等离子体协同改性凹凸棒石催化脱除NOx的研究

采用等离子体协同改性凹凸棒石催化脱除NOx,研究了等离子体反应器输入电压和凹凸棒石煅烧温度对NO和NOx脱除率的影响规律.结果表明,当反应器输入电压30kV时,NO和NOx脱除率随等离子体输入电压增加而增大.凹凸棒石煅烧温度对催化活性也具有显著影响,当煅烧温度600℃时,部分凹凸棒石被烧结熔融, NO和NOx脱除率都不高;当煅烧温度为400~600℃时,凹凸棒石活性较高, NO和NOx脱除率可达最大值.本实验条件下最佳工艺参数为等离子体输入电压>30kV, 凹凸棒石煅烧温度为400~600℃,NOx最大脱除率可达89.6%.

Study on removing NOx by plasma combined with modified attapulgite clay catalyst

The way of plasma combined with modified attapulgite clay catalyst was adopted to remove NOx and investigations for effect of input voltage of plasma reactor and calcining temperature of attapulgite clay on NO and NOx removal ratio were presented. When the input voltage was smaller then 30 kV it had a little infection on NO and NOx removal ratio, but as the input voltage was bigger than 30 kV, with the input voltage increasing the NO and NOx removal ratio enhance. when calcining temperature was smaller than 400℃, the attapulgite clay activated insufficient. when the temperature bigger than 600℃, some parts of the clay would be fused and agglomerated, so the NO and NOx removal ratio was lower. When the temperature was 400~600℃, the activation of attapulgite clay could reach the best form. The maximum value of NOx removal ratio was 89.6% under the condition of input voltage bigger than 30 kV and the temperature at 400~600℃.