Introduction Nitrogen oxides (NOx) cause the photochemical smog, acid rain, ozone depletion and greenhouse effect. Therefore, a great deal of studies has been performed to reduce NOx by using various catalytic systems such as selective catalytic reduction (SCR) or NOx storagereduction catalyst. Recently, N2O, whose greenhouse effect is 310 times larger than CO2, has been issued due to the new r...

Heavy metal impregnation of specimens for electron microscopy offers a means for differential "staining" of various tissue components and cellular constituents. Of many silver impregnation methods, one of the most useful is Gomori's silver methenamine (1) after periodic acid oxidation (PA-SM) (2, 3). Several authors have applied silver impregnation to electron microscopy (4-7), mainly for the d...

An alumina-supported nickel catalyst was prepared by impregnation of Ni2+ solution onto mesoporous alumina under microwave irradiation (denoted as M-Ni/Al2O3). For comparison, a catalyst with the same nickel content was prepared by conventional impregnation method (denoted as UM-Ni/Al2O3). Both M-Ni/Al2O3 and UM-Ni/Al2O3 catalysts were applied to the syngas (H2 + CO) production by methane oxy-s...

CuCe mixed oxide is one of the most studied catalytic systems for preferential CO oxidation (CO-PrOx) purification hydrogen-rich gas stream. In this study, a series ceria supports were prepared via citrates-hydrothermal route by altering synthesis parameters (concentration and temperature). The resulting used preparation mixed-oxide catalysts wet impregnation. Various physicochemical techniques...

The catalytic activity for CO oxidation over cerium dioxide (CeO2) and Cu-modified ceria (Cu/CeO2) powders prepared by wetness impregnation method was investigated in flow tube reactor system under atmospheric pressure. Reaction curves of powder samples pre-treated by calcination in mixture of argon and oxygen and by reduction in hydrogen, all at 300 °C were measured. X-ray photoelectron spectr...

A few years ago, when officiating as civil surgeon in ODe of the stations of the North-West-Provinces, I was asked to prescribe for a lady whose prevailing and prominent symptom was sickness. It was unceasing. Exaggerated in the morning it continued throughout the day. At night only, when my patient slept, was relief experienced. She had been married a few months. I pronounced her to be pregnan...

Mn-Co-based catalysts were loaded to ceramic filters element by impregnation for the coprocessing of dust and nitrogen oxide (NOx) in flue gas. The influence Mn/Co ratio loading on catalytic performance was investigated. filter with a molar 2/1 can achieve 99% NO conversion selective reduction NOx NH3 (NH3-SCR) temperature range 100−180 °C, but its resistance H2O relatively poor. modified PTFE ...