<i>In situ</i> MnO<sub>x</sub>/N-doped carbon aerogels from cellulose as monolithic and highly efficient catalysts for the upgrading of bioderived aldehydes

Zhou, Shuli; Chen, Guixian; Xing, Feng; Wang, Ming; Song, Tao; Liu, Detao; Lu, Fachuang; Hu, Qi

doi:10.1039/c8gc01413b

Cited by 56 publications

(33 citation statements)

References 55 publications

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“…4(a), all of the samples exhibited type IV isotherms but different H3 hysteresis loops at P/I 0 ranging from 0.45 to 1.0, from which it could be concluded that there existed both micropores and mesopores in all of the catalysts; thus, a porous structure developed in these obtained catalysts after being calcined. 23,24 This conclusion was further demonstrated in Fig. 4(b) as the sizes of these gained catalysts mainly ranged from 1 to 5 nm.…”

Section: Characterizationssupporting

confidence: 58%

Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route

Guo

Zhi

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Benzene (C6H6) is a typical kind of volatile organic compound (VOC) which can exert great harm to both human health and the environment, and, thus, which needs to be eliminated before its emission. In this work, porous manganese–nickel (Mn‐Ni) composite oxide catalysts were synthesized through the oxalate route and applied to thermal catalytic oxidation of C6H6. By means of activity tests and relative physico‐chemical characterizations, the factors affecting the activity of those Mn‐Ni composite oxides were explored. RESULTS Nitrogen (N2)‐adsorption/desorption and X‐ray photoelectron spectroscopy (XPS) measurements indicated that the Brunauer–Elmett–Teller (BET) surface area and the content of surface‐adsorbed oxygen species were increased due to the addition of Ni into Mn oxide (MnOx). Meanwhile, the oxygen mobility and reducibility also were improved in the Mn‐Ni composite oxides. Accordingly, compared with MnOx, the Mn‐Ni catalysts showed higher activity for thermal catalytic oxidation of C6H6. Moreover, porous Mn‐Ni composite oxides with a Mn:Ni molar ratio of 4:1 (Mn4Ni1) displayed the best catalytic activity. Further investigation indicated that the excellent catalytic performance of Mn4Ni1 composite oxides could be ascribed mainly to the larger BET surface area and the richer content of surface‐adsorbed oxygen species, as well as stronger oxygen mobility and better reducibility compared with other Mn‐Ni catalysts. CONCLUSIONS The Mn4Ni1 composite oxides showed a lowest T90 value of 172 °C (C6H6 concentration 200 ppm, WHSV 60 000 mL g−1 h−1) among all of the obtained Mn‐Ni composite oxides. Moreover, it also exhibited favourable catalytic stability at 210 °C in the presence or absence of moisture. © 2019 Society of Chemical Industry

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Section: Characterizationssupporting

confidence: 58%

Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route

Guo

Zhi

et al. 2019

J of Chemical Tech & Biotech

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“…In contrast, both Ag/PCNF‐600 and Ag/PCNF‐700 show very strong adsorption peaks within 50–150 °C, which can be attributed to weak basic sites associated with the chemical and physical adsorption of CO 2 . Moreover, weak peaks formed within 150–250 °C were correspondingly assigned to medium basic sites, which demonstrates the existence of the weak chemical adsorption of CO 2 . These results further indicated that pyrolysis temperature has an important influence on the formation of surface sites in the Ag/PCNF‐ T catalysts.…”

Section: Resultsmentioning

confidence: 83%

“…[29] Moreover,w eak peaks formed within 150-250 8Cw ere correspondingly assigned to mediumb asic sites, which demonstrates the existence of the weak chemical adsorption of CO 2 . [30] These results furtheri ndicated that pyrolysis temperature has an important influence on the formation of surface sites in the Ag/PCNF-T catalysts.…”

Section: Resultsmentioning

confidence: 99%

Porous Carbon Nitride Frameworks Derived from Covalent Triazine Framework Anchored Ag Nanoparticles for Catalytic CO₂ Conversion

Lan

et al. 2019

Chemistry A European J

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Porous carbon nitride frameworks (PCNFs) with uniform and rich nitrogen dopants and abundant porosity were successfully fabricated through the direct carbonization of the covalent triazine frameworks (CTFs) at different pyrolysis temperatures and used as supports to anchor and stabilize Ag nanoparticles (NPs) for catalytic CO2 conversion. Importantly, the pyrolysis temperature plays a crucial role in the properties of porous carbon nitride frameworks. The material carbonized at 700 °C showed the highest surface area and micro‐ and mesoporous structure with a certain interlayer distance. Taking advantage of their unique surface characteristics, PCNF‐supported Ag NP catalysts (Ag/PCNF‐T, T=pyrolysis temperature) were prepared by a simple chemical method. A series of characterizations revealed that Ag NPs are embedded in the porous carbon nitride frameworks and confined to a relatively small size with high dispersion owing to the assistance of the abundant surface groups and porous structures. The as‐obtained Ag/PCNF‐T catalysts, especially Ag/PCNF‐700, showed excellent catalytic activity, selectivity, and stability for the carboxylation of CO2 with terminal alkynes under mild conditions. This can be due to the existence of abundant nitrogen atoms and diverse porosity, which resulted in highly efficient catalytic activity and stability.

