： A solvent-free method for the direct oxidation of anilines to the corresponding azo and azoxy homocoupling products by using a planetary ball mill was developed. Various oxidants and grinding auxiliaries were tested and a variety of substituted ...
In situ ball milling of solid catalysts is a promising yet almost unexplored concept for boosting catalytic performance. The continuous preferential oxidation of CO (CO‐PROX) under in situ ball milling of Cu‐based catalysts such as Cu/Cr 2 O 3 is presented. At temperatures as low as −40 °C, considerable activity and more than 95 % selectivity were achieved.
TiO 2 –CeO 2 photocatalysts were synthesized by a high energy ball milling process at different milling speed and their photocatalytic activities were evaluated by measuring degradation efficiency of methyl orange. Phases, crystal size, microstrain, …
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 ( IF 3.52) Pub Date :, DOI: 10.3390/catal11060725
Effect of Ball Milling and Oxidation on Dispersibility and Dispersion Stability of Multiwalled Carbon Nanotubes in High Viscous Heat Exchange Fluids. Chachin …
After ball milling for 8 h, the mixed powder did not show obvious oxidation. The distribution of titanium and magnesium powders in the mixed powder was relatively uniform, and the mechanical properties of the composites were relatively good, which met the mechanical properties requirements of medical materials.
Combining the ball-milling effect and crystal structure transition, the lattice parameters a and volume cell of Fe 9 TiO 15 crystal deviates gradually from its ideal size (a = 5.0342 Å, V = 301.70 Å 3), which indicates the lattice defects could be introduced by the ball-milling process, thereby accelerating the oxidation process of titanium ...
SHS process parameters by ball milling to prepare highly ordered NiAl-Y powder. • 7YSZ coated NiAl-Y model alloys to evaluate their furnace cyclic oxidation behavior at 1100 °C. • 0.1–0.5 at.%Y reduce the oxidation kinetics to one third of undoped NiAl mass gain. •
Oxidation Guan-Wu Wang, J. Org. Chem. 73, 7088 (2008). 18 Conventional heating in organic solvent: a. Acetic acid, 80oC, argon atmosphere, yield 32% b. Ethanol, refluxing temperature for 12h, yield 48% O R1 O R1 X N + R2 O Mn(OAc) 3.2H 2O ball Omilling 18 examples up to 91% yield X N O O R1 R1 R2 R1=CH X=CH or N 3 R2 = -C 6H 5, -C 6H 5NO 2,-C ...
S1 Supporting Information Ball milling - a new concept for predicting degradation profiles in active pharmaceutical ingredients Reinhard P. Kaisera, Everaldo F. Krakeb, Laura Backerc, Jonas Urlaubc, Wolfgang Baumannb, Norbert Handlerd, Helmut Buschmannd, Torsten Beweries*b, Ulrike Holzgrabe*c, Carsten Bolm*a a RWTH Aachen University, Institute of Organic Chemistry, Landoltweg …
ball milling and thermal oxidation for the fabrication of multiwalled carbon nanotubes. Based on the above discussion, in this article, we present a simple process that uses thermal oxidation of Zn powders in air for the growth of ZnO nanostructures at a quite low temperature (500). The key and novel feature of our process is the addition of small
Oxidation reactions of ilmenite (FeTiO 3) have been investigated during thermal annealing and ball milling processes using X-ray diffraction and thermal analyses.Thermal oxidation reactions consist of a low-temperature (<1000°C) reaction with the formation of intermediate phases (Fe 2 Ti 3 O 9 and Fe 2 O 3) and high-temperature (>1000°C) reactions with the formation of final thermally stable ...
The effect of microwave and mechanochemical ball milling energy inputs was studied for the peroxidative oxidation (with aqueous H 2 O 2) of cyclohexane to cyclohexanol and cyclohexanone, over CoCl 2 and/or V 2 O 5 dispersed (μm scale) catalysts. A maximum total yield of cyclohexanol and cyclohexanone of 43% after 1 h of reaction at 30 °C, in acetonitrile and under microwave irradiation (5 …
In this work, we propose the synthesis of ZnO nanostructures through the thermal oxidation of ball-milled powders with the introduction of Mg and Sn doping species at the preliminary step of milling. We investigate the advantages and challenges of this two steps process for the production and fabrication of highly crystalline ZnO nanowires.
In situ ball milling of solid catalysts is a promising yet almost unexplored concept for boosting catalytic performance. The continuous preferential oxidation of CO (CO-PROX) under in situ ball milling of Cu-based catalysts such as Cu/Cr 2 O 3 is presented. At temperatures as low as −40 °C, considerable activity and more than 95 % selectivity were achieved.
An efficient aerobic chemoselective oxidation of thiols to disulfides has been achieved under ball-milling over neutral aluminium oxide (grinding auxiliary) in the absence of any catalyst, co-oxidant, solvent, or base. A wide variety of functionalized diaryl, diheteroaryl and dialkyl disulfides have been obt
In situ hybrid-reinforced Ti555 titanium matrix composites (TMCs) (TiB + TiC + Ti5Si3) were prepared by low-energy ball milling and discharge plasma sintering using Ti555 titanium alloy powder and B4Cp, SiCp, and CNT as the raw materials, and then solution and aging treatment were performed. The effects of the content and type of reactants on the microstructure, microhardness of phase ...
Although CeO 2-supported Au single atoms (Au 1 /CeO 2) have great potential in preferential oxidation of CO (PROX) reaction, the large-scale synthesis of such single-atom catalysts (SACs) is still greatly challenging.Herein, we develop a dry ball milling method for the mass production of Au 1 /CeO 2 SACs in large quantities (>1 kg). The as-prepared Au 1 /CeO 2 SACs were demonstrated as highly ...
Though molybdenum disulfide (MoS 2) has attracted widely attention in SO 4 •– based advanced oxidation process recently, the effect of ball milling on its catalytic efficiency is less studied. In this work, the purchased MoS 2 was ball milled and applied as peroxymonosulfate (PMS) activator for degradation of tetracycline (TC). ...
The N 2p spectrum of Li 2 S–Li 3 N–C featured peaks at 396 and 398 eV, which were higher binding energies than those of Li 3 N, indicating the oxidation of this compound during ball-milling. However, these peaks were below 400 eV and were therefore ascribed to anionic N.
In this work, we propose the synthesis of ZnO nanostructures through the thermal oxidation of ball-milled powders with the introduction of Mg and Sn doping species at the preliminary step of milling.
In this study, a solvent-free, rapid, and effective oxidation method is proposed. It is based on direct solid-state reaction between chitosan and oxidant powder in a mechanochemical reactor. Results prove that by short high energy ball milling (< 3 h) it is possible to achieve diverse physicochemical modifications employing different reagents.
Oxidation is a major problem for Ball Milling methodology. Cite. 26th Oct, 2015. Nerio Vicente. Serviço Nacional de Aprendizagem Industrial. Titanium can pick up interstitial elements very easly ...