Low-temperature selective catalytic reduction of NO with NH3 using perovskite-type oxides as the novel catalysts
Low-temperature selective catalytic reduction of NO with NH3 using perovskite-type oxides as the novel catalysts
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以钙钛矿型氧化物为新型催化剂的NH3低温选择性催化还原NO
DOI：
10.1016/j.molcata.2013.01.018
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发表时间：
2013-05
期刊：
影响因子：
--
通讯作者：
Biaohua Chen
中科院分区：
文献类型：
--
作者：
Na Luo;Wei Yang;Ning Liu;Biaohua Chen
为了研究钙钛矿型复合氧化物对NH3选择性催化还原NO的活性，采用柠檬酸盐络合法制备了一系列B位离子（B=Cu，Co，Mn，Fe）的LaBO 3和La 2BO 4钙钛矿型复合氧化物催化剂，并通过XRD，BET，NO+ O2和NH3的TPD等手段对催化剂进行了表征。结果表明，Mn基钙钛矿具有最好的催化活性，在250°C时NO转化率为78%。钙钛矿对NH3的吸附能力是影响其SCR性能的关键因素。在原位DRIFTS研究进一步进行了LaMnO 3，以探讨反应机理。结果表明，SCR反应起始于NH3的化学吸附，被认为是反应的速率控制步骤。该机制基本上涉及Langmuir-Hinshelwood机制，主要取决于NH 4+离子物种和亚硝酸盐物种之间的相互作用在低温范围内。
In order to investigate the activities of perovskite-type mixed oxides for selective catalytic reduction (SCR) of NO with NH3, a series of LaBO3or La2BO4perovskite-based catalysts with different B-site ions (B=Cu, Co, Mn, and Fe) was prepared by citrate complexation procedure and characterized by XRD, BET, TPD of NO+O2and NH3. It was found that Mn-based perovskite exhibited the best catalytic activity, yielding 78% NO conversion at 250°C. The NH3adsorption ability of the perovskites is the key factor for the SCR performance. In situ DRIFTS investigation was further carried out over LaMnO3to explore the reaction mechanism. It is revealed that the SCR reaction starts with NH3chemical adsorption, being thought as the rate-determining step. The mechanism essentially involves a Langmuir–Hinshelwood mechanism mainly depending on an interaction between NH4+ionic species and nitrite species in the low-temperature range.
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