Aluminum nanoparticles manufactured using a ball-milling method with ammonium chloride as a grinding aid: achieving energy release at low temperature

2019 ◽  
Vol 43 (4) ◽  
pp. 1851-1856 ◽  
Author(s):  
Aifeng Jiang ◽  
Fang Wang ◽  
Debin Xia ◽  
Mengru Li ◽  
Liangsheng Qiang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Energy Release ◽  
Ball Milling ◽  
Ammonium Chloride ◽  
Aluminum Nanoparticles ◽  
Rapid Combustion ◽  
Milling Method ◽  
Excellent Stability

Aluminum nanoparticles were produced on a hundred-gram scale using a facile method and presented excellent stability, low oxidation initiation temperatures, and rapid combustion.

scholarly journals Preparation of Pd/SiO2 Catalysts by a Simple Dry Ball-Milling Method for Lean Methane Oxidation and Probe of the State of Active Pd Species

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 725
Author(s):  
Li Yang ◽  
Chao Fan ◽  
Li Luo ◽  
Yanyan Chen ◽  
Zhiwei Wu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Low Temperature ◽  
Ball Milling ◽  
Methane Oxidation ◽  
Oxidation State ◽  
Catalytic Performance ◽  
The State ◽  
Pd Catalysts ◽  
Tight Contact ◽  
Milling Method

A series of Pd/SiO2 catalysts were prepared with different Pd precursors by a dry ball-milling method and used in the catalytic oxidation of lean methane at low temperature. The effect of Pd precursors on the catalytic performance was investigated and the state of the most active Pd species was probed. The results indicate that dry ball-milling is a simple but rather effective method to prepare the Pd/SiO2 catalysts for lean methane oxidation, and palladium acetylacetonate is an ideal precursor to obtain a highly active Pd/SiO2-Acac catalyst with well- and stably dispersed Pd species, owing to the tight contact between acetylacetonate and Si–OH on the SiO2 support. Besides the size and dispersion of Pd particles, the oxidation state of Pd species also plays a crucial role in determining the catalytic activity of Pd/SiO2 in lean methane oxidation at low temperature. A non-monotonic dependence of the catalytic activity on the Pd oxidation state is observed. The activity of various Pd species follows the order of PdOx >> Pd > PdO; the PdOx/SiO2-Acac catalysts (in particular for PdO0.82/SiO2-Acac when x = 0.82) exhibit much higher activity in lean methane oxidation at low temperature than Pd/SiO2-Acac and PdO/SiO2-Acac. The catalytic activity of PdOx/SiO2 may degrade during the methane oxidation due to the gradual transformation of PdOx to PdO in the oxygen-rich ambiance; however, such degradation is reversible and the activity of a degraded Pd/SiO2 catalyst can be recovered through a redox treatment to regain the PdOx species. This work helps to foster a better understanding of the relationship between the structure and performance of supported Pd catalysts by clarifying the state of active Pd species, which should be beneficial to the design of an active catalyst in lean methane oxidation at low temperature.

Low-temperature synthesis of Mg4Nb2O9 nanopowders by high-energy ball-milling method

2010 ◽  
Vol 493 (1-2) ◽  
pp. 441-444 ◽  
Author(s):  
Zhi-Fen Fu ◽  
Peng Liu ◽  
Xiao-Ming Chen ◽  
Jian-Li Ma ◽  
Huai-Wu Zhang
Keyword(s):  
Low Temperature ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Milling Method ◽  
Energy Ball

Facile low temperature solid state synthesis of iodoapatite by high-energy ball milling

RSC Advances ◽  
2014 ◽  
Vol 4 (73) ◽  
pp. 38718-38725 ◽  
Author(s):  
Fengyuan Lu ◽  
Tiankai Yao ◽  
Jinling Xu ◽  
Jingxian Wang ◽  
Spencer Scott ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Solid State ◽  
Low Temperature ◽  
Ball Milling ◽  
Thermal Annealing ◽  
Amorphous Matrix ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Solid State Synthesis ◽  
Energy Ball

High energy ball milled iodoapatite in the form of an amorphous matrix embedded with nanocrystals can be readily crystallized by subsequent low temperature thermal annealing, which greatly improves the thermal stability and iodine confinement.

