Recent Advances on Nitrous Oxide (N2O) Decomposition over Non-Noble-Metal Oxide Catalysts: Catalytic Performance, Mechanistic Considerations, and Surface Chemistry Aspects
Recent Advances on Nitrous Oxide (N2O) Decomposition over Non-Noble-Metal Oxide Catalysts: Catalytic Performance, Mechanistic Considerations, and Surface Chemistry Aspects
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DOI：
10.1021/acscatal.5b01605
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发表时间：
2015-11-01
期刊：
影响因子：
12.9
通讯作者：
Konsolakis, Michalis
中科院分区：
文献类型：
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作者：
Konsolakis, Michalis
一氧化二氮（N2 O）是平流层最大的臭氧消耗物质，同时也是第三大温室气体。直接催化分解N2 O（deN（2）O）技术是最有前途的N2 O减排技术之一。尽管贵金属（NM）基催化剂表现出令人满意的deN（2）O性能，但它们的高成本和对各种流出物流组分（例如，水蒸气、氧气）限制了它们广泛的工业应用。因此，开发成本低、脱氮性能好的无纳米材料催化剂具有重要意义。本文综述了2000年以来非贵金属氧化物催化剂上N2 O分解研究的最新进展。首先，简要概述了N2 O的来源，环境后果和修复技术。本文对无NM的金属氧化物（MO）上的deN（2）O过程相关文献进行了分类和批判性讨论，如下：（i）裸氧化物，（ii）六铝酸盐，（iii）水滑石，（iv）尖晶石，（v）钙钛矿，和（iv）不属于上述类别的混合金属氧化物。本文从反应机理、构效关系、各种抑制剂的作用（如，O-2、NO、H2O）以及调控MO局部表面结构的策略。还提供了通过先进的制备路线和/或电子促进对MO的表面化学进行微调的基本见解，为现实生活中的能源和环境应用铺平了道路，超越了deN（2）O过程。
Nitrous oxide (N2O) is the largest stratospheric-ozone-depleting substance, being concomitantly the third most potent greenhouse gas. The direct catalytic decomposition of N2O (deN(2)O process) is one of the most promising remediation technologies for N2O emissions abatement. Although noble metals (NMs)-based catalysts demonstrate satisfactory deN(2)O performance, their high cost and sensitivity to various effluent stream components (e.g., water vapor, oxygen) limit their widespread industrial applications. Hence, the development of NMs-free catalysts of low cost and satisfactory deN(2)O performance is of paramount importance. This survey appraises the recent advances, which have been reported since 2000, on N2O decomposition over non-noble-metal oxidic catalysts. Initially, a brief overview of N2O sources, environmental consequences, and remediation technologies is provided. The literature related to the deN(2)O process over NMs-free metal oxides (MOs) is categorized and critically discussed, as follows: (i) bare oxides, (ii) hexaaluminates, (iii) hydrotalcites, (iv) spinels, (v) perovskites, and (iv) mixed metal oxides not belonging in the above categories. This review covers several aspects with respect to the reaction mechanisms, the structure-activity correlations, the role of various inhibitors (e.g., O-2, NO, H2O) as well as the strategies followed to adjust the local surface structure of MOs. Fundamental insights toward fine-tuning of surface chemistry of MOs by means of advanced preparation routes and/or electronic promotion are also provided, paving the way for real-life energy and environmental applications, beyond the deN(2)O process.