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Catalytic combustion of VOCs over a series of manganese oxid

作者:ihpa.net 发布时间:2017-09-24

Applied Catalysis B:Environmental 98 (2010) 180–185

Contents lists available at ScienceDirect

Applied Catalysis B:

Environmental

j o u r n a l h o m e p a g e :w w w. e l s e v i e r. c o m /l o c a t e /a p c a t

b

Catalytic combustion of VOCs over a series of manganese oxide catalysts

Sang Chai Kim a , , Wang Geun Shim b

a b

Department of Environmental Education, Mokpo National University, 61, Dorim Ri, Cheonggye Myeon, Muan 534-729, Republic of Korea School of Applied Chemical Engineering, Chonnam National University, 300, Yongbong Dong, Buk-Ku, Gwangju 500-757, Republic of Korea

a r t i c l e i n f o a b s t r a c t

Catalytic combustion of volatile organic compounds (VOCs:benzene and toluene) was studied over man-ganese oxide catalysts (Mn3O 4, Mn 2O 3and MnO 2) and over the promoted manganese oxide catalysts with alkaline metal and alkaline earth metal. Their properties and performance were characterized by using the Brunauer Emmett Teller (BET),temperature programmed reduction (TPR),X-ray diffraction (XRD)and X-ray photoelectron spectroscopy (XPS).The sequence of catalytic activity was as follows:Mn 3O 4>Mn 2O 3>MnO 2, which was correlated with the oxygen mobility on the catalyst. Each addition of potassium (K),calcium (Ca)and magnesium (Mg)to Mn 3O 4catalyst enhanced the catalytic activity of Mn 3O 4catalyst. Accordingly, K, Ca and Mg seemed to act as promoters, and the promoting effect might be ascribed to the defect-oxide or a hydroxyl-like group. A mutual inhibitory effect was observed between benzene and toluene in the binary mixture. In addition, the order of catalytic activity with respect to VOC molecules for single compound is benzene >toluene, and the binary mixture showed the opposite order of toluene >benzene.

2010 Published by Elsevier B.V.

Article history:

Received 24February 2010

Received in revised form 25May 2010Accepted 25May 2010

Available online 1 June 2010Keywords:

Catalytic combustion Manganese oxide Alkaline metal

Alkaline earth metal Promoter

1. Introduction

Volatile organic compounds (VOCs)are not only hazardous air pollutants because of their toxic, malodorous, mutagenic and car-cinogenic nature, but they are also ozone and smog precursors [1–3]. Catalytic oxidation is recognized as a potent method of con-trolling emissions of VOCs owing to its low thermal NO x emissions, low operating cost, and high destructive efciency[4,5]. At present, supported noble metals (Ptand Pd) [6–10]and metal oxides cata-lysts [11–13]are used for reduction of VOCs emissions. Especially, transition metal oxides have shown a very good catalytic perfor-mance in oxidation reactions. Moreover, they have lower costs and higher resistance to poisons [13,14].

Manganese oxides such as Mn 3O 4[15], Mn 2O 3[16]and MnO 2[17]are known for exhibiting high activity in the oxidation of hydrocarbons. Recently, Ramesh et al. [18]have reported that the reactivity shows an order of MnO ≤MnO 2,Colloidal goldAluminium Nitride powdercopper powderCopper powderZinc Sulfide powder

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