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B. Izadkhah,S.R. Nabavi,D. Salari,T. Mahmuodi Badiki,N. Caylak,A. Niaei 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.6
A neural network model was coupled with genetic algorithm to find an optimal catalyst for elimination of volatile organic compounds (VOCs). The model was based on simultaneous investigation of catalyst formulation, preparation condition, and loaded metal atomic descriptors as representative of each metal,which enables us to evaluate catalyst composition with much fewer experimental data. We have investigated oxides of first transition metal series (V, Cr, Mn, Fe, Co, Ni, Cu and Zn) as a promoter for Ag-ZSM-5 catalyst. Three optimum catalysts, Fe–Ag-ZSM-5, Ni–Ag-ZSM-5, and V–Ag-ZSM-5 were found to have more catalytic activity for VOC (ethyl acetate) oxidation than Ag-ZSM-5.
P. Nakhostin Panahi,A. Niaei,D. Salari,S.M. Mousavi 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
The selective catalytic reduction (SCR) of NO with NH3 in the presence of oxygen over a series of H-ZSM-5 supported transition metal oxides (Co, Mn, Cr, Cu and Fe) was investigated. Among them, Cu/ZSM-5nanocatalyst was found to be the most promising catalyst based on activity. The modification of Cu/ZSM-5 by adding different transition metals (Co, Mn, Cr and Fe) to improve the efficiency of NO conversion was studied. The results indicated that the Fe–Cu/ZSM-5 bimetallic nanocatalyst was the highest active catalyst for NO conversion (67% at 250 8C and 93% at 300 8C). Response surface methodology (RSM) involving central composite design (CCD) was employed to evaluate and optimize Fe–Cu/ZSM-5 preparation parameters (Fe loading, calcinations temperature, and impregnation temperature) in SCR of NO at 250 8C. The optimum condition for maximum NO conversion was estimated at 4.2 wt.% Fe loading, calcinations temperature of 577 8C and impregnation temperature of 43.5 8C. Under these condition, experimental NO conversion efficiency was 78.8%, which was close with the predicted value (79.4%).
Effect of second metal on the selectivity of Mn/H-ZSM-5 catalyst in methanol to propylene process
N. Hadi,S.R. Nabavi,A. Niaei,M. Navaei Shirazi,R. Alizadeh 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-
In order to attain to the higher selectivity of propylene in the process of methanol conversion topropylene (MTP) over H-ZSM-5, the bi element catalysts were prepared by Mn/H-ZSM-5 and each ofCe, Cr, Fe, P and Ni promoters. The results revealed that the Ce–Mn/H-ZSM-5 demonstrated the highestselectivity to propylene. Response surface methodology was applied to optimize the preparationparameters (second metal loading, calcination temperature and calcination time) of the bimetallicCe–Mn/H-ZSM-5 catalyst. Kinetic modeling is performed in the reaction temperature range of440–500 8C and in the different weight hourly space velocities of methanol (i.e., 2.51, 4.18 and8.37 h 1). A reaction mechanism based on the theory of hydrocarbon pool and conjugate methylation/cracking mechanisms is applied for the MTP. The hybrid genetic algorithm is employed to calculate thekinetic parameters.