Non-thermal-plasma-activated de-NOx catalysis

作者：Gholami Rahman; Stere Cristina E; Goguet Alexandre; Hardacre Christopher

来源：Philosophical Transactions of the Royal Society A-Mathematical Physical and Engineering Sciences, 2018, 376(2110): 20170054.

DOI：10.1098/rsta.2017.0054

<jats:p>
The combination of non-thermal plasma (NTP) with catalyst systems as an alternative technology to remove NO
<jats:sub>x</jats:sub>
emissions in the exhaust of lean-burn stationary and mobile sources is reviewed. Several factors, such as low exhaust gas temperatures (below 300°C), low selectivity to N
<jats:sub>2</jats:sub>
and the presence of impurities, make current thermally activated technologies inefficient. Various hybrid plasma–catalyst systems have been examined and shown to have a synergistic effect on de-NO
<jats:sub>x</jats:sub>
efficiency when compared with NTP or catalyst-alone systems. The NTP is believed to form oxygenated species, such as aldehydes and nitrogen-containing organic species, and to convert NO to NO
<jats:sub>2</jats:sub>
, which improves the reduction efficiency of N
<jats:sub>2</jats:sub>
during hydrocarbon-selective catalytic reduction reactions. The NTP has been used as a pretreatment to convert NO to its higher oxidation states such as NO
<jats:sub>2</jats:sub>
to improve NO
<jats:sub>x</jats:sub>
reduction efficiency in the subsequent processes, e.g. NH
<jats:sub>3</jats:sub>
-selective catalytic reduction. It has been applied to the lean phase of the NO
<jats:sub>x</jats:sub>
storage to improve the adsorption capacity of the catalyst by conversion of NO to NO
<jats:sub>2</jats:sub>
. Alternatively, a catalyst with high adsorption capacity is chosen and the NTP is applied to the rich phase to improve the reduction activity of the catalyst at low temperature.
</jats:p>
<jats:p>This article is part of a discussion meeting issue ‘Providing sustainable catalytic solutions for a rapidly changing world’.</jats:p>

• 出版日期2018-1-13