Revelation of Mn4+-Osur-Mn3+ active site and combined Langmuir-Hinshelwood mechanism in propane total oxidation at low temperature over MnO2

Feng, Chao; Jiang, Fei; Xiong, Gaoyan; Chen, Chong; Wang, Zhong; Pan, Yuan; Fei, Zhaoyang; Lu, Yukun; Li, Xuebing; Zhang, Runduo; Liu, Yunqi

doi:10.1016/j.cej.2022.138868

Cited by 42 publications

(19 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As illustrated in Figure 5a, the peak at 207 °C for MnO 2 /CF could be ascribed to the reducing δ-MnO 2 . 8,34 However, this peak in MnO 2 -O v -0.04/ CF shifts to a lower position with a temperature of 196 °C, suggesting a stronger reducibility of δ-MnO 2 in MnO 2 -O v -0.04/CF. 15 In addition, the intensity of the reduction peak for MnO 2 -O v -0.04/CF is stronger than that for MnO 2 /CF.…”

Section: Catalytic Performance For Toluene Oxidationmentioning

confidence: 95%

“…Volatile organic compounds (VOCs), emitted by various industrial processes and residential activities, have drawn worldwide attention because of their adverse impact on air quality and human health. , Catalytic oxidation is an effective method to control the emission of VOC, and the utmost priority for this technology is the development of highly efficient catalysts. − Generally, the catalysts could be classified into two categories, i.e., the noble metal-based catalysts and the transition metal oxide-based catalysts. , Among them, manganese dioxide (MnO 2 ) can be regarded as one of the most promising candidates due to its nature of low cost, substantial reserves, changeable crystal structures (α-, β-, γ-, δ-, and λ-MnO 2 ), and varying valences (Mn 2+ , Mn 3+ , and Mn 4+ ). − However, compared to the noble metal-based catalysts, the catalytic activity of MnO 2 at low temperatures is inferior, which is the major obstacle to its large-scale practical application. , …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Redox-Induced In Situ Growth of MnO₂ with Rich Oxygen Vacancies over Monolithic Copper Foam for Boosting Toluene Combustion

Huang

Zhao

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

Catalytic combustion has been known to be an effective technique in volatile organic compound (VOC) abatement. Developing monolithic catalysts with high activity at low temperatures is vital yet challenging in industrial applications. Herein, monolithic MnO2-Ov/CF catalysts were fabricated via the in situ growth of K2CuFe(CN)6 (CuFePBA, a family of metal–organic frames) over copper foam (CF) followed by a redox-etching route. The as-synthesized monolith MnO2-Ov-0.04/CF catalyst displays a superior low-temperature activity (T90% = 215 °C) and robust durability for toluene elimination even in the presence of 5 vol % water. Experimental results reveal that the CuFePBA template not only guides the in situ growth of δ-MnO2 with high loading over CF but also acts as a source of dopant to create more oxygen vacancies and weaken the strength of the Mn–O bond, which considerably improves the oxygen activation ability of δ-MnO2 and consequently boosts the low-temperature catalytic activity of the monolith MnO2-Ov-0.04/CF toward toluene oxidation. In addition, the reaction intermediate and proposed mechanism in the MnO2-Ov-0.04/CF mediated catalytic oxidation process were investigated. This study provides new insights into the development of highly active monolithic catalysts for the low-temperature oxidation of VOCs.

show abstract

Section: Catalytic Performance For Toluene Oxidationmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Redox-Induced In Situ Growth of MnO₂ with Rich Oxygen Vacancies over Monolithic Copper Foam for Boosting Toluene Combustion

Huang

Zhao

et al. 2023

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…1−5 Propane is widely regarded as one of the most representative VOCs due to its stable chemical nature and high bonding energy. 6−8 A series of catalysts have been utilized for propane oxidation, including supported noble metal catalysts such as Pt, 9 Pd, 10 Ru, 11 and transition-metal oxide catalysts such as Co, 12 Mn, 13,14 and Ni. 15 Among these catalysts, Pt-based catalysts have been the preferred choice for the oxidation of propane because of their strong activation of C−H bonds and wide industrial applications.…”

Section: Introductionmentioning

confidence: 99%

“…A series of catalysts have been utilized for propane oxidation, including supported noble metal catalysts such as Pt, Pd, Ru, and transition-metal oxide catalysts such as Co, Mn, , and Ni . Among these catalysts, Pt-based catalysts have been the preferred choice for the oxidation of propane because of their strong activation of C–H bonds and wide industrial applications. − It has been reported that the chemical state of Pt plays an important role in the total oxidation of propane.…”

Section: Introductionmentioning

confidence: 99%

Preformed Pt Nanoparticles Supported on Nanoshaped CeO₂ for Total Propane Oxidation

