Topic
Activated alumina
About: Activated alumina is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 31090 citations.
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Patent•
11 Apr 1995
TL;DR: In this article, a catalytic component is at least one kind selected from platinum-group metals, the alumina is formed of the mixed-phase alumina having theta and alpha phases and with the alpha-conversion rate R controlled to 0.5
Abstract: PURPOSE:To more efficiently purge NOx in a wide exhaust gas temp. range by forming alumina of a mixed-phase alumina with the alpha-conversion rate specified. CONSTITUTION:This exhaust gas purifying catalyst consists of alumina and a catalytic metal depositing on the alumina. The catalytic component is at least one kind selected from platinum-group metals, the alumina is formed of the mixed-phase alumina having theta and alpha phases and with the alpha-conversion rate R controlled to 0.5<=R<=95%. The mixed-phase alumina is obtained by heat-treating activated alumina at 800-1100 deg.C to cause change of phase. When the catalytic metal is deposited on the mixed-phase alumina, the dispersibility of the metal is suppressed as compared with the activated alumina, and the catalyst oxidizes HC weakly. Thus, HC is partially oxidized to form active CHO in a wide exhaust gas temp. range, NOx are reduced and purged by the active CHO, and the purification temp. range is widened.
3 citations
TL;DR: The rearrangement of 1,3-bromochloropropane (BCP) on activated alumina was carried out at 160 − 280°C as mentioned in this paper.
Abstract: The rearrangement of 1,3-bromochloropropane (BCP) on activated alumina was carried out at 160 – 280°C. This reaction proceeded as follows. Br(CH2)3Cl \leftrightarrows Br(CH2)3Br + Cl(CH2)3Cl It was suggested that the acidic sites of alumina played an important role in the rearrangement of halogen atom.
3 citations
Patent•
14 Jul 1975TL;DR: Ferric chloride is removed from gas streams containing the same by passing the stream through a bed of activated alumina impregnated with potassium chloride or sodium chloride as discussed by the authors, which is known as activated aluminates.
Abstract: Ferric chloride is removed from gas streams containing the same by passing the stream through a bed of activated alumina impregnated with potassium chloride or sodium chloride.
3 citations
Patent•
01 Mar 1986
TL;DR: In this paper, a method of hydrocracking liquefied coal was proposed to suppress the deposition of a carbonaceous substance on a catalyst, by conducting the hydro-cracking of coal in the presence of a specific catalycracking catalyst, where an activated alumina powder was mixed with water and a forming assistant (e.g. nitric acid or a basic nitrogen compound) and, if necessary, 10-120wt% of carbon black.
Abstract: PURPOSE:To provide a method of hydrocracking liquefied coal which enables the hydrocracking to be continuously conducted for a long period of time with excellent catalytic activity and selectivity while suppressing the deposition of a carbonaceous substance on a catalyst, by conducting the hydrocracking of liquefied coal in the presence of a specific hydrocracking catalyst. CONSTITUTION:An activated alumina powder such as gamma-alumina or an activated alumina precursor powder such as a hydrated alumina powder, e.g. boehmite powder is mixed with water and a forming assistant (e.g. nitric acid or a basic nitrogen compound) and, if necessary, 10-120wt% of carbon black. The mixture is formed into a spherical shape having a diameter of 0.5-3mm or a cylindrical shape having a diameter of 0.5-3mm and dried. The product is calcined at 500-1,000 deg.C for 1hr to 1 day to obtain a (porous) activated alumina to be used as a supporting material. On the activated alumina are supported 1-50% (by weight in terms of oxide; the same applies hereinafter) of a metal belonging to Group VI A of the periodic table and 0.1-20% of Ni or Co, or 0.01-10% (in terms of metal) of a platinum group metal etc. to obtain a hydrocracking catalyst. A liquefied coal which has been obtained as a secondary hydrocracking reaction product of a two-stage hydrocracking reaction of coal is decomposed to make more volatile in the presence of the hydrocracking catalyst under an H2 pressure of 50-300kg/cm G at a temperature of 250-500 deg.C and a liquid space velocity of 0.1-5hr .
3 citations
Patent•
08 Dec 1995
TL;DR: An HCl adsorbent, and method of making and using the adaption is described in this article, where an activated alumina is promoted with an alkali metal in an amount such that if calculated as a metal oxide, it contains at least about 5% by weight of the metal.
Abstract: An HCl adsorbent, and method of making and using the adsorbent, the adsorbent comprising an activated alumina promoted with an alkali metal in an amount such that if calculated as alkali metal oxide, the adsorbent contains at least about 5% by weight alkali metal oxide.
3 citations