title: The roles of various plasma species in the plasma and plasma-catalytic removal of low-concentration formaldehyde in air.
abstract: 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(2)O(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(2)O(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(2)O(3) catalyst significantly reduced the emission of discharge byproducts (O(3)) and organic intermediates (HCOOH).
authors.affiliation: School of Chemistry and Environment, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China.
authors.forename: Xing
authors.initials: X
authors.lastname: Fan
authors.forename: Tianle
authors.initials: T
authors.lastname: Zhu
authors.forename: Yifei
authors.initials: Y
authors.lastname: Sun
authors.forename: Xiao
authors.initials: X
authors.lastname: Yan
mesh_terms: D000042:Absorption; D000393:Air Pollutants / Q000032:analysis / Q000302:isolation & purification*; D000537:Aluminum Oxide / Q000737:chemistry; D002384:Catalysis; D004735:Energy Transfer; D052918:Environmental Restoration and Remediation / Q000295:instrumentation / Q000379:methods*; D004867:Equipment Design; D005557:Formaldehyde / Q000032:analysis / Q000302:isolation & purification*; D005561:Formates / Q000032:analysis; D017895:Manganese Compounds / Q000737:chemistry; D010087:Oxides / Q000737:chemistry; D010126:Ozone / Q000032:analysis
chemical_list: D000393:Air Pollutants; D005561:Formates; D017895:Manganese Compounds; D010087:Oxides; C030544:formic acid; D005557:Formaldehyde; C027424:manganese oxide; D010126:Ozone; D000537:Aluminum Oxide