Deep Insight into the Mechanism of Catalytic Combustion of CO and CH₄ over SrTi_1–xB_xO₃ (B = Co, Fe, Mn, Ni, and Cu) Perovskite via Flame Spray Pyrolysis

Abstract

Perovskites have been recognized as affordable substitutes for noble-metal catalysts for their tunable catalytic activity and thermal stability. Nevertheless, the highly demanding synthesis procedure still hinders the application of perovskites in catalytic combustion. In this work, a series of nanostructured SiTiO3 perovskites with B-site partial substitution by Co, Fe, Mn, Ni, and Cu are synthesized via flame spray pyrolysis in one step. The comprehensive characterizations on textural properties of nanostructured perovskites reveal that the flame-made perovskite nanoparticles all exhibit high crystal purity and large specific surface area (∼40 m2/g). Furthermore, the highest catalytic activity is achieved by SrTi0.5Co0.5O3 due to the formation of favorable oxygen vacancies, outstanding reducibility, and oxygen desorption capability. Additionally, the presence of 10 vol % water vapor during long-term testing indicates remarkable durability and water resistance. Finally, the CO oxidation and CH4 dehydrogenation on SrTiO3 incorporating Co atoms are more thermodynamically and kinetically favorable than those on other doped surfaces.

Advancement of modification engineering in lean methane combustion catalysts based on defect chemistry

“…In comparison with single dopants, multi-dopants show greater potential to enhance the catalytic performance of methane combustion by combining the advantages of two or more dopants. 155–157 Toscani et al 158 prepared nanostructured mixed oxides of CeO 2 –ZrO 2 –Sc 2 O 3 by citrate complexation. The effect of the co-substitution of ZrO 2 and Sc 2 O 3 in CeO 2 was evaluated in terms of the sample's reducibility and its catalytic activity to methane oxidation.…”

“…In comparison with single dopants, multi-dopants show greater potential to enhance the catalytic performance of methane combustion by combining the advantages of two or more dopants. [155][156][157] Toscani et al 158 In addition, metal-organic framework materials (MOFs) are organic-inorganic hybrid polymers formed by the coordination polymerization of metal ions and organic ligands. 159,160 Using MOF materials as porous precursors, metal element species can be mixed at the atomic level.…”

Flame Spray Pyrolysis Synthesis of Vo-Rich Nano-SrTiO3-x

“…Herein, we show that FSP-made SrTiO 3 with controlled Vos is a novel approach towards enhanced photoactivity. Previously, Yuan et al presented FSP-made SrTiO 3 with dopings of Co, Fe, Mn, Ni and Cu [ 23 , 24 ]. Our previous work showcased La-doping and CuO-heterojunction on SrTiO 3 enhancement and selective H 2 vs. CH 4 photocatalytic production from H 2 O/CH 3 OH [ 25 ].…”

Transition metal-doped SrTiO3: when does a tiny chemical impact have such a great structural response?

“…43 Third, chemical doping of STO with transition metal atoms can lead to the emergence of new physical phenomena and functionality, including glassy/relaxor properties, 44 multiferroic properties, 45 superconductivity, 46 and critical quantum multiferroicity. 47 Fourth, STO containing transition metals has already found chemical applications as mixed electronic-ion conductor materials, 48,49 catalysts, 50 oxygen storage, 51 and anodes in fuel cells, 52 highlighting the need for a thorough comprehension of the associated mechanisms of structure formation.…”