Journal ArticleDOI
Extraordinary Deactivation Offset Effect of Arsenic and Calcium on CeO2–WO3 SCR Catalysts
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TLDR
The reasons for the gap of catalytic performance between fresh and As-Ca poisoned catalyst were proposed as follows: surface area decrease; crystalline WO3 particles generation; and oxygen defect sites irreversible loss.Abstract:
An extraordinary deactivation offset effect of calcium and arsenic on CeO2–WO3 catalyst had been found for selective catalytic reduction of NO with NH3 (NH3–SCR). It was discovered that the maximum NOx conversion of As–Ca poisoned catalyst reached up to 89% at 350 °C with the gaseous hourly space velocity of 120 000 mL·(g·h)−1. The offset effect mechanisms were explored with respect to the changes of catalyst structure, surface acidity, redox property and reaction route by XRD, XPS, H2-TPR, O2-TPD, NH3-TPD and in situ Raman, in situ TG, and DRIFTS. The results manifested that Lewis acid sites and reducibility originating from CeO2 were obviously recovered, because the strong interaction between cerium and arsenic was weakened when Ca and As coexisted. Meanwhile, the CaWO4 phase generated on Ca poisoned catalyst almost disappeared after As doping together, which made for Bronsted acid sites reformation on catalyst surface. Furthermore, surface Ce4+ proportion and oxygen defect sites amount were also restor...read more
Citations
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Journal ArticleDOI
Selective Catalytic Reduction of NOx with NH3 by Using Novel Catalysts: State of the Art and Future Prospects.
Lupeng Han,Sixiang Cai,Sixiang Cai,Min Gao,Jun-ya Hasegawa,Penglu Wang,Jianping Zhang,Liyi Shi,Dengsong Zhang +8 more
TL;DR: This review summarizes the latest SCR reaction mechanisms and emerging poison-resistant mechanisms in the beginning and subsequently gives a comprehensive overview of newly developed SCR catalysts, including metal oxide catalysts ranging from VOx, MnOx, CeO2, and Fe2O3 to CuO based catalysts.
Journal ArticleDOI
SO2-Tolerant Selective Catalytic Reduction of NOx over Meso-TiO2@Fe2O3@Al2O3 Metal-Based Monolith Catalysts
Lupeng Han,Min Gao,Jun-ya Hasegawa,Shuangxi Li,Yongjie Shen,Hongrui Li,Liyi Shi,Dengsong Zhang +7 more
TL;DR: This work supplies a new point for the development of low-temperature SO2-tolerant monolithic SCR catalysts with high N2 selectivity, which is of great significance for both academic interests and practical applications.
Journal ArticleDOI
Poisoning-Resistant NOx Reduction in the Presence of Alkaline and Heavy Metals over H-SAPO-34-Supported Ce-Promoted Cu-Based Catalysts.
Penglu Wang,Lijun Yan,Yundong Gu,Sanchai Kuboon,Hongrui Li,Tingting Yan,Liyi Shi,Dengsong Zhang +7 more
TL;DR: A novel H-SAPO-34-supported ceria-promoted copper-based catalyst that demonstrated exceptional resistance against alkali, alkaline earth, and heavy metal poisoning during SCR of NOx is reported here.
Journal ArticleDOI
High-Performance Ag-Cu Nanoalloy Catalyst for the Selective Catalytic Oxidation of Ammonia
Mingdong Zhou,Zhong Wang,Zhong Wang,Qiang Sun,Jingyun Wang,Chuanhui Zhang,Dan Chen,Xuebing Li +7 more
TL;DR: It has been found that O2 was more easily transformed from the adsorption state to the transition state than NH3, which enhanced the performance of NH3 oxidation.
Journal ArticleDOI
Unraveling the Unexpected Offset Effects of Cd and SO2 Deactivation over CeO2-WO3/TiO2 Catalysts for NOx Reduction
Lijun Yan,Fuli Wang,Penglu Wang,Sarawoot Impeng,Xiangyu Liu,Lupeng Han,Tingting Yan,Dengsong Zhang +7 more
TL;DR: Light is shed on deactivation mechanism of heavy metals and SO2 over CeO2-WO3/TiO2 catalysts and provides innovative pathway for inventing high-performance SCR catalysts, which have great resistance to heavy metal andSO2 simultaneously.
References
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Journal ArticleDOI
Chemical and mechanistic aspects of the selective catalytic reduction of NOx by ammonia over oxide catalysts: A review
TL;DR: In this paper, the open literature concerning chemical and mechanistic aspects of the selective catalytic reduction of NO by ammonia (SCR process) on metal oxide catalysts is reviewed, and the results of spectroscopic studies of the adsorbed surface species, adsorption-desorption measurements, flow reactor and kinetic experiments are analyzed.
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Identification of Neutral and Charged N x O y Surface Species by IR Spectroscopy
TL;DR: In this article, the infrared spectral performance of N x O y species observed on oxide surfaces [N2O, NO−, NO, (NO)2, N2O3, NO+, NO2 − (different nitro and nitrito anions), NO2, n2O4, N 2O5, NO2 and NO3 − (bridged, bidentate, and monodentate nitrates)] is considered.
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MnOx-CeO2 mixed oxides prepared by co-precipitation for selective catalytic reduction of NO with NH3 at low temperatures
TL;DR: In this paper, a series of manganese-cerium oxide catalysts were prepared by co-precipitation method and used for low temperature selective catalytic reduction of NO x with ammonia in the presence of excess O 2.
Journal ArticleDOI
Vanadium oxide monolayer catalysts Preparation, characterization and catalytic activity
TL;DR: A review of vanadium oxide monolayer catalysts can be found in this article, where the authors provide a guide to the recent literature on the preparation, structure and catalytic properties.
Journal ArticleDOI
Vanadia/Titania Catalysts for Selective Catalytic Reduction (SCR) of Nitric-Oxide by Ammonia: I. Combined Temperature-Programmed in-Situ FTIR and On-line Mass-Spectroscopy Studies
TL;DR: In this article, in situ FTIR and on-line mass spectrometric studies have provided simultaneous information of the surface adsorbed species on vanadia/titania catalysts and the composition of reaction products during the selective catalytic reduction (SCR) of NO.