scholarly journals Developing two-dimensional solid superacids with enhanced mass transport, extremely high acid strength and superior catalytic performance

2019 ◽  
Vol 10 (23) ◽  
pp. 5875-5883 ◽  
Author(s):  
Fujian Liu ◽  
Xianfeng Yi ◽  
Wei Chen ◽  
Zhiqiang Liu ◽  
Wei Chen ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Mass Transport ◽  
Biomass Conversion ◽  
Catalytic Performance ◽  
Acid Strength ◽  
Two Dimensional ◽  
Solid Superacids ◽  
High Acid ◽  
Transfer Properties

2D hybrid solid superacids with extremely high acid strength and outstanding mass transfer properties were prepared and exhibit superior activities for biomass conversion.

Rational design and preparation of hierarchical monoliths through 3D printing for syngas methanation

2018 ◽  
Vol 6 (14) ◽  
pp. 5695-5702 ◽  
Author(s):  
Yunhua Li ◽  
Sijing Chen ◽  
Xiaohu Cai ◽  
Jinqing Hong ◽  
Xuee Wu ◽  
...  
Keyword(s):  
Mass Transfer ◽  
3D Printing ◽  
Heat Mass Transfer ◽  
Rational Design ◽  
High Heat ◽  
Catalytic Performance ◽  
Micro Channels ◽  
Transfer Properties ◽  
Excellent Catalytic Performance

Hierarchical monolith with controllable precise micro-channels from 3D printing shows high heat/mass transfer properties companied by excellent catalytic performance.

scholarly journals Efficient Electrocatalytic Upgrading of Furan-Based Biomass: Key Roles of Two-Dimensional Mesoporous Heterostructure and Ternary Electrolyte

2021 ◽  
Author(s):  
Haoran Wu ◽  
Yashi Zou ◽  
Haishan Xu ◽  
Jianming Yang ◽  
Qinye Bao ◽  
...  
Keyword(s):  
High Performance ◽  
Biomass Conversion ◽  
Value Added ◽  
Mesoporous Structure ◽  
Catalytic Performance ◽  
Active Species ◽  
Heterocyclic Carbenes ◽  
Two Dimensional ◽  
Mechanism Study ◽  
Efficient Conversion

Abstract Development of high-performance electrocatalytic systems for efficient conversion of biomass to value-added chemicals under mild conditions and understanding of their mechanisms are of profound significance, but have remained a great challenge. Here, we report the first development of two-dimensional mesoporous electrocatalyst for biomass conversion. The electrocatalyst (meso-PA/PmPD/GO) consists of phytic acid (PA)-doped mesoporous poly(m-phenylenediamine) layers coated on graphene oxide nanosheets. Meanwhile, a high-performance ternary electrolyte containing 1-butyl-3-methylimidazolium tetrafluoroborate (BmimBF4), acetonitrile and H2O is developed. The combination of meso-PA/PmPD/GO and the ternary electrolyte realizes highly efficient conversion of two important biomass derivatives at room temperature. One involves a hardly achieved oxidation of furfuryl alcohol to 6-hydroxy-2,3-dihydro-6H-pyrano-3-one with high faradic efficiency (FE: 83.7%) and selectivity (87.9%). The other involves the oxidation of furfural to 5-hydroxy-2(5H)-furanone with record-high FE (98.9%) and selectivity (93.6%). Mechanism study including DFT calculations unveils that N-heterocyclic carbenes (Bmim*) generated from BmimBF4 act as the reaction-determining active species. Additionally, the synergistic effect of the PA doping, mesoporous structure and p-n heterojunction interface in meso-PA/PmPD/GO favors the mass transport and the transfer of generated holes to the outer layers, thus boosting the catalytic performance.

