整体式催化剂选择性催化氧化硫化氢

在堇青石蜂窝陶瓷基体上分两步涂覆了SiO₂和TiO₂两种涂层,再通过浸渍法制备了V₂O₅/TiO₂-SiO₂/堇青石整体式催化剂。采用BET、XRD、XRF、SEM和H₂-TPR等方法对催化剂进行了表征,并对催化剂的H₂S选择性催化氧化活性进行了评价。结果表明：V₂O₅负载量为20%（w）时,催化剂的活性最好;在反应温度180 ℃、空速3 000 h^-1、V（O₂）∶V（H₂S）=0.5的条件下,转化率达96.94%,硫产率达95.41%。在40 h的稳定性试验过程中,转化率稳定在96%左右,硫产率稳定在94%左右,催化剂的稳定性较好。与传统颗粒状催化剂相比,该整体式催化剂更具工业应用前景。

Selective catalytic oxidation of H2S on monolithic catalyst

The double coatings of SiO₂ and TiO₂ were formed on cordierite honeycomb ceramic by two steps,and the V₂O₅/TiO₂-SiO₂/cordierite monolithic catalyst was prepared by impregnation. The catalyst was characterized by Brunauer-Emmett-Teller method （BET）,X-ray diffusion （XRD）,X-ray fluorescence （XRF）,scanning electron microscopy （SEM）and H₂-temperature programmed reduction （H₂-TPR）,and the activity of the catalyst on H₂S selective catalytic oxidation was evaluated. The results showed that when the loading of V₂O₅ was 20% （w）,the activity of catalyst was optimum. Under the conditions of reaction temperature 180 ℃,space velocity 3 000 h^-1 and V（O₂）∶V（H₂S）=0.5,the conversion rate reached 96.94% and the sulfur yield reached 95.41%. In the process of 40 h stability test,the conversion rate stayed at around 96% and the sulfur yield stayed at around 94%,which showed that the stability of the catalyst was good. Compared with the traditional granular catalyst,the monolithic catalyst had better industrial application prospect.