Details

Autor(en) / Beteiligte

• Fan, Xing
• Zhu, Tianle
• Sun, Yifei
• Yan, Xiao

Titel

The roles of various plasma species in the plasma and plasma-catalytic removal of low-concentration formaldehyde in air

Ist Teil von

• Journal of hazardous materials, 2011-11, Vol.196, p.380-385

Ort / Verlag

Kidlington: Elsevier B.V

Erscheinungsjahr

2011

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• ► Roles of various plasma species in plasma and plasma-catalytic removal of formaldehyde (HCHO) in air were studied. ► Both short- and long-living plasma species contribute to HCHO removal in gas phase. ► O 3 does not initiate HCHO removal in gas phase but does over MnO x /Al 2O 3 catalyst. ► O 3 initiated catalytic reactions are mainly responsible for the enhanced HCHO removal by plasma-catalysis. ► The presence of downstream MnO x /Al 2O 3 catalyst greatly reduces the emission of discharge byproducts (O 3) and organic intermediates (HCOOH). The contributions of various plasma species to the removal of low-concentration formaldehyde (HCHO) in air by DC corona discharge plasma in the presence and absence of downstream MnO x /Al 2O 3 catalyst were systematically investigated in this study. Experimental results show that HCHO can be removed not only by short-living active species in the discharge zone, but also by long-living species except O 3 downstream the plasma reactor. O 3 on its own is incapable of removing HCHO in the gas phase but when combined with the MnO x /Al 2O 3 catalyst, considerable HCHO conversion is seen, well explaining the greatly enhanced HCHO removal by combining plasma with catalysis. The plasma-catalysis hybrid process where HCHO is introduced through the discharge zone and then the catalyst bed exhibits the highest energy efficiency concerning HCHO conversion, due to the best use of plasma-generated active species in a two-stage HCHO destruction process. Moreover, the presence of downstream MnO x /Al 2O 3 catalyst significantly reduced the emission of discharge byproducts (O 3) and organic intermediates (HCOOH).