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Coking and regeneration of palladium-doped H3PW12O40/SiO2 catalysts

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Abstract

The coking during propene oligomerisation and subsequent regeneration of both silica-supported heteropoly acid H3PW12O40 (PW) and its palladium-modified form (1.6–2.5 wt% Pd) have been studied. 31P MAS NMR studies have revealed that the Keggin structure of the catalyst was unaffected by coke deposition in both unmodified PW/SiO2 and Pd-modified form. As shown by 13C MAS NMR and TGA/TPO, the Pd modification affects the nature of the coke formed: for the standard catalyst (PW/SiO2) both soft coke, comprising mainly high molecular weight aliphatic oligomers, and hard coke, comprising polynuclear aromatics, are formed whilst on the Pd-modified catalyst only the soft coke is observed. Coke formation causes strong deactivation of the catalyst in the oligomerisation of propene. The aerobic burning of coke on the unmodified PW/SiO2 occurs in the temperature range of 470–520°C. Doping the catalyst with Pd significantly decreases this temperature to allow catalyst regeneration at temperatures as low as 350°C without loss of catalytic activity.

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Authors and Affiliations

  1. Leverhulme Centre for Innovative Catalysis, Department of Chemistry, The University of Liverpool, Liverpool, L69 3BX, UK

    M.R.H. Siddiqui, S. Holmes, H. He & I.V. Kozhevnikov

  2. BP Chemicals Ltd., Poplar House, Chertsey Road, Sunbury-on-Thames, Middlesex, TW16 7LL, UK

    W. Smith, E.N. Coker & M.P. Atkins

Authors
  1. M.R.H. Siddiqui
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  2. S. Holmes
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  3. H. He
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  4. W. Smith
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  5. E.N. Coker
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  6. M.P. Atkins
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  7. I.V. Kozhevnikov
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Siddiqui, M., Holmes, S., He, H. et al. Coking and regeneration of palladium-doped H3PW12O40/SiO2 catalysts. Catalysis Letters 66, 53–57 (2000). https://doi.org/10.1023/A:1019083103395

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