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As the increase of vehicle exhaust emission from tunnels, car parks and other relatively closed space ,NOx brings people more and more harm to the surrounding environment of tunnels, car parks ,etc, so it is a pressing problem to strengthen and govern NOx;Now, in the most of NOx control technology, adsorption is an important and unique advantages method in this field。Zeolite is a good adsorbent, because of their uniform distribution of pore size, selectivity,thermal stability,chemical stability and high regeneration performance .it often becomes the best material for the field of absorbent, therefore, it has very broad application prospects to study the zeolite in the the field of environmental purification.It,s based on the self-innovation projects of Scientific Research and Design Institute of Chongqing Jiaotong about“the high concentrations of Road tunnel air pollution treated by soil purification technique.this article through addin g zeolite to study the influence of NOX removal on the basis of soil purification NOX removal rate.It focused on the influence of inlet concentration, mixing parts of modified zeolite, amount of modified zeolite, size of natural zeolite and gas humidity to the NOX removal rate. The experimental results showed that:in addition NO2, NO and NOX removal rate with the inlet concentration has a very good correlation;the modified zeolite mixed with the soil matrix has the best effect;the modified zeolite volume of 15% has the best removal efficiency;as the low concentrations of polluting gas, we’d better choose 50-200 mesh;with the relative humidity improved airflow, NOx removal efficiency is rising,with the relative humidity improved airflow, NOx removal efficiency is rising。
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