Volatile organic compounds (VOCs), as a significant contributor to atmospheric pollution such as ozone pollution and PM2.5, bring serious harm to the environment and human health. Catalytic oxidation is one...

Oxygen Vacancies in Catalyst for VOCs Oxidation: Synthesis, Characterization, Catalytic Effects

Constructing non-noble robust catalysts for deep catalytic oxidation of obstinate light alkanes at low temperature is of great value and significance. Herein, we designed a facile solvent-thermal-reduction strategy to fabricate an O-vacancy-rich porous MnO2 nanosheet (MnO2−PS) catalyst for propane catalytic oxidation. The abundant vacancies in MnO2−PS catalysts can significantly promote its redox ability and oxygen activation capacity, and then provide more active oxygen species with enhanced oxygen mobility and reactivity, thus accelerate the cleavage of C-H bond and the decomposition of intermediates. Meanwhile, benefiting from the porous nanosheet structure, MnO2−PS catalyst possesses highly accessible surface and high density of exposed active sites, thus facilitating the adsorption and the activation of reactant molecule. At the same time, the catalyst also exhibits good thermal stability and water resistant ability. This robust and efficient catalytic system may provide some enlightenments for designing feasible catalyst with high-performance for deep catalytic destruction of VOCs. 

O-vacancy-rich Porous MnO2 Nanosheets as Highly Efficient Catalysts for Propane Catalytic Oxidation

The research on new energy storage technologies has been sparked by the energy crisis, the greenhouse effect, and air pollution, leading to the continued development and commercialization of electrochemical energy...

Carbon neutrality strategies for sustainable batteries: from structure, recycle, property to application

The synthesis method of precious metal catalysts would affect the electronic metal-support interaction (EMSI) of catalysts, which further affected the catalytic activity. In this paper, Co3O4 was obtained as support by the pyrolysis of ZIF-67 as a template sacrificial agent, and Pt species were loaded by three different reduction methods. Among them, the catalyst produced by the NaBH4 reduction method possessed the best activity with T90 of 168 °C. Through a series of characterization and experiments, it was found that the EMSI of the catalyst was optimized by this synthesis method, which led to electron transfer among Pt species and Co3O4. The catalysts also exhibited excellent water resistance, stability, and recycling performance. The possible degradation mechanism of toluene was also revealed by in situ DRIFTS and GC–MS. This paper provided ideas for the construction of catalysts and a theoretical reference for the relevant verification of EMSI. 

Regulating electronic metal-support interaction by synthetic methods to enhance the toluene degradation over Pt/Co3O4 catalysts

Fe-doped LaCoO3 perovskite catalysts synthesized via a facile citric acid-assisted sol-gel route have been applied for the H2S selective oxidation. The as-synthesized LaFexCo1−xO3 perovskites exhibit a randomly macroporous structure formed by the accumulation of nanoparticles. Characterization studies reveal that appropriate Fe substitution effectively enhances the formation of oxygen vacancies, and thus improves the lattice oxygen mobility and H2S adsorbability, respectively. The obtained LaFe0.4Co0.6O3 exhibited remarkable catalytic activity, with the H2S conversion and sulfur yield of 100% at 190 °C. A combined approach of in-situ FT-IR and in-situ Raman experiments disclosed that the plausible reaction pathway of H2S selective oxidation over LaFexCo1−xO3 perovskites follows the Mars-van Krevelen mechanism. The density functional theory calculations revealed that Fe-doping improves the formation of oxygen vacancy and enhances the adsorption of H2S. This study offers new insights for the design of highly efficient perovskites for the selective oxidation of H2S. 

