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.
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