Influence of Fe or Zn Loading Method on Toluene Methylation over MFI-Type Zeolite Catalysts

Suphot Phatanasri; Piyasan Praserthdam; Thana Punsupsawat

Korean Journal of Chemical Engineering, Vol.17, No.4, 414-419, July, 2000

DOI10.1007/BF02706852 Export Citation

Influence of Fe or Zn Loading Method on Toluene Methylation over MFI-Type Zeolite Catalysts

Suphot Phatanasri^†, Piyasan Praserthdam, and Thana Punsupsawat

Petrochemical Engineering Laboratory, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

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Toluene methylation with methanol was investigated on MFI-type zeolite catalysts containing Fe or Zn within the range of 0-2% by weight as an active component. The catalytic performances were compared on catalysts to which Fe or Zn was introduced by different methods, i.e., ion-exchanged and incorporation methods. The prepared catalysts were characterized by XRD, XRF, BET, FTIR and pyridine adsorption technique on in-situ FTIR. The results showed that the incorporated samples, H-Fe, Al-silicate (Si/Fe=150) and H-Zn, Al-silicate (Si/Zn=150), exhibited catalytic activity and xylene selectivities approximately equivalent to those from the ion-exchanged samples, Fe(0.8)/H-MFI and Zn(1.0)/H-MFI, containing nearly the same amount of Fe or Zn. The higher p-xylene selectivity was achieved with H-Fe, Al-silicate (Si/Fe=150) and H-Zn, Al-silicate (Si/Zn=150) because of Bronsted acid strengths weaker than Fe(0.8)/H-MFI and Zn(1.0)/H-MFI. Therefore, the isomerization of p-isomer produced primarily was suppressed on the incorporated catalysts better than the ion-exchanged ones.

Keywords:Ion-Exchange Method;Incorporation Method;Modified MFI Zeolites;Toluene Methylation;Characterization

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[4] Inui T, ACS. Symp., 480 (1989)

[5] Kaeding WW, J. Catal., 95, 512 (1985)

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[7] Kaeding WW, Chu C, Young LB, J. Catal., 89, 267 (1984)

[8] Karge HG, Microporous Mater., 22, 547 (1998)

[9] Olson DH, Haag WO, ACS. Symp., 248, 275 (1984)

[10] Paparatto G, de Alberti G, Leofanti G, Padovan M, Stud. Surf. Sci. Catal., 41, 225 (1989)

[11] Inui T, Nagata H, Okazumi F, Matsuda H, Catal. Lett., 13, 297 (1992)

[12] Parikh PA, Subamanyum N, Bhat YS, Halgeri AB, Catal. Lett., 14, 107 (1992)

[13] Sotelo JL, Uguina MA, Valverde JL, Serrano DP, J. Ind. Eng. Chem. Prod. Res., 32, 2548 (1993)

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[15] Weikamp, J. Ind. Eng. Chem. Prod. Res., 21, 550 (1982)

[16] Yashima T, Sakaguchi Y, Namba S, Stud. Surf. Sci. Catal., 7, 739 (1981)