Efficient Production of Biodiesel Catalyzed by Acidic Nanoporous Carbon Materials：A Review

2020 ◽  
Vol 16 ◽  
Author(s):  
Anping Wang ◽  
Heng Zhang ◽  
Hu Li ◽  
Song Yang
Keyword(s):  
Pore Structure ◽  
Active Sites ◽  
Catalytic Performance ◽  
Nanoporous Carbon ◽  
Biodiesel Production ◽  
Efficient Production ◽  
Fossil Energy ◽  
Catalytic Materials ◽  
High Acid ◽  
Carbon Based

Background: With the gradual decrease of fossil energy, the development of alternatives to fossil energy has attracted more and more attention. Biodiesel is considered to be the most potent alternative to fossil energy, mainly due to its green, renewable and biodegradable advantages. The stable, efficient and reusable catalysts are undoubtedly the most critical in the preparation of biodiesel. Among them, nanoporous carbon-based acidic materials are very important biodiesel catalysts. Objective: The latest advances of acidic nanoporous carbon catalysts in biodiesel production was reviewed. Methods: Biodiesel is mainly synthesized by esterification and transesterification. Due to the important role of nanoporous carbon-based acidic materials in the catalytic preparation of biodiesel, we focused on the synthesis, physical and chemical properties, catalytic performance and reusability. Results: Acidic catalytic materials have a good catalytic performance for high acid value feedstocks. However, the preparation of biodiesel with acid catalyst requires relatively strict reaction conditions. The application of nanoporous acidic carbon-based materials, due to the support of carbon-based framework, makes the catalyst have good stability and unique pore structure, accelerates the reaction mass transfer speed and accelerates the reaction. Conclusion: Nanoporous carbon-based acidic catalysts have the advantages of suitable pore structure, high active sites, and high stability. In order to make these catalytic processes more efficient, environmentally friendly and low cost, it is an important research direction for the future biodiesel catalysts to develop new catalytic materials with high specific surface area, suitable pore size, high acid density, and excellent performance.

scholarly journals Investigating the Proton and Ion Transfer Properties of Supported Ionic Liquid Membranes Prepared for Bioelectrochemical Applications Using Hydrophobic Imidazolium-Type Ionic Liquids

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 359
Author(s):  
László Koók ◽  
Piroska Lajtai-Szabó ◽  
Péter Bakonyi ◽  
Katalin Bélafi-Bakó ◽  
Nándor Nemestóthy
Keyword(s):  
Mass Transfer ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Microbial Fuel Cells ◽  
Transport Numbers ◽  
Liquid Membranes ◽  
Ion Transfer ◽  
Supported Ionic Liquid ◽  
Supported Ionic Liquid Membranes ◽  
Transfer Properties

Hydrophobic ionic liquids (IL) may offer a special electrolyte in the form of supported ionic liquid membranes (SILM) for microbial fuel cells (MFC) due to their advantageous mass transfer characteristics. In this work, the proton and ion transfer properties of SILMs made with IL containing imidazolium cation and [PF6]− and [NTf2]− anions were studied and compared to Nafion. It resulted that both ILs show better proton mass transfer and diffusion coefficient than Nafion. The data implied the presence of water microclusters permeating through [hmim][PF6]-SILM to assist the proton transfer. This mechanism could not be assumed in the case of [NTf2]− containing IL. Ion transport numbers of K+, Na+, and H+ showed that the IL with [PF6]− anion could be beneficial in terms of reducing ion transfer losses in MFCs. Moreover, the conductivity of [bmim][PF6]-SILM at low electrolyte concentration (such as in MFCs) was comparable to Nafion.

scholarly journals A high accurate scheme for numerical simulation of two-dimensional mass transfer processes in food engineering

2021 ◽  
Vol 60 (2) ◽  
pp. 2629-2639
Author(s):  
Yin Yang ◽  
Grzegorz Rządkowski ◽  
Atena Pasban ◽  
Emran Tohidi ◽  
Stanford Shateyi
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Two Dimensional ◽  
Food Engineering ◽  
Transfer Processes ◽  
Mass Transfer Processes ◽  
Accurate Scheme
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