Catalytic performance and kinetic modeling of ethylene glycol steam reforming over surfactant-modified Pd-Ni/KIT-6

In the current study, steam reforming of ethylene glycol as a well-known bio-oxygenate, was carried out over 2%Pd-10%Ni/KIT-6 catalyst in a fixed-bed reactor. 2%Pd-10%Ni/KIT-6 was synthesized via surfactant-assisted impregnation method, whose physicochemical properties were determined by XRD, XRF, BET, FE-SEM, EDX-dot mapping, TEM, H-2-TPR, NH3-TPD and TGA analyses. The performance of the synthesized catalyst was investigated at temperatures from 623 to 773 K and at 10 wt% of ethylene glycol in water. Furthermore, the W-cat/F-EG0 ratio varied between 100.08 and 202.22 (g h mol(-1)). At T = 773 K and W-cat/F-EG0 = 202.22, ethylene glycol conversion and H2 yield were 99.8% and 71.36%, respectively. Also, a stability test of 2%Pd-10%Ni/KIT-6 was conducted for 28 h. No significant change was shown in the catalytic activity. Some different models were used to describe the kinetic behavior. The power-law model indicated that the reaction order changed with temperature. The kinetic data were interpreted by the Langmuir-Hinshelwood models, in which the surface reaction between the adsorbed reactants was considered as a rate determining step. The activation energy for the Langmuir-Hinshelwood and power-law models were 28.03 and 33.07 kJ mol(-1), respectively. This synthesized nanocatalyst as the first Pd-Ni/zeolite in SREG through well-known kinetics and mechanism, is superior in high stability, excellent EG conversion, good yield and selectivity to H-2 and less production of toxic products. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

In this study, steam reforming of ethylene glycol was conducted using 2%Pd-10%Ni/KIT-6 catalyst. The synthesized catalyst showed excellent stability, high ethylene glycol conversion, and good H2 yield at high temperatures.