The influence of the topology and acidity of zeolites on the hydrogenation reaction of 1,2,4-trimethylbenzene
The hydrogenation of 1,2,4-trimethylbenzene (1,2,4-TMB) was carried out over the zeolite catalysts of HZSM-5,HCOK-5, HBeta and HMCM-49 and bifunctional catalysts 2 %Ni/zeolite, which were prepared by incipient wetness impregnation. High catalytic performance was obtained on COK-5 zeolite under testing conditions. The conversion of 1,2,4-TMB rose from 59.4 % over HCOK-5 to 70.2 % over 2 %Ni/HCOK-5, so did the selectivity to BTX 37.6 % over HCOK-5 to 55.8 % over 2 %Ni/HCOK-5. In order to correlate their catalytic performances with their physicochemical properties, the catalysts were characterized by the joint use of various physicochemical characterization methods, such as XRD, TPD and TPR. The results showed that the excellent properties of both catalysts may be mainly assigned to the presence of a number of weakly acidic and intercrossing channels of 12MR + 10MR of HCOK-5. Improvement of the catalytic properties of 2 %Ni/HCOK-5 was related to the reduction of the nickel species bounded with the active zeolite Al-framework.
KeywordsHydrogenation of 1,2,4-trimethylbenzene Ni Zeolite Topology Acidity
This work was supported by the Foundation of Education Committee of Heilongjiang (Grant No.12531141).
- 7.Weitkamp J, Raichle A, Traa Y et al (2000) Chem Commun 1133–1134Google Scholar
- 8.Gorra F, Breckenridge LL, Guy WM, Sailor RA (1992) Oil Gas J 12:60Google Scholar
- 9.D’auria JH, Stoodt TJ (1997) Hart’s Fuel Technol Manag. 35Google Scholar
- 10.Tsai TC, Huang DS, Lin CM, Chiu CT, Kao JW, Ku CS, Tsai KY, Beech J, Kinn T, Mizrahi S, Rouleau N, Sapre A, Wang HJ (1997) 2nd Joint China/US Chemical Engineering Conference, Beijing, 19–22 May 1997Google Scholar
- 11.Farnos L (1997) BTX Intermediates and Derivatives Conference, Singapore, 19–20 June 1997Google Scholar
- 19.Bennett JM, Chang CD, Lawton SL, et al (1993) US 5236575Google Scholar
- 20.Treacy MMJ (2001) XRD powder patterns for zeolites, 4th edn. Elsevier, AmsterdamGoogle Scholar
- 26.Lensveld DJ, Gerbrand Mesu J, Van Dillen AJ et al (2001) Microporous Mesopor. Mater. 401:44–45Google Scholar