Ball milling method encapsulated α-Fe2O3 into g-C3N4 as efficient and stable photo-catalysts

2021 ◽  
Author(s):  
Huijuan Shao ◽  
Peng Yao ◽  
Yi Chen ◽  
Yue Yao ◽  
Guangbi Li ◽  
...  
Keyword(s):  
Ball Milling ◽  
Hydrothermal Method ◽  
Photocatalytic Ability ◽  
Milling Method

α-Fe2O3/g-C3N4, is attributed to a Z-scheme structure, and with excellent photocatalytic ability. But this composites were prepared by conventional, the calcination/hydrothermal method. Above two methods are time-consuming and high cost...

Synthesis of TiO2-Carbon Nanotubes through ball-milling method for mineralization of oxamic acid (OMA) by photocatalytic ozonation

2017 ◽  
Vol 5 (6) ◽  
pp. 5599-5607 ◽  
Author(s):  
Carla A. Orge ◽  
O. Salomé G.P. Soares ◽  
Joaquim L. Faria ◽  
M. Fernando R. Pereira
Keyword(s):  
Carbon Nanotubes ◽  
Ball Milling ◽  
Photocatalytic Ozonation ◽  
Milling Method

Effect of High-Energy Ball Milling on Microstructure and Microwave Absorbing Properties of NdFe Material

2011 ◽  
Vol 311-313 ◽  
pp. 1281-1285 ◽  
Author(s):  
Pei Hao Lin ◽  
Lei Wang ◽  
Shun Kang Pan ◽  
Hua Mei Wan
Keyword(s):  
Ball Milling ◽  
Particle Morphology ◽  
High Energy ◽  
High Energy Ball Milling ◽  
X Ray ◽  
Microwave Absorbing Properties ◽  
Absorbing Materials ◽  
Milling Method ◽  
Energy Ball ◽  
Microwave Absorbing

The NdFe magnetic absorbing materials were prepared by rapid solidification and high-energy ball milling method. The effect of high-energy ball milling on particle morphology, organizational structure and microwave absorbing properties of NdFe magnetic absorbing materials were analyzed with the aid of X-ray diffractometer, scanning electron microscope and vector network analysis. The results show that the Nd2Fe17 and α-Fe phase are refined, the particles become smaller and thinner; the span-ratio of the particles increases along with time during the process of high-energy ball milling; and meanwhile, the frequency of absorbing peak reduces. The absorbing bandwidth broadens as the increase of the time of ball milling, except that of 48h.The minimum reflectance of the powder decreases from -22dB to - 44dB under the circumstances that the time of high energy ball milling reaches 48h and the thickness of the microwave absorbing coating is 1.5mm. But it rebounds to about - 6dB when the time of ball milling reaches 72h.

Combustion control and operating range expansion in an homogeneous charge compression ignition engine with direct in-cylinder injection of reaction inhibitors

2005 ◽  
Vol 6 (4) ◽  
pp. 341-359 ◽  
Author(s):  
H Ogawa ◽  
N Miyamoto ◽  
N Kaneko ◽  
H Ando
Keyword(s):  
Low Temperature ◽  
Homogeneous Charge Compression Ignition ◽  
Water Injection ◽  
Combustion Efficiency ◽  
Compression Ignition ◽  
Low Temperature Oxidation ◽  
Temperature Oxidation ◽  
Operating Range ◽  
Rapid Combustion ◽  
Charge Temperature

Light naphtha, which exhibits two-stage ignition, was induced from the intake manifold and water or a low-ignitability fuel, which does not exhibit low temperature oxidation, was directly injected early in the compression stroke for ignition suppression in an homogeneous charge compression ignition (HCCI) engine. Their quantitative balance was flexibly controlled to optimize ignition timing according to operating conditions. Ultra-low NOx and smokeless combustion without knocking or misfiring was realized over a wide operating range with water or alcohol injection. The water injection significantly reduced the low-temperature oxidation, which suppressed the increase in charge temperature and the rapid combustion caused by the high-temperature oxidation. Rapid combustion was suppressed by reductions in the maximum in-cylinder gas temperature due to water injection while the combustion efficiency suffered. Therefore, the maximum charge temperature needs to be controlled within an extremely limited range to maintain a satisfactory compromise between mild combustion and high combustion efficiency. Alcohols inhibit low-temperature oxidation more strongly than other oxygenated or unoxygenated hydrocarbons, water, and hydrogen. Chemical kinetic modelling with methanol showed a reduction of OH radical before the onset of low-temperature oxidation, and this may be the main mechanism by which alcohols inhibit low-temperature oxidation.

Sign in / Sign up

Export Citation Format

Share Document