A novel tungsten-doped CeO2 catalyst was fabricated via the sweet potato starch bio-template spread self-combustion (SSC) method to secure a high NH3-SCR activity. The study focuses on the influence of ignition temperature on the physical structure and redox properties of the synthesized catalyst and the catalytic performance of NOx reduction with NH3. These were quantitatively examined by conducting TG-DSC measurements of the starch gel, XRD analysis for the crystallites, SEM and TEM assessments for the morphology of the catalyst, XPS and H2-TPR measurements for the distribution of cerium and tungsten, and NH3-TPD assessments for the acidity of the catalyst. It is found that the ignition temperature shows an important role in the interaction of cerium and tungsten species, and the optimal ignition temperature is 500 °C. The increase of ignition temperature from 150 °C is beneficial to the interactions of species in the catalyst, depresses the formation of WO3, and refines the cubic CeO2 crystallite. The sample ignited at 500 °C shows the biggest BET surface area, the highest surface concentration of Ce species and molar ratio of Ce3+/(Ce3++Ce4+), and the most abundant surface Brønsted acid sites, which are the possible reasons for the superiority of the NH3-SCR activity. With a high GHSV of 200,000 mL (g h)-1 and the optimal ignition temperature, Ce4W2Oz-500 can achieve a steadily high NOx reduction of 80% or more at a lowered reduction temperature in the range of 250~500 °C.

中文翻译：

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掺杂W的CeO2催化剂的淀粉生物模板合成，用于用NH3选择性催化还原NOx：着火温度的影响。

通过甘薯淀粉生物模板扩散自燃（SSC）方法制备了新型的钨掺杂CeO2催化剂，以确保较高的NH3-SCR活性。研究重点是着火温度对合成催化剂的物理结构和氧化还原性能的影响以及NH 3还原NO x的催化性能。通过对淀粉凝胶进行TG-DSC测量，对微晶进行XRD分析，对催化剂的形态进行SEM和TEM评估，对铈和钨的分布进行XPS和H2-TPR测量以及对NH3-TPD进行定量检查。评估催化剂的酸度。发现点火温度在铈和钨物种的相互作用中起重要作用，并且最佳点火温度为500℃。点火温度从150°C开始升高，有利于催化剂中物质之间的相互作用，抑制WO3的形成，并细化立方CeO2晶体。在500°C下点燃的样品显示出最大的BET表面积，最高的Ce种类表面浓度和Ce3 + /（Ce3 ++ Ce4 +）的摩尔比以及最丰富的布朗斯台德酸位点，这可能是造成这种现象的原因。 NH3-SCR活性的优越性。Ce4W2Oz-500具有200,000 mL（gh）-1的高GHSV和最佳点火温度，在250〜500°C的较低还原温度下，可以稳定地实现80％或更高的NOx还原。在500°C下点燃的样品显示出最大的BET表面积，最高的Ce种类表面浓度和Ce3 + /（Ce3 ++ Ce4 +）的摩尔比以及最丰富的布朗斯台德酸中心，这可能是造成这种现象的原因。 NH3-SCR活性的优越性。Ce4W2Oz-500具有200,000 mL（gh）-1的高GHSV和最佳点火温度，在降低的250-500°C的还原温度下，可以稳定地实现80％或更高的NOx还原。在500°C下点燃的样品显示出最大的BET表面积，最高的Ce种类表面浓度和Ce3 + /（Ce3 ++ Ce4 +）的摩尔比以及最丰富的布朗斯台德酸中心，这可能是造成这种现象的原因。 NH3-SCR活性的优越性。Ce4W2Oz-500具有200,000 mL（gh）-1的高GHSV和最佳点火温度，在250〜500°C的较低还原温度下，可以稳定地实现80％或更高的NOx还原。