In situ treatment by high-temperature water vapor as a novel health-care approach for commercial SCR catalyst
Source abstract
Abstract
Abstract Commercial selective catalytic reduction (SCR) catalysts used in a 1000 MW coal-fired power plant were in situ treated by high-temperature water vapor. The de-NOx efficiency of the deactivated catalyst increased about 25–30%, comparable to fresh commercial SCR catalysts, after being treated with simulated flue gas with 15–20 vol% high-temperature water vapor. It indicates that treatment by in situ 15–20 vol% high-temperature water vapor could significantly extend the lifetime of commercial SCR catalyst. High-temperature water vapor could remove Fe, Na, Ca, sulphate species and SiO2 depositing on SCR catalyst. Compared with the deactivated catalyst, the specific surface area, the ratio of V4+/V5+ and Lewis acid content of health-care catalyst increased from 41.679 to 44.596 m2·g−1, 1.35 to 1.80 and 45.5 to 73.8%, respectively. Density functional theory (DFT) calculation demonstrated that the electrons transferred from H2O molecule to V5+ cations in the process of H2O adsorption and the subsequent hydroxylation of V5+cations during H2O dissociation contribute to the reduction of V5+ to V4+ on the SCR catalyst.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Catalytic Processes in Materials Science · Catalysis and Oxidation Reactions · Industrial Gas Emission Control
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (55)
Show source-provided references
1. Improvement of activity, selectivity and H2O&SO2-tolerance of micromesoporous CrMn2O4 spinel catalyst for low-temperature NH3-SCR of NOx10.1016/j.apsusc.2018.09.227 ↗
2. Silicotungstic acid modified Ce-Fe-Ox catalyst for selective catalytic reduction of NOx with NH3: Effect of the amount of HSiW
3. The role of surface properties of silicotungstic acid doped CeO2 for selective catalytic reduction of NOx by NH3: Effect of precipitant10.1016/j.molcata.2015.12.009 ↗
4. Mechanisms study of silicotungstic acid modified CeO2 catalyst for selective catalytic reduction of NOx with NH3: Effect of pH values10.1016/j.jtice.2018.05.018 ↗
5. The role of molybdenum on the enhanced performance and SO2 resistance of V/Mo-Ti catalysts for NH3-SCR10.1016/j.apsusc.2019.03.118 ↗
6. Relationship between the WO3 states and reaction pathway over CeO2-ZrO2-WO3 catalysts for selective catalytic reduction of NO with NH3
7. Deactivation mechanism of de-NOx catalyst (V2O5-WO3/TiO2) used in coal fired power plant10.1016/S1872-5813(13)60003-1 ↗
8. Effect of vanadium toxicity at its different oxidation states on selected bacterial and protozoan isolates in wastewater systems10.1080/09593330.2014.893023 ↗
9. A promising approach to recover a spent SCR catalyst: Deactivation by arsenic and alkaline metals and catalyst regeneration10.1016/j.cej.2017.12.132 ↗
10. Alkali deactivation of high-dust SCR catalysts used for NOx reduction exposed to flue gas from 100 MW-scale biofuel and peat fired boilers: Influence of flue gas composition10.1016/j.apcatb.2006.03.022 ↗
11. Deactivation and regeneration of a commercial SCR catalyst: Comparison with alkali metals and arsenic10.1016/j.apcatb.2014.12.005 ↗
12. The poisoning effect of Na+ and Ca2+ ions doped on the V2O5/TiO2 catalysts for selective catalytic reduction of NO by NH310.1016/j.apcatb.2009.10.022 ↗
13. Regeneration of commercial TiO2-V2O5-WO3 SCR catalysts used in bio fuel plants10.1016/S0926-3373(00)00227-7 ↗
14. Regeneration of deactivated commercial SCR catalyst by alkali washing10.1016/j.catcom.2013.05.010 ↗
15. Deactivation mechanism and feasible regeneration approaches for the used commercial NH3-SCR catalysts10.1080/09593330.2015.1088070 ↗
16. A novel method of microwave heating mixed liquid-assisted regeneration of V2O5-WO3/TiO2 commercial SCR catalysts10.1007/s10653-014-9663-y ↗
17. Regeneration of commercial SCR catalysts by washing and sulphation: effect of sulphate groups on the activity10.1016/S0926-3373(01)00193-X ↗
18. Effect of water on the kinetics of nitric oxide reduction over a high-surface-area V2O5/TiO2 catalyst10.1016/0926-3373(94)80001-4 ↗
19. Reactivity of V2O5 catalysts for the selective catalytic reduction of NO by NH3: influence of vanadia loading, H2O, and SO210.1006/jcat.1996.0182 ↗
20. Effect of water vapor on the selectivity in the reduction of nitric oxide with ammonia over vanadia supported on silica-titania10.1016/0166-9834(91)80092-B ↗
