Hidden porous boron nitride as a high-efficiency membrane for hydrogen purification

2020 ◽  
Vol 22 (39) ◽  
pp. 22778-22784
Author(s):  
Shuyi Lin ◽  
Meiling Xu ◽  
Ziyang Qu ◽  
Yiwei Liang ◽  
Yan Li ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Mechanical Strength ◽  
High Efficiency ◽  
Hydrogen Purification ◽  
Excellent Selectivity

A predicted atom-thick porous h′-BN monolayer which possesses excellent selectivity, permeability and mechanical strength for hydrogen purification.

scholarly journals A Review of Hydrogen Purification Technologies for Fuel Cell Vehicles

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 393
Author(s):  
Zhemin Du ◽  
Congmin Liu ◽  
Junxiang Zhai ◽  
Xiuying Guo ◽  
Yalin Xiong ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Carbon Emission ◽  
High Efficiency ◽  
Impurity Content ◽  
Fuel Cell Vehicle ◽  
Research Progress ◽  
Hydrogen Purification ◽  
Fuel Cell Vehicles ◽  
Low Carbon

Nowadays, we face a series of global challenges, including the growing depletion of fossil energy, environmental pollution, and global warming. The replacement of coal, petroleum, and natural gas by secondary energy resources is vital for sustainable development. Hydrogen (H2) energy is considered the ultimate energy in the 21st century because of its diverse sources, cleanliness, low carbon emission, flexibility, and high efficiency. H2 fuel cell vehicles are commonly the end-point application of H2 energy. Owing to their zero carbon emission, they are gradually replacing traditional vehicles powered by fossil fuel. As the H2 fuel cell vehicle industry rapidly develops, H2 fuel supply, especially H2 quality, attracts increasing attention. Compared with H2 for industrial use, the H2 purity requirements for fuel cells are not high. Still, the impurity content is strictly controlled since even a low amount of some impurities may irreversibly damage fuel cells’ performance and running life. This paper reviews different versions of current standards concerning H2 for fuel cell vehicles in China and abroad. Furthermore, we analyze the causes and developing trends for the changes in these standards in detail. On the other hand, according to characteristics of H2 for fuel cell vehicles, standard H2 purification technologies, such as pressure swing adsorption (PSA), membrane separation and metal hydride separation, were analyzed, and the latest research progress was reviewed.

High yield and greener C–H difluoromethylation reactions using copper iodide nanoparticles/boron nitride nanosheets as a versatile and recyclable heterogeneous catalyst

2021 ◽  
Author(s):  
Udayakumar Veerabagu ◽  
Gowsika Jaikumar ◽  
Fushen Lu ◽  
Franck Quero
Keyword(s):  
Boron Nitride ◽  
Heterogeneous Catalyst ◽  
High Efficiency ◽  
High Yield ◽  
Copper Iodide ◽  
Boron Nitride Nanosheets ◽  
Greener Synthesis ◽  
High Yields ◽  
Recyclable Heterogeneous Catalyst

The 3 wt% CuI/BNNS catalyst exhibited high efficiency for C–H difluoromethylation reactions and enabled greener synthesis at high yields using cyrene as a solvent. Furthermore, the catalyst could be easily recovered and recycled for at least five cycles.

INVESTIGATION ON MECHANICAL PROPERTIES AND MICROSTRUCTURE OF BORON NITRIDE NANOPARTICLE REINFORCED ALUMINUM-BASED COMPOSITES

2021 ◽  
Vol 16 (3) ◽  
pp. 112-123
Author(s):  
Mahmut Can Şenel ◽  
Mevlüt Gürbüz
Keyword(s):  
Compressive Strength ◽  
Boron Nitride ◽  
Mechanical Strength ◽  
Matrix Composite ◽  
Vickers Hardness ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composite ◽  
Matrix Composites ◽  
Al Matrix Composites ◽  
Al Matrix

