Controllable Encapsulation of Silver Nanoparticles by Porous Pyridine-Based Covalent Organic Frameworks for Efficient CO2 Conversion Using Propargylic Amines

2021 ◽  
Author(s):  
Yize Zhang ◽  
Xingwang Lan ◽  
Fanyong Yan ◽  
Xingyue He ◽  
Juan Wang ◽  
...  

Conversion of CO2 into value-added chemicals is an attractive alternative to produce valuable fuels and chemicals. In this work, we demonstrate two pyridine-based covalent organic frameworks (COFs) with rich porosity...

2021 ◽  
Author(s):  
Xingxing Tan ◽  
Xiaofu Sun ◽  
Buxing Han

Abstract CO2 is an abundant and renewable C1 feedstock. Electrochemical transformation of CO2 can integrate CO2 fixation with renewable electricity storage, providing an avenue to close the anthropogenic carbon cycle. As a new type of green and chemically tailorable solvents, ionic liquids (ILs) have been proposed as the highly promising alternatives for conventional electrolytes in electrochemical CO2 conversion. This review summarizes major advances in the electrochemical transformation of CO2 into value-added carbonic fuels and chemicals in IL-based media in the past several years. Both the direct CO2 electroreduction (CO2ER) and CO2-involved electroorganic transformation (CO2EOT) are discussed, focusing on the effect of electrocatalysts, IL components, reactor configurations, and operating conditions on the catalytic activity, selectivity, and reusability. The reasons for the enhanced CO2 conversion performance by ILs are also discussed, which provides guidance for the rational design of novel IL-based electrochemical processes for CO2 conversion. Finally, the critical challenges remaining in this research area and promising directions for future research are proposed.


2020 ◽  
Author(s):  
Jesús David Coral Medina ◽  
Antonio Irineudo Magalhaes Jr

Currently, the continuous depletion of non-renewable resources of fuels and chemicals has promoted the research and development of different alternatives for the replacement of fossil resources as the feedstock of fuels and chemicals. At present, one of the most important biofuels in the current economy, is bioethanol, contributing to 65% of the total biofuels production. The production of bioethanol is an attractive alternative because it would be produced using indigenous and native raw material, therefore, the socioeconomic impact mainly in developing countries would be measured by the economic incomes and increase the quality of life of small and middle farmers. The first-generation ethanol production from sugarcane, corn, or beet sugar is broadly implemented at an industrial scale. However, the second-generation ethanol (2GE) is currently still in development stages, looking for different alternatives according to each region under study. The 2GE is also subject of diverse opinions about its economic viability and its real impact on the environment, especially due to the CO2 footprint. Consequently, this chapter has presented an overview of 2GE production, the possibilities of co-production of molecules of high value-added, and their economic and environmental assessment, including CO2 release, water consumption, solid residues disposal, and economic analysis to determine the best bioethanol based biorefinery configuration.


2021 ◽  
Author(s):  
Sourav Ghosh ◽  
Arindam Modak ◽  
Arnab Samanta ◽  
Kanika Kole ◽  
Subhra Jana

A comprehensive and critical in-depth discussion on the development and prospect of several advanced materials for conversion of CO2 to value added chemicals is provided, together with their current status, technical feasibility and future opportunities.


Processes ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 23
Author(s):  
Wenli Wang ◽  
Yichen Liu ◽  
Yue Wang ◽  
Longfei Liu ◽  
Changwei Hu

The thermal degradation of lignin for value-added fuels and chemicals is important for environment improvement and sustainable development. The impact of pretreatment and catalysis of Ni(NO3)2 on the pyrolysis behavior of organsolv lignin were studied in the present work. Samples were pyrolyzed at 500 ∘C with an upward fixed bed, and the characteristics of bio-oil were determined. After pretreatment by Ni(NO3)2, the yield of monophenols increased from 23.3 wt.% to 30.2 wt.% in “Ni-washed” and decreased slightly from 23.3 wt.% to 20.3 wt.% in “Ni-unwashed”. Meanwhile, the selective formation of vinyl-monophenols was promoted in “Ni-unwashed”, which indicated that the existence of nickel species promoted the dehydration of C-OH and breakage of C-C in pyrolysis. In comparison with “Water”, HHV of bio-oil derived from “Ni-unwashed” slightly increased from 27.94 mJ/kg to 28.46 mJ/kg, suggesting that the lowering of oxygen content in bio-oil is associated with improved quality. Furthermore, the content of H2 in gas products dramatically increased from 2.0% to 7.6% and 17.1%, respectively.