Ge,

Chen,

Tang

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Pt-based catalysts have been widely used for the removal of short-chain volatile organic compounds (VOCs), such as propane. In this study, we synthesized Pt nanoparticles with a size of ca. 2.4 nm and loaded them on various fine-shaped CeO2 with different facets to investigate the effect of CeO2 morphology on the complete oxidation of propane. The Pt/CeO2-o catalyst with {111} facets exhibited superior catalytic activity compared to the Pt/CeO2-r catalyst with {110} and {100} facets. Specifically, the turnover frequency (TOF) value of Pt/CeO2-o was 1.8 times higher than that of Pt/CeO2-r. Moreover, Pt/CeO2-o showed outstanding long-term stability during 50 h. X-ray photoelectron spectroscopy (XPS) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) revealed that the excellent performance of Pt/CeO2-o is due to the prevalence of metallic Pt species, which promotes C–C bond cleavage and facilitates the rapid removal of surface formate species. In contrast, a stronger metal–support interaction in Pt/CeO2-r leads to easier oxidation of Pt species and the accumulation of intermediates, which is detrimental to the catalytic activity. Our work provides insight into the oxidation of propane on different nanoshaped Pt/CeO2 catalysts.

show abstract

“…Due to their abundance, high oxygen storage capacity, tunable crystal phases, high oxide reduction rates, and high OV formation at low temperatures, manganese oxides (MnOx) are regarded as the most suitable transition metal oxides to be employed as a catalyst for oxidation reactions . Very recently, Feng et al reported a detailed low-temperature propane oxidation mechanistic pathway through the Mn 4+ –O sur –Mn 3+ active site using an α-type manganese oxide octahedral molecular sieve crystal system; however, this catalyst still suffers with respect to the reaction temperature …”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Total Oxidation of Propane Using Silver-Decorated MnO₂ Nanorods

Rajesh

Lingalwar

Challa

et al. 2023

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

The interaction between active metal centers and supports can be tailored by the judicious combination of morphologically specific metal nanoparticles and metal oxide supports such that the efficacy of the catalysts could be enhanced for practical suitability. Herein, structurally engineered spherical silver nanoparticles (AgNPs) were decorated on manganese oxide nanorods (MnO2NRs), and their catalytic efficacy toward complete oxidation of propane has been explored. It was observed that 1 wt % Ag-loaded catalysts (1Ag/MnO2NRs) exhibited the highest catalytic activity, where the temperatures required for the oxidation of 10% (T 10%), 50% (T 50%), and 90% (T 90%) of propane were 130, 160, and 190 °C, respectively, with apparent activation energy as low as 42.73 kJ mol–1. Strong metal–support interaction between AgNPs and MnO2NRs leads to an increase in the oxygen vacancies and activation of surface oxygen. A series of investigations including X-ray photoelectron spectroscopy, temperature-programmed desorption by oxygen, temperature-programmed reduction by hydrogen, and in situ DRIFTS were carried out in an effort to establish the mechanistic pathway, and it could be concluded that the 1Ag/MnO2NR has substantiated impressive catalytic activity through Mars–van–Krevelen mechanism. Furthermore, 1Ag/MnO2NR has demonstrated remarkable activity and stability when compared with the current benchmark catalysts and thus can be considered as a proficient catalyst toward total oxidation of propane from industrial exhausts.

show abstract

Revelation of Mn4+-Osur-Mn3+ active site and combined Langmuir-Hinshelwood mechanism in propane total oxidation at low temperature over MnO2

Cited by 42 publications

References 52 publications

Redox-Induced In Situ Growth of MnO₂ with Rich Oxygen Vacancies over Monolithic Copper Foam for Boosting Toluene Combustion

Redox-Induced In Situ Growth of MnO₂ with Rich Oxygen Vacancies over Monolithic Copper Foam for Boosting Toluene Combustion

Preformed Pt Nanoparticles Supported on Nanoshaped CeO₂ for Total Propane Oxidation

Low-Temperature Total Oxidation of Propane Using Silver-Decorated MnO₂ Nanorods

Contact Info

Product

Resources

About

Revelation of Mn4+-Osur-Mn3+ active site and combined Langmuir-Hinshelwood mechanism in propane total oxidation at low temperature over MnO2

Cited by 42 publications

References 52 publications

Redox-Induced In Situ Growth of MnO2 with Rich Oxygen Vacancies over Monolithic Copper Foam for Boosting Toluene Combustion

Redox-Induced In Situ Growth of MnO2 with Rich Oxygen Vacancies over Monolithic Copper Foam for Boosting Toluene Combustion

Preformed Pt Nanoparticles Supported on Nanoshaped CeO2 for Total Propane Oxidation

Low-Temperature Total Oxidation of Propane Using Silver-Decorated MnO2 Nanorods

Contact Info

Product

Resources

About

Redox-Induced In Situ Growth of MnO₂ with Rich Oxygen Vacancies over Monolithic Copper Foam for Boosting Toluene Combustion

Redox-Induced In Situ Growth of MnO₂ with Rich Oxygen Vacancies over Monolithic Copper Foam for Boosting Toluene Combustion

Preformed Pt Nanoparticles Supported on Nanoshaped CeO₂ for Total Propane Oxidation

Low-Temperature Total Oxidation of Propane Using Silver-Decorated MnO₂ Nanorods