Flue gas denitrification. Selective catalytic oxidation of nitric oxide to nitrous oxide

Karlsson, Hans T.; Rosenberg, Harvey S.

doi:10.1021/i200027a031

Cited by 34 publications

(16 citation statements)

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“…Transition metal oxides are cheap and also have good catalytic activity and, thus, can be appropriate catalysts for the catalytic oxidation of NO. Among the variety of transition metal catalysts, Co-based and Mn-based catalysts display the best catalytic activity for NO oxidation [11]. However, the applications of Co-based catalysts are retarded due to the toxicity of cobalt although they attract much attention [12,13,14,15,16,17,18,19].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Oxidation of NO over MnOx–CeO2 and MnOx–TiO2 Catalysts

et al. 2016

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A series of MnO x -CeO 2 and MnO x -TiO 2 catalysts were prepared by a homogeneous precipitation method and their catalytic activities for the NO oxidation in the absence or presence of SO 2 were evaluated. Results show that the optimal molar ratio of Mn/Ce and Mn/Ti are 0.7 and 0.5, respectively. The MnO x -CeO 2 catalyst exhibits higher catalytic activity and better resistance to SO 2 poisoning than the MnO x -TiO 2 catalyst. On the basis of Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), and scanning transmission electron microscope with mapping (STEM-mapping) analyses, it is seen that the MnO x -CeO 2 catalyst possesses higher BET surface area and better dispersion of MnO x over the catalyst than MnO x -TiO 2 catalyst. X-ray photoelectron spectroscopy (XPS) measurements reveal that MnO x -CeO 2 catalyst provides the abundance of Mn 3+ and more surface adsorbed oxygen, and SO 2 might be preferentially adsorbed to the surface of CeO 2 to form sulfate species, which provides a protection of MnO x active sites from being poisoned. In contrast, MnO x active sites over the MnO x -TiO 2 catalyst are easily and quickly sulfated, leading to rapid deactivation of the catalyst for NO oxidation. Furthermore, temperature programmed desorption with NO and O 2 (NO + O 2 -TPD) and in situ diffuse reflectance infrared transform spectroscopy (in situ DRIFTS) characterizations results show that the MnO x -CeO 2 catalyst displays much stronger ability to adsorb NO x than the MnO x -TiO 2 catalyst, especially after SO 2 poisoning.

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Section: Introductionmentioning

confidence: 99%

Catalytic Oxidation of NO over MnOx–CeO2 and MnOx–TiO2 Catalysts

et al. 2016

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“…8d , indicate that the Cu 1 Bi 1 -mBeta is very stable in the presence of SO 2 (or H 2 O and SO 2 ). It is believed that the highly crystalline zeolite framework enables the catalyst to keep good stability against H 2 O, and the highly dispersity active speicies Bi can improve the SO 2 resistance to some extent 13 , which is very important for the NH 3 -SCR of NO x in the co-existence of H 2 O and SO 2 .…”

Section: Resultsmentioning

confidence: 99%

“…, Cu-loaded zeolite beta exhibited a good activity and hydrothermal stability in the NH 3 -SCR of NO x 11 12 . It is also reported that the introduction of Bi 2 O 3 can improve the SO 2 resistance 13 .…”

mentioning

confidence: 95%

One-pot hydrothermal synthesis of CuBi co-doped mesoporous zeolite Beta for the removal of NOx by selective catalytic reduction with ammonia

Xie

Zhou

et al. 2016

Sci Rep

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A series of CuBi co-doped mesoporous zeolite Beta (CuxBiy-mBeta) were prepared by a facile one-pot hydrothermal treatment approach and were characterized by XRD, N2 adsorption-desorption, TEM/SEM, XPS, H2-TPR, NH3-TPD and in situ DRIFTS. The catalysts CuxBiy-mBeta were applied to the removal of NOx by selective catalytic reduction with ammonia (NH3-SCR), especially the optimized Cu1Bi1-mBeta achieved the high efficiency for the removal of NOx and N2 selectivity, superior water and sulfur resistance as well as good durability. The excellent catalytic performance could be attributed to the acid sites of the support and the synergistic effect between copper and bismuth species. Moreover, in situ DRIFTS results showed that amides NH2 and NH4+ generated from NH3 adsorption could be responsible for the high selective catalytic reduction of NOx to N2. In addition, a possible catalytic reaction mechanism on Cu1Bi1-mBeta for the removal of NOx by NH3-SCR was proposed for explaining this catalytic process.

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“…15,16 Such transition metal ion species in the AlSCMS system may offer potential for specially tailored catalytic applications. 17 It is well-known that manganese oxide-loaded catalysts are useful as catalysts for various chemical reactions such as oxidation, [18][19][20] the catalytic combustion of methane 21 and volatile organic compound (VOC), 22 nitrous oxide decomposition 23 and ozone decomposition. 22 However, only a few papers have dealt with the local structural characteristics of the manganese metal ions in MCM-41 [24][25][26][27][28] and silica spheres with shell consisting of ordered mesoporous structure similar to MCM-41 hexagonal structure.…”

Section: Esr Study Of Manganese Ion Species With Solid Core/mesoporous Shell Structurementioning

confidence: 99%

Electron Spin Resonance Study of Manganese Ion Species Incorporated into Novel Aluminosilicate Nanospheres with Solid Core/Mesoporous Shell Structure

Back¹,

Kim²,

Kim³

et al. 2010

Journal of the Korean Magnetic Resonance Society

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An ion-exchanged reaction of MnCl 2 with Al-incorporated solid core/mesoporous shell silica (AlSCMS) followed by calcinations generated manganese species, where average oxidation state of manganese ion is 3+, in the mesoporous materials. Dehydration results in the formation of Mn 2+ ion species, which can be characterized by electron spin resonance (ESR). The chemical environments of the manganese centers in Mn-AlSCMS were investigated by diffuse reflectance, UV-VIS and ESR spectroscopic methods. Upon drying at 323 K, part of manganese is oxidized to higher oxidation state (Mn 3+ and Mn 4+ ) and further increase in (average) oxidation state takes place upon calcinations at 823 K. It was found that the manganese species on the wall of the Mn-AlSCMS were transformed to tetrahedral Mn 3+ or Mn 4+ and further changed to square pyramid by additional coordination to water molecules upon hydration. The oxidized Mn 3+ or Mn 4+ species on the surfaces were reversibly reduced to Mn 2+ or Mn 3+ species or lower valances by thermal process. Mn(II) species I with a well resolved sextet was observed in calcined, hydrated Mn-AlSCMS, while Mn (II) species II with g = 5.1 and 3.2 observed in dehydrated Mn-AlSCMS. Both species I and II are considered to be non-framework Mn(II).

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Flue gas denitrification. Selective catalytic oxidation of nitric oxide to nitrous oxide

Cited by 34 publications

References 0 publications

Catalytic Oxidation of NO over MnOx–CeO2 and MnOx–TiO2 Catalysts

Catalytic Oxidation of NO over MnOx–CeO2 and MnOx–TiO2 Catalysts

One-pot hydrothermal synthesis of CuBi co-doped mesoporous zeolite Beta for the removal of NOx by selective catalytic reduction with ammonia

Electron Spin Resonance Study of Manganese Ion Species Incorporated into Novel Aluminosilicate Nanospheres with Solid Core/Mesoporous Shell Structure

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