2017 ◽  
Vol 46 (19) ◽  
pp. 5805-5863 ◽  
Author(s):  
Ramses Snoeckx ◽  
Annemie Bogaerts

Plasma technology as a potential breakthrough technology for the economic conversion of CO2 into value-added chemicals and fuels.


2010 ◽  
Vol 3 (7) ◽  
pp. 884 ◽  
Author(s):  
Robert W. Dorner ◽  
Dennis R. Hardy ◽  
Frederick W. Williams ◽  
Heather D. Willauer

Chemistry ◽  
2021 ◽  
Vol 3 (4) ◽  
pp. 1271-1285
Author(s):  
Patricia Zimet ◽  
Ruby Valadez ◽  
Sofía Raffaelli ◽  
María Belén Estevez ◽  
Helena Pardo ◽  
...  

Microbial technology offers a green alternative for the synthesis of value-added nanomaterials. In particular, fungal compounds can improve silver nanoparticle production, stabilizing colloidal nanoparticles. Based on a previous study by our group, silver nanoparticles obtained using the extracellular cell-free extracts of Phanerochaete chrysosporium (PchNPs) have shown antimicrobial and antibiofilm activity against Gram-negative bacteria. Moreover, nisin—a bacteriocin widely used as a natural food preservative—has recently gained much attention due its antimicrobial action against Gram-positive bacteria in biomedical applications. Therefore, the aim of this work was to conjugate biogenic silver nanoparticles (PchNPs) with nisin to obtain nanoconjugates (PchNPs@nis) with enhanced antimicrobial properties. Characterization assays were conducted to determine physicochemical properties of PchNPs@nis, and also their antibacterial and antibiofilm activities were studied. The formation of PchNPs@nis was confirmed by UV-Vis, TEM, and Raman spectroscopy analysis. Different PchNPs@nis nanobioconjugates showed diameter values in the range of 60–130 nm by DLS and surface charge values between −20 and −13 mV. Nisin showed an excellent affinity to PchNPs, with binding efficiencies higher than 75%. Stable synthesized PchNPs@nis nanobioconjugates were not only able to inhibit biofilm formation by S. aureus, but also showed inhibition of the planktonic cell growth of Staphyloccocus aureus and Escherichia coli, broadening the spectrum of action of the unconjugated antimicrobials against Gram-positive and Gram-negative bacteria. In conclusion, these results show the promising application of PchNPs@nis, prepared via green technology, as potential antimicrobial nanomaterials.


Catalysts ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1113
Author(s):  
Hanyu Cong ◽  
Haibo Yuan ◽  
Zekun Tao ◽  
Hanlin Bao ◽  
Zheming Zhang ◽  
...  

Converting biomass into high value-added compounds has attracted great attention for solving fossil fuel consumption and global warming. 5-Hydroxymethylfurfural (HMF) has been considered as a versatile biomass-derived building block that can be used to synthesize a variety of sustainable fuels and chemicals. Among these derivatives, 2,5-furandicarboxylic acid (FDCA) is a desirable alternative to petroleum-derived terephthalic acid for the synthesis of biodegradable polyesters. Herein, to fully understand the current development of the catalytic conversion of biomass to FDCA, a comprehensive review of the catalytic conversion of cellulose biomass to HMF and the oxidation of HMF to FDCA is presented. Moreover, future research directions and general trends of using biomass for FDCA production are also proposed.


2020 ◽  
Vol 4 (11) ◽  
pp. 5568-5577
Author(s):  
M. A. Khan ◽  
Tareq A. Al-Attas ◽  
Nael G. Yasri ◽  
Heng Zhao ◽  
Stephen Larter ◽  
...  

Techno-economic analysis of sunlight-driven electrochemical conversion of glucose to fuels and chemicals i.e., hydrogen, gluconic acid and glucaric acid.


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