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24.382  Articles
1 of 2.439 pages  |  10  records  |  more records»
The influence of surface physical-chemical characteristics of Chilean natural zeolite on the catalytic ozonation of toluene is presented in this article. Surface characteristics of natural zeolite were modified by acid treatment with hydrochloric acid and... see more

Mesoporous HZSM-5 prepared by alkaline treatment (also termed desilication) has drawn significant attention due to its potential in large-scale production and in versatile applications, such as separation and catalysis. Alkali-treated HZSM-5 contains cons... see more

Neste artigo, analiso a concepção das leis da natureza denominada regularismo. O regularismo é definido aqui como uma versão de antirrealismo nomológico, isto é, a posição segundo a qual a fundamentação das leis da natureza deve ser feita mediante conside... see more

Studies of the Lewis Acid (AlCl3 and BF3-methanol) to isoeugenol and isoeugenyl acetate have been conducted. Reactions were carried out by stirring of isoeugenol and isoeugenyl acetate for 4 days at room temperature.Structure analysis of the products usin... see more

In this study, sol-gel method using egg white as emulsifying agent was applied to prepare nano size spinel NixFe3-xO4 (with x = 0.2–1). Sample preparation was carried out by mixing the solution of Fe(NO3)3.9 H2O and Ni(NO3)3.6 H2O with egg white, and then... see more

The abundance of glycerol as the side product of biodiesel has motivated researches on glycerol utilization as a feedstock for more valuable products. This research presents the possibility of producing polyester (glyptal), which is a widely used coating ... see more

Vicinal halo amines constitute an important class of compounds due to their diverse biological activity and a broad application as synthones in the production of pharmaceutical agents. The reaction of aryl- and alkylsulfonamides with 1,2-dibromo-2-phenyle... see more

Lewis acid nature of SnCl4 and n-Bu2SnCl2 has been studied using 3-methyl-1-indanone. The equilibrium constant has been calculated for both the tin moieties. It has been found that Lewis acid character of SnCl4 is fourteen times greater than that of n-Bu2... see more

The application of universal theory of M.I. Usanovich in science and education is presented in this paper. On the basis of the ionic theory of Arrhenius is considered the degree of dissociation, the constant dissociation, pH value and the equilibrium of c... see more

1 of 2.439 pages  |  10  records  |  more records»