Improved performance of bimetallic oxides CuO–Y₂O₃ synthesized by sol–gel for methanol steam reforming

Abstract

A series of bimetallic oxide catalysts CuO-Y 2 O 3 were synthesized by different sol-gel methods for methanol steam reforming (MSR). The performance of the synthesized catalyst was investigated by characterization of X-ray diffraction, Brunauer-Emmett-Teller, scanning electron microscopy, transmission electron microscope, and X-ray photoelectron spectrometer techniques. The effects of different complexing agents on the property of the CuO-Y 2 O 3 were identified. The results showed that CuO-Y 2 O 3 synthesized by citric acid-EDTA as a complexing agent showed the best performance, which has the largest specific surface area and shows the highest dispersion of particles and lowest average size than others. The relatively large specific surface area could increase the contact area between the catalyst and the feed, thereby improving the catalytic performance of the catalyst. Moreover, without hydrogen reduction treatment, the selectivity of hydrogen to CuO-Y 2 O 3 can reach more than 99%, whereas the selectivity of CO is only 0.3% (under the reaction conditions: temperature of 300 • C, the ratio of water to methanol of 4:1, feed flow rate of 4 ml/h). The addition of yttrium enhances the interaction of the two active components, copper and yttrium, thereby preventing the migration of the active components. This work provides a potential and economical Cu-Y oxide catalyst for onboard in situ hydrogen production from MSR, because it can reduce the hydrogen reduction process time.

CuO‐modified LaNi0.4Al0.6O3−δ with improvement performance in MSR at low temperature

“…The characteristic peaks at 2 correspond to the BE of surface‐adsorbed oxygen (O 2 ) or oxygen in surface hydroxyl groups. The characteristic peak at 3 is derived from the electron BE of perovskite oxide lattice oxygen (O 2− ) 15,23 . Due to the high BE adsorption of oxygen in this catalyst, it is beneficial for the formation of strongly oxidized species.…”

“…The XRD characterization was analyzed by using the Bruker AXS D8 X‐ray spectrometer. The calculation formulas of mean crystallite size and lattice distortion refer to previous work 15 . Tecnai G2 F20 field emission electron microscope of Philips FEI was used to observe the shape and size of mean crystallites in the sample.…”

“…The calculation formulas of mean crystallite size and lattice distortion refer to previous work. 15 Tecnai G2 F20 field emission electron microscope of Philips FEI was used to observe the shape and size of mean crystallites in the sample. Contact NOVA 2200E automatic specific surface and porosity analyzer was used to compare the surface area and pore volume for detection.…”

“…The characteristic peak at 3 is derived from the electron BE of perovskite oxide lattice oxygen (O 2− ). 15,23 Due to the high BE adsorption of oxygen in this catalyst, it is beneficial for the formation of strongly oxidized species. In MSR reactions, oxidation and dissociation of methanol are associated with surface oxygen species.…”

“…15 wt%CuO/LaNi 0.4 Al 0.6 O 3−δ samples are shown in Figures5 and 6, respectively. Figures5a and 6ashow the full spectrum of a 15 wt% CuO/LaNi 0.4 Al 0.6 O 3−δ sample, which can be seen to contain Cu, La, Ni, Al, O, and C elements.…”