Asymmetric oxygen vacancy promotes CO-SCR performance on defect-engineered Rh/CeCuO catalyst.

Selective catalytic reduction of NO with CO (CO-SCR) is a process that purifies both NO and CO pollutants through a catalytic reaction. Specifically, the cleavage of NO on the catalyst surface is crucial for promoting the reaction. During the reaction, the presence of oxygen vacancies can extract oxygen from NO, thereby facilitating the cleavage of NO on the catalyst surface.

Novel framework-confined Cu@ 13X catalyst with excellent resistance to toxic SO as an eco-friendly substitute for hazardous V-based NH-SCR catalyst.

VO-WO/TiO (VWTi) catalyst has long been utilized in fixed source flue gases to purify harmful NO gas. However, VWTi is classified as a hazardous material because of its harm to human health and environment. To address this issue, a low-cost green Cu-based zeolite catalyst (Cu@13X) with a wide temperature range was synthesized using an in-situ hydrothermal method.

Essential features of weak current for excellent enhancement of NO reduction over monoatomic V-based catalyst.

Human society is facing increasingly serious problems of environmental pollution and energy shortage, and up to now, achieving high NH-SCR activity at ultra-low temperatures (<150 °C) remains challenging for the V-based catalysts with V content below 2%. In this study, the monoatomic V-based catalyst under the weak current-assisted strategy can completely convert NO into N at ultra-low temperature with V content of 1.36%, which shows the preeminent turnover frequencies (TOF = 1.

Transformation of waste battery cathode material LiMnO into efficient ultra-low temperature NH-SCR catalyst: Proton exchange synergistic vanadium modification.

It is essential to develop the catalyst for NH-SCR with excellent performance at ultra-low temperature (≤150 °C), and resource recycling is another important part of environmental protection. Based on the principle of environmental friendliness, the LiMnO, one of the waste battery cathode materials, was successfully modified into a novel high-value catalyst for ultra-low temperature NH-SCR through hydrogen ion exchange and two-dimensional vanadic oxide modification. The optimized LiMnO-0.

Enhanced Stability and Catalytic Performance of Active Rh Sites on AlO Via Atomic Layer Deposited ZrO.

Modulating the Rh active sites on surfaces of AlO is crucial to developing effective three-way catalysts. Herein, an ultralow amount of ZrO (0.0179%) was deposited onto AlO nanorods via atomic layer deposition (ALD) to form a catalyst with both thermal stability and low-temperature activity.

Atomic layer deposition of silica to improve the high-temperature hydrothermal stability of Cu-SSZ-13 for NH SCR of NO.

The improvement of stability is a crucial and challenging issue for industrial catalyst, which affects not only the service time but also the cost of catalyst. This is especially prominent for that applied in harsh environment atmospheres, such as the exhaust of diesel vehicles. Herein, we reported a new strategy to improve the high-temperature hydrothermal stability of Cu-SSZ-13, which is a promising catalyst for the treatment of exhaust emitted from diesel vehicles through the NH-SCR NO route.

In Situ Construction of Pt-Ni NF@Ni-MOF-74 for Selective Hydrogenation of p-Nitrostyrene by Ammonia Borane.

Pt-Ni nanoframes (Pt-Ni NFs) exhibit outstanding catalytic properties for several reactions owing to the large numbers of exposed surface active sites, but its stability and selectivity need to be improved. Herein, an in situ method for construction of a core-shell structured Pt-Ni NF@Ni-MOF-74 is reported using Pt-Ni rhombic dodecahedral as self-sacrificial template. The obtained sample exhibits not only 100 % conversion for the selective hydrogenation of p-nitrostyrene to p-aminostyrene conducted at room temperature, but also good selectivity (92 %) and high stability (no activity loss after fifteen runs) during the reaction.

A comparative study of MOx (M = Mn, Co and Cu) modifications over CePO catalysts for selective catalytic reduction of NO with NH.

The MO (M = Cu, Mn, Co)/CePO support was firstly prepared via the hydrothermal and impregnated method. Selective catalytic reduction of NO with NH (NH-SCR) results showed that the MnO modifications greatly improved the SCR activities at low temperatures. The NOx conversion of the MnO/CePO catalyst was above 80% even at 180 °C.

