Effect of Si/Al ratio on performance of Pt.Sn-based catalyst supported on ZSM-5 zeolite for n-butane conversion to light olefins

Zeeshan Nawaz; Shu Qing; Gao Jixian; Xiaoping Tang; Fei Wei

Journal of Industrial and Engineering Chemistry, Vol.16, No.1, 57-62, January, 2010

DOI10.1016/j.jiec.2010.01.021 Export Citation

Effect of Si/Al ratio on performance of Pt.Sn-based catalyst supported on ZSM-5 zeolite for n-butane conversion to light olefins

Zeeshan Nawaz^†, Shu Qing, Gao Jixian, Xiaoping Tang, and Fei Wei

Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology (FLOTU), Department of Chemical Engineering, Tsinghua University, Beijing 100084, PR China

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The performance of Pt-Sn-based catalyst, supported on ZSM-5 of different Si/Al ratios were investigated for simultaneous dehydrogenation and cracking of n-butane to produce light olefins. The catalysts were characterized by number of physio-chemical techniques including XRF, TEM, IR spectra, NH3-TPD and O2-pulse analysis. Increase in Si/Al ratio of zeolite support ZSM-5 significantly increased light olefin’s selectivity, while feed conversion decreases due to lower acidity of support. The results indicated that both the n-butane cracking and dehydrogenation activity to light olefin’s over Pt-Sn/ZSM-5 samples with increasing Si/Al ratios greatly enhanced catalytic performance. The catalysts were deactivated with time-on-stream due to the formation of carbon-containing deposits. A coke deposition was significantly related to catalyst activity, while at higher Si/Al ratio catalyst the coke precursors were depressed. These results suggested that the Pt-Sn/ZSM-5 catalyst of Si/Al ratio 300 is superior in achieving high total olefins selectivity (above 90 wt.%). The Pt-Sn/ZSM-5 also demonstrates resistance towards hydrothermal treatment, as analyzed through the three successive reaction-regeneration cycles.

Keywords:n-butane;Propylene;Selectivity;Cracking;Si/Al ratio;Dehydrogenation;Total olefins

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[Referenced By]

[1] Lu J, Zhao Z, Xu C, Duan A, Zhang P, Catal. Lett., 109, 203 (2006)

[2] Corma A, Melo FV, Sauvanaud L, Ortega F, Catal. Today, 107-108, 699 (2005)

[3] Nawaz Z, Xiaoping T, Fei W, Korean J. Chem. Eng., 26(6), 1528 (2009)

[4] Fei W, Xiaoping T, Huaqun Z, Zeeshan N, Petrochem. Technol., 37, 979 (2008)

[5] Lu J, Zhao Z, Xu C, Zhang P, Duan A, Catal. Commun., 7, 199 (2006)

[6] Alfons B, Buekens G, Froment GF, Ind. Eng. Chem. Process. Des. Dev., 10, 309 (1971)

[7] Sundaram KM, Froment GF, Ind. Eng. Chem. Fund., 17, 174 (1978)

[8] Lu JY, Zhao Z, Xu CM, Zhang P, Petrol. Sci., 1, 52 (2005)

[9] Ji D, Wang B, Qian G, Gao Q, Lu G, Yan L, Suo JS, Catal. Commun., 6, 297 (2005)

[10] Zhao GL, Teng JW, Jin WQ, Yang WM, Xie ZK, Chen QL, China J. Catal., 24, 119 (2003)

[11] Weitkamp J, Traa Y, Catal. Today, 49(1-3), 193 (1999)

[12] Corma A, Chem. Rev., 95(3), 559 (1995)

[13] Chen NY, Garwood WE, Catal. Rev. Sci. Eng., 28, 185 (1986)

[14] Gabriele M, Johannes AL, J. Catal., 139, 24 (1993)

[15] Yilmaz B, Muller U, Top. Catal., 52, 888 (2009)

[16] Meshram NR, Hegde SG, Kulkarni SB, Zeolites, 6, 434 (1986)

[17] Bocanegra SA, Guerrero-Ruiz A, de Miguel SR, Scelza OA, Appl. Catal. A: Gen., 277(1-2), 11 (2004)

[18] Yiwei Z, Zhou Y, Qiu A, Wang Y, Xu Y, Wu P, Catal. Commun., 7, 860 (2006)

[19] Nawaz Z, Shu Q, Naveed S, Wei F, Bull. Chem. Soc. Ethiop., 23, 429 (2009)

[20] Yiwei Z, Zhou Y, Qiu A, Wang Y, Xu Y, Wu P, Acta Phys. Chim. Sin., 22, 6 (2006)

[21] Kumar MS, Chen D, Holmen A, Walmsley JC, Catal. Today, 142, 17 (2009)

[22] Nawaz Z, Zhu J, Wei F, Proceed. 6th IBCAST 2009, Islamabad. (in press)

[23] Airaksinen SMK, Krause AOI, Ind. Eng. Chem. Res., 44(11), 3862 (2005)

[24] Serge R, Thermal and Catalytic, Processes in Petroleum Refining, Taylor & Francis Group, LLC, New York, 2003, p. 14.

[25] Treesukol P, Srisuk K, Limtrakul J, Truong TN, J. Phys. Chem. B, 109(24), 11940 (2005)