Abstract
Catalytic combustion of isopropanol in the structured fixed-bed reactor was investigated over Co–ZSM-5 zeolite membrane catalysts. Firstly, ZSM-5 zeolite membrane catalysts with different Si/Al ratios were coated onto the surface of stainless steel fibres via secondary growth method and wet lay-up paper-making method. Then, cobalt oxides were loaded onto the zeolite membranes by impregnation method. The performance of catalytic combustion of isopropanol was conducted over the prepared zeolite membrane catalysts, and the experimental results showed that the catalyst with infinite Si/Al ratio has the highest catalytic activity for the combustion with the lowest T90 of isopropanol (285°C). Finally, the effects of bed structure, feed concentration, gas hourly space velocity and reaction temperature on the catalytic performance were investigated to analyse the kinetics of isopropanol over the catalyst with infinite Si/Al ratio in the structured fixed-bed reactor. The results showed that the longer residence time could cause higher reaction contact efficiency of isopropanol combustion. T90 of isopropanol can be dramatically decreased by 105°C in the fixed-bed reactor packed with Co–ZSM-5 zeolite membrane catalysts, compared to the fixed-bed reactor packed with granular catalyst.
Highlights
Catalytic combustion as the most effective method for the removal of volatile organic compounds (VOCs) from the exhaust gases is widely used in the industrial area
X-ray diffraction (XRD) patterns of Co –ZSM-5 zeolite membranes with different Si/Al ratios are very similar and no specific orientation or orientation differences between the samples could be derived from these patterns, which has been confirmed in other literature as well [25,26]
Morphology and structure of the synthesized Co–ZSM-5 zeolite membrane catalysts coated on microfibrous stainless steel with different Si/Al ratios (60, 180, 1) were analysed by SEM, and the intensity rsos.royalsocietypublishing.org R
Summary
Catalytic combustion as the most effective method for the removal of volatile organic compounds (VOCs) from the exhaust gases is widely used in the industrial area. As Fan et al reported, open-cell SiC foams clearly are promising materials for continuous-flow chemical applications such as heterogeneous catalysis and distillation [2,3], the X-ray micro-computed tomography characterization results showed that the spatial voxel size of cellular b-SiC foams was 13.63 mm, and diffusion coefficient of laminar flow within foams was dramatically increased. Ribeiro et al [5] investigated the effects of preparation methods of Pt zeolite coated on cordierite foams on the catalytic performance for toluene combustion. The results showed that the enhanced performances of the structured catalysts for toluene catalytic combustion were due to open structure of foams and homogeneous thin zeolite layers deposited on their wall cells and the fact that the size and location of Pt particles present in zeolite are changed during the dipping steps. The results showed that higher contact efficiency with the lower internal and external diffusion resistance was obtained from the prepared catalysts
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