Manganese (Mn) oxides are among the most reactive sorbents and oxidants within the environment, where they play a central role in the cycling of nutrients, metals, and carbon. Recent discoveries have identified superoxide ([Formula: see text]) both of biogenic and abiogenic origin as an effective oxidant of Mn(II) leading to the formation of Mn oxides. Here we examined the conditions under whic...

in this study the performance and emissions characteristics of a heavy-duty, direct injection, compression ignition (ci) engine which is specialized in agriculture, have been investigated experimentally. for this aim, the influence of injection timing, load, engine speed on power, brake specific fuel consumption (bsfc), peak pressure (pp), nitrogen oxides (nox), carbon dioxide (co2), carbon mon...

background diatomite coated by nanoparticles of copper and zinc mixed oxides were used to investigate catalytic oxidation of carbon monoxide. objectives aim of this paper was to investigatediatomite performance as a supporting host to confine the cuo and zno nanoparticles and its catalytic activity for carbon monoxide oxidation. materials and methods the prepared catalysts were characterized by...

A new approach for enhancing the electrochemical performance of carbon felt electrodes by employing non-precious metal oxides is designed. The outstanding electro-catalytic activity and mechanical stability of Mn(3)O(4) are advantageous in facilitating the redox reaction of vanadium ions, leading to efficient operation of a vanadium redox flow battery.

Air pollutant gases include ground-level ozone, carbon monoxide, sulfur dioxides and nitrogen oxides, particulate matter, organic compounds, including polycyclic aromatic hydrocarbons and endotoxins, and metals [1]. Nitrogen is released during fuel combustion and combines with oxygen atoms in the atmosphere to produce nitric oxide and other nitrogen oxides, which can be inhaled by the upper res...

Oxidation of azafulleroids with peracids regenerated C60 depending on the N-substituents. Alkyl-substituted azafulleroids preferred the oxidation of nitrogen to afford N-oxides as possible intermediates for C60 in moderate yields. Phenyl- and tosyl-substituted azafulleroids rather allowed the oxidation at the carbon cage. Theoretical calculations predicted the order of reactivity of azafulleroi...

Functional nanomaterials (e.g., nanowires, nanotubes, graphene, metal oxides, carbon nanostructures, large band gap semiconductors, and metals) with new sensing properties (e.g., ppblevel detection, high sensitivity, selectivity) that are self-heating and provide durable operation for low-power devices (tens of μW to tens of mW) are key elements for adequate air-quality measurement at indoor an...