Abstract
Hydrogen production through steam reforming of ethanol (SRE) over Mg modified Co-based catalysts supported on mesoporous SBA-15 was studied herein to evaluate the catalytic activity and the behavior of coke deposition. The CoyMgx/SBA-15 catalysts are obtained according to the steps of consecutive impregnation of Mg (x = 5 and 10 wt%) to be incorporated on SBA-15 and then follow the loading of Co (y = 10 and 20 wt%) using the incipient wetness impregnation method. The catalysts are characterized by using X-ray diffraction (XRD), temperature programmed reduction (TPR), transmission electron microscopy (TEM) and BET techniques. Also, the spent catalysts are further characterized by using XRD and TEM. The catalytic activity of the SRE is evaluated in a fixed-bed reactor under 22,000 h-1 GHSV and with an H2O/EtOH molar ratio of 13. All the CoyMgx/SBA-15 catalysts present a mesoporous structure, even after the SRE reaction. The optimum catalyst of Co20Mg5/SBA-15-H650 comes from the high loading of Co and high reduction temperature pretreatment, which show a high catalytic activity and stability at 550°C with a hydrogen yield (YH2) up to 5.78 and CO selectivity around 3.10%.
Highlights
Hydrogen generation from biomass-derived alcohols has been the activity of choice recently
The SBA-15 support (Figure 1(a)) shows a pattern with three well-resolved peaks observed at 2θ values of 0.92 ̊, 1.54 ̊ and 1.77 ̊ that correspond to the diffraction of (100), (110) and (200) planes, respectively, indicating their ordered 2D hexagonal structure with space group p6mm [13]
In order to understand the variation in the Co/Mg ratio over 67% and pretreatment with the reduction temperature effect, both the Co20Mg5/SBA-15 and Co20Mg5/ SBA-15-H650 samples are further discussed
Summary
Hydrogen generation from biomass-derived alcohols has been the activity of choice recently. Wang et al [9] reported that the addition of Na improved the catalytic performance of a PtRu/ZrO2 catalyst on the oxidative steam reforming of ethanol, where the Na enhanced the WGS reaction at a low temperature, and reduced coke deposition. High hydrogen selectivity was obtained with Mg and reduced deposited carbon with the incorporation of Ca. A promoter made up of a CexZr1−xO2 layer pre-coated on SBA-15 changes the redox properties and enhances the catalytic activity on steam reforming of methane over a Ni-based catalyst, as reported by Wang et al [19]. The catalytic performance and coking behavior of hydrogen production via SRE over mesoporous structure catalysts were considered
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
