Kinetics of Steam Reforming of Ethanol over a Ru/Al₂O₃ Catalyst

Abstract

Catalytic steam reforming of ethanol over a Ru/γ-Al 2 O 3 catalyst in the temperature range 873-973 K was studied. The influence of inlet ethanol concentration on ethanol conversion and hydrogen yield was investigated. The conversion vs space time data was subjected to the integral method of analysis. The results show that the reaction order with respect to ethanol is 1. An activation energy of 96 kJ mol -1 was obtained. A possible reaction sequence for ethanol steam reforming was suggested. A rate expression was derived assuming that the decomposition of an activated complex formed during reaction into intermediate products was the ratedetermining step.

Hydrogen Production by Steam Reforming of Ethanol on Rh-Pt Catalysts: Influence of CeO2, ZrO2, and La2O3 as Supports

“…The ability of base metals, such as Ni [5,7,10,11], Cu [3,7], Al [12], Zn [13], and Co [14][15][16][17], and noble metals, such as Pt [18], Rh [19][20][21][22], Pd [23], Ru [24], and Ir [25], supported on various metal oxides to catalyze the SRE has been widely investigated. Ethanol activation pathways depend on the metal nature, and can be generally divided in two groups: the less-oxophilic metals (Pd and Pt) in which α-C-H activation takes place, and the more-oxophilic metals (Co, Ni, Rh, Ru) that promote activation via O-H.…”

Catalytic Hydrogen Production from Bioethanol

“…However, the knowledge accumulated during the systematic explorations of the kinetic mechanisms occurring during MSR provides a valuable starting point for ESR researchers to expand upon. In recent years, based on the observations obtained from both gas phase and sample surface, several kinetic models have been proposed to simulate the mechanistic behaviors of various catalyst systems [128][129][130][131][132], which will facilitate better understanding of the reaction mechanisms. If the estimated values are in good consistency with the reported experimental results, the assumed reaction pathways and ratedetermining step (RDS) will uncover the actual reaction mechanisms to a certain level.…”

Kinetic Modelling at the Basis of Process Simulation for Heterogeneous Catalytic Process Design

“…This kind of analysis is used in [37][38][39], where catalysts of Ru/Al2O3, Ni/MgO/Al2O and Ni/Al2O3 yielded the following kinetic parameters (Table 9). Notice very small values of the activation energy, which may indicate the presence of diffusional limitations or of highly correlated parameters.…”

“…[39]. The values for and from ref [37] (not reported in the same form, but as calculated constants at different temperatures) have been fitted with Excel™ REGRLIN (r 2 = 0.9446), while the power-law model of ref. [9] was originally presented in terms of molar flowrates rather than partial pressures.…”