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RISS 인기검색어
- 검색키워드
- 저자 : 羅濬國 (검색결과 1 건)
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申允卿,羅濬國,任奭中,孟琦錫 忠南大學校 1965 論文集 Vol.4 No.-
Catalytic oxidation of ammonia is as familiar to us as "Ostwald Process" in which platinum is adapted as a catalyst. Owing to the expensiveness of platinum, catalysts of base metal oxides are developed. The mixt ures of iron and bismuth oxide, iron and cobaltoxide, etc. are well known to give a good oxidation coefficient in the temperature range of 600℃~ 800℃. But their heat resistance is not so good and catalytic activity connot be maintained for a long period at high temperatures. Therefore oxidation of ammonia at low temperature with the base metal oxides is the important questions for consideration. The catalytic activities of the Fe-Bi-Ca three component system catalysts at low temperatures are examined. The results of the preliminary and main experiments are summarized as follows. Using the catalysts of the Fe-Bi-Ca three component system, the following similarities are found. Oxides of nitrogen begin to be generated at a temperature of 300℃; at a temperature of 400℃, the oxidation coefficient of ammonia to oxides exceeds 10% ; above the temperature of 400℃, the higher the temperature, the greater the reaction of the oxidation coefficient of ammonia to the oxides. Among the catalysts of the Fe-Bi-Ca three component system, the Fe:Bi ratio is fixed to 97.5: 2.5 and only the calcium percentage is variable. Catalyst composed of Fe(96.3%), Bi(2.72%) and Ca(0. 98%), shows the highest oxidation coefficient and as the calcium percentage increases in the ternary system, the catalytic activity decreases. Oxidation of ammonia is remarkably influenced by the variation of flow rate of mixed gas. Considering the oxidation coefficient to nitrogen oxides and the decomposition coefficient separately, the oxidation coefficient to the oxides is gradually raised with the increase of the flow rate. On the other hand, the coeffiicent is decreased as the flow rate increases. The total oxidation coefficient is reduced as the result of summation of the two factors above. And the unchanged percentage of ammonia increases with the increase of flow rate.
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