臭氧催化氧化去除苯乙烯废气的研究

Removal of Styrene Waste Gas by Ozone Catalytic Oxidation

以硝酸锰溶液为原料,采用焙烧法制备了MnO_(x)催化剂,采用X-射线衍射(XRD)、比表面积测试(BET)、扫描电镜(SEM)对催化剂进行表征,考察了焙烧温度、Mn负载量、载体种类及Ce负载量等因素对催化剂性能的影响,研究了MnO_(x)催化剂协同臭氧氧化对苯乙烯的去除效果,同时比较了单独臭氧氧化、MnO_(x)催化剂协同臭氧氧化对苯乙烯的去除效果。结果表明,所制备的催化剂结构与目标结构一致;在焙烧温度为500℃、Mn负载量为5%、载体为γ-Al_(2)O_(3)、Ce负载量为1%的条件下,制备的1%Ce-5%MnO_(x)/γ-Al_(2)O_(3)催化剂性能最佳;在苯乙烯浓度为1000 mg·m^(-3)、臭氧投加量为200 mg·m^(-3)、反应停留时间为4.0 s的条件下,单独臭氧氧化苯乙烯的去除率为34.2%,1%Ce-5%MnO_(x)/γ-Al_(2)O_(3)催化剂协同臭氧氧化苯乙烯的去除率为90.4%,较单独臭氧氧化提升了约1.6倍。

Using manganese nitrate solution as raw material,we prepared MnO_(x) catalyst by a calcination method,and characterized the catalyst by X-ray diffraction(XRD),specific surface area test(BET),and scanning electron microscopy(SEM).Moreover,we investigated the effects of calcination temperature,Mn loading amount,carrier type,and Ce loading amount on the performance of the catalyst.Furthermore,we studied the removal effect of styrene by MnO_(x) catalyst combined with ozone oxidation,and compared the removal effects of styrene by ozone oxidation alone and MnO_(x) catalyst combined with ozone oxidation.The results show that the structure of the prepared catalyst is consistent with the target structure.When the calcination temperature is 500℃,the Mn loading amount is 5%,γ-Al_(2)O_(3) is adopted as the carrier,and Ce loading amount is 1%,the prepared 1%Ce-5%MnO_(x)/γ-Al_(2)O_(3) catalyst has the best performance.The removal rate of styrene is 34.2%by ozone oxidation alone,and the removal rate of styrene is 90.4%by 1%Ce-5%MnO_(x)/γ-Al_(2)O_(3) catalyst combined with ozone oxidation,which is about 1.6 times higher than that by ozone oxidation alone,under the conditions as follows:the styrene concentration is 1000 mg·m^(-3),the ozone dosage is 200 mg·m^(-3),and the reaction retention time is 4.0 s.