1. College of Electrical Engineering and Control Science, Nanjing Tech University, Nanjing 211816, China 2. Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, Institute of Electromagnetics and Acoustics, Department of Electronic Science, College of Electronic Science and Technology, Xiamen University, Xiamen 361005, China 3. School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane, Queensland 4000, Australia
Non-thermal plasma exhibits unique advantages in biomass conversion for the sustainable production of higher-value energy carriers. Different homogeneous catalysts are usually required for plasma-enabled biomass liquefaction to achieve time-and energy-efficient conversions. However, the effects of such catalysts on the plasma-assisted liquefaction process and of the plasma on those catalysts have not been thoroughly studied. In this study, an electrical discharge plasma is employed to promote the direct liquefaction of sawdust in a mixture of polyethylene glycol 200 and glycerol. Three commonly used chemicals, sulfuric acid, nitric acid and sodium p-toluene sulfate, were selected as catalysts. The effects of the type of catalyst and concentration on the liquefaction yield were examined; further, the roles of the catalysts in the plasma liquefaction process have been discussed. The results showed that the liquefaction yield attains a value of 90% within 5 min when 1% sulfuric acid was employed as the catalyst. Compared with the other catalysts, sulfuric acid presents the highest efficiency for the liquefaction of sawdust. It was observed that hydrogen ions from the catalyst were primarily responsible for the significant thermal effects on the liquefaction system and the generation of large quantities of active species; these effects directly contributed to a higher efficacy of the plasma-enabled liquefaction process.
A B Koven, S S Tong, R R Farnood, C Q Jia. Alkali-thermal gasification and hydrogen generation potential of biomass. Frontiers of Chemical Science and Engineering, 2017, 11(3): 369–378 https://doi.org/10.1007/s11705-017-1662-y
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S He, J Boom, R van der Gaast, K Seshan. Hydro-pyrolysis of lignocellulosic biomass over alumina supported Platinum, Mo2C and WC catalysts. Frontiers of Chemical Science and Engineering, 2017, 12(1): 155–161 https://doi.org/10.1007/s11705-017-1655-x
3
R Ravindran, C Sarangapari, S Jaiswal, P J Cullen, A K Jaiswal. Ferric chloride assisted plasma pretreatment of lignocellulose. Bioresource Technology, 2017, 243: 327–334 https://doi.org/10.1016/j.biortech.2017.06.123
4
Z M A Bundhoo. Microwave-assisted conversion of biomass and waste materials to biofuels. Renewable & Sustainable Energy Reviews, 2018, 82(1): 1149–1177 https://doi.org/10.1016/j.rser.2017.09.066
C Du, J Wu, D Ma, Y Liu, P Qiu, R Qiu, S Liao, D Gao. Gasification of corn cob using non-thermal arc plasma. International Journal of Hydrogen Energy, 2015, 40(37): 12634–12649 https://doi.org/10.1016/j.ijhydene.2015.07.111
7
A R K Gollakotaa, N Kishore, S Gu. A review on hydrothermal liquefaction of biomass. Renewable & Sustainable Energy Reviews, 2018, 81(1): 1378–1392 https://doi.org/10.1016/j.rser.2017.05.178
8
S Mohapatra, C Mishra, S S Behera, H Thatoi. Application of pretreatment, fermentation and molecular techniques for enhancing bioethanol production from grass biomass—A review. Renewable & Sustainable Energy Reviews, 2017, 78: 1007–1032 https://doi.org/10.1016/j.rser.2017.05.026
9
J D Shin, S G Hong, W S Choi, S K Park. Crude oil production and classification of organic compounds on super-critical liquefaction with rice hull. Biotechnology and Bioprocess Engineering, 2013, 18(5): 956–964 https://doi.org/10.1007/s12257-013-0122-x
10
K Tekin, S Karagöz, S Bektas. A review of hydrothermal biomass processing. Renewable & Sustainable Energy Reviews, 2014, 40: 673–687 https://doi.org/10.1016/j.rser.2014.07.216
11
E M Hassan, N Shukry. Polyhydric alcohol liquefaction of some lignocellulosic agricultural residues. Industrial Crops and Products, 2008, 27(1): 33–38 https://doi.org/10.1016/j.indcrop.2007.07.004
12
