Role of Pr on Ni–Mg–Al Mixed Oxides Synthesized by Microwave-Assisted Self-Combustion for Dry Reforming of Methane

Abstract

Pr (1–12% wt) promoted Ni–Mg–Al mixed oxides were synthesized by the microwave-assisted self-combustion method. The promoting role of Pr on the physical and chemical properties and the catalytic performance in dry reforming of methane (DRM) were studied. Several techniques were used to evaluate the chemical composition and the thermal, structural, reductive, basic, textural, and morphological properties of the oxides. Catalytic stability tests in DRM at 600 °C after reduction in reactant flow at 700 °C were performed. The increase in the Pr load promotes the reduction of Ni, enhances the thermal stability of the basic sites and the CO2-capture capacity at high temperature, and decreases the Ni0 particle sizes. Pr does not affect the conversion, but it improves the stability in correlation with the thermal stability of basic sites and Ni0 particle sizes. The 6% wt Pr-promoted catalyst showed the best performance among all the samples studied.

Improved Effect of Fe on the Stable NiFe/Al2O3 Catalyst in Low-Temperature Dry Reforming of Methane

“…Syngas derived from the renewable biomass process has attracted tremendous interests for the generation of various value-added chemicals and fuel, yet biogas inevitably contains carbon dioxide (CO 2 ) and methane (CH 4 ) during the biomass gasification. , Therefore, there is a growing concern on converting the two greenhouse gases to syngas as a desirable procedure for the upgrading of biomass-derived syngas. Dry reforming of methane (DRM) has been regarded as an alternative route for the effective utilization of CO 2 and CH 4 to the syngas. − Generally, DRM reaction requires high reaction temperature (>650 °C) because of its endothermic characteristic. Besides noble-based catalysts, Ni-based catalysts exhibit comparable activity and selectivity to H 2 ; whereas the sintering of Ni nanoparticles (NPs) (low Tammann temperature of Ni) and coke deposition (CO and CH 4 dissociation) quickly deactivate the catalyst during the high-temperature reaction.…”

Carbon-resistant NiO-Y2O3-nanostructured catalysts derived from double-layered hydroxides for dry reforming of methane

“…Additionally, other side reactions such as gasification of carbon deposits and the Boudouard reaction could have also taken place [13,40]. Moreover, in the study of Ojeda-Niño et al [41] a series of Ni-Mg-Al hydrotalcites were synthesized by the microwave-assisted self-combustion method and promoted by different concentrations of praseodymium, i.e., 1.2 wt.%, 5.9 wt.% and 11.4 wt.%.…”

Microwave-assisted dry reforming of methane for syngas production: a review

“…In the study of microwave-assisted DRM activity with respect to the stability, Ojeda-Niño et al (2019) found that the incorporation of Pr not only significantly enhance the thermal stability for the Ni-Mg-Al catalysts at hightemperature microwave-assisted DRM but also promote the CO 2 adsorption in a capture-release reversible dynamic depending on the basicity strength. Overall, they discovered that the Pr loading did not has a direct correlation Fig.…”