英语翻译4.ConclusionsMeasurements of H2O2 direct synthesis in a

英语翻译
4.Conclusions
Measurements of H2O2 direct synthesis in a TBR,with
Pd-CeS catalyst at 10 and 20 bar at -10 °C,have been reported
and discussed.Independent variations of gas and liquid flow
rates evidence large,nonlinear effects on both H2O2 productivity
and selectivity,always highlighting an optimum at conditions
intermediate within the range investigated.In addition,the role
of pressure (from 10 to 20 bar) indicates that a dramatic increase
of selectivity,up to values of 80%,can be achieved by raising
the pressure.Production rate remains rather poor,mainly
because of the competition of direct water synthesis clearly
spotted by comparing synthesis with decomposition and hy-
drogenation experiments,and the short contact time.
Perhaps the most significant conclusion that can be drawn is
that the reactor type and operation can dramatically modify (both
positively or negatively) the performances of the catalyst.While
much of the efforts on improving H2O2 direct synthesis remain
on the catalyst,results reported here suggest that good catalysts
can be better exploited in suitable,industrially viable reactors.
It is representative in this respect the comparison with semibatch
experiments with the same catalyst,14 where selectivity was
always below 50% vs the approximately 80% measured in the
TBR at 20 bar with suitable gas and liquid flow rates.