Steam gasification of a cellulose surrogate over a fluidizable Ni/α‐alumina catalyst: A kinetic model

Abstract

Catalytic steam gasification of a cellulose surrogate using a fluidizable Ni/α‐alumina catalyst is presented. Experiments were carried out in the CREC fluidized riser simulator. On this basis, a reaction network and a kinetic model for biomass catalytic steam gasification were proposed. This kinetic model was developed using a sound reaction engineering approach where reaction rates for various species are the result of the algebraic addition of dominant reactions. The modeling procedure also included the decoupled determination of intrinsic kinetic parameters and adsorption constants as allowed in the CREC riser simulator. The implemented approach eliminates overparametrization with successfully parameter correlation. Numerical regression of the experimental data led to intrinsic kinetic parameters with narrow spans showing that the proposed kinetic model satisfactorily describe the catalytic conversion of glucose under the selected gasification conditions. © 2011 American Institute of Chemical Engineers AIChE J, 2012

Kinetic Model of Catalytic Steam Gasification of 2-Methoxy-4-methylphenol Using 5% Ni–0.25% Ru/γAl2O3 in a CREC-Riser Simulator

“…8 and compared with values obtained in previous studies by our research team (17,18), using glucose and 2-methoxy-4-methylphenol and 20% Ni/5% La 2 O 3 -γAl 2 O 3 and 2.5% Ni-αAl 2 O 3 catalysts. [2,19]. Regarding the magnitude of the activation energy for the water-gas shift, a value of 20.21 kJ/mol was estimated in the present study, which is within the range of the activation energies reported in the literature (17.5-26.6 kJ/mol) [20,21].…”

“…• SRM for steam methane reforming reaction with values larger than those reported by Mazumder et al [18] and significantly bigger than those from Salaices et al [19]. On the other hand, the activation energy value of 63.9 kJ/mol s obtained which is close to the range reported in the literature (70-141 kJ/mol) [21][22][23][24][25][26].…”

“…In summary, while the activation energies for both water gas shift and methane reforming are in the range reported in the literature [18,19], the catalyst of the present study displays a larger energy of activation for methane reforming versus the water gas shift reaction, favoring CO and H 2 selectivities at higher temperatures of 650 • C.…”

Catalytic Steam Gasification of Biomass: Catalysts, Thermodynamics and Kinetics

“…Salaices et al were the first ones to overcome this dilemma by demonstrating the viability of establishing, as is demonstrated in the upcoming sections, kinetic models using a sound reaction engineering approach. Reaction rates for various species were expressed as the algebraic addition (“additive effect”) of the dominant reactions as follows: r i = normalν W G S , i r W G S , r normalν W G S , r + normalν S R , i r S R , r normalν S R , r + normalν D R M , i r D R , r normalν D R , r where r W G S , H 2 = k W G S ACS:no-reduce ′ p C O p H 2 O 1 + 2 K C O 2 A …”

Transient modeling of biomass steam gasification with Co3O4

“…Although measuring the total molar flow rate has a faster response time than measuring the outlet gas composition, it only presents the total reaction conversion and is not able to predict the individual conversion of reactions involved in the gasification. Salaices et al [15,16] studied the kinetics of cellulose gasification in a batch fluidized bed reactor. They calculated the overall conversion by measuring the total pressure in the reactor and were able to sample at several times and determine the production rate of each individual gas.…”