Abo Bibliothek: Guest
Catalysis in Green Chemistry and Engineering

Erscheint 4 Ausgaben pro Jahr

ISSN Druckformat: 2572-9896

ISSN Online: 2572-990X

H-Index: 2

Indexed in

OPTIMIZATION OF REACTION PARAMETERS IN METHANOL-TO-OLEFINS REACTION THROUGH DESIGN OF EXPERIMENTS

Volumen 2, Ausgabe 2, 2019, pp. 155-170
DOI: 10.1615/CatalGreenChemEng.2020033435
Get accessGet access

ABSTRAKT

Methanol-to-olefins (MTO) reaction is important in establishing the use of fossil fuels, natural gas, and coal for production of petrochemicals. MTO reaction catalyzed by SAPO-34 was studied using design of experiments. Box-Behnken design was used for studying the effect of independent variables such as reaction temperature, methanol weight hourly space velocity (WHSV), and water content in feed and optimization. All independent variables show a significant effect on response variables such as catalyst life, % selectivity of olefins C2= and C3=, and C2=/C3= ratio. These observations were interpreted using main and interaction effect plots. Optimum temperature is around 450°C, at which catalyst life is high with moderate selectivity of C2= and C3=, and C2=/C3= ratio. At other temperatures, catalyst life is low. With an increase in temperature, selectivity of C2= and C3=, and C2=/C3= ratio increases. Water content was observed to play important role in enhancing catalyst life at higher reaction temperature. With an increase in WHSV, all response variables decreased. Regression was done for all response variables and statistically analyzed. Proposed correlations represent the experimental data adequately for all response variables. Optimum methanol WHSV, reaction temperature, and water in feed were observed to be 0.25 h-1, 468°C, and 18 wt%, respectively, to have maximum catalyst life and selectivity of olefins. Experimental results show that independent variables can be tuned to have the desired selectivity of olefins and C2=/C3= ratio.

REFERENZEN
  1. Baek, S., Lee, Y., and Jun, K., Effect of Water Addition on the Conversion of Dimethyl Ether to Light Olefins over SAPO-34, Korean Chem. Eng. Res., vol. 44, no. 4, pp. 345-349,2006.

  2. Box, G.E.P., Hunter, J.S., and Hunter, W.G., Statistics for Experimenters: Design, Discovery, and Innovation, New York: John Wiley and Sons, Inc., 2005.

  3. Castellanos-Beltran, I.J., Assima, G.P., and Lavoie, J., Effect of Temperature in the Conversion of Methanol to Olefins (MTO) Using an Extruded SAPO-34 Catalyst, Front. Chem. Sci. Eng., vol. 12, no. 2, pp. 226-238,2018.

  4. Chang, C.D. and Silvestri, A.J., The Conversion of Methanol and Other O-Compounds to Hydrocarbons over Zeolite Catalysts, J. Catal., vol. 47, pp. 249-259,1977.

  5. Chen, D., Moljord, K., and Holmen, A., A Methanol to Olefins Review: Diffusion, Coke Formation and Deactivation on SAPO Type Catalysts, Microporous Mesoporous Mater, vol. 164, no. 1, pp. 239-250,2012.

  6. Dahl, I.M. and Kolboe, S., On the Reaction Mechanism for Propene Formation in the MTO Reaction over SAPO-34, Catal. Lett., vol. 20, pp. 329-336,1993.

  7. Dahl, I.M. and Kolboe, S., On the Reaction Mechanism for Hydrocarbon Formation from Methanol over SAPO-34, J. Catal., vol. 149, no. 2, pp. 458-464. 1994.

  8. Dahl, I.M. and Kolboe, S., On the Reaction Mechanism for Propene Formation in the MTO Reaction over SAPO-34, Catal. Lett., vol. 161, no. 1,pp. 304-309,1996.

  9. Dai, W., Wu, G., Li, L., Guan, N., and Hunger, M., Mechanisms of the Deactivation of SAPO-34 Materials with Different Crystal Sizes Applied as MTO Catalysts, ACS Catal., vol. 3, no. 4, pp. 588-596,2013.

  10. Goetze, J., Meirer, F., Yarulina, I., Gascon, J., Kapteijn, F., Ruiz-Martinez, J., and Weckhuysen, B.M., Insights into the Activity and Deactivation of the Methanol-to-Olefins Process over Different Small-Pore Zeolites as Studied with Operando UV-vis Spectroscopy, ACS Catal., vol. 7, no. 6, pp. 4033-4046,2017.

