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Journal ArticleDOI

Mechanistic investigation of the enhanced NH3-SCR on cobalt-decorated Ce-Ti mixed oxide: In situ FTIR analysis for structure-activity correlation

TLDR
In this article, a series of transition metals (Co, Cu and Fe) were selected to decorate Ce-Ti mixed oxide to elevate the low-temperature activity of selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) reaction.
Abstract
A series of transition metals (Co, Cu and Fe) were selected to decorate Ce-Ti mixed oxide to elevate the low-temperature activity of selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) reaction, by adjusting the ratio of surface Ce 3+ species and oxygen vacancies. Among them, Co-Ce-Ti sample exhibited the excellent low-temperature activity and broadened temperature window, which could be attributed to the improvement of the physico-chemical properties and the acceleration of the reactions in the Langmuir-Hinshelwood (L-H) and Eley-Rideal (E-R) mechanisms. Owing to the different ionic sizes of Co 2+ and Ce 4+ , the lattice distortion of Ce-Ti mixed oxide was greatly aggravated and subsequently increased the ratio of Ce 3+ and the surface adsorbed oxygen, which benefited the generation of adsorbed NO x species and improved the reaction in the L-H mechanism. Meanwhile, the coordinatively unsaturated cationic sites over the Co-Ce-Ti sample induced more Lewis acid sites and enhanced the formation of the adsorbed NH 3 species bounded with Lewis acid sites, which were considered as the crucial intermediates in E-R mechanism, and therefore facilitating the reaction between the adsorbed NH 3 species and NO molecules. The enhancements in both the reactions from L-H and E-R mechanisms appeared to directly correlated with the improved deNO x performance on the Co-Ce-Ti sample, and the L-H mechanism could be the dominate one at low temperatures due to its rapid reaction rate.

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Citations
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Journal ArticleDOI

Preparation of ZnS@In 2 S 3 Core@shell Composite for Enhanced Photocatalytic Degradation of Gaseous o -Dichlorobenzene under Visible Light

TL;DR: The novel ZnS@In2S3 core@shell hollow nanospheres fabricated by a facile refluxing method for the first time showed significantly enhanced catalytic performance for effective separation of photo-generated charges and would meet the demands for the control of persistent organic pollutant (POPs) in the atmospheric environment.
Journal ArticleDOI

Core-shell structure effect on CeO2 and TiO2 supported WO3 for the NH3-SCR process

TL;DR: In this article, a series of CeTi samples (CeO2/TiO2, TiO2@Ce O2, CeO 2/Ti OO 2, and CeO 2@TiO 2 ) were prepared and modified by tungsten.
Journal ArticleDOI

Mesoporous Mn–Ti amorphous oxides: a robust low-temperature NH3-SCR catalyst

TL;DR: In this article, a series of mesoporous Mn-Ti amorphous oxides (MnaTi1−a) fabricated by a combined strategy of in situ deposition and freeze-drying were studied for the selective catalytic reduction of NO with NH3 (NH3-SCR) at low temperature.
Journal ArticleDOI

Enhanced Fenton-like Oxidation of As(III) over Ce-Ti Binary Oxide: A New Strategy to Tune Catalytic Activity via Balancing Bimolecular Adsorption Energies.

TL;DR: This study provides a potent strategy to tune the catalytic activity of bimolecular chemisorption reactions by investigating Fenton-like oxidation of As(III) as a Chemisorbed model contaminant over a series of fabricated CexTi1-xO2 catalysts with tunable structures.
Journal ArticleDOI

Develop high efficient of NH3-SCR catalysts with wide temperature range by ball-milled method

TL;DR: In this article, a series of novel NH3-SCR catalysts with wide temperature range were developed via ball-milled method for selective catalytic reduction of NO by NH3, which exhibited good N2 selectivity and high poison resistance to SO2 and H2O in broad temperature window when compared to their original materials.
References
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Journal ArticleDOI

Semiconductor heterojunction photocatalysts: design, construction, and photocatalytic performances

TL;DR: This review attempts to summarize the recent progress in the rational design and fabrication ofheterojunction photocatalysts, such as the semiconductor-semiconductor heterojunction, the semiconductors-metal heterojunctions, the silicon-carbon heteroj junction and the multicomponent heteroj conjunction.
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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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Satellite structure in the X-ray photoelectron spectra of some binary and mixed oxides of lanthanum and cerium

TL;DR: In this paper, a study of the core-electron X-ray photoelectron (X-p) spectra of the f0 compounds La2O3, LaMO3(M = Fe and Co), CeO2, and BaCeO3 is described.
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Titanium-Defected Undoped Anatase TiO2 with p-Type Conductivity, Room-Temperature Ferromagnetism, and Remarkable Photocatalytic Performance

TL;DR: Using anatase TiO2, the most important and widely studied semiconductor, it is demonstrated that metal vacancies (VTi) can be introduced in undoped oxides easily, and the presence of VTi results in many novel physiochemical properties.
Journal ArticleDOI

Nickel-doped Mn/TiO2 as an efficient catalyst for the low-temperature SCR of NO with NH3: Catalytic evaluation and characterizations

TL;DR: In this article, a series of Mn-Ni/TiO 2 catalysts were prepared by adopting incipient wetness technique and investigated for low-temperature SCR of NO with NH 3 in the presence of excess oxygen.
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