21. The influence of sulfur dioxide and water on the performance of a marine SCR Catalyst10.1016/j.apcatb.2011.09.010 ↗
22. Influence of water on the reactivity of vanadia/titania for catalytic reduction of NOx10.1016/0021-9517(92)90358-O ↗
23. An all-electron numerical method for solving the local density functional for polyatomic molecules10.1063/1.458452 ↗
24. From molecules to solids with the DMol3 approach10.1063/1.1316015 ↗
25. Generalized gradient approximation made simple10.1103/PhysRevLett.77.3865 ↗
26. A generalized synchronous transit method for transition state location10.1016/S0927-0256(03)00111-3 ↗
27. A climbing image nudged elastic band method for finding saddle points and minimum energy paths10.1063/1.1329672 ↗
28. Role of WO3 in the Hg oxidation across the V2O5-WO3-TiO2 SCR catalyst: A DFT study10.1021/jp407794g ↗
29. DFT Study of Hg oxidation across vanadia-titania SCR catalyst under flue gas conditions10.1021/jp310668j ↗
30. Water effect on the electronic structure of active sites of supported vanadium oxide catalyst VOx/TiO2(001)10.1021/jp911145c ↗
31. Theoretical study of the effect of (001) TiO2 anatase support on V2O510.1021/jp910685z ↗
32. Single and combined deactivating effect of alkali metals and HCl on commercial SCR catalysts10.1016/j.apcatb.2004.01.007 ↗
33. H2O and/or SO2 tolerance of Cu-Mn/SAPO-34 catalyst for NO reduction with NH3 at low temperature10.3390/catal9030289 ↗
34. Laboratory investigation of selective catalytic reduction catalysts: deactivation by potassium compounds and catalyst regeneration10.1021/ie030404a ↗
35. The pilot demonstration of a honeycomb catalyst for the DeNOx of low-temperature flue gas from an industrial coking plant10.1016/j.fuel.2018.01.048 ↗
36. Influence of SiO2 on MiTiO2 (M = Cu, Mn, and Ce) formulations for low-temperature selective catalytic reduction of NOx with NH3: Surface properties and key Components in relation to the activity of NOx reduction10.1021/ie504709j ↗
37. Insight into deactivation of commercial SCR catalyst by arsenic: an experiment and DFT study10.1021/es503486w ↗
38. In situ regeneration of commercial NH3-SCR catalysts with high-temperature water vapor10.1016/j.catcom.2018.08.009 ↗
39. The effects of tungsten and hydrothermal aging in promoting NH3-SCR activity on V2O5/WO3-TiO2 catalysts10.1016/j.apsusc.2018.08.046 ↗
40. Promoted V2O5/TiO2 catalysts for selective catalytic reduction of NO with NH3 at low temperature10.1016/j.apcatb.2015.10.044 ↗
41. Active sites evaluation of vanadia based powdered and extruded SCR catalysts prepared on commercial titania10.1007/s10562-015-1511-x ↗
42. V2O5/WO3-TiO2 catalysts under thermal stress: responses of structure and catalytic behavior in the selective catalytic reduction of NO by NH310.1016/j.apcatb.2017.06.006 ↗
43. Comparison of support synthesis methods for TiO2 and the effects of surface sulfates on its activity toward NH3-SCR10.1039/C8NJ04363A ↗
44. Enhancement of SCR activity and SO2 resistance on VOx/TiO2 catalyst by addition of molybdenum10.1016/j.cej.2015.08.152 ↗
45. Surface lattice oxygen activation via Zr4+ cations substituting on A2+ sites of MnCr2O4 forming ZrxMn1-xCr2O4 catalysts for enhanced NH3-SCR performance10.1016/j.cej.2019.122397 ↗
46. Acid-promoter-free ethylene methoxycarbonylation over Ru-clusters/ceria: The catalysis of interfacial Lewis acid-base Pair10.1021/jacs.8b01742 ↗
47. Low-temperature methane combustion over Pd/H-ZSM-5: Active Pd Sites with Specific Electronic Properties Modulated by Acidic Sites of H-ZSM-510.1021/acscatal.6b01801 ↗
48. Present status and perspectives in De-NOx SCR catalysis10.1016/S0926-860X(01)00832-8 ↗
49. Synergy of KCl and Hg el on selective catalytic reduction of NO with NH3 over V2O5-WO3/TiO2 catalysts10.1016/j.cej.2014.12.038 ↗
50. Ni-Mn bi-metal oxide catalysts for the low temperature SCR removal of NO with NH310.1016/j.apcatb.2013.10.049 ↗
51. An EPR study of the surface chemistry of the V2O5-WO3/TiO2 catalyst: Redox behaviour and state of V(IV)10.1006/jcat.1997.1492 ↗
52. Deactivation of vanadia-based commercial SCR catalysts by polyphosphoric acids10.1016/j.apcatb.2008.02.008 ↗
53. Comparative study of the poisoning effect of NaCl and Na2O on selective catalytic reduction of NO with NH3 over V2O5-WO3/TiO2 catalyst10.1016/j.joei.2018.07.002 ↗
54. Molecular and dissociative adsorption of water at low-index V2O5 surfaces: DFT studies using cluster surface models10.1016/j.molcata.2010.04.004 ↗
55. Reactivity and physicochemical characterisation of V2O5-WO3/TiO2 De-NOx catalysts10.1006/jcat.1995.1193 ↗