%0 Journal Article
%T 氨催化还原NO<sub>x</sub>中TiO<sub>2</sub>负载过渡金属催化剂的催化行为<br>Catalytic Performance of TiO<sub>2</sub> Support of Transition Metal Catalysts for NO Reduction by Ammonia
%A 骆迪迪
%A 潘华
%A 蓝宁
%A 陈郑辉
%A 王晟康
%A 吴谦
%A 陈雪松
%A 王莉
%J Hans Journal of Chemical Engineering and Technology
%P 272-281
%@ 2161-8852
%D 2019
%I Hans Publishing
%R 10.12677/HJCET.2019.93039
%X 采用溶胶–凝胶法合成了TiO<sub>2</sub>催化剂载体，并通过浸渍法制备了一系列TiO<sub>2</sub>负载过渡金属脱硝催化剂。结合N<sub>2</sub>吸脱附、X射线衍射(XRD)和X射线光电子能谱(XPS)等手段，及催化活性评价研究了过渡金属/TiO<sub>2</sub>催化剂在氨选择催化还原NO<sub>x</sub>(NH<sub>3</sub>-SCR)中的催化行为。研究表明：过渡金属/TiO<sub>2</sub>催化剂活性为Mn/TiO<sub>2</sub> &gt; Fe/TiO<sub>2</sub> &gt; Cr/TiO<sub>2</sub> &gt; Co/TiO<sub>2</sub>。Mn/TiO<sub>2</sub>催化剂的脱硝活性最好，在250℃时最大脱硝效率达到93%。过渡金属/TiO<sub>2</sub>催化剂的脱硝活性与催化剂的比表面积和孔体积成正相关性。催化剂的活性组分是决定催化剂活性的主要因素，Mn/TiO<sub>2</sub>、Co/TiO<sub>2</sub>、Cr/TiO<sub>2</sub>和Fe/TiO<sub>2</sub>催化剂中活性组分分别为Mn<sup>4+</sup>、Co<sub>3</sub>O<sub>4</sub>、Cr<sup>3+</sup>和Fe<sup>3+</sup>。合适的氧活性物种比值(O<sub>latt</sub>/O<sub>surf</sub> = 4.7)和高活性的<span style=\"background-color:#FFFFFF;color:#000000;font-family:\" serif\",tahoma,verdana,helvetica;font-size:12px;font-style:normal;font-weight:normal;line-height:1.5;text-decoration:none;\"=\"\" sans=\"\"> Mn</span><sup>4+</sup>活性位使得Mn/TiO<sub>2</sub>催化剂具有高催化活性。<br />
Support TiO<sub>2</sub> was synthesized by sol-gel method, and a series of transition metal/TiO<sub>2</sub> catalysts were prepared by impregnation method. Combination of N<sub>2</sub> adsorption-desorption, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) and catalytic behavior of NO reduction with NH<sub>3</sub> on transition metal/TiO<sub>2</sub> catalysts were carried out by activity test. The results show that the activities of transition metal/TiO<sub>2</sub> catalyst decrease in the order of Mn/TiO<sub>2</sub> &gt; Fe/TiO<sub>2</sub> &gt; Cr/TiO<sub>2</sub> &gt; Co/TiO<sub>2</sub>. Mn/TiO<sub>2</sub> catalyst exhibits the highest activity among various catalysts, and the maximum de-NO<sub>x</sub> efficiency can reach 93% at 250？C. The deNO<sub>x</sub> activity of transition metal/TiO<sub>2</sub> catalysts is positively correlated with the specific surface area and pore volume of the catalysts. The active component of the catalysts is the determining factor for the activity of the catalysts. The active sites of Mn/TiO<sub>2</sub>, Co/TiO<sub>2</sub>, Cr/TiO<sub>2</sub> and Fe/TiO<sub>2</sub> catalysts are Mn<sup>4+</sup>, Co<sub>3</sub>O<sub>4</sub>, Cr<sup>3+</sup> and FeCr<sup>3+</sup>, respectively. A suitable ratio of oxygen active species (O<sub>latt</sub>/O<sub>surf</sub> = 4.7) and active sites of<span style=\"background-color:#FFFFFF;color:#000000;font-family:\" serif\",tahoma,verdana,helvetica;font-size:12px;font-style:normal;font-weight:normal;line-height:1.5;text-decoration:none;\"=\"\" sans=\"\"> Mn</span><sup>4+</sup> make the high activity of Mn/TiO<sub>2</sub> catalyst.
%K 二氧化钛，过渡金属，催化还原，氮氧化物，催化行为<br>TiO<sub>2</sub>
%K Transition Metal
%K Catalytic Reduction
%K No<sub>x</sub>
%K Catalytic Performance
%U http://www.hanspub.org/journal/PaperInformation.aspx?PaperID=30560