Low-temperature selective catalytic reduction of NO with NH₃ over nanoflaky MnOx on carbon nanotubes in situ prepared via a chemical bath deposition route

Design of multi-shell Fe2O3@MnO(x)@CNTs for the selective catalytic reduction of NO with NH3: improvement of catalytic activity and SO2 tolerance

Manganese based catalysts are highly active in the NH3-SCR reaction for NOx removal. Unfortunately, manganese oxides can be easily deactivated by sulfur dioxide in the flow gas, which has become the main obstacle for their practical applications. To address this problem, we presented a green and facile method for the synthesis of multi-shell Fe2O3@MnOx@CNTs. The morphology and structural properties of the catalysts were systematically investigated. The results revealed that the MnOx@CNT core-shell structure was formed during the chemical bath deposition, while the outermost MnOx species were transformed to Fe2O3 after the galvanic replacement reaction. The formation of the multi-shell structure induced the enhancement of the active oxygen species, reducible species as well as adsorption of the reactants, which brought about excellent de-NOx performance. Moreover, the Fe2O3 shell could effectively suppress the formation of the surface sulfate species, leading to the desirable SO2 resistance to the multi-shell catalyst. Hence, the synthesis protocol could provide guidance for the preparation and elevation of manganese based catalysts.

Low-temperature selective catalytic reduction of NOx with NH3 over a manganese and cerium oxide/graphene composite prepared by a hydrothermal method

MnO_x–CeO₂/graphene catalysts prepared by a hydrothermal method exhibited excellent NH₃-SCR activity and strong resistance against SO₂, which is very competitive for practical application in controlling NO_x emission from flue gas.

The enhanced performance of a CeSiOx support on a Mn/CeSiOx catalyst for selective catalytic reduction of NOx with NH3

A series of Mn/CeSiO_x catalysts were prepared by the wet impregnation method and used for selective catalytic reduction of NO with NH₃.

Deactivation of Mn/TiO2 catalyst for NH3-SCR reaction: effect of phosphorous

The deactivation mechanism of phosphorous on a Mn/TiO₂ catalyst for selective catalytic reduction of NO with NH₃ was investigated in this study.

Structure–performance relationships of MnO2 nanocatalyst for the low-temperature SCR removal of NOX under ammonia

To investigate the corresponding relationship between catalytic efficiency and structure, MnO₂ nanomaterials (nanospheres, nanosheets, nanorods) have been prepared successfully, and were thoroughly characterized by SEM and TEM.

MnO2 doped CeO2 with tailored 3-D channels exhibits excellent performance for NH3-SCR of NO

Due to a high surface area and 3-D meso-channels, the catalyst exhibits high performance for NH₃-SCR of NO.

Effects of preparation conditions on Mn-based activated carbon catalysts for desulfurization

Ultrasonic oscillation cannot change the formation of Mn oxides and types of functional groups, but calcination temperatures are key factors.

Synthesis, characterization and catalytic performances of Cu- and Mn-containing ordered mesoporous carbons for the selective catalytic reduction of NO with NH3

The synergetic catalytic effect of Cu and Mn for CuxMny-OMCs catalysts on NO conversion with NH₃.

Fabrication of Mn–CeOx/CNTs catalysts by a redox method and their performance in low-temperature NO reduction with NH3

Highly active Mn–CeO_x/CNTs catalysts were first fabricated by a novel redox method, and a formation mechanism was proposed.

Rational design of 3D hierarchical foam-like Fe2O3@CuOxmonolith catalysts for selective catalytic reduction of NO with NH3

A high-performance monolith catalyst based on 3D hierarchical foam-like Fe₂O₃@CuO_xwas developed for selective catalytic reduction of NO.

Porous Ni-Mn oxide nanosheets in situ formed on nickel foam as 3D hierarchical monolith de-NO(x) catalysts

In this work, we successfully in situ decorated nickel foam with porous Ni-Mn oxide nanosheets (3DH-NM/NF) as 3D hierarchical monolith de-NOx catalysts via a simple hydrothermal reaction and calcination process. The catalysts were carefully examined by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, elemental mapping, X-ray photoelectron spectroscopy, H2 temperature-programmed reduction and NH3 temperature-programmed desorption measurements. The results indicated that the nanosheets are composed of a Ni6Mn1O8 spinel and the metal species are uniformly dispersed in bi-metal oxides. As a result, the strong synergistic effects between the Mn and Ni species have been observed. The active oxygen species, reducible species and acidity are enhanced by the in situ formation of the nanosheets on the surface of nickel foam. These desirable features of 3DH-NM/NF catalysts bring about the excellent de-NOx performance. Moreover, the 3DH-NM/NF catalysts also present good stability and H2O resistance. Based on these favorable properties, 3DH-NM/NF could be considered as a promising candidate for the monolith de-NOx catalysts.

Fabrication and properties of lightweight ZrB2 and SiC-modified carbon bonded carbon fiber composites via polymeric precursor infiltration and pyrolysis

The lightweight UHTC-modified CBCF composites were prepared by PIP using B and Zr polymeric precursor. The mechanical properties, thermo properties and oxidation behavior were studied. They are important considerations for potential use in thermal protection system applications.