Catalytic gasification of lignin with Ni/Al2O3–SiO2 in sub/supercritical water |
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| Affiliation: | 1. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China;2. The Key Lab of Pollution control and Ecosystem restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou 510006, China;3. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510006, China;1. Department of Chemistry, University of Bergen, Norway, Allegaten 41, N-5007 Bergen, Norway;2. Department of Chemical and Environmental Engineering, School of Engineering, University of the Basque Country (EHU/UPV), C/Alameda Urquijo s/n, 48013 Bilbao, Spain;1. Department of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran;2. NFCRS, Nuclear Science and Technology Research Institute, End of North Karegar Ave., Tehran, Iran;1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. The College of Engineering, Department of Mechanical Thermal Engineering and Chemical & Material Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia;3. Technical R&D Department, Shaanxi Yanchang Petroleum (Group) Co., Ltd, Xi''an 710075, China |
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| Abstract: | Lignin has been gasified with a Ni/Al2O3–SiO2 catalyst in sub/supercritical water (SCW) to produce gaseous fuels. XRD pattern at 6θ angle shows characteristic peaks of crystalline NiO, NiSi, and AlNi3, suggesting that Al2O3–SiO2 not only offers high surface area (122 m2 g) for Ni, but also changes the crystal morphology of the metal. 9 mmol/g of H2 and 3.5 mmol/g of CH4 were produced at the conditions that 5.0 wt% alkaline lignin plus 1 g/g Ni/Al2O3–SiO2 operating for 30 min at 550 °C. A kinetic model was also developed, and the activation energies of gas and char formation were calculated to be 36.68 ± 0.22 and 9.0 ± 2.4 kJ/mol, respectively. Although the loss of activity surface area during reuse caused slight activity reduction in Ni/Al2O3–SiO2, the catalyst system still possessed high catalytic activity in generating H2 and CH4. It is noted that sulfur linkage could be hydrolyzed to hydrogen sulfide in the gasification process of alkaline lignin. The stable chemical states of Ni/Al2O3–SiO2 grants its insensitivity to sulfur, suggesting that Ni/Al2O3–SiO2 should be economically promising for sub/supercritical water gasification of biomass in the presence of sulfur. |
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| Keywords: | Catalysis Gasification Lignin Supercritical water |
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