Observation on inhibition of Ti3+ reduction by fumed silica addition in Ziegler-Natta catalyst with in situ ESR

Jirawat Pinyocheep; Sirachaya Kunjara Na Ayudhya; Bunjerd Jongsomjit; Piyasan Praserthdam

Journal of Industrial and Engineering Chemistry, Vol.18, No.6, 1888-1892, November, 2012

DOI10.1016/j.jiec.2012.04.018 Export Citation

Observation on inhibition of Ti3+ reduction by fumed silica addition in Ziegler-Natta catalyst with in situ ESR

Jirawat Pinyocheep, Sirachaya Kunjara Na Ayudhya¹, Bunjerd Jongsomjit^†, and Piyasan Praserthdam

Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand
¹SCG Chemicals Co., Ltd., Bangkok 10800, Thailand

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This study focused on elucidation of effect of fumed silica added in the commercial Ziegler-Natta catalysts by physical solid-solid stirring. The added fumed silica seemed to cover around the catalyst revealed by SEM-EDX and apparently resulted in decreased activity of ethylene polymerization, but increased molecular weight of polyethylene as measured by GPC. Based on the in situ ESR measurement, it can be concluded that fumed silica can inhibit the reduction of Ti3+ by triethylaluminum (TEA). It is suggested that the delay reduction of Ti3+ may be beneficial for propylene polymerization.

Keywords:Ziegler-Natta;Polyethylene;Fumed silica;Molecular weight;Oxidation state

[References]

Bohm LL, Angewandte Chemie International Edition., 42, 5010 (2003)
Senso N, Jongsomjit B, Praserthdam P, Molecules., 16, 1323 (2011)
Pullukat TJ, Hoff RE, Catal. Rev.-Sci. Eng., 41(3-4), 389 (1999)
Vakili M, Arabi H, Mobarakeh HS, Ghafelebashi M, J. Appl. Polym. Sci., 118(4), 2216 (2010)
Apecetche MA, Cao PA, Awe MD, Schoeb-Wolters AM, Impelman RW, US 0265402 A1 (2007)
Garoff T, Vaananen M, Root A, Stalhammar M, Pesonen K, European Polymer Journal., 43, 5055 (2007)
Luo HK, Tang RG, Gao KJ, J. Catal., 210(2), 328 (2002)
Haukka S, Lakomaa E, Root A, Journal of Physical Chemistry., 97, 5085 (1993)
Haukka S, Lakomaa EL, Jylha O, Vilhunen J, Hornytzkyj S, Langmuir, 9(12), 3497 (1993)
Schrijnemakers K, Van Der Voort P, Vansant EF, Physical Chemistry Chemical Physics., 1, 2569 (1999)
Van Grieken E, Carrero A, Suarez I, Paredes B, European Polymer Journal., 43, 1267 (2007)
Panchenko VN, Pozimenko VA, Paukshtis EA, Zakharov VA, Russian Journal of Inorganic Chemistry., 54, 1798 (2009)
Tangjituabun K, Jongsomjit B, Praserthdam P, Catal. Lett., 109(3-4), 147 (2006)
Brant P, Speca AN, Macromolecules., 20, 2740 (1987)
Poluboyarov VA, Anufrienko VF, Zakharov VA, Sergeev SA, Makhtarulin SI, Bukatov GD, Reaction Kinetics and Catalysis Letters., 26, 347 (1984)
Chu K, Chang H, Ihm S, European Polymer Journal., 30, 1467 (1994)
Ludlum DB, Anderson AW, Ashby CE, Journal of the American Chemical Society., 80, 1380 (1957)
Zucchini U, Cecchin G, Advances in Polymer Science., 51, 101 (1983)
Kashiwa N, Yoshitake J, Macromolecular Chemistry and Physics., 85, 1133 (1984)
Soga K, Terano M, Polymer Bulletin., 4, 39 (1981)

[Referenced By]

[1] Bohm LL, Angewandte Chemie International Edition., 42, 5010 (2003)

[2] Senso N, Jongsomjit B, Praserthdam P, Molecules., 16, 1323 (2011)

[3] Pullukat TJ, Hoff RE, Catal. Rev.-Sci. Eng., 41(3-4), 389 (1999)

[4] Vakili M, Arabi H, Mobarakeh HS, Ghafelebashi M, J. Appl. Polym. Sci., 118(4), 2216 (2010)

[5] Apecetche MA, Cao PA, Awe MD, Schoeb-Wolters AM, Impelman RW, US 0265402 A1 (2007)

[6] Garoff T, Vaananen M, Root A, Stalhammar M, Pesonen K, European Polymer Journal., 43, 5055 (2007)

[7] Luo HK, Tang RG, Gao KJ, J. Catal., 210(2), 328 (2002)

[8] Haukka S, Lakomaa E, Root A, Journal of Physical Chemistry., 97, 5085 (1993)

[9] Haukka S, Lakomaa EL, Jylha O, Vilhunen J, Hornytzkyj S, Langmuir, 9(12), 3497 (1993)

[10] Schrijnemakers K, Van Der Voort P, Vansant EF, Physical Chemistry Chemical Physics., 1, 2569 (1999)

[11] Van Grieken E, Carrero A, Suarez I, Paredes B, European Polymer Journal., 43, 1267 (2007)

[12] Panchenko VN, Pozimenko VA, Paukshtis EA, Zakharov VA, Russian Journal of Inorganic Chemistry., 54, 1798 (2009)

[13] Tangjituabun K, Jongsomjit B, Praserthdam P, Catal. Lett., 109(3-4), 147 (2006)

[14] Brant P, Speca AN, Macromolecules., 20, 2740 (1987)

[15] Poluboyarov VA, Anufrienko VF, Zakharov VA, Sergeev SA, Makhtarulin SI, Bukatov GD, Reaction Kinetics and Catalysis Letters., 26, 347 (1984)

[16] Chu K, Chang H, Ihm S, European Polymer Journal., 30, 1467 (1994)

[17] Ludlum DB, Anderson AW, Ashby CE, Journal of the American Chemical Society., 80, 1380 (1957)

[18] Zucchini U, Cecchin G, Advances in Polymer Science., 51, 101 (1983)

[19] Kashiwa N, Yoshitake J, Macromolecular Chemistry and Physics., 85, 1133 (1984)

[20] Soga K, Terano M, Polymer Bulletin., 4, 39 (1981)