In the current work, nano boron nitride (BN) reinforced aluminum (Al) matrix composites with different BN amounts (0.5-2wt.%) were produced by the powder metallurgy(PM) route. This fabrication method consists of dispersing, filtering, mixing, drying, compaction, and sintering processes. The density, compressive strength, micro Vickers hardness, microstructure, and phase structures of Al-BN composites and pure Al were examined. The obtained results indicated that minimum porosity (3.2%), highest density (~2.61g/cm3), Vickers hardness (~50HV), and compressive strength (~168MPa) were obtained at 1%BN reinforced aluminum matrix composite. A tremendous enhancement in Vickers hardness and compressive strength of %1BN reinforced Al matrix composite was achieved as ~61% and ~110% compared to pure Al. Consequently, the mechanical strength of BN reinforced Al-based composites enhanced up to 1% nano boron nitride amount. Due to the clumping of BN nanoparticles, the mechanical strength decreased after this content.

scholarly journals High efficiency hexagonal boron nitride neutron detectors with 1 cm2 detection areas

2020 ◽  
Vol 116 (14) ◽  
pp. 142102 ◽  
Author(s):  
A. Maity ◽  
S. J. Grenadier ◽  
J. Li ◽  
J. Y. Lin ◽  
H. X. Jiang
Keyword(s):  
Boron Nitride ◽  
High Efficiency ◽  
Hexagonal Boron Nitride ◽  
Neutron Detectors

Scalable production of high-quality boron nitride nanosheets via a recyclable salt-templating method

2019 ◽  
Vol 21 (24) ◽  
pp. 6746-6753 ◽  
Author(s):  
Yancui Xu ◽  
Taotao Li ◽  
Weiwei Xu ◽  
Chaowei Li ◽  
Songfeng E ◽  
...  
Keyword(s):  
Boron Nitride ◽  
High Efficiency ◽  
High Quality ◽  
Templating Method ◽  
Boron Nitride Nanosheets ◽  
Boron Nitride Nanosheet ◽  
Scalable Production

Hollow-structured boron nitride nanosheet cubes were produced via a recyclable salt-templating method, which leads to a high efficiency up to 88.4% on a gram scale.

scholarly journals Highly Selective Synthesis of Chlorophenols under Microwave Irradiation

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Yawen Xiong ◽  
Hongdong Duan ◽  
Xia Meng ◽  
Zhaoyun Ding ◽  
Weichun Feng
Keyword(s):  
Reaction Mechanism ◽  
Reaction Time ◽  
Hydrochloric Acid ◽  
Microwave Irradiation ◽  
High Efficiency ◽  
Selective Synthesis ◽  
Conversion Rates ◽  
Electron Donating Groups ◽  
Electron Transfers ◽  
Excellent Selectivity

Oxychlorination of various phenols is finished in 60 minutes with high efficiency and perfect selectivity under microwave irradiation. These reactions adopt copper(II) chloride (CuCl2) as the catalyst and hydrochloric acid as chlorine source instead of expensive and toxic ones. Oxychlorination of phenols substituted with electron donating groups (methyl, methoxyl, isopropyl, etc.) atortho-andmeta-positions is accomplished with higher conversion rates, lower reaction time, and excellent selectivity. A proposed reaction mechanism is deduced; one electron transfers from CuCl2to phenol followed by the formation of tautomeric radical that can be rapidly captured by chlorine atom and converts intopara-substituted product.

Mechanical strength of boron nitride nanotube-polymer interfaces

2015 ◽  
Vol 107 (25) ◽  
pp. 253105 ◽  
Author(s):  
Xiaoming Chen ◽  
Liuyang Zhang ◽  
Cheol Park ◽  
Catharine C. Fay ◽  
Xianqiao Wang ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Mechanical Strength ◽  
Polymer Interfaces ◽  
Boron Nitride Nanotube

scholarly journals Mechanical strength and tribological behavior of ion-beam-deposited boron nitride films on non-metallic substrates

1987 ◽  
Vol 33 ◽  
pp. 221-233 ◽  
Author(s):  
Kazuhisa Miyoshi ◽  
Donald H. Buckley ◽  
John J. Pouch ◽  
Samuel A. Alterovitz ◽  
Harold E. Sliney
Keyword(s):  
Boron Nitride ◽  
Mechanical Strength ◽  
Tribological Behavior ◽  
Ion Beam ◽  
Metallic Substrates ◽  
Boron Nitride Films
Sign in / Sign up

Export Citation Format

Share Document