TY - JOUR

T1 - Self-sustained Oscillations in Oxidation of Propane Over Nickel

T2 - Experimental Study and Mathematical Modelling

AU - Lashina, E. A.

AU - Kaichev, V. V.

AU - Saraev, A. A.

AU - Chumakova, N. A.

AU - Chumakov, G. A.

AU - Bukhtiyarov, V. I.

PY - 2020/3/1

Y1 - 2020/3/1

N2 - The regular reaction rate oscillations were observed by mass-spectrometry in the oxidation of propane over the Ni foil. CO, CO2, H2, and H2O were detected as products. The oscillations of products and reactants in the gas phase were accompanied by the oscillations of the catalyst temperature. It was shown by using isotopic labeling 18O2 that CO and CO2 formed simultaneously by the propane oxidation when the catalyst was in the highly active state. The non-isothermal model of a continuous stirred-tank reactor based on a microkinetic scheme including 50 reaction steps was developed. The model takes into account periodic oxidation and reduction of nickel and formation of main products. Using the method of quasi-steady-state approximations, it was shown that the observed self-sustained oscillations are associated with periodic changes in the coverage of the Ni surface by adsorbed oxygen and carbon as well as nickel oxide species. It was shown that the microkinetic scheme coupled with a continuous stirred-tank reactor model qualitatively describes the experimental data if the model also considers the periodic processes of oxidation and reduction of the Ni bulk.

AB - The regular reaction rate oscillations were observed by mass-spectrometry in the oxidation of propane over the Ni foil. CO, CO2, H2, and H2O were detected as products. The oscillations of products and reactants in the gas phase were accompanied by the oscillations of the catalyst temperature. It was shown by using isotopic labeling 18O2 that CO and CO2 formed simultaneously by the propane oxidation when the catalyst was in the highly active state. The non-isothermal model of a continuous stirred-tank reactor based on a microkinetic scheme including 50 reaction steps was developed. The model takes into account periodic oxidation and reduction of nickel and formation of main products. Using the method of quasi-steady-state approximations, it was shown that the observed self-sustained oscillations are associated with periodic changes in the coverage of the Ni surface by adsorbed oxygen and carbon as well as nickel oxide species. It was shown that the microkinetic scheme coupled with a continuous stirred-tank reactor model qualitatively describes the experimental data if the model also considers the periodic processes of oxidation and reduction of the Ni bulk.

KW - Heterogeneous catalysis

KW - Mathematical modelling

KW - Nickel

KW - Propane oxidation

KW - Quasi-steady-state approximations

KW - Self-sustained oscillations

KW - UBI-QEP METHOD

KW - KINETIC OSCILLATIONS

KW - BEHAVIOR

KW - METHANE OXIDATION

KW - CO OXIDATION

KW - TRANSITION

KW - OXYGEN

KW - CATALYTIC-OXIDATION

KW - SURFACE

KW - ALKANES

UR - http://www.scopus.com/inward/record.url?scp=85079146397&partnerID=8YFLogxK

U2 - 10.1007/s11244-019-01219-5

DO - 10.1007/s11244-019-01219-5

M3 - Article

AN - SCOPUS:85079146397

VL - 63

SP - 33

EP - 48

JO - Topics in Catalysis

JF - Topics in Catalysis

SN - 1022-5528

IS - 1-2

ER -