278426 Hydrogenation of Pyrolysis Oil Derived From Lignin

Tuesday, October 30, 2012: 10:10 AM
303 (Convention Center )
Wei Mu1, Haoxi Ben2, Arthur J. Ragauskas3 and Yulin Deng1, (1)School of chemical and biomolecular engineering, Georgia Institute of Technology, Atlanta, GA, (2)School of Chemistry & Biochemistry , Georgia Institute of Technology, Atlanta, GA, (3)School of Chemistry & Biochemistry, Atlanta, GA

Pyrolysis is recognized as one of the most economical ways to convert solid lignin to liquid. However, the oil products from this process cannot be directly used as a fuel. The major problems are instability, high acidity and low heating value. In our study, the heavy oil portion from pyrolysis oil was used for the raw material. Two-step hydrotreatments were applied and three catalysts, Ruthenium, Platinum and Palladium on carbon were evaluated with Ruthenium showing the best result. The other two catalysts could not achieve 100% conversion. After the reaction, all aromatic rings converted to aliphatic structure. Fewer methoxy groups with an increase in C-O aliphatic bonds were observed. The decrease of C=O bonds indicated the carbonyl groups were reduced to hydroxyl groups. During the first-step hydrotreatment, the surface of catalyst was blocked by the tar and coke formed in the reaction. Therefore, a second-step hydrotreatment was appended by replenishing the fresh catalyst. The mechanism of hydrogenation was studied and a reaction path was proposed. How the substituent group on aromatic ring would affect the reaction was also evaluated. NMR was extensively used in our research, including proton NMR, 13C NMR, 2-D HSQC NMR and DEPT-analysis. The NMR technology has non-destructive property, which is superior to the traditional GC-MS analysis. The NMR could also provide statistical distribution of carbon atom and hydrogen atom in different chemical environment, which gives a better insight of the reaction mechanism.

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