The mechanism of pyridine hydrogenolysis on molybdenum-containing catalysts : II. Hydrogenation of pyridine to piperidine

J. Sonnemans; G.H. van den Berg; P. Mars

doi:10.1016/0021-9517(73)90329-1

The mechanism of pyridine hydrogenolysis on molybdenum-containing catalysts : II. Hydrogenation of pyridine to piperidine

J. Sonnemans, G.H. van den Berg, P. Mars

Faculty of Science and Technology

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Abstract

The kinetics of pyridine hydrogenation was studied at high hydrogen pressures on a Mo-Al oxide and a Co-Mo-Al oxide catalyst. The rate equation was found to be r = kPpyrPH2n/Ppyro, in which n is 1.5 at 300 and 375 °C and 1.0 at 250 °C. This rate equation can be derived assuming strong adsorption of pyridine and its products with identical adsorption constants. The (hydro)cracking of piperidine appears to have a low order in hydrogen, probably lower than 0.5. The adsorption behavior of nitrogen bases and hydrogen on alumina and the molybdenum-containing catalysts was investigated by the gas chromatographic method. The adsorption of the nitrogen bases appeared to be very strong on both catalysts, and varied in the order piperidine > pyridine > ammonia. Hydrogen also showed a strong adsorption. Hydrogen and nitrogen bases appeared to adsorb on different sites.

Original language	English
Pages (from-to)	220-230
Journal	Journal of catalysis
Volume	31
Issue number	2
DOIs	https://doi.org/10.1016/0021-9517(73)90329-1
Publication status	Published - 1973

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title = "The mechanism of pyridine hydrogenolysis on molybdenum-containing catalysts : II. Hydrogenation of pyridine to piperidine",

abstract = "The kinetics of pyridine hydrogenation was studied at high hydrogen pressures on a Mo-Al oxide and a Co-Mo-Al oxide catalyst. The rate equation was found to be r = kPpyrPH2n/Ppyro, in which n is 1.5 at 300 and 375 °C and 1.0 at 250 °C. This rate equation can be derived assuming strong adsorption of pyridine and its products with identical adsorption constants. The (hydro)cracking of piperidine appears to have a low order in hydrogen, probably lower than 0.5. The adsorption behavior of nitrogen bases and hydrogen on alumina and the molybdenum-containing catalysts was investigated by the gas chromatographic method. The adsorption of the nitrogen bases appeared to be very strong on both catalysts, and varied in the order piperidine > pyridine > ammonia. Hydrogen also showed a strong adsorption. Hydrogen and nitrogen bases appeared to adsorb on different sites.",

author = "J. Sonnemans and {van den Berg}, G.H. and P. Mars",

year = "1973",

doi = "10.1016/0021-9517(73)90329-1",

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pages = "220--230",

journal = "Journal of catalysis",

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T1 - The mechanism of pyridine hydrogenolysis on molybdenum-containing catalysts : II. Hydrogenation of pyridine to piperidine

AU - Sonnemans, J.

AU - van den Berg, G.H.

AU - Mars, P.

PY - 1973

Y1 - 1973

N2 - The kinetics of pyridine hydrogenation was studied at high hydrogen pressures on a Mo-Al oxide and a Co-Mo-Al oxide catalyst. The rate equation was found to be r = kPpyrPH2n/Ppyro, in which n is 1.5 at 300 and 375 °C and 1.0 at 250 °C. This rate equation can be derived assuming strong adsorption of pyridine and its products with identical adsorption constants. The (hydro)cracking of piperidine appears to have a low order in hydrogen, probably lower than 0.5. The adsorption behavior of nitrogen bases and hydrogen on alumina and the molybdenum-containing catalysts was investigated by the gas chromatographic method. The adsorption of the nitrogen bases appeared to be very strong on both catalysts, and varied in the order piperidine > pyridine > ammonia. Hydrogen also showed a strong adsorption. Hydrogen and nitrogen bases appeared to adsorb on different sites.

AB - The kinetics of pyridine hydrogenation was studied at high hydrogen pressures on a Mo-Al oxide and a Co-Mo-Al oxide catalyst. The rate equation was found to be r = kPpyrPH2n/Ppyro, in which n is 1.5 at 300 and 375 °C and 1.0 at 250 °C. This rate equation can be derived assuming strong adsorption of pyridine and its products with identical adsorption constants. The (hydro)cracking of piperidine appears to have a low order in hydrogen, probably lower than 0.5. The adsorption behavior of nitrogen bases and hydrogen on alumina and the molybdenum-containing catalysts was investigated by the gas chromatographic method. The adsorption of the nitrogen bases appeared to be very strong on both catalysts, and varied in the order piperidine > pyridine > ammonia. Hydrogen also showed a strong adsorption. Hydrogen and nitrogen bases appeared to adsorb on different sites.

U2 - 10.1016/0021-9517(73)90329-1

DO - 10.1016/0021-9517(73)90329-1

M3 - Article

SN - 0021-9517

VL - 31

SP - 220

EP - 230

JO - Journal of catalysis

JF - Journal of catalysis

IS - 2

ER -

The mechanism of pyridine hydrogenolysis on molybdenum-containing catalysts : II. Hydrogenation of pyridine to piperidine

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