Syngas Production via CO2 Reforming of Methane over SrNiO3 and CeNiO3 Perovskites

Abstract

The development of a transition-metal-based catalyst with concomitant high activity and stability due to its distinguishing characteristics, yielding an abundance of active sites, is considered to be the bottleneck for the dry reforming of methane (DRM). This work presents the catalytic activity and durability of SrNiO3 and CeNiO3 perovskites for syngas production via DRM. CeNiO3 exhibits a higher specific surface area, pore volume, number of reducible species, and nickel dispersion when compared to SrNiO3. The catalytic activity results demonstrate higher CH4 (54.3%) and CO2 (64.8%) conversions for CeNiO3, compared to 22% (CH4 conversion) and 34.7% (CO2 conversion) for SrNiO3. The decrease in catalytic activity after replacing cerium with strontium is attributed to a decrease in specific surface area and pore volume, and nickel active sites covered with strontium carbonate. The stability results reveal the deactivation of both the catalysts (SrNiO3 and CeNiO3) but SrNiO3 showed more deactivation than CeNiO3, as demonstrated by deactivation factors. The catalyst deactivation is mainly attributed to carbon deposition and these findings are verified by characterizing the spent catalysts.

Synergistic impacts of sonolysis aided photocatalytic degradation of water pollutant over perovskite-type CeNiO3nanospheres

“…45 CeNiO 3 (CNO) perovskite or Ce–Ni–O phase composites are found to be beneficial in a variety of application domains, which include supercapacitors, syn -gas production, photocatalyst for water purification, CO oxidation, and hydrogen production via water splitting. 46–50…”

“…45 CeNiO 3 (CNO) perovskite or Ce-Ni-O phase composites are found to be beneficial in a variety of application domains, which include supercapacitors, syn-gas production, photocatalyst for water purification, CO oxidation, and hydrogen production via water splitting. [46][47][48][49][50] In this report, perovskite-type CeNiO 3 (CNO) nanostructures (NSs) were successfully prepared via a simple hydrothermal pathway followed by sintering at 800 1C. CNO NSs were used as a sonophotocatalyst for the decomposition of orange-G (OG) azo dye in aqueous solutions.…”

Supercritical fluid-assisted modification combined with the resynthesis of SmCoO3 as an effective tool to enhance the long-term performance of SmCoO3-derived catalysts for the dry reforming of methane to syngas

“…Noteworthily, long-term stability was not studied (or was insufficiently high) for a majority of reported catalysts derived from LnMO 3 (M = Co/Ni) perovskites or related oxides. 28,29,62–85 Only few of these studies dealt with the proper characterization of the long-term stability concerning the determination of syngas yields along with reactant conversions. For instance, moderate CO (50%) and H 2 (42%) yields were achieved during the 50 h exploitation of LaNiO 3 -derived catalyst produced in ref.…”

Green Fabrication of Heterostructured CoTiO3/TiO2 Nanocatalysts for Efficient Photocatalytic Degradation of Cinnamic Acid

“…This method uses citric acid as a complexing agent and metallic nitrates as precursors. Several other synthesis methods are also used for the preparation of perovskites, such as the Pechini method, sol–gel self-combustion method that uses citric acid monohydrate (C 6 H 8 O 7 ·H 2 O) as the complexing agent, and lanthanum oxide (La 2 O 3 ), cobalt nitrate hexahydrate (Co­(NO 3 ) 2 ·6H 2 O), nickel nitrate hexahydrate (Ni­(NO 3 ) 2 ·6H 2 O), and ferric nitrate nonahydrate (Fe­(NO 3 ) 3 ·9H 2 O) as precursors, and the self-combustion method that uses metallic nitrates and glycine as a precursor for the preparation of nanocrystalline perovskites, Ce x Sr 1– x NiO 3 ( x = 0.6–1.0), nanocrystals SrNiO 3 and CeNiO 3 , and La 1– x Sr x NiO 3 perovskite-type oxides. , Of the methods used to prepare perovskite-like materials, hydrothermal synthesis in supercritical water has advantages because the reaction rate is enhanced more than 10 3 times that under the conventional hydrothermal conditions with the products of high crystallinity and at relatively low temperatures, below 300 °C, since ionic products (Kw) have a maximum value of around 250–300 °C . Hydrothermal methods for preparing fine metal oxide particles in subcritical and supercritical water have been developed using batch reaction − and flow reaction systems. − …”