CATALYTIC COMPOSITION AND METHOD OF REACTIVATION USED FOR ALKANE DEHYDROGENATION

文件类型：PDF文档
文件大小：421K
FIELD : chemistry. SUBSTANCE : catalytic composition for alkane dehydrogenation is described, comprising : metal of group IIIA selected from gallium, indium, thallium, and combinations thereof; noble metal of group VIII selected from platinum, palladium, rhodium, iridium, ruthenium, osmium and combinations thereof; at least, one additive selected from iron, chromium, vanadium, and combinations thereof; and an optional metal promoter selected from sodium, potassium, rubidium, cesium, magnesium, calcium, strontium, barium, and combinations thereof; on a catalyst carrier selected from silica, alumina, aluminosilicate composites modified with rare earths of alumina, and combinations thereof. A method for dehydrogenating alkane is also disclosed, comprising bringing the said catalyst composition into contact with alkane. The method of, at least, partial reactivating, at least, partially deactivated catalytic alkane dehydrogenation composition, comprises : treating, at least, partially deactivated the alkane dehydrogenation catalytic composition by exposing it to an oxygen-containing gas at a temperature of, at least, 660°C, wherein, at least, the partially deactivated alkane dehydrogenation catalytic composition comprises metal of group IIIA, noble metal of group VIII, an optional metal promoter, and an additive selected from iron, chromium, vanadium, and combinations thereof, on a catalyst support selected from silica, alumina, aluminosilicate composites, alumina modified with rare earths, and their combinations; so that the dehydrogenation activity of the alkanes of this, at least, partially deactivated catalyst composition of the alkane dehydrogenation is raised to such a level that upon contact with the selected alkane, it converts the selected alkane to a predetermined conversion percentage over a time that is reduced by, at least, 10 percent in comparison with the time necessary to increase the dehydrogenation activity of alkanes, other things being equal, as for the rest identical catalytic alkane dehydrogenation composition to the same level, where for the rest identical alkane dehydrogenation catalyst composition differs only in that it does not contain the same amount of the same additives. EFFECT : reducing the reactivation time with air purging compared to other identical catalysts, which in turn reduces costs in both material and technical resources and in investment. 9 cl, 8 ex, 3 tbl, 1 dwg