In
order to improve the desulfurization efficiency of 50% Mn
x
O
y
/MCM-48 sorbent,
the preparation parameters including synthesis method (excessive impregnation,
precipitation, and sol–gel), precursor selection (Mn(Ac)2 and Mn(NO3)2), heating rate during
calcination (2°/min, 4°/min, 6°/min, and 8°/min),
and calcination temperature (450 °C, 550 °C, 650 °C,
and 750 °C) of sorbents were investigated systematically. The
structure and composition of different sorbents were characterized
by XRD, BET, TG/DSC, H2-TPR, UV–vis, TPSR, and FT-IR
techniques. The results indicated that synthesis methods and precursors
influenced remarkably the dispersion of active particles while the
stable structure of MCM-48 and the dispersion of active particles
correlated closely with the heating rate during calcination and calcination
temperature of sorbents, which will influence the desulfurization
efficiency of sorbents. Therefore, the better dispersion of active
particles and integrity of MCM-48 structure will result in better
desulfurization performance of sorbents. Thus, the best condition
was the calcination temperature of 550 °C with a heating rate
of 2°/min using Mn(Ac)2 as precursor by a sol–gel
method.
01570 aluminum alloy was cold rolled and annealed at different temperatures, and their microstructure, mechanical properties, pitting and stress corrosion cracking (SCC) behaviors were observed and determined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), immersion test, slow strain rate tensile (SSRT), and constant loading tests. The results reveal that the dislocations within the grains of alloy 01570 are transformed from dislocation tangles to dislocation walls and subgrains as the treatment varies from the cold rolled temper to the annealed tempers; at the same time, the tensile strength and SCC resistance of alloy 01570 are increased and the elongation is decreased, whereas the corrosion rate is negligibly influenced by the annealing treatments. Therefore, the annealed at 300 8C temper can be selected as the optimum heat treatment for the practical application of alloy 01570.
Application of Non-thermal plasma for gas cleaning is gaining prominence in recent years, which can effectively remove NOx and other exhaust gases simultaneously. As the present researches are mostly adopting simulation gas for the investigation, this paper employed the NOx from the actual diesel exhaust as the investigated subject. Effects of the amplitude and frequency of voltage, the diameter of high-voltage electrode, the reactor volume and the discharge gap on NOx removal were studied based on dielectric barrier discharge. Obtained results indicate that, the removal rate of NOx increased first and then decreased with increasing the magnitude and frequency of the voltage. With decreasing discharge gap, the removal rate of NOx increased. With increasing the volume of reactor and the diameter of high-voltage electrode, the removal rate of NOx increased.
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