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| Study on Preparation of Carbon-based Solid Acid Derived from Kraft Lignin by Sol-Gels and Its Catalytic Hydration for α-Pinene |
| Received:December 16, 2020 |
| DOI：10.11981/j.issn.1000-6842.2021.04.09 |
| Key Words:sol-gel method;lignin hydrogel;carbon-based solid acid;catalytic hydration;α-terpineol |
| Fund Project:广西民族大学研究生教育创新计划（gxun-chxzs2019017）；国家自然科学基金项目（31660180）。 |
| Author Name | Affiliation | Postcode | | WANG Jing | Key Laboratory of Chemistry and Engineering of Forest Products， State Ethnic Affairs Commission， Guangxi Key Laboratory of Chemistry and Engineering of Forest Products， Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products， College of Chemistry and Chemical Engineering， Guangxi University for Nationalities， Nanning， Guangxi Zhuang Autonomous Region， 530006 | 530006 | | FENG Bo | Key Laboratory of Chemistry and Engineering of Forest Products， State Ethnic Affairs Commission， Guangxi Key Laboratory of Chemistry and Engineering of Forest Products， Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products， College of Chemistry and Chemical Engineering， Guangxi University for Nationalities， Nanning， Guangxi Zhuang Autonomous Region， 530006 | 530006 | | CHE Junda | Key Laboratory of Chemistry and Engineering of Forest Products， State Ethnic Affairs Commission， Guangxi Key Laboratory of Chemistry and Engineering of Forest Products， Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products， College of Chemistry and Chemical Engineering， Guangxi University for Nationalities， Nanning， Guangxi Zhuang Autonomous Region， 530006 | 530006 | | LUO Jinyue | College of Chemical Engineering， Nanjing Forestry University， Nanjing， Jiangsu Province， 210037 | 210037 | | LIU Zuguang | Key Laboratory of Chemistry and Engineering of Forest Products， State Ethnic Affairs Commission， Guangxi Key Laboratory of Chemistry and Engineering of Forest Products， Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products， College of Chemistry and Chemical Engineering， Guangxi University for Nationalities， Nanning， Guangxi Zhuang Autonomous Region， 530006 | 530006 |
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| Abstract: |
| Kraft lignin， obtained from sulfate pulping black liquor， was used to synthesize hydrogel by sol-gel method， and then the hydrogel was dried by vacuum， followed by carbonization and sulfonation using concentrated sulfuric acid to obtain lignin carbon-based solid acid which was characterized and analyzed using FT-IR， SEM， BET specific surface area method， and Boehm titration and was further used in catalyzing α-pinene to synthesize α-terpineol. The results showed that the carbon-based solid acid prepared by sol-gel method was of rich pore structure with a BET specific surface area of 281.25 m2/g， the conversion rate of α-pinene of 93.1%， the yield of α-terpineol of 40.4%， and the selectivity of 43.4%. After the catalyst was recycled for 5 times， the conversion rate of α-pinene decreased to 86.7% and the yield of α-terpineol decreased to 32.6%. The root cause for the decline of catalytic performance of lignin carbon-based solid acid after recycling was the fall-off of sulfonic groups on its surface. |
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