Aqueous-phase oxidation of 5-hydroxymethylfurfural over Pt/ZrO2 catalysts: exploiting the alkalinity of the reaction medium and catalyst basicity

2016 ◽  
Vol 5 (4) ◽  
Author(s):  
Erica Daniele da Silva ◽  
Wilma A. Gonzalez ◽  
Marco A. Fraga
Keyword(s):  
Selective Oxidation ◽  
Aqueous Phase ◽  
Reaction Medium ◽  
Phase Oxidation ◽  
Furandicarboxylic Acid

AbstractThe basicity required for the aqueous-phase selective oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid (FDCA) is explored through different approaches. Homogeneous hydroxides were tested along with a Pt/ZrO

scholarly journals Direct catalytic effect of nitrogen functional groups exposed on graphenic materials when acting cooperatively with Ru nanoparticles

RSC Advances ◽  
2017 ◽  
Vol 7 (70) ◽  
pp. 44568-44577 ◽  
Author(s):  
Carolina Ramirez-Barria ◽  
Cristina López-Olmos ◽  
Antonio Guerrero-Ruiz ◽  
Inmaculada Rodríguez-Ramos
Keyword(s):  
Functional Groups ◽  
Aqueous Phase ◽  
Catalytic Effect ◽  
Carbon Materials ◽  
Ru Nanoparticles ◽  
Phase Oxidation ◽  
Furandicarboxylic Acid ◽  
Catalytic Effects

Various carbon materials (including doped graphenic materials) have been used as supports of Ru nanoparticles to determine their catalytic effects in the base-free aqueous-phase oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid.

scholarly journals Pd/Au Based Catalyst Immobilization in Polymeric Nanofibrous Membranes via Electrospinning for the Selective Oxidation of 5-Hydroxymethylfurfural

Processes ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 45 ◽  
Author(s):  
Danilo Bonincontro ◽  
Francesco Fraschetti ◽  
Claire Squarzoni ◽  
Laura Mazzocchetti ◽  
Emanuele Maccaferri ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Large Scale ◽  
Catalytic Performance ◽  
High Yield ◽  
Key Factors ◽  
Hydroxymethyl Furfural ◽  
Catalyst Immobilization ◽  
Polymeric Component ◽  
Furandicarboxylic Acid ◽  
Nanofibrous Membranes

Innovative nanofibrous membranes based on Pd/Au catalysts immobilized via electrospinning onto different polymers were engineered and tested in the selective oxidation of 5-(hydroxymethyl)furfural in an aqueous phase. The type of polymer and the method used to insert the active phases in the membrane were demonstrated to have a significant effect on catalytic performance. The hydrophilicity and the glass transition temperature of the polymeric component are key factors for producing active and selective materials. Nylon-based membranes loaded with unsupported metal nanoparticles were demonstrated to be more efficient than polyacrylonitrile-based membranes, displaying good stability and leading to high yield in 2,5-furandicarboxylic acid. These results underline the promising potential of large-scale applications of electrospinning for the preparation of catalytic nanofibrous membranes to be used in processes for the conversion of renewable molecules.

Selective Oxidation of 5‐Hydroxymethylfurfural to 2,5‐Furandicarboxylic Acid over MnO x ‐CeO 2 Supported Palladium Nanocatalyst under Aqueous Conditions

2020 ◽  
Vol 5 (32) ◽  
pp. 10156-10162
Author(s):  
Changhao Yan ◽  
Hongyao Song ◽  
Yunlei Zhang ◽  
Yanan Wei ◽  
Kai Wang ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Supported Palladium ◽  
Furandicarboxylic Acid ◽  
Aqueous Conditions

scholarly journals The formation of nitro-aromatic compounds under high NO<sub><i>x</i></sub> and anthropogenic VOC conditions in urban Beijing, China

2019 ◽  
Vol 19 (11) ◽  
pp. 7649-7665 ◽  
Author(s):  
Yujue Wang ◽  
Min Hu ◽  
Yuchen Wang ◽  
Jing Zheng ◽  
Dongjie Shang ◽  
...  
Keyword(s):  
Aqueous Phase ◽  
Aromatic Compounds ◽  
Total Concentration ◽  
Fine Particulate Matter ◽  
Oxidation Products ◽  
Urban Atmosphere ◽  
Formation Pathway ◽  
Relative Contribution ◽  
Phase Oxidation ◽  
Nitro Aromatic

Abstract. Nitro-aromatic compounds (NACs), as important contributors to the light absorption by brown carbon, have been widely observed in various ambient atmospheres; however, their formation in the urban atmosphere was little studied. In this work, we report an intensive field study of NACs in summer 2016 at an urban Beijing site, characterized by both high-NOx and anthropogenic VOC dominated conditions. We investigated the factors that influence NAC formation (e.g., NO2, VOC precursors, RH and photolysis) through quantification of eight NACs, along with major components in fine particulate matter, selected volatile organic compounds, and gases. The average total concentration of the quantified NACs was 6.63 ng m−3, higher than those reported in other summertime studies (0.14–6.44 ng m−3). 4-Nitrophenol (4NP, 32.4 %) and 4-nitrocatechol (4NC, 28.5 %) were the top two most abundant NACs, followed by methyl-nitrocatechol (MNC), methyl-nitrophenol (MNP), and dimethyl-nitrophenol (DMNP). The oxidation of toluene and benzene in the presence of NOx was found to be a more dominant source of NACs than primary biomass burning emissions. The NO2 concentration level was found to be an important factor influencing the secondary formation of NACs. A transition from low- to high-NOx regimes coincided with a shift from organic- to inorganic-dominated oxidation products. The transition thresholds were NO2 ∼ 20 ppb for daytime and NO2∼25 ppb for nighttime conditions. Under low-NOx conditions, NACs increased with NO2, while the NO3- concentrations and (NO3-)/NACs ratios were lower, implying organic-dominated products. Under high-NOx conditions, NAC concentrations did not further increase with NO2, while the NO3- concentrations and (NO3-)/NACs ratios showed increasing trends, signaling a shift from organic- to inorganic-dominated products. Nighttime enhancements were observed for 3M4NC and 4M5NC, while daytime enhancements were noted for 4NP, 2M4NP, and DMNP, indicating different formation pathways for these two groups of NACs. Our analysis suggested that the aqueous-phase oxidation was likely the major formation pathway of 4M5NC and 3M5NC, while photo-oxidation of toluene and benzene in the presence of NO2 could be more important for the formation of nitrophenol and its derivatives. Using the (3M4NC+4M5NC) ∕ 4NP ratios as an indicator of the relative contribution of aqueous-phase and gas-phase oxidation pathways to NAC formation, we observed that the relative contribution of aqueous-phase pathways increased at elevated ambient RH and remained constant at RH > 30 %. We also found that the concentrations of VOC precursors (e.g., toluene and benzene) and aerosol surface area acted as important factors in promoting NAC formation, and photolysis as an important loss pathway for nitrophenols.

Aqueous phase oxidation of sulfites by ozone in the presence of iron and manganese

1982 ◽  
Vol 16 (5) ◽  
pp. 1039-1041 ◽  
Author(s):  
Halstead Harrison ◽  
Timothy V. Larson ◽  
Carol Smith Monkman
Keyword(s):  
Aqueous Phase ◽  
Phase Oxidation ◽  
Iron And Manganese
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