  11. Guisnet, M., Costa, L., and Ribeiro, F.R., Prevention of Zeolite Deactivation by Coking, J. Mol. Catal. A, vol. 305, nos. 1-2, pp. 69-83, 2009.

  12. Keil, F.J., Hinderer, J., and Garayhi, A.R., Diffusion and Reaction in ZSM-5 and Composite Catalysts for the Methanol-to-Olefins Process, Microporous Mesoporous Mater., vol. 50, nos. 3-4, pp. 637-650,1999.

  13. Khare, R., Millar, D., and Bhan, A., A Mechanistic Basis for the Effects of Crystallite Size on Light Olefin Selectivity in Methanol-to-Hydrocarbons Conversion on MFI, J. Catal., vol. 321, pp. 23-31,2015.

  14. Mentzel, U.V., Hejholt, K.T., Holm, M.S., Fehrmann, R., and Beato, P., Conversion of Methanol to Hydrocarbons over Conventional and Mesoporous H-ZSM-5 and H-Ga-MFI: Major Differences in Deactivation Behavior, Appl. Catal. A: General, vols. 417-418, pp. 290-297,2012.

  15. Montgomery, D.C., Design and Analysis of Experiments, New York, NY: John Wiley & Sons Inc., 2009.

  16. Olsbye, U . , Svelle, S . , Bj0rgen,M . , Beato, P. , Janssens, T. V. W. , Joensen, F. , Bordiga, S . , andLillerud, K . P. , Conversion of Methanol to Hydrocarbons: How Zeolite Cavity and Pore Size Controls Product Selectivity, Angew. Chem. Int. Ed., vol. 51, no. 24, pp. 5810-5831,2012.

  17. Park, Y., Baek, S., and Ihm, S., Effect of Reaction Conditions and Catalytic Properties on Methanol Conversion over SAPO-34, J. Ind. Eng. Chem, vol. 7, no. 3, pp. 167-172,2001.

  18. Prakash, A.M. and Unnikrishnan, S., Synthesis of SAPO-34: High Silicon Incorporation in the Presence of Morpholine as Template, J. Chem. Soc. Faraday Transact., vol. 90, no. 15, pp. 2291-2296,1994.

  19. Spivey, J.J., Froment, G.F., Dehertog, W.J.H., and Marchi, A.J., Zeolite Catalysis in the Conversion of Methanol into Olefins, Catalysis, vol. 9, pp. 1-64,1992.

  20. Stocker, M., Methanol-to-Hydrocarbons: Catalytic Materials and Their Behavior, Micropor. Mesopor. Mater., vol. 29, nos. 1-2, pp. 3-48,1999.

  21. Sun, Q., Xie, Z., and Yu, J., The State-of-the-Art Synthetic Strategies for SAPO-34 Zeolite Catalysts in Methanol-to-Olefin Conversion, Natl. Sci. Rev, vol. 5, no. 4, pp. 542-558,2018.

  22. Tian, P., Wei, Y., Ye, M., and Liu, Z., Methanol to Olefins (MTO): From Fundamentals to Commercialization, ACS Catal., vol. 5, no. 3, pp. 1922-1938,2015.

  23. Wu, X. and Anthony, R.G., Effect of Feed Composition on Methanol Conversion to Light Olefins over SAPO-34, Appl. Catal. A: General, vol. 218, nos. 1-2, pp. 241-250,2001.

  24. Wu, X., Abraha, M.G., and Anthony, R.G., Methanol Conversion on SAPO-34: Reaction Condition for Fixed-Bed Reactor, Appl. Catal. A: General, vol. 260, no. 1, pp. 63-69,2004.

  25. Yarulina, I., Chowdhury, A.D., Meirer, F., Weckhuysen, B.M., and Gascon, J., Recent Trends and Fundamental Insights in the Methanol-to-HydrocarbonsProcess, Nat. Catal., vol. 398,no. 1,pp. 398-411,2018.

Digitales Portal Digitale Bibliothek eBooks Zeitschriften Referenzen und Berichte Forschungssammlungen Preise und Aborichtlinien Begell House Kontakt Language English 中文 Русский Português German French Spain