S Jiang, H Daly, H Xiang, Y Yan, H Zhang, C Hardacre, X Fan. Microwave-assisted catalyst-free hydrolysis of fibrous cellulose for deriving sugars and biochemical. Frontiers of Chemical Science and Engineering, 2019, 13(4): 718–726 https://doi.org/doi.org/10.1007/s11705-019-1804-5
13
E C Neyts. Atomistic simulations of plasma catalytic processes. Frontiers of Chemical Science and Engineering, 2018, 12(1): 145–154 https://doi.org/10.1007/s11705-017-1674-7
14
C Zhang, H Lin, S Zhang, Q Xie, C Ren, T Shao. Plasma surface treatment to improve surface charge accumulation and dissipation of epoxy resin exposed to DC and nanosecond-pulse voltages. Journal of Physics. D, Applied Physics, 2017, 50(40): 405203 https://doi.org/10.1088/1361-6463/aa829b
15
R S Zhou, R W Zhou, X H Zhang, K Bazaka, K Ostrikov. Continuous flow removal of acid fuchsine by dielectric barrier discharge plasma water bed enhanced by activated carbon adsorption. Frontiers of Chemical Science and Engineering, 2019, 13(2): 340–349 https://doi.org/10.1007/s11705-019-1798-z
16
X Fang, C Corbella, D B Zolotukhin, M Keidar. Plasma-enabled healing of graphene nano-platelets layer. Frontiers of Chemical Science and Engineering, 2019, 13(2): 350–359 https://doi.org/10.1007/s11705-018-1787-7
17
A Molino, S Chianese, D Musmarra. Biomass gasification technology: The state of the art overview. Journal of Energy Chemistry, 2016, 25(1): 10–25 https://doi.org/10.1016/j.jechem.2015.11.005
18
V S Sikarwar, M Zhao, P Clough, P Yao, X Zhong, M Z Memon, N Shah, E J Anthony, P S Fennell. An overview of advances in biomass gasification. Energy & Environmental Science, 2016, 9(10): 2939–2977 https://doi.org/10.1039/C6EE00935B
19
S Y Liu, D H Mei, M A Nahil, S Gadkari, S Gu, P T Williams, X Tu. Hybrid plasma-catalytic steam reforming of toluene as a biomass tar model compound over Ni/Al2O3 catalysts. Fuel Processing Technology, 2017, 166: 269–275 https://doi.org/10.1016/j.fuproc.2017.06.001
20
D Xi, R S Zhou, R W Zhou, X H Zhang, L Ye, J Li, C Jiang, Q Chen, G Sun, Q Liu, S Yang. Mechanism and optimization for plasma electrolytic liquefaction of sawdust. Bioresource Technology, 2017, 241: 545–551 https://doi.org/10.1016/j.biortech.2017.05.132
21
R S Zhou, R W Zhou, S Wang, Z Lan, X H Zhang, Y Yin, S Tu, S Z Yang, L Ye. Fast liquefaction of bamboo shoot shell with liquid-phase microplasma assisted technology. Bioresource Technology, 2016, 218: 1275–1278 https://doi.org/10.1016/j.biortech.2016.07.042
J Akhtar, N A S Amin. A review on process conditions for optimum bio-oil yield in hydrothermal liquefaction of biomass. Renewable & Sustainable Energy Reviews, 2011, 15(3): 1615–1624 https://doi.org/10.1016/j.rser.2010.11.054
24
K H Kim, Y J Jo, C G Lee, E Lee. Solvothermal liquefaction of microalgal Tetraselmis sp. biomass to prepare biopolyols by using PEG 400-blended glycerol. Algal Research, 2015, 12: 539–544 https://doi.org/10.1016/j.algal.2015.08.007
25
G W Huber, S Iborra, A Corma. Synthesis of transportation fuels from biomass: Chemistry, catalysts and engineering. Chemical Reviews, 2006, 106(9): 4044–4098 https://doi.org/10.1021/cr068360d
26
T Zhang, Y Zhou, D Liu, L Petrus. Qualitative analysis of products formed during the acid catalyzed liquefaction of bagasse in ethylene glycol. Bioresource Technology, 2007, 98(7): 1454–1459 https://doi.org/10.1016/j.biortech.2006.03.029
27
X Zou, T Qin, L Huang, X Zhang, Z Yang, Y Wang. Mechanisms and main regularities of biomass liquefaction with alcoholic solvents. Energy & Fuels, 2009, 23(10): 5213–5218 https://doi.org/10.1021/ef900590b
28
J J Qiao, L Zhang, D Z Yang, Z X Jia, Y Song, Z L Zhao, H Yuan, Y Xia, W C Wang. Temporal evolution of the relative vibrational population of N2 (C3Pu) and optical emission spectra of atmospheric pressure plasma jets in He mixtures. Journal of Physics. D, Applied Physics, 2019, 52(28): 285203 https://doi.org/10.1088/1361-6463/ab1110
29
X Lu, G V Naidis, M Laroussi, S Reuter, D B Graves, K Ostrikov. Reactive species in non-equilibrium atmospheric-pressure plasmas: Generation, transport and biological effects. Physics Reports, 2016, 630: 1–84 https://doi.org/10.1016/j.physrep.2016.03.003