A general one-pot strategy for the synthesis of Au@multi-oxide yolk@shell nanospheres with enhanced catalytic performance.

By integrating redox self-assembly and redox etching processes, we report a general one-pot strategy for the synthesis of Au@multi-M O (M = Co, Ce, Fe, and Sn) yolk@shell nanospheres. Without any additional protecting molecule or reductant, the whole reaction is a clean redox process that happens among the inorganic metal salts in an alkaline aqueous solution. By using this method, Au@CoO/CeO (Au@Co-Ce), Au@CoO/FeO (Au@Co-Fe), and Au@CeO/SnO (Au@Ce-Sn) yolk@shell nanospheres with binary oxides as shells, Au@CoO/CeO/FeO (Au@Co-Ce-Fe) yolk@shell nanospheres with ternary oxides as shells and Au@CoO/CeO/FeO/SnO (Au@Co-Ce-Fe-Sn) yolk@shell nanospheres with quaternary oxides as shells can be obtained.

L-Arginine-Triggered Self-Assembly of CeO2 Nanosheaths on Palladium Nanoparticles in Water.

Pd@CeO2 core-shell nanostructures with a tunable Pd core size, shape, and nanostructure as well as a tunable CeO2 sheath thickness were obtained by a biomolecule-assisted method. The synthetic process is simple and green, as it involves only the heating of a mixture of Ce(NO3 )3 , l-arginine, and preformed Pd seeds in water without additives. Importantly, the synthesis is free of thiol groups and halide ions, thus providing a possible solution to the problem of secondary pollution by Pd nanoparticles in the sheath-coating process.

Investigation of the Redispersion of Pt Nanoparticles on Polyhedral Ceria Nanoparticles.

Redispersion of platinum nanoparticles (Pt NPs) on ceria is an important route for catalyst regeneration and antisintering. Here, we investigate the redispersion of Pt on ceria nanoparticles with defined surface planes including cubes ({100}) and octahedra ({111}). It is observed that Pt redispersion takes place only on ceria cubes in an alternating oxidation and reduction atmosphere.

An active-site-accessible porous metal-organic framework composed of triangular building units: preparation, catalytic activity and magnetic property.

An active-site-accessible porous metal-organic framework from self-assembling of trinuclear Cu(II) building units exhibits high CO oxidation activity and significant antiferromagnetic behavior.

Controllable anchoring of gold nanoparticles to polypyrrole nanofibers by hydrogen bonding and their application in nonenzymatic glucose sensors.

An enzymeless glucose biosensor based on polypyrrole nanofibers-supporting Au nanoparticles (Au/PPyNFs) was investigated in this study. The Au/PPyNFs heterogeneous composite materials were synthesized in-situ via hydrogen bonding interactions for the assembly of polyethyleneimine (PEI) on the surface of polypyrrole nanofibers (PPyNFs). By changing the molar ratio of PPy to HAuCl(4), Au/PPyNFs with different Au loadings were obtained.

Polyhedral 50-facet Cu2O microcrystals partially enclosed by {311} high-index planes: synthesis and enhanced catalytic CO oxidation activity.

Micro- and nanoparticles with high-index facets may exhibit higher chemical activities that are of great importance in practical applications. Cuprite is a potential alternative to expensive noble metals as the catalyst for CO oxidation at moderate temperatures. We report here a solution based approach to the preparation of unusual polyhedral 50-facet Cu2O microcrystals with a morphological yield higher than 70%.

Synthesis and evaluation of Gd-DTPA-labeled arabinogalactans as potential MRI contrast agents.

Arabinogalactan derivatives conjugated with gadolinium-diethylenetriaminepentaacetic acid (Gd-DTPA) by ethylenediamine (Gd-DTPA-CMAG-A2) or hexylamine (Gd-DTPA-CMAG-A6) have been synthesized and characterized by means of Fourier transform infrared spectra (FTIR), 13C nuclear magnetic resonance (13C NMR), size exclusion chromatography (SEC), and inductively coupled plasma atomic emission spectrometry (ICP-AES). Relaxivity studies showed that arabinogalactan-bound complexes possessed higher relaxation effectiveness compared with the clinically used Gd-DTPA, and the influence of the spacer arm lengths on the T1 relaxivities was studied. Their stability was investigated by competition study with Ca2+, EDTA, and DTPA.