A porous medium involving endothermic chemical reaction was studied by using the irreversible flow processes thermodynamics methodA mathematical model describing the coupled irreversible processes of heat transfer

mass transfer and chemical reaction in porous medium was established

and the model was solved numerically by applying the finite volume implicit methodBy taking the decomposition of limestone as a case

the effects of the Soret and the Dufour phenomena were analyzedThe results showed that when the Peclet module was lower

the effects of the Soret and the Dufour phenomena could not be ignoredAs a result

the product gas and the quantity of heat of gas in the porous medium would come through the reactor much quicker

and the concentration of the product gas

the temperature of gas flow and the solid conversion degree would be lower.