Three-ring PAH removal from waste hot gas by sorbents: influence of the sorbent characteristics.
Three-ring polycyclic aromatic hydrocarbons (PAH) are one of the most abundant PAH groups emitted during coal combustion. Four of them-acenaphthene (Ac), phenanthrene (Phe), fluorene (Fu), and anthracene (An)-have been listed by the U.S. EPA as priority pollutants. The aim in this paper is to study the abatement of this particular group of three-ring PAH from hot gas emissions during energy generation in coal combustion. The three-ring PAH adsorption capacities are related to the morphological and chemical properties of the 16 sorbents used in this work. Single and multiple linear regressions-principal component regression (PCR)-were applied in this study. The main conclusions reached are, first, that the micropore volume is the most determinant parameter for removal of these PAHs and, second, that the adsorption of three-ring PAH by sorbents from waste hot gas emissions is inversely proportional to their volatility: the lower the PAH volatility, the higher the adsorbent adsorption capacity. The adsorption isotherms show that Phe and An, both examples of PAH with three aromatic rings, behave similarly. However, their behavior differs from that of Ac and Fu, compounds in which only two of their three rings exhibit an aromatic nature.
Mastral
A M
AM
Instituto de Carboquímica, CSIC, Zaragoza, Spain. AMastral@carbon.icb.csic.es
García
T
T
Callén
M S
MS
López
J M
JM
Navarro
M V
MV
Murillo
R
R
Galbán
I
I
D000327:Adsorption; D000397:Air Pollution / Q000517:prevention & control*; D003031:Coal; D005740:Gases; D017745:Incineration; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis* / Q000737:chemistry; D013696:Temperature; D014835:Volatilization
D003031:Coal; D005740:Gases; D011084:Polycyclic Aromatic Hydrocarbons