Oxygen vacancies engineering of Fe doped LaCoO3 perovskite catalysts for efficient H2S selective oxidation

Herein, a feasible strategy was reported to reuse the waste ternary lithium-ion batteries (TLIBs) as precursors to develop efficient CoMnNiOx catalysts for propane oxidation. Interestingly, the T90 value of the defect enhanced-CoMnNiOx catalyst for propane oxidation was only 200 °C. The de-aluminum and de-lithium process generated by the alkaline etching promoted the increase of the oxygen vacancy defects, which was confirmed by ICP-OES, XPS, EPR and DFT calculations. At the atomic level, the oxygen vacancies near the aluminum and lithium vacancies (NiO-Alv-Ov and NiO-Liv-Ov) were more likely to promote the activation of oxygen molecules. Furthermore, it was observed that the reducibility, acidity and lattice oxygen mobility of the defective CoMnNiOx catalyst were boosted by the presence of abundant oxygen vacancy defects, and thus enhancing the catalytic activity. Remarkably, the TLIBs recycling and defect enhancement engineering are conducive for the development of the green and efficient catalysts for VOCs oxidation. 

Defect enhanced CoMnNiOx catalysts derived from spent ternary lithium-ion batteries for low-temperature propane oxidation

Unveiling the Balance between Catalytic Activity and Water Resistance over Co3O4 Catalysts for Propane Oxidation: The Role of Crystal Facet and Oxygen Vacancy

Chlorinated volatile organic compounds (CVOCs) are a class of hazardous pollutants that severely threaten environmental safety and human health. Although the catalytic oxidation technique for CVOCs elimination is effective, enhancing the catalytic efficiency and simultaneously inhibiting the production of organic byproducts is still of great challenge. Herein, Ru‐substituted LaMn(Ru)O3+δ perovskite with Ru–O–Mn structure and weakened Mn–O bond strength has been developed for catalytic oxidation of chlorobenzene (CB). The formed Ru–O–Mn structure serves as favorable sites for CB adsorption and activation, while the weakening of Mn–O bond strength facilitates the formation of active oxygen species and improves oxygen mobility and catalyst reducibility. Therefore, LaMn(Ru)O3+δ exhibits superior low‐temperature activity with the temperature of 90% CB conversion decreasing by over 90 °C compared with pristine perovskite, and the deep oxidation of chlorinated byproducts produced in low temperature is also accelerated. Furthermore, the introduction of water vapor into reaction system triggers the process of hydrolysis oxidation that promotes CB destruction and inhibits the generation of chlorinated byproducts, due to the higher‐activity *OOH species generated from the dissociated H2O reacting with adsorbed oxygen. This work can provide a unique, high‐efficiency, and facile strategy for CVOCs degradation and environmental improvement.

Simultaneously Constructing Active Sites and Regulating Mn–O Strength of Ru‐Substituted Perovskite for Efficient Oxidation and Hydrolysis Oxidation of Chlorobenzene

Oxygen activation-boosted manganese oxide with unique interface for chlorobenzene oxidation: Unveiling the roles and dynamic variation of active oxygen species in heterogeneous catalytic oxidation process

Synergistically convert acid gases to valuable chemicals is meaningful. Herein, unsupported CoMo sulfide catalysts with abundant sulfur vacancies were fabricated to attain synergistical conversion of H2S and CO2 to COS. Various metal sulfides were obtained, such as Co3S4, Co9S8 and vacancy-defective MoS2. Besides, simultaneous sulfidation of Mo with Co prompted formation of CoMoS phase, which enhanced catalytic performance. Among them, CoAlMo-S catalyst exhibited superior activity, allowing for equilibrium COS yield (6%, 300 ℃). DFT calculations indicate that chemisorbed H2S induced CO2 activation via van der Waals interaction between C atom in CO2 and S atom in H2S, contributed to efficient C–S bond formation. Sulfur vacancy significantly promoted dissociative adsorption of H2S while Co atom in CoMoS phase was beneficial for CO2 adsorption and facilitated C–S bond construction. This work not only achieves H2S pollution control and carbon emission reduction, but also provides an alternative approach to synthesis COS. 

Synergistic Conversion of Acid Gases (H2S and CO2) to Valuable Chemicals: Carbonyl Sulfide Synthesis over Vacancy-Defective CoMo Sulfide Catalysts

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