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 47
- Downloads 1
Current status and application prospects of industrial carbon emission data platforms at home and abroad
China is currently the country with the largest carbon emissions in the word, with industrial carbon emissions accounting for approximately 68% of the global carbon emissions. Under the "double control" of total amount a...
Changes of Physicochemical Characteristics of Microplastics During Water Disinfection Processes: A Review
Microplastic pollution in aquatic environments has drawn widespread attention. In addition to the toxicity and ecological risks, microplastics can act as carriers of various pollutants. In water disinfection processes, d...
Research progress of microalgae carbon sequestration coupled with industrial wastewater treatment technology
The industrial wastewater treatment industry is an integral part of China's modernization process and plays an important role in the course of industrialization. However, the traditional wastewater treatment process cons...
Main factors influencing the electro-methanation of CO_2 in microbial electrolytic cells and the role of electron intermediates
Greenhouse gas emissions from fossil fuel combustion have led to global ecological degradation and energy crisis. Therefore, it is urgent to explore new technologies for the conversion, reuse and clean energy production...
Effects of surface Pt modification on titanium nanotubes for photocatalytic methylamine oxidation
In this study, PtCl_x, PtO_x and Pt^0 modified titanium dioxide nanotubes (TNTs) materials were prepared by impregnation, precipitation-calcination and photodeposition methods, and were applied to the photocatalytic degr...