Emerging natural and tailored perovskite-type mixed oxides–based catalysts for CO2 conversions

Abstract

The rapid economic and societal development have led to unprecedented energy demand and consumption resulting in the harmful emission of pollutants. Hence, the conversion of greenhouse gases into valuable chemicals and fuels has become an urgent challenge for the scientific community. In recent decades, perovskite-type mixed oxide-based catalysts have attracted significant attention as efficient CO2 conversion catalysts due to the characteristics of both reversible oxygen storage capacity and stable structure compared to traditional oxide-supported catalysts. In this review, we hand over a comprehensive overview of the research for CO2 conversion by these emerging perovskite-type mixed oxide-based catalysts. Three main CO2 conversions, namely reverse water gas shift reaction, CO2 methanation, and CO2 reforming of methane have been introduced over perovskite-type mixed oxide-based catalysts and their reaction mechanisms. Different approaches for promoting activity and resisting carbon deposition have also been discussed, involving increased oxygen vacancies, enhanced dispersion of active metal, and fine-tuning strong metal-support interactions. Finally, the current challenges are mooted, and we have proposed future research prospects in this field to inspire more sensational breakthroughs in the material and environment fields.

Development of Ni-doped A-site lanthanides-based perovskite-type oxide catalysts for CO2 methanation by auto-combustion method

“…reversibly shuttled between PTOs and cationic oxides, which favors the perovskite support nature and resultantly improved the catalytic activity. 53 The synthesis approach and the cationic substitutions helped to tune the physiochemical properties and promote the catalytic activity. In fact, the catalyst fabrication methods envisaged to attain better characterization results such as hydrogen consumption, CO 2 uptake capacity, high surface area, and uniform dispersion.…”

Uncovering the critical function of lanthanum in CH4 production from CO2 using exsolved LaNiO3 perovskite catalysts

“…This might seem surprising since both catalysts have similar Ni loading and surface area, and aer activation in H 2 they also show largely similar XRD patterns. One explanation of the superior perovskite-derived Ni-La 2 O 3 catalyst performance frequently suggested in the literature 26,31,33 is the creation of highly dispersed nanoparticles socketing into the oxide matrix. Actually, this morphology was also identied in our exsolved perovskite catalyst by TEM/EDX showing the formation of 6 nm Ni particles that resist sintering under the reaction conditions.…”

“…[26][27][28] Exsolution, also known as solid phase crystallization, is a process by which a homogeneous phase is separated into two or more solid phases typically upon annealing at high temperature. [29][30][31] In the case of mixed oxides under reductive conditions, one or more elements will move outwards forming metallic nanoparticles at the oxide surface leading to a morphology resembling that of supported metal catalysts. Exsolution, as opposed to traditional deposition procedures, may offer better control of the metal-support interface.…”

“…Among all, the stoichiometric LaNiO 3 perovskite is the archetype of exsolved materials because it is easy to synthesize, has a relatively simple chemistry upon reduction and above all represents an excellent catalyst for CO 2 conversion. 31 It is therefore not surprising that LaNiO 3 is probably the most studied exsolved catalyst in the literature, both in terms of physicochemical and catalytic properties. However, the great majority of these studies focus on CO 2 conversion via dry methane reforming 33 and it is hard to find reports on the performance and chemistry of LaNiO 3 in the CO 2 methanation reaction.…”

Confinement effects over Ni-based catalysts for methane dry reforming

“…Nevertheless, Ni-based catalysts face prominent problems of sintering and coking in MDR reactions. [32][33][34][35][36][37][38] Therefore, how to develop and design Ni-based catalysts with anti-sintering and anti-coking properties has become one of the hot topics in this field.…”