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“…In Figure 4 c, the CTH reaction of furfural on O V ‐rich meso‐LMO shows a relatively high k value of 0.054. From the Arrhenius equation ln k =− E a / RT +ln A , the activation energy ( E a ) of the hydrogen transfer of furfural to FOL over O V ‐rich meso‐LMO catalyst was calculated to be 38.86 kJ mol −1 , which is advantageous than meso‐LMO (42.44 kJ mol −1 ), bulk LMO (49.29 kJ mol −1 ) and most reported catalysts (Supporting Information, Figure S7) [56, 57] . The low E a is attributed to well‐defined mesoporous structure and abundant oxygen vacancy active sites of O V ‐rich meso‐LMO catalyst.…”

Section: Resultsmentioning

confidence: 99%

A Resol‐Assisted Cationic Coordinative Co‐assembly Approach to Mesoporous ABO₃ Perovskite Oxides with Rich Oxygen Vacancy for Enhanced Hydrogenation of Furfural to Furfuryl Alcohol

Zheng

Zhang

et al. 2021

Angewandte Chemie

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It is a challenge to obtain ABO3 perovskite oxides with favorable crystal phase and well‐defined porous structure via existing approaches. Here, we design an effective and versatile strategy to construct mesoporous ABO3 perovskite oxides with functionalized nanocrystal frameworks and abundant oxygen vacancy sites via a resol‐assisted cationic coordinative co‐assembly approach. The as‐prepared oxygen vacancy‐rich mesoporous LaMnO3 as heterogeneous catalyst exhibits remarkable catalytic activity and stability for hydrogenation of furfural to furfuryl alcohol, including over 99 % conversion and 96 % selectivity. Combined with density functional theory calculation, the catalytic mechanism is elucidated, revealing that porous LaMnO3 nanocrystal framework is conducive to expose oxygen deficiency sites, which can facilitate the interaction between catalyst surface and catalytic substrate, leading to lower barrier in hydrogenation process.

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In situ MnO_x/N-doped carbon aerogels from cellulose as monolithic and highly efficient catalysts for the upgrading of bioderived aldehydes

Abstract: Cellulose-derived monolithic hierarchically porous MnOx/N-doped carbon aerogels exhibited excellent catalytic activity for the upgrading of lignocellulose-derived aldehydes.

Cited by 56 publications

References 55 publications

Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route

Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route

Porous Carbon Nitride Frameworks Derived from Covalent Triazine Framework Anchored Ag Nanoparticles for Catalytic CO₂ Conversion

A Resol‐Assisted Cationic Coordinative Co‐assembly Approach to Mesoporous ABO₃ Perovskite Oxides with Rich Oxygen Vacancy for Enhanced Hydrogenation of Furfural to Furfuryl Alcohol

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In situ MnOx/N-doped carbon aerogels from cellulose as monolithic and highly efficient catalysts for the upgrading of bioderived aldehydes

Abstract: Cellulose-derived monolithic hierarchically porous MnOx/N-doped carbon aerogels exhibited excellent catalytic activity for the upgrading of lignocellulose-derived aldehydes.

Cited by 56 publications

References 55 publications

Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route

Effective low‐temperature catalytic abatement of benzene over porous Mn‐Ni composite oxides synthesized via the oxalate route

Porous Carbon Nitride Frameworks Derived from Covalent Triazine Framework Anchored Ag Nanoparticles for Catalytic CO2 Conversion

A Resol‐Assisted Cationic Coordinative Co‐assembly Approach to Mesoporous ABO3 Perovskite Oxides with Rich Oxygen Vacancy for Enhanced Hydrogenation of Furfural to Furfuryl Alcohol

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In situ MnO_x/N-doped carbon aerogels from cellulose as monolithic and highly efficient catalysts for the upgrading of bioderived aldehydes

Porous Carbon Nitride Frameworks Derived from Covalent Triazine Framework Anchored Ag Nanoparticles for Catalytic CO₂ Conversion

A Resol‐Assisted Cationic Coordinative Co‐assembly Approach to Mesoporous ABO₃ Perovskite Oxides with Rich Oxygen Vacancy for Enhanced Hydrogenation of Furfural to Furfuryl Alcohol