodeoxygenation of biomass-related compounds to liquid alkanes under mild conditions
Shao, Yi,Xia, Qineng,Liu, Xiaohui,Lu, Guanzhong,Wang, Yanqin
, p. 1761 - 1767 (2015)
A simple Pd-loaded Nb2O5/SiO2 catalyst was prepared for the hydrodeoxygenation of biomass-related compounds to alkanes under mild conditions. Niobium oxide dispersed in silica (Nb2O5/SiO2) as the support was prepared by the sol-gel method and characterized by various techniques, including N2 adsorption, XRD, NH3 temperature-programmed desorption (TPD), TEM, and energy-dispersive X-ray spectroscopy (EDAX) atomic mapping. The characterization results showed that the niobium oxide species were amorphous and well dispersed in silica. Compared to commercial Nb2O5, Nb2O5/SiO2 has significantly more active niobium oxide species exposed on the surface. Under mild conditions (170°C, 2.5 MPa), Pd/10 %Nb2O5/SiO2 was effective for the hydrodeoxygenation reactions of 4-(2-furyl)-3-buten-2-one (aldol adduct of furfural with acetone), palmitic acid, tristearin, and diphenyl ether (model compounds of microalgae oils, vegetable oils, and lignin), which gave high yields (>94 %) of alkanes with little C-C bond cleavage. More importantly, owing to the significant promotion effect of NbOx species on C-O bond cleavage and the mild reaction conditions, the C-C cleavage was considerably restrained, and the catalyst showed an excellent activity and stability for the hydrodeoxygenation of palmitic acid with almost no decrease in hexadecane yield (94-95 %) in a 150 h time-on-stream test.
Energy-efficient production of 1-octanol from biomass-derived furfural-acetone in water
Xia, Qineng,Xia, Yinjiang,Xi, Jinxu,Liu, Xiaohui,Wang, Yanqin
, p. 4411 - 4417 (2015/08/11)
An energy-efficient catalytic system for the one-pot production of 1-octanol from biomass-derived furfural-acetone (FFA) under mild conditions in water was developed, by sequential hydrogenation/hydrogenolysis over a hydrophilic Pd/NbOPO4 catalyst. A strategy of creating an intentional "phase problem" has been employed to prevent the over-hydrogenolysis of 1-octanol into n-octane and therefore increased the selectivity to 1-octanol. The effects of reaction conditions as well as a variety of noble-metal loaded bifunctional catalysts have been systematically investigated to maximize the yield of 1-octanol. Moreover, the addition of liquid acids to the catalytic system further enhanced the selectivity towards the formation of 1-octanol. There is a strong correlation between the acid strength of an acidic additive and the sum yield of 1-octanol and octane. With the addition of TfOH, the highest yield of 1-octanol (62.7%) was obtained from one-pot conversion of biomass-derived FFA over Pd/NbOPO4.
Pd/NbOPO4 multifunctional catalyst for the direct production of liquid alkanes from aldol adducts of furans
Xia, Qi-Neng,Cuan, Qian,Liu, Xiao-Hui,Gong, Xue-Qing,Lu, Guan-Zhong,Wang, Yan-Qin
supporting information, p. 9755 - 9760,6 (2015/01/16)
Great efforts have been made to convert renewable biomass into transportation fuels. Herein, we report the novel properties of NbO x-based catalysts in the hydrodeoxygenation of furan-derived adducts to liquid alkanes. Excellent activity and st
SELECTIVITY OF TETRAHYDROFURAN FORMATION FROM UNACTIVATED ALIPHATIC ALCOHOLS BY THE BROMINE-SILVER-SALT REACTION
Roscher, Nina Matheny,Shaffer, D. Kent
, p. 2643 - 2650 (2007/10/02)
Studies of the bromine-silver carbonate reaction with aliphatic alcohols in which intramolecular δ-H competition is possible are generally quite specific.Loss of a tertiary δ- hydrogen occurs preferentially from both tertiary and secondary aliphatic alcohols to yield the most highly substituted cyclic ether.For example, 2,5-dimethyl-2-octanol yields only 2,2,5-trimethyl-5-propyltetrahydrofuran as the cyclic ether product; 2-methyl-2-isopentyltetrahydrofuran is not detected.
FERROUS ION INDUCED DECOMPOSITION OF ALKYL HYPOCHLORITES
Cekovic, Zivorad,Djokic, Gordana
, p. 4263 - 4268 (2007/10/02)
The decomposition of primary, secondary and tertiary alkyl hypochlorites induced by ferrous and other one-electron oxidizable metal ions leads to δ-chloro alcohols in yields of 34-76percent.In decomposition of tertiary alkyl hypochlorites, β-fragmentation competes with intramolecular δ-chlorination.Tertiary cycloalkyl hypochlorites containing five- or six-membered rings undergo β-cleavage giving the corresponding ο-chloro ketones, while 1-methylcycloheptyl and 1-methylcyclooctyl hypochlorites by decomposition with ferrous ion proceed by transannular functionalization of δ-carbon atom and β-cleavage as a competing reaction.
