Finite element solution for gas–solid reactions: Application to the moving boundary problems

Gas-phase removal of hydrogen sulfide using iron oxyhydroxide at low temperature: Measurement of breakthrough curve and modeling of sulfidation mechanism

“…Hartmann examined several mathematical models for describing the gas-solid reaction between H 2 S with ZnO, and showed that the experimental results were best fitted by a model that considered both the reacted-shell diffusion and the reaction of the unreacted core at the interface [10]. Ebrahimi showed that a grain model with product layer resistance is suitable for explaining the gas-solid reaction between H 2 S and ZnO under different pellet size and temperature conditions [11]. More recently, we studied the gaseous-phase adsorption mechanism of H 2 S on ZnO adsorbents with different crystallite sizes by measuring a packed-bed breakthrough curve (BTC) [12].…”

“…Zinc oxide (ZnO) is one of a number of metal oxides that have been used in practical desulfurization processes. To improve the adsorption performance, the sulfidation mechanism of ZnO during the desulfurization reaction has been intensively studied from both scientific and engineering viewpoints [10][11][12]. Hartmann examined several mathematical models for describing the gas-solid reaction between H 2 S with ZnO, and showed that the experimental results were best fitted by a model that considered both the reacted-shell diffusion and the reaction of the unreacted core at the interface [10].…”

Synthesis Gas and Zinc Production in a Noncatalytic Packed‐Bed Reactor

“…(6)- (13) described in the work of Afshar Ebrahimi et al [27,28]. The reaction rate constant (which appears in the reaction as the Thiele modulus, f) is obtained from the work of Ale Ebrahim and Jamshidi [11,12].…”

Experimental investigation and mathematical modeling of physical activated carbon preparation from pistachio shell

“…In this work, for solving equations (27)(28)and evaluating conversion-time profiles, a finite element method was used [31,32]. The growth of pore-radius converts the reaction from the diffusion control regime at initial activation times into a kinetic control regime at final times.…”