Hydrogenation of CO2 to Methanol over Copper-Zinc Oxide-Based Catalyst
Carbon dioxide is highly thermochemical stable molecules where it is very difficult to activate the molecule and achieve higher catalytic conversion into alcohols or other hydrocarbon compounds. In this paper, series of the bimetallic Cu/ZnO-based catalyst supported by SBA-15 were systematically prepared via impregnation technique with different Cu: Zn ratio for hydrogenation of CO2 to methanol. The synthesized catalysts were characterized by transmission electron microscopy (TEM), temperature programmed desorption, reduction, oxidation and pulse chemisorption (TPDRO), and surface area determination was also performed. All catalysts were tested with respect to the hydrogenation of CO2 to methanol in microactivity fixed-bed reactor at 250oC, 2.25 MPa, and H2/CO2 ratio of 3. The results demonstrate that the catalytic structure, activity, and methanol selectivity was strongly affected by the ratio between Cu: Zn, Where higher catalytic activity of 14 % and methanol selectivity of 92 % was obtained over Cu/ZnO-SBA-15 catalyst with Cu:Zn ratio of 7:3 wt. %. Comparing with the single catalyst, the synergetic between Cu and Zn provides additional active sites to adsorb more H2 and CO2 and accelerate the CO2 conversion, resulting in higher methanol production under mild reaction conditions.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1131752Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 623
 K. Srirangan, L. Akawi, M. Moo-Young, and C. P. Chou, "Towards sustainable production of clean energy carriers from biomass resources," Appl. Energy, vol. 100, Dec. 2012, pp. 172-186.
 J. Ma, N. Sun, X. Zhang, N. Zhao, F. Xiao, W. Wei, et al., "A short review of catalysis for CO2 conversion," Catal. Today, vol. 148, Nov. 2009, pp. 221-231.
 J. Toyir, P. R. de la Piscina, J. L. G. Fierro, and N. Homs, "Highly effective conversion of CO2 to methanol over supported and promoted copper-based catalysts: influence of support and promoter," Appl. Catal. B, vol. 29, Feb. 2001, pp. 207-215.
 G. A. Olah, "Beyond oil and gas: the methanol economy," Angew. Chem. Int. Ed., vol. 44, Mar. 2005, pp. 2636-2639.
 X. Guo, L. Li, S. Liu, G. Bao, And W. Hou, "Preparation of CuO/ZnO/Al2O3 catalysts for methanol synthesis using parallel-slurry-mixing method," J. of Fuel Chemistry and Technology, vol. 35, Dec. 2007, pp. 329-333.
 X.-L. Liang, X. Dong, G.-D. Lin, and H.-B. Zhang, "Carbon nanotube-supported Pd–ZnO catalyst for hydrogenation of CO2 to methanol," Appl. Catal. B, vol. 88, May. 2009, pp. 315-322.
 L. Wang, L. Yang, Y. Zhang, W. Ding, S. Chen, W. Fang, "Promoting effect of an aluminum emulsion on catalytic performance of Cu-based catalysts for methanol synthesis from syngas," Fuel Process. Technol., vol. 91, Jan. 2010, pp. 723-728.
 T. Fujitani and J. Nakamura, "The effect of ZnO in methanol synthesis catalysts on Cu dispersion and the specific activity," Catal. Lett., vol. 56, Oct. 1998, pp. 119-124.
 Y. Kanai, T. Watanabe, T. Fujitani, T. Uchijima, and J. Nakamura, "The synergy between Cu and ZnO in methanol synthesis catalysts," Catal. Lett., vol. 38, Jan. 1996, pp. 157-163.
 M. Behrens, F. Studt, I. Kasatkin, S. Kühl, M. Hävecker, and F. Abild-Pedersen, "The active site of methanol synthesis over Cu/ZnO/Al2O3 industrial catalysts," Science, vol. 336, May 2012, pp. 893-897.
 Y. Tanaka, C. Kawamura, A. Ueno, Y. Kotera, K. Takeuchi, and Y. Sugi, "A novel catalyst for methanol synthesis," Appl. Catal., vol. 8, Dec. 1983, pp. 325-333.
 M. Kurtz, N. Bauer, C. Büscher, H. Wilmer, O. Hinrichsen, and R. Becker, "New synthetic routes to more active Cu/ZnO catalysts used for methanol synthesis," Catal. Lett., vol. 92, Jan. 2004, pp. 49-52.
 R. Burch and R. J. Chappell, "Support and additive effects in the synthesis of methanol over copper catalysts," Appl. Catal., vol. 45, Jan. 1988, pp. 131-150.
 S. Natesakhawat, J. W. Lekse, J. P. Baltrus, P. R. Ohodnicki Jr, B. H. Howard, and X. Deng, "Active sites and structure–activity relationships of copper-based catalysts for carbon dioxide hydrogenation to methanol," ACS Catal., vol. 2, June 2012, pp. 1667-1676.