Effect of Chromium Loading on Diatomite for the Synthesis of Dimethyl Ether from Methanol

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Medta Boupan
Witsuta Nuttharungsri
Ekkalak Netmanee
Tinnakorn Kumsaen
Arthit Neramittagapong
Sutasinee Neramittagapong

Abstract

This research investigates the results of catalytic methanol dehydration for synthesis of dimethyl ether using chromium on diatomite catalyst with different the metal loading. The reactions were performed in pack-bed reactor at temperature between 250 to 350°C. According to the experimental results, the conversion of methanol increased with the increase of chromium loading on diatomite catalyst. DME selectivity was up to 99 percent. The surface acidity increased due to chromium loading, whereas the surface areas decreased. It was found that metal oxide loading and surface acidity affected reaction rates more than the surface area of the catalyst. Finally, 15%Cr/DM catalyst give high methanol conversion at 91.7 percent and it has exhibited good stability during the 12 hour experiment. The catalyst has shown efficient synthesis of dimethyl ether from methanol.

Article Details

Section
Engineering Research Articles

References

[1] A. A. Rownaghi, F. Rezaei, M. Stante, and J. Hedlund, “Selective dehydration of methanol to dimethyl ether on ZSM-5 nanocrystal,” Applied Catalysis B: Environmental, vol. 119–120, pp. 56–61, 2012.

[2] F. Yaripoura, F. Baghaeia, I. Schmidtb, and J. Perregaardb, “Catalytic dehydration of methanol to dimethyl ether (DME) over solid-acid catalysts,” Catalysis Communications, vol. 6, no. 2, pp. 147–152, 2005.

[3] S.-M. Kim, Y.-J. Lee, J. W. Bae, H. S. Potdar, and K.-W. Jun, “Synthesis and characterization of a highly active alumina catalyst for methanol dehydration to dimethyl ether,” Applied Catalysis A: General, vol. 348, no. 1, pp. 113–120, 2008.

[4] Z. Hosseini, M. Taghizadeh, and F. Yaripour, “Synthesis of nanocrystalline γ-Al2O3 by sol-gel and precipitation methods for methanol dehydration to dimethyl ether,” Journal of Natural Gas Chemistry, vol. 20, no. 2, pp. 128–134, 2011.

[5] C. Aphiruk and K. Rangsriwatananon, “Effects of thermal and acid treatments on some physicochemical properties of Lampang diatomite,” Suranaree Journal of Science and Technology, vol. 11, pp. 289–299, 2004.

[6] W. Pranee, “Synthesis of dimethyl ether as an alternative fuel,” Ph.D. dissertation, Department of Chemical Engineering, Khon Kaen University, Khon Kaen, 2015.

[7] O. Şan, R. Gören, and C. Özgür, “Purification of diatomite powder by acid leaching for use in fabrication of porous ceramics,” International Journal of Mineral Processing, vol. 93, no. 1, pp. 6–10, 2009.

[8] H. A. Alyosefa, S. Ibrahimb, J. Welscherc, A. Inayatc, A. Eilertd, R. Denecked, W. Schwiegerc, T. Münstere, G. Kloesse, W.-D. Einickea, and D. Enkea, “Effect of acid treatment on the chemical composition and the structure of Egyptian diatomite,” International Journal of Mineral Processing, vol. 132, pp. 17–25, 2014.

[9] J.-H. Kima, H.-M. Jeonga, C. W. Naa, J.-W. Yoona, F. Abdel-Hadyb, A.A. Wazzanb, and J.-H. Lee, “Highly selective and sensitive xylene sensors using Cr2O3-ZnCr2O4 hetero-nanostructures prepared by galvanic replacement,” Sensors and Actuators B: Chemical, vol. 235, pp. 498–506, 2016.

[10] Y.-X. Cheng, J.-L. Fan, Z.-Y. Xie, Ji-Q. Lu, and M.-F. Luo, “Effects of M-promoter (M = Y, Co, La, Zn) on Cr2O3 catalysts for fluorination of perchloroethylene,” Fluorine Chemistry, vol. 156, pp. 66–72 , 2013.

[11] L. Zhang, J. Wang, P. Wu, Z. Hou, J. Feı, and X. Zheng, “Synthesis of dimethyl ether via methanol dehydration over combined Al2O3-HZSM-5 solid acids,” Chinese Journal of Catalysis, vol. 31, no. 8, pp. 987–992, 2010.

[12] K. C. Tokaya,T. Dogua, and G. Dogub, “Dimethyl ether synthesis over alumina based catalysts,” Chemical Engineering Journal, vol. 184, pp. 278–285, 2012.

[13] W. Pranee, P. Assawasaengrat, A. Neramittagapong, S. Intarachit, and S. Neramittagapong, “Dimethyl ether synthesis via methanol dehydration over bea zeolite from bagasse fly ash with Zircronium- and Nickel-Ion exchange,” Advanced Materials Research, vol. 931–932, pp. 3–6, 2014.