The cyclic voltammogram of AgNPs sample prepared using watermelon rind extract as the reductant
shows a distinct oxidation peak at +291 mV (as shown in Figure 8).
N[H.sub.3] is thought to be used as reductant
directly since N[H.sub.3] aqueous solution can decompose into [H.sub.2] and [N.sub.2] by photocatalyst .
Ascorbate is the principal reductant
of chromium(VI) in rat lung ultrafiltrates and cytosols, and mediates chromium-DNA binding in vitro.
Some high-end models address this problem through a selective catalytic converter that reacts engine emissions with an on-board supply of a gaseous reductant
such as anhydrous ammonia, aqueous ammonia or urea.
The first type is thermal initiation where free radicals are generated by pyrolytic cleavage of covalent bond, whereas the second type is redox initiation where free radicals are generated by redox reaction between an oxidant and a reductant
. Thermal initiation requires higher temperature (above 70[degrees]C) whereas redox initiation can be done at a low range of temperature (0-50[degrees]C).
"The advantage of natural gas is not just the economics of its availability, but that using hydrogen as a reductant
lowers C[O.sub.2] emissions, " Seetharaman says.
1), that led to increase in soil Eh (Xu et al., 2013b) and decreased in soil reductant
contents, less Zn will be precipitated or co-precipitated.
Widely deployed in Class 8 trucks to meet sharply reduced Environmental Protection Agency emissions and particulate matter thresholds for on-highway diesel engines beginning in 2010, SCR is an advanced active emissions control technology system that injects a liquid reductant
agent through a special catalyst into the exhaust stream of a diesel engine.