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Effects of WO3 and SiO2 doping on CeO2–TiO2 catalysts for selective catalytic reduction of NO with ammonia

机译：WO3和SiO2掺杂在CeO2-TiO2催化剂中的影响，用于氨的选择性催化还原

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摘要

A series of CeO _(2) –WO _(3) /SiO _(2) –TiO _(2) (CeW _( x ) TiSi _( y ) ) catalysts with different loading amounts of WO _(3) were synthesized by wet co-impregnation of ammonium metatungstate and cerium nitrate on a SiO _(2) –TiO _(2) support, and were employed for the selective catalytic reduction (SCR) of NO by NH _(3) . The catalytic activity of the CeO _(2) /SiO _(2) –TiO _(2) (CeSiTi) catalyst was enhanced by the addition of WO _(3) , and the W-containing catalysts showed higher hydrothermal stability especially between 550 and 600 °C. The introduction of WO _(3) to the CeSiTi catalyst could produce more chemisorbed oxygen species, reducible subsurface oxygen species, acid sites and ad-NO _( x ) species. Moreover, the modification of CeO _(2) –WO _(3) /TiO _(2) (CeWTi) by SiO _(2) could enhance the specific surface area, especially the aged specific surface area, thus improving the hydrothermal stability of the catalyst.
机译：一系列CEO _（2）-wo _（3）/ siO_（2）-tio_（2）（CEW _（x）TISI _（Y））催化剂具有不同装载量的WO _（3）是通过掺钨酸铵和硝酸铈在SiO _（2）-tiO _（2）载体上的湿共浸渍合成，并用于选择性催化还原（SCR），NH _（3）。通过加入WO _（3）来增强CeO _（2）/ siO _（2）-TiO_（2）（Cesiti）催化剂的催化活性，含W催化剂尤其显示出更高的水热稳定性550和600°C。将WO_（3）引入CESITI催化剂可以产生更富化学吸附的氧物质，可降解的地下氧物质，酸性位点和AD-NO _（X）物种。此外，SiO_（2）的CEO _（2）-wo _（3）/ TiO _（2）（CEWTI）的修改可以增强特定表面积，尤其是老年的比表面积，从而提高水热稳定性催化剂。

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