Investigation of SCR denitrification performance of Fe-Beta zeolite catalysts based on the orthogonal experiments
In this study,orthogonal experiments were used to investigate and prepare Fe-Beta catalysts with highly effective NOx removal.A series of Fe-Beta catalysts were synthesized,and their catalytic performance in the selective catalytic reduction of NOx reaction by NH3(NH3-SCR)was investigated,the optimal formulations were screened out as follows:the SiO2∶Al2O3 ratio of 30,the solid-liquid ratio of 1∶20 g·mL-1,and the precursor solution concentration of 0.02 mol·L-1 prepared with Fe(NO3)3.9H2O.The Fe/Beta-30-1∶20(0.02)catalyst showed higher than 90％NO conversion and had an excellent N2 selectivity within 350～450 ℃.In addition,the Fe/Beta-30-1∶20(0.02)catalyst had good SO2 resistance and H2O resistance as well as an excellent hydrothermal stability.The characterization results showed that the addition of Fe(2.18％)in the Beta zeolite enhanced the active sites for SCR reaction and widened the active temperature window due to the synergistic effects of zeolite and Fe ions.Meanwhile,the Fe-Beta catalyst possessed large BET specific surface area,more uniform particle size and pore size,which was conducive to the NH3-SCR reaction.
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