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A review on mechanistic kinetic models of ethanol steam reforming for hydrogen production using a fixed bed reactor

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Abstract

Hydrogen is considered as the main energy genesis of the future. Many applications have been considered for the use of hydrogen as an energy source, especially in the polymer electrolyte membrane fuel cell (PEMFC). Ethanol steam reforming (ESR) is considered to be the most viable technology, because ethanol can be produced from a bio-refinery which can be easily distributed and controlled. The kinetics of ESR have been studied based on different noble metals as well as non-noble metals using supporters in the form of metal oxides, mixed metal oxides, spinel, pervoskite, hydrotalcite, etc. The Eley–Rideal (ER) mechanism and the Langamuir–Hinshelwood–Hougen–Watson (LHHW) mechanism have been used to express the kinetics of ESR. Different catalysts will follow different types of kinetics depending on the reaction path and the kind of model preferred for the development of the kinetics. LHHW mechanism is preferred over the ER mechanism due to its accuracy and the highest activation energy associated with it. This study reviews the generalized mechanistic kinetics for the ESR using fixed bed reactor to produce hydrogen.

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Abbreviations

AAD:

Average absolute deviation

ER:

Eley–Rideal

ESR:

Ethanol steam reforming

LHHW:

Langmuir–Hinshelwood–Hougen–Watson

RDS:

Rate determining step

WGS:

Water gas shift

\(\Delta H\) :

Heat of adsorption

\(C\) :

Concentration of reaction species

\(C_{\text{T}}\) :

Concentration of active sites

\(E_{\text{a}}\) :

Activation energy

\(F\) :

Molar flow rate

\(k\) :

Kinetic rate constant

\(K\) :

Adsorption constant for species or Equilibrium constant of reaction

\(P\) :

Partial pressure of reaction species

\(R\) :

Universal gas constant

\(r\) :

Rate of reaction

T :

Temperature

W :

Weight of the catalyst

X :

Conversion

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Acknowledgements

The authors would like to thank Prof. Santosh Kumar Gupta of our department for his inspiring guidance.

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Correspondence to Kumargaurao D. Punase.

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Punase, K.D., Rao, N. & Vijay, P. A review on mechanistic kinetic models of ethanol steam reforming for hydrogen production using a fixed bed reactor. Chem. Pap. 73, 1027–1042 (2019). https://doi.org/10.1007/s11696-018-00678-6

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  • DOI: https://doi.org/10.1007/s11696-018-00678-6

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