Catalytic oxidation of NO over Activated Semi-cokes by Different Preparation Methods

摘要

The objective of this research is to use semi-cokes the raw material to prepare catalysts of NOX removal by Selective catalytic oxidation(SCO). the methods of hydrothermal activation, nitric acid activation and calcining activation were adopted to increase the activity .The prepared catalyst was tested in the fixed bed reactor (?14mm×280mm) under the condition of atmosphere: the temperature 70 ??, space velocity 600h -1 , the concentrations of O2 and NO being 5% and 320ml/m 3 respectively.The results showed that nitric acid activation could get great effort to decease the content of ash; P-H2O2 contained more volatiles and solid carbon; Calcining activation got the catalyst of lower volatiles and more solid carbon but The present of O2 brought more volatiles in the calcining activation; the nitric acid activation increased the acidic functional groups; hydrothermal activation had increased the quantity of both acidic and basic functional groups; calcining activation can lead to the generation of the basic surface on the sample. All the activation method would increase the surface area. However, the sample of HT-40+ O2 got the biggest surface areas, 252.7 m 2 /g . Generally speaking, acidic surface hindered the NO oxidation and the basic functional groups could stimulate the processing and sample of HT-40+O2 get the best result of 1050min of TB.