Effect of reaction temperature on Mo/Al_2O_3 catalytic hydrodeoxygenation of alkali lignin bio-oils
Journal Title: Energy Environmental Protection - Year 2024, Vol 38, Issue 2
Abstract
Alkali lignin, an important source of industrial lignin, can be used for producing aromatic components in biofuels while retaining its aromatic ring structure through hydrothermal liquefaction technology. The temperature during the reaction process significantly influences the bio-oil yield and composition. This study investigates the impact of reaction temperature on the oil yield and aromatics yield in the preparation of bio-oil through hydrothermal liquefaction of alkali lignin catalyzed by Mo/Al_2O_3. The study′s findings revealed that the oil yield initially increased and then decreased with increasing temperature, reaching its highest value at 280 ℃. As the temperature increased, the O/C ratio of the bio-oil continuously decreased to a minimum of 0.22. In contrast, the H/C ratio steadily increased to a maximum of 1.14. Additionally, the high calorific value steadily increased to a maximum of 30.41 MJ/kg. These results indicated that higher temperatures contributed to improving the fuel properties of the bio-oil. However, increasing the temperature was not conducive to the enrichment of aromatic components in the bio-oil. The higher the temperature, the lower the relative content of aromatic compounds and the higher the content of phenolic compounds in the bio-oil. The study observed that the relative content of aromatics reached its peak value of 34.1% at 260 ℃ when 15% Mo/Al_2O_3 was added as a catalyst. At this temperature, the selectivity to toluene in the aromatics product was as high as 97.7%, indicating the optimal enrichment of aromatics. In summary, the study demonstrates that the temperature during the hydrothermal liquefaction process of alkali lignin affects both the bio-oil yield and composition. While higher temperatures enhance the oil yield and fuel properties of the bio-oil, they also reduce the relative content of aromatic compounds. The addition of Mo/Al_2O_3 as a catalyst at an appropriate temperature can promote the enrichment of aromatics, where toluene is the dominant product.
Authors and Affiliations
CAO He|Key Laboratory of Clean Energy of Liaoning, College of Energy and Environment, Shenyang Aerospace University, China, YANG Tianhua*|Key Laboratory of Clean Energy of Liaoning, College of Energy and Environment, Shenyang Aerospace University, China, LI Bingshuo|Key Laboratory of Clean Energy of Liaoning, College of Energy and Environment, Shenyang Aerospace University, China, ZHANG Haijun|Key Laboratory of Clean Energy of Liaoning, College of Energy and Environment, Shenyang Aerospace University, China, TONG Yao|Key Laboratory of Clean Energy of Liaoning, College of Energy and Environment, Shenyang Aerospace University, China
Keywords
Related Articles
- EP ID EP737175
- DOI 10.20078/j.eep.20240208
- Views 55
- Downloads 1
Economic evaluation of biomass pyrolysis liquefaction technology based on life cycle assessment
In the context of the "dual carbon" goals, exploring the production of bio-gasoline and bio-diesel through a biomass energy and pyrolysis liquefaction production chain holds significant potential. This approach could hel...
Research Progress on Enhancing Acid Production from Anaerobic Fermentation of Waste Activated Sludge by Different Pretreatment Methods
The generation of waste activated sludge (WAS) in China has reached substantial levels, posing significant challenges in both disposal costs and environmental management. As urbanization and industrialization continue to...
Research progress in electrooxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid
With the increasing demand of alternative energy for achieving sustainable development, the effective utilization of biomass resources has become a research focus. 5-Hydroxymethylfurfural (HMF), as a biomass-based platfo...
Research progress on the mechanism of sulfur poisoning and resistance improvement of noble metal catalysts
SO_2 impurities are commonly encountered in practical industrial exhaust gases. During catalytic purification processes, SO_2 molecules compete with reactants for active sites. Particularly, SO_2 can undergo chemical rea...
Analysis on the development of high energy efficiency and low carbon in iron and steel enterprises
Low-carbon transition of iron and steel enterprises plays an important role in the efficient and low-carbon development of Chinese iron and steel enterprises and the realization of "double carbon" goal. This paper presen...