Research On Purifying NO By Active Carbon Fibers Loaded Lanthanon Oxide

Active carbon fibers (ACF) have strong adsorbent because of their large specific surface areas and vast micro-pores that most of them distributing on the surface of ACF. And there have been proved up a large amount of Lanthanon minerals in our country, the Lanthanon have widely potential application use in environmental catalysing and etc. for their active and special chemical characters. This paper introduces the NO_x actuality pollution of our country and its damage and the character and the preparation of ACF and the physical and chemical characters of Lanthanon, and then it is discussed that the technique and principle and international research and application actuality on purifying NO_x. And the purpose of this paper is to find an effective and economical loaded model catalyzer on purifying NO_x, and at the same time to find a new way to utilize the ACF and the Lanthanon together.It's the first time that the catalyzer is prepared by integrating the ACF physical character with the Ln2O3 chemical character. Firstly, some La₂O₃/ACF and Ce₂O₃/ACF were prepared by the ACF loaded La₂O₃ and Ce₂O₃, and according to the demand of the experiment, the blank ACF and the HNO3/ACF and some CuO/ACF were also prepared. In the following experiment their activity were studyed and compared.In order to study the impact degree on purifying NO by the following four important factors as the R2O3 loaded quantity(R2O3%) and the temperature(T/℃) and the mixed gaseous airspeed(V/m3?h-?m-3 or h-) and the oxygen's bulk percent in the mixed gases(O2%), the L9(34) experiment was designed. The experiment results showed that the most important factor in the catalysing experiment was the temperature; it was followed by the oxygen's bulk percent in the mixed gaseous, and the mixed gaseous airspeed then was and the R2O3 loaded quantity. And at the same time what we also could find from the experiment were that the factors'level that we should setted were that the oxygen's bulk percent in the mixed gaseous was 5% and the mixed gaseous airspeed was 5000 h-, because there were so many possibility in the experiment about the temperature and the R2O3 loaded quantity that we couldn't give the factors level before more experiments were done.According to the results of the L9(34) experiment, we mixed the gas by the following bulk percent ratio that the NO%=0.1% and the NH3%=0.11% and the O2%=5% and the others was N2, and the mixed gaseous airspeed was 5000 h-, and the catalyzer's loaded quantity normally was 0.5000 g, and the temperature range was 150⁴50℃(according to the experiment the most high temperature could be 600℃). In these environments the activity experiments on purifying NO by the blank ACF catalyzer and the HNO3/ACF catalyzer and the CuO/ACF catalyzers and the La₂O₃/ACF catalyzers and the Ce₂O₃/ACF catalyzers were carryed out. And then the catalyzers'activity and stability were compared transversely and lengthways. The experiment results showed that though the HNO3/ACF catalyzer had better activity in lower temperature, but its stability was too bad; and the 20%La₂O₃/ACF had better activity and stability at higher temperature, but its activity in lower temperature should be improved; and the 10%Ce₂O₃/ACF had the best holistic activity and stability; and though the CuO/ACF catalyzers had been studyed for many years, but its the holistic activity was the worst among the catalyzers. And furthermore the catalyzers'activity on purifying NO of the 20%La₂O₃/ACF and the 10%Ce₂O₃/ACF was over 95% when the temperature was over 300℃, and the catalysing stability of the 20%La₂O₃/ACF was largely improved and reached 8h at 200℃by loaded 1.0000g catalyzer. So we could get the conclusion that the 20%La₂O₃/ACF and the 10%Ce₂O₃/ACF were the best catalyzers of all.At last, the TG and XRD and SEM and FT-IR experiments were carryed out to estimate the selected catalyzers'physical and chemical characters. And the results of physical and chemical character experiments not only testifyed the results of the compared experiments but also provided theoretic base of the catalyzers'improvement.