摘要

In this study, the effects of operation variables on catalytic performance of CeO2-MnOx (0.25)-Ba mixed oxide in catalytic reduction of NO with ammonia are investigated by using design of experiments. A response surface methodology (RSM) combined with the central composite design (CCD) is used to model and optimize the process variables, including concentration of O-2 (vol.%), NH3/NO ratio in the gas feed, gas hourly space velocity (GHSV) and reaction temperature (degrees C) on the NO conversion and N-2 selectivity as responses. The R-2 values for both generated models were greater than 0.9, confirming the capability of quadratic RSM model in fitting the obtained experimental data. According to the results, GHSV had the largest and negative effect on the NO conversion, while it was an insignificant parameter on the N-2 selectivity in the design space. Also, NH3/NO ratio was the most effective parameter on the N-2 selectivity. Under the optimum conditions: 4.75 vol.% O-2, NH3/NO ratio of 0.9, GHSV of 12,000 h(-1) and 197.5 degrees C, the predicted values for NO conversion and N-2 selectivity were 96.47% and 93.96%, respectively. The obtained experimental values in optimum condition agreed with those predicted, indicating suitability of the RSM model to estimate the values of the responses.

  • 出版日期2014-3-4

全文