Activated alumina

About: Activated alumina is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 31090 citations.

Resin composition for inhibiting generation of chloride and method for inhibiting generation of chloride using the composition

Abstract: PROBLEM TO BE SOLVED: To provide a resin composition, which is able to efficiently inhibit generation of chlorides such as dioxins when combusted along with a chlorine- bearing polymer by adding a reducing agent to a resin base selected from a polyethylene resin, a polypropylene resin, a polystyrene resin and a polyester resin. SOLUTION: The resin composition for inhibiting generation of chlorides by adding 0.01 to 60 wt.% of a reducing agent to one or more resin bases selected from a resin base selected from a polyethylene resin, a polypropylene resin, a polystyrene resin and a polyester resin. An aluminium compound may be used in combination with the reducing agent. The reducing agent preferably includes hypophoshites or phosphites, and the aluminium compound preferably includes one or more members selected from aluminium phosphate, aluminium sulfate, aluminium hydroxide, aluminium oxide and activated alumina. The resin composition is added to a refuse in an amount of 1.0 to 90 wt.% and incinerated to inhibit generation of chlorides.

Production of honeycomb type oxidation catalyst for purification of internal combustion engine exhaust gas

Abstract: PURPOSE:To obtain a honeycomb type oxidation catalyst of long life and high activity for purification of exhaust gases from internal combustion engines by supporting a heavy metal and activated alumina on a specified carrier in a predetermined wt. ratio and specifying the thickness of the catalyst layer and the grain size distribution of the activated alumina fine powder used.

Preparation of integral structure type catalyst for purifying exhaust gas

Abstract: PURPOSE:To prepare the titled catalyst having excellent heat resistant durability and low temp. activity, by coating an integral structure type carrier with a slurry composition containing an activated alumina powder, a platinum group element compound and a cerium hydroxide powder. CONSTITUTION:An integral structure type carrier is coated with a slurry composition containing an activated alumina powder, a compound of at least one platinum group element and a cerium hydroxide powder. In this case, the support amount of the cerium hydroxide powder is set to 5-100g/l-catalyst as CeO2 and the particle size thereof is 0.1-0.8mum as a primary particle and 0.3-20mum as a secondary particle and the water content thereof is set to 40wt% or less. As a result, heat resistant durability is enhanced to a large extent as compared with a conventional catalyst using cerium nitrate and low temp. activity is also enhanced.

Preparation of catalyst for treating waste gas

Abstract: PURPOSE:To obtain the titled catalyst capable of efficiently removing CO, HC and NOx in a waste gas and having high temp. durability by a method wherein an integral structure type carrier is coated by a slurry of activated alumina containing perovskite type composite oxide of Al and a rare earth element and, after baking in air, a main catalytic metal is supported thereon. CONSTITUTION:A rare earth metal (e.g; Ce) is impregnated in activated alumina and the resulting impregnated alumina is baked in a reductive atmosphere to prepare activated alumina containing perovskite type composite oxide shown by a formula. Subsequently, the resulting activated alumina is pulverized and coated, in a slurry form, on an integral structure type carrier such as a honeycomb shape or the like and, after drying, said coated carrier is baked at 500-750 deg.C in air atmosphere. Next, the resulting carrier after baking is immersed in a solution of a noble metal salt (e.g.; platinum chloride) and, after drying, is baked at about 500-750 deg.C in air atmosphere to activate the supported noble metal to prepare an objective catalyst. Further, as the activated alumina of a starting material, a tablet, a sphere or an extrusion molded product of gamma-, delta- or eta-alumina are used.