Topic
Selective catalytic reduction
About: Selective catalytic reduction is a research topic. Over the lifetime, 10502 publications have been published within this topic receiving 226291 citations.
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TL;DR: In this paper, a series of catalysts of manganese oxide supported on TiO 2 and iron-manganese oxide support with different amounts of Manganese and iron were studied for low-temperature selective catalytic reduction (SCR) of NO with ammonia in the presence of excess oxygen.
Abstract: A series of catalysts of manganese oxide supported on TiO 2 and iron–manganese oxide supported on TiO 2 with different amounts of manganese and iron were studied for low-temperature selective catalytic reduction (SCR) of NO with ammonia in the presence of excess oxygen. It was found that the addition of iron oxide not only increased the NO conversion and N 2 selectivity but also increased the resistance to H 2 O and SO 2 . The Fe–Mn/TiO 2 catalysts yield high activities and high N 2 product selectivity. The N 2 O product selectivity increased with the amount of MnO x as well as temperature. Crystalline phase of MnO x was present at ≥15% Mn on TiO 2 , and the amount increased with Mn content. In addition, SO 2 and H 2 O decreased the activities only slightly, while such effect was reversible. The Fe–Mn/TiO 2 with Mn/Fe=1 showed the highest activity. The results showed that this catalyst yielded nearly 100% NO conversion at 120 °C at a space velocity of 15,000 h −1 . The effect of oxygen was also studied. Reversible transient behaviors similar to that on other oxide catalysts, including vanadia and chromia, were observed for the Fe–Mn/TiO 2 catalyst.
503 citations
TL;DR: In this paper, low-temperature SCR of NO with NH3 in the presence of excess oxygen on the oxides of V, Cr, Mn, Fe, Co, Ni, and Cu supported on anatase TiO2 has been studied.
502 citations
TL;DR: In this article, a novel method for the preparation of superior Fe/ZSM-5 catalysts is described, where FeCl 3 is sublimed into the cavities of H 2 -TPR, where it reacts chemically with the acid sites of the zeolite.
494 citations
TL;DR: It is proposed that future research in this area should focus on determining the reaction mechanism and kinetics and searching for more cost-effective catalyst and support materials.
Abstract: Methods for removing mercury from flue gas have received increased attention because of recent limitations placed on mercury emissions from coal-fired utility boilers by the U. S. Environmental Protection Agency and various states. A promising method for mercury removal is catalytic oxidation of elemental mercury (Hg0) to oxidized mercury (Hg2+), followed by wet flue gas desulfurization (FGD). FGD cannot remove Hg0, but easily removes Hg2+ because of its solubility in water. To date, research has focused on three broad catalyst areas: selective catalytic reduction catalysts, carbon-based materials, and metals and metal oxides. We review published results for each type of catalyst and also present a discussion on the possible reaction mechanisms in each case. One of the major sources of uncertainty in understanding catalytic mercury oxidation is a lack of knowledge of the reaction mechanisms and kinetics. Thus, we propose that future research in this area should focus on two major aspects: determining the reaction mechanism and kinetics and searching for more cost-effective catalyst and support materials.
492 citations
TL;DR: In this article, the reaction mechanism and catalytic cycle for the selective catalytic reduction of nitric oxide by ammonia over vanadia/titania catalysts has been elucidated by in situ on-line FTIR studies under steady-state conditions.
488 citations