V2O5/CNFs/蜂窝状堇青石催化剂的结构控制及其烟气脱硝性能

采用化学气相沉积法,在涂层Al2O3的蜂窝状堇青石表面生长纳米碳纤维(CNFs),通过负载V2O5催化剂,制成低温蜂窝状脱硝催化剂.采用SEM、TEM、XRD和XPS等分析方法,对所制催化剂的物化性质及其脱硝性能进行了分析.研究结果表明,当CNFs在堇青石表面的生长厚度为0.74μm时,所制CNFs/堇青石载体的压缩强度达34.46 MPa;在150~250℃范围内,V2O5/CNFs/蜂窝状堇青石催化剂表现出较高的低温脱除NO活性,其中当CNFs的生长量为12.5%、V2O5担载量为1%时,在250℃下NO的转化率达95%左右.

Structure Control of V2O5/CNFs/Cordierite Monolith Catalyst and Its Catalytic Performance on NO Removal from Flue Gas

Carbon nanofibers(CNFs) were grown on Al2O3-coated cordierite monolith by chemical vapor deposition.The microstructure of V2O5 catalyst supported on cordierite monolith with CNFs layer was investigated by using scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray powder diffraction(XRD) and X-ray photoelectron spectroscope(XPS) techniques,as well as its activity for the selective catalytic reduction(SCR) of NO by NH3.The compressive strength of prepared CNFs/cordierite monolith composite was 34.46 MPa and the thickness of CNFs layer was 0.74 μm.The V2O5/CNFs/cordierite monolith catalysts had high NO removal activity in the temperature range of 150 250℃.When the CNFs yield and V2O5 loading were 12.5% and 1%,respectively,the NO conversion of the catalyst could reach 95% at 250℃.