Co-precipitation of CuZn(Al) precursor materials is the traditional way of synthesizing Cu/ZnO/(Al2O3) catalysts for industrial methanol synthesis. This process has been investigated by titration experiments of nitrate and formate solutions. It was found that the solidification of the single components proceeds sequentially in case of nitrates: Cu is precipitated at pH 3 and Zn (as well as Al) ...

We analyzed three kinds of information to evaluate the potential of forests in the Chesapeake Bay watershed to retain the nitrogen in atmospheric deposition. Long-term (13:~) measurements of nitrogen in precipitation and stream discharge for one forested watershed in the Inner Coastal Plain showed consistently high nitrogen retention. Annual wet precipitation deposited an averagk of U.4 kg N/ha...

A significant reduction in precipitation in the past decades has been documented over many mountain ranges such as those in central and eastern China. Consistent with the increase of air pollution in these regions, it has been argued that the precipitation trend is linked to the aerosol microphysical effect on suppressing warm rain. Rigorous quantitative investigations on the reasons responsibl...

Nanoscale precipitation is one of the most widely used microstructural tools to manipulate properties metallic alloys, and especially reach high strength. Optimal microstructures are reached through complex solid state phase transformations involving non-isothermal heat treatments, metastable phases, chemistry, non-equilibrium vacancies, interaction with structural defects. These controlled by ...

Rhodochrosite is the main Mn mineral phase in neutral to alkaline anoxic environments and is likely the initial precipitation phase when Mn is added to irrigation water. Solutions supersaturated with respect to rhodochrosite that was detected in various natural environments suggest that equilibrium assumptions may not be satisfactory and kinetic processes may be dominant. This study was conduct...

Efficient production of hydrogen peroxide (H2O2) from oxygen (O2) is an important research topic in chemistry. Au nanoparticles loaded on n-type semiconducting metal oxides by the deposition precipitation (DP) method...