Catalytic Pyrolysis of Lignin for Bio oils

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1 Catalytic Pyrolysis of Lignin for Bio oils Haoxi Ben and Arthur Ragauskas Georgia Institute of Technology Institute of Paper Science and Technology

2 2

3 Kraft Pulp Mill Byproduct in black liquor ~ ton/year lignin A potential source of bio power Science. 2006, 311, Pyrolysis oil ~50 70% Biomass Kraft lignin Pyrolysis ~500 o C o C Additives Char Gas ~15 25% ~15 25% Energy & Fuels 2006,20,

4 Proportion of major linkages in softwood lignin Linkage β 4 α C linkage R H 4 R H H Chem. Rev. 2010, 110, Softwood (%) N/A 4 7 N/A β β 1 β β H H H 1 C C linkage Softwood (%) N/A

5 Pyrolysis of softwood kraft lignin Quartz tube Furnace Nitrogen flow Sample boat Condenser Pyrolysis N 2 flow o C + + Liquid Nitrogen Lignin Heavy oil Light oil Char 5

6 Pyrolysis of SW kraft lignin at different temperatures Yields of pyrolysis products Temperature Weight % of lignin Char Heavy oil The higher temperature The higher yield of oil? Primary pyrolysis: lignin pyrolysis oil + char + gas Secondary decomposition reaction: pyrolysis oil gas 700 o C is the point of those two competitive reactions 6

7 Characterization of pyrolysis oils pyrolysis o C 30 min + Lignin Heavy oil Light oil pyrolysis o C 30 min Chem. Rev. 2010, 110, How to analyze such complex pyrolysis mixtures? 7

8 Quantitatively determine hydroxyl functional groups by 31 P NMR TMDP P Cl H CDCl 3 pyridine P HCl phenolic H ppm Reactions of the phosphorous reagent (TMDP) with hydroxyl functional groups and the 31 P NMR assignment of phosphitylated compounds 8

9 Quantitatively determine water by 31 P NMR Reactions of the phosphorous reagent (TMDP) with water and the 31 P NMR assignment of phosphitylated compounds 9

10 Hydroxyl group contents of heavy oils and lignin Heavy oils and lignin mmol/g CH 3 β Guaiacyl Catechol p hydroxy phenyl 10 H

11 Hydroxyl group contents of heavy oils and lignin Heavy oils and lignin Hydroxyl groups contents Pyrolysis oil < lignin mmol/g Hydroxyl groups contents Pyrolysis oil > lignin CH 3 H β Guaiacyl Catechol p hydroxy phenyl 11

12 The possible decomposition pathways of ether bond R R (8) + H (1) (6) (11) -CH 3 -H +H +H -H 2 C= H H R (2) R R (9) (10) (7) (12) 1,6- shift -CH 3 +H +H +H + H H R H (3) (5) (4) R H (13) 12

13 Major components in light oils Light oils Heavy oil w/w% in light oil Light oil 13

14 Molecular weight of heavy oils Heavy oils 14

15 Quantitative 13 C NMR analysis of heavy oils Heavy oils and lignin % of total carbon 15

16 Summary of pyrolysis of SW kraft lignin at different temperatures 700 o C is the point of primary decomposition of lignin and the secondary decomposition of pyrolysis oil. The aliphatic H, carbonyl and methoxyl group and the ether bond in the lignin are the primary target functional groups to decompose during the pyrolysis 16

17 Pyrolysis of SW kraft lignin with additives Negative properties, high oxygen content, high acidity and viscosity. Zeolite has the potential to convert oxygenated organic compounds into hydrocarbons. Nickel salt has also been studied as a catalyst of pyrolysis 17 Energy & Fuels 2004, 18, J catal. 1977, 47, Russian journal of physical chemistry A 2009, 83,

18 Pyrolysis of SW kraft lignin with additives NiCl 2, H ZSM 5 and Ni ZSM 5 were used as the additives. The pyrolysis samples were mechanical mixed. Ni ZSM 5 was prepared by ion exchange of H ZSM 5 with 0.1/1.0 (W NiCl2 /W zeolite ) NiCl 2. Additives No additives NiCl 2 /lignin H-ZSM-5 /lignin H-ZSM-5 /lignin Ni-ZSM-5 /lignin Additive-tolignin weight 0: : : : :1.0 ratio Pyrolysis at 700 o C. 18

19 Pyrolysis of SW kraft lignin with additives Yields of pyrolysis products Pyrolysis at 700 o C Weight % of lignin Primary pyrolysis: lignin pyrolysis oil + char + gas Secondary decomposition reaction: pyrolysis oil gas Zeolite Secondary decomposition 19

20 Hydroxyl group contents of heavy oils and lignin Heavy oils and lignin mmol/g H β Guaiacyl Catechol p hydroxy phenyl CH 3 20

21 Hydroxyl group contents of heavy oils and lignin Heavy oils and lignin Aliphatic H Acid H mmol/g H β Guaiacyl Catechol p hydroxy phenyl CH 3 21

22 Major components in light oils Light oils Zeolite w/w% in light oil decomposition of the aliphatic H and carboxyl groups in lignin 22

23 Molecular weight of heavy oils Heavy oils 23

24 Quantitative 13 C NMR analysis Heavy oils and lignin of heavy oils % of total carbon zeolite all the C bonds in heavy oil The heavy oil has a relatively lower oxygen content 24

25 Conclusions H ZSM 5 zeolite could improve the decomposition of all the primary decomposed functional groups during the pyrolysis. After the use of H ZSM 5 zeolite as additive, the heavy oil contains less carboxyl hydroxyl groups less acidity, less C bonds less oxygen content, and has a lower molecular weight. 25

26 Acknowledgments Dr. Ragauskas Group Institute of Paper Science and Technology Georgia Institute of Technology School of Chemistry at Georgia Tech 26

27 Questions? 27

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