Topic
NOx
About: NOx is a research topic. Over the lifetime, 26367 publications have been published within this topic receiving 496555 citations.
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TL;DR: In this paper, the authors showed that the combination of Co 2+, Mn 2+ and Ni 2+ with certain types of zeolites, e.g., ZSM-5 and mordenite, are active catalysts for NO x with methane in an oxidizing atmosphere.
Abstract: Catalytic reduction of NO x with methane in an oxidizing atmosphere was studied over metal exchanged zeolites. We found that the combinations of Co 2+ , Mn 2+ and Ni 2+ with certain types of zeolites, e.g., ZSM-5 and mordenite, are active catalysts for this reaction. For a Co-ZSM-5 catalyst, the nitric oxide conversion displays a volcano-shape curve as temperature increases, which is reversible upon decreasing temperature. The nitric oxide reduction activity is proportional to the level of Co 2+ exchanged into ZSM-5, but excess amounts of cobalt do not contribute to the activity. Mn-ZSM-5 is very similar to Co-ZSM-5 in the nitric oxide reduction activity, and Ni-ZSM-5 has slightly lower activity compared to Co-ZSM-5. Under an oxidizing conditions, Cu-ZSM-5, however, is ineffective for the nitric oxide reduction. Co-Y, which has much more Co 2+ , is much less active compared to Co-ZSM-5, or Co-mordenite. The amount of nitric oxide adsorbed, measured by TPD, on Co-Y is extremely small (NO/Co=0.06) compared to Co-ZSM-5 (NO/Co > 1.1) and Co-mordenite (NO/Co=0.8).
264 citations
TL;DR: In this paper, the effects of using diethyl ether and ethanol as additive to biodiesel/diesel blends on the performance, emissions and combustion characteristics of a direct injection diesel engine were evaluated.
263 citations
TL;DR: In this article, the development of Cu-chabazite (CHA) catalysts represents a significant technology breakthrough for the removal of NOx by selective catalytic reduction (SCR) with ammonia.
Abstract: The development of Cu-chabazite (CHA) catalysts, i.e. Cu-SSZ-13 and Cu-SAPO-34, represents a significant technology breakthrough for the removal of NOx by selective catalytic reduction (SCR) with ammonia. Cu-CHA catalysts show an excellent hydrothermal stability towards high temperature aging and wide active temperature windows for the ammonia SCR reaction. This work summarizes the recent progress in the development of the Cu-CHA catalysts for the NH3-SCR reaction. The state of Cu in the reaction and the preparation methods on the catalytic performance are discussed. The advances in the understanding of the reaction mechanism are reviewed. The hydrothermal stability of the typical Cu-CHA catalysts are compared.
263 citations
TL;DR: In this paper, the Sundance Fire was used to model the emissions from major fires that have occurred in the United States, which released 0.019, 0.151, 1.545, and 0.007 Tg of particulate matter, carbon monoxide, carbon dioxide, and oxides of nitrogen.
263 citations
TL;DR: In this article, a process capable of removing NO x, SO 2 and mercury simultaneously was proposed, which utilizes the injection of ozone and assist with a glass made alkaline washing tower.
262 citations