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首页> 外文期刊>RSC Advances >The effects of calcination atmosphere on the catalytic performance of Ce-doped TiO2 catalysts for selective catalytic reduction of NO with NH3
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The effects of calcination atmosphere on the catalytic performance of Ce-doped TiO2 catalysts for selective catalytic reduction of NO with NH3

机译：煅烧气氛对掺Ce的TiO 2 催化剂对NH 3 选择性催化还原NO的催化性能的影响

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A series of well-reported Cex–Ti catalysts with a low content of Ce species were synthesized by a sol–gel method. The aim of this study was to investigate the influence of different calcination atmospheres on the formation of the Ce–O–Ti structure that comprises active sites for the selective catalytic reduction (SCR) of NO by NH3. Catalytic activity tests showed that the Cex–Ti–N (calcined under a nitrogen atmosphere) catalysts exhibited a significantly higher NO removal efficiency than Cex–Ti–A (calcined under air). Characterization results confirmed that more Ce species could incorporate into the TiO2 lattice when calcined under a nitrogen atmosphere, thus, more Ce–O–Ti structures were obtained over the Cex–Ti–N surface. This improved the NH3 adsorption and electron transfer from Ti to Ce. Therefore, N2 calcination increased the acid sites and improved the redox ability for Cex–Ti–N catalysts. In addition, it was found that the redox ability was the critical factor, which effectively promoted the low temperature SCR performance. Amongst the Cex–Ti–N catalysts, Ce5–Ti–N revealed the best SCR activity, catalytic stability and resistance to H2O and SO2. This study demonstrated the feasibility of N2 calcination in the syntheses of doped SCR catalysts and also explored the SCR reaction mechanism over the well-reported Cex–Ti catalysts. We expect that this study could shed some light on the development of feasible preparative routes for the syntheses of Metal-Ti catalysts for SCR application.
机译：通过溶胶-凝胶法合成了一系列报道较少的Ce含量低的Ce x -Ti催化剂。这项研究的目的是研究不同煅烧气氛对Ce-O-Ti结构形成的影响，该结构包含用于NH 3选择性还原NO的活性位点的活性位点。 sub> 。催化活性测试表明，Ce x -Ti-N（在氮气氛下煅烧）催化剂表现出比Ce高得多的NO去除效率 x –Ti–A（在空气中煅烧）。表征结果证实，在氮气氛下煅烧时，更多的Ce物种可掺入TiO 2 晶格中，因此在Ce < small> x -Ti-N表面。这改善了NH 3 的吸附和电子从Ti到Ce的转移。因此，N 2 煅烧增加了酸位并提高了Ce x 的氧化还原能力。小型––Ti–N催化剂。另外，发现氧化还原能力是关键因素，其有效地提高了低温SCR性能。在Ce x –Ti–N催化剂中，Ce 5 –Ti–N– N显示出最佳的SCR活性，催化稳定性和对H 2 O和SO 2 的抗性。这项研究证明了N 2 煅烧在掺杂SCR催化剂合成中的可行性，并探索了在报道充分的Ce < em> x -Ti催化剂。我们希望这项研究可以为开发用于SCR的金属钛催化剂的可行制备路线的发展提供一些启示。

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