Hồ Quốc Phong * , Huy?nh Die?p Ha?i Dang , Truong Vi? Ha? Huỳnh Liên Hương

* Tác giả liên hệ (hqphong@ctu.edu.vn)

Abstract

Acid catalyst C-SO3H was synthesized to replace traditional acid catalyst in order to reduce environmental impacts. The synthesis process was carried out through two steps: (i) formation of carbon particles; (ii) sulfonation of carbon to form catalyst. Glucose hydrothermal method at 180°C in 4 hours was used to generate carbon particles with size of 2-3 ?m and sulfonation of carbon particles by H2SO4 at different conditions was ultilized to create the catalyst. The results showed that reaction time and temperature strongly influenced the sulfonation process to form SO3H groups. However, carbon content in the acid solution was not significantly affected. In addition, using of the catalyst for hydrolyzing starch gave good results. The concentration of the total sugar increased with increase of concentration, temperature and reaction time. Moreover, when catalyzed by C-SO3H, the total sugar concentration was obtained at a value of 17,42 g/L that was higher than that of using 2% H2SO4 catalyst (obtained total sugar, 13,27 g/L).

Keywords: Carbon-based materials, solid acid catalyst, sulfonated carbonization

Tóm tắt

Xúc tác acid rắn C-SO3H đươ?c tô?ng hơ?p nhằm thay thế xúc tác acid truyền thống và làm giảm thiểu tác động xấu đến môi trường. Quá trình tổng hợp được thực hiện thông qua hai giai đoa?n: (i) tạo hạt carbon và (ii) sulfo hóa tạo xúc tác. Phương pháp thu?y nhiê?t đường ơ? 180°C trong 4 giơ? được sử dụng để tạo hạt carbon với kích thước khoảng 2-3 àm và quá trình sulfo hóa hạt carbon bằng H2SO4 ở các điều kiện khác nhau để tạo thành xúc tác. Trong đó, nhiệt độ và thời gian ảnh hưởng mạnh đến quá trình sulfo hóa để gắn kết nhóm SO3H. Tuy nhiên, hàm lượng carbon trong dung dịch acid không ảnh hưởng đáng kể. Thêm vào đó việc sử dụng xúc tác được tổng hợp cho quá trình thủy phân tinh bột cho kết quả khá tốt. Nồng độ đường tổng tăng theo hàm lượng, nhiệt độ và thời gian phản ứng. Hơn thế nữa, khi được xúc tác bằng C-SO3H, nồng độ đường tổng thu được đạt giá trị 17,42 g/L cao hơn khi sử dụng xúc tác 2% H2SO4 (13,27 g/L).
Từ khóa: Vật liệu nền carbon, sulfo hóa carbon, xúc tác acid rắn

Article Details

Tài liệu tham khảo

Hu, X., G.K. Chuah and S. Jaenicke, 2001. Room temperature synthesis of diphenylmethane over MCM-41 supported AlCl3 and other Lewis acids. Applied Catalysis A: General, 217(1–2): 1-9.

Hu, Y.-S., R. Demir-Cakan, M.-M. Titirici, J.-O. Müller, R. Schlögl, M. Antonietti and J. Maier, 2008. Superior storage performance of a Si@SiOx/C nanocomposite as anode material for lithium-ion batteries. Angewandte Chemie International Edition, 47(9): 1645-1649.

Kabyemela, B.M., T. Adschiri, R.M. Malaluan and K. Arai, 1999. Glucose and Fructose decomposition in subcritical and supercritical water: detailed reaction pathway, mechanisms, and kinetics. Industrial & Engineering Chemistry Research, 38(8): 2888-2895.

Liang, J., Y. Liu and J. Zhang, 2011. Effect of solution pH on the carbon microsphere synthesized by hydrothermal carbonization. Procedia Environmental Sciences, 11, Part C(0): 1322-1327.

Liang, X., H. Xiao, Y. Shen and C. Qi, 2010a. One-step synthesis of novel sulfuric acid groups' functionalized carbon via hydrothermal carbonization. Materials Letters, 64(8): 953-955.

Liang, X., M. Zeng and C. Qi, 2010b. One-step synthesis of carbon functionalized with sulfonic acid groups using hydrothermal carbonization. Carbon, 48(6): 1844-1848.

Makowski, P., R. Demir Cakan, M. Antonietti, F. Goettmann and M.-M. Titirici, 2008. Selective partial hydrogenation of hydroxy aromatic derivatives with palladium nanoparticles supported on hydrophilic carbon. Chemical Communications, 0(8): 999-1001.

Miller, G.L., 1959. Use of dinitrosalicylic acid reagent for determination of reducing sugar. Analytical Chemistry, 31(3): 426-428.

Mukesh Doble, A.K.K., 2007. Green chemistry & Engineering. 1st ed, The United States of America.

Sevilla, M. and A.B. Fuertes, 2009. The production of carbon materials by hydrothermal carbonization of cellulose. Carbon, 47(9): 2281-2289.

Valle-Vigón, P., M. Sevilla and A.B. Fuertes, 2012. Sulfonated mesoporous silica–carbon composites and their use as solid acid catalysts. Applied Surface Science, 261(0): 574-583.

Wang, Q., H. Li, L. Chen and X. Huang, 2001. Monodispersed hard carbon spherules with uniform nanopores. Carbon, 39(14): 2211-2214.

Watanabe, M., Y. Aizawa, T. Iida, T.M. Aida, C. Levy, K. Sue and H. Inomata, 2005. Glucose reactions with acid and base catalysts in hot compressed water at 473 oK. Carbohydrate Research, 340(12): 1925-1930.

Yamaguchi, D. and M. Hara, 2010. Starch saccharification by carbon-based solid acid catalyst. Solid State Sciences, 12(6): 1018-1023.

Zhang, B., J. Ren, X. Liu, Y. Guo, Y. Guo, G. Lu and Y. Wang, 2010. Novel sulfonated carbonaceous materials from p-toluenesulfonic acid/glucose as a high-performance solid-acid catalyst. Catalysis Communications, 11(7): 629-632.

Zhang, Z. and Z.K. Zhao, 2009. Solid acid and microwave-assisted hydrolysis of cellulose in ionic liquid. Carbohydrate Research, 344(15): 2069-2072.