Steam reforming of ethanol to hydrogen formation: Kinetic modeling and experimental investigations

Abstract

To derive the kinetic model for steam reforming of ethanol, the experiment tests were accomplished at vast working conditions (i.e., temperature: 300-900 • C, pressure: 1-11 bar, and H 2 O/C 2 H 5 OH ratio (S/E) of 3-21) on the Ni-Pt/CeO 2 catalyst in a fixed bed reactor. The physicochemical properties of the prepared catalyst were investigated by x-ray fluorescence, thermal gravimetric analysis x-ray diffractometer, and N 2 adsorption/desorption Brunauer-Emmett-Teller (BET) tests. The kinetic model was developed based on the Langmuir-Freundlich approach, and the proposed mechanism included four reversible reactions on two types of the active site. The values of estimated activation energy for four reactions were in the range of reported values by various workers. The kinetic model error to anticipate the responses was 11.96% and a well forecasted H 2 yield compared to other responses. The complete ethanol conversion reached above 700 • C at 1 bar pressure irrespective of the S/E value. The variation of CO yield in terms of temperature was very low up to 700 • C. An augmentation in S/E, enhanced ethanol conversion and H 2 yield, while these trends were reversed for CO yield and CH 4 selectivity.

The kinetic and experimental study for the syngas production from ethanol dry reforming over a Ni‐Cu / La 2 O 3 catalyst

“…This decrease in actual loading of active metals may probably be related to the segments of Ni and Cu species that were not impregnated on La 2 O 3 support during the catalyst synthesis, which was reported by different scientists. 42,43 The results of the N 2 adsorption-desorption test were determined in Table 3. The surface area of La 2 O 3 support was declined from 124.57 to 86.36 m 2 g À1 after impregnating nickel and copper.…”

“…Arrhenius relation (Equation ( 31)) is the model, which described the variations of the reaction rate constant with temperature most accurately. [38][39][40][42][43][44]…”

“…According to the components involved in our experimental tests, PC-SAFT was a suitable EoS to estimate the behavior of phase equilibrium. [40][41][42][43][44]…”

“…Also, the Van't-Hoff relation (Equation ( 32)) was employed for measurement of the equilibrium constants in terms of temperature as follows 42 :…”