Showing papers on "Activated alumina published in 1984"

Process for hydrotreating metal containing oil fractions using a supported catalyst of increased resistance to poisons

Abstract: A process for hydrotreating hydrocarbons uses a catalyst which comprises a carrier and at least one catalytic metal selected from vanadium, molybdenum, tungsten, nickel, cobalt and/or iron; this catalyst is in the form of a plurality of juxtaposed agglomerates of acicular platelets, oriented radially to each other. It is prepared from agglomerates of activated alumina subjected to reaction with an acid and a compound providing an anion able to combine with aluminum ions in solution.

Methanol reforming catalyst

Abstract: PURPOSE:To enhance the durability of the titled catalyst, by supporting at least one catalytic metal among Pt and Pd and Ce-oxide, of which the greater part is occupied by oxide of tetravalent Ce, by inorg. oxide based on activated alumina. CONSTITUTION:In a methanol reforming catalyst wherein at least one of Pt and Pd is supported by a carrier formed by adhering Ce-oxide to inorg. oxide based on activated alumina, the greater part of Ce-oxide is formed of oxide of tetravalent Ce. The adhesion amount of oxide of tetravalent Ce in this catalyst is pref. set to 0.1-10wt%. The supporting amount of Pt is pref. 0.1-1.0wt% and that of Pd is pref. 0.2-1.0wt%. This catalyst is extremely enhanced in durability.

Manufacture of calcium aluminate monosulfate hydrate

Abstract: PURPOSE:To obtain a product of high purity having a uniform particle form and grain size by carrying out wet pulverization of a mixture of starting materials for making above-mentioned compd. in the manufacture by allowing said mixture to react hydrothermally. CONSTITUTION:Limestone, slaked lime, alumina, activated alumina, alumina hydrate, CaSO4 and aluminum sulfate are blended so as to have approximately stoichiometric ratio of calcium aluminate monosulfate hydrate (MSH). This mixture of starting materials is mixed with water to produce ettringite. By carrying out wet pulverization of the slurry with a ball mill or the like, particles of ettringite and unreactive starting materials are pulverized finely to <=80mu grain size. After wet pulverization, the synthesis of MSH is carried out by a hydrothermal reaction.

Formation of porous alumina coating film on inorganic carrier

Abstract: PURPOSE:To form marcropores, by applying slurry containing activated alumina onto the surface of an inorganic carrier, freeze-thawing said carrier and then baking it. CONSTITUTION:In forming macropores on the surface of an inorganic carrier of cordierite or ceramics, activated alumina such as gamma, delta or theta alumina after being kneaded with aluminum hydroxide hydrate, nitric acid, acetic acid, etc. is applied onto the surface of said inorganic carrier. Then, the carrier is freezed and vacuum dried. Hence, the coagulation of activated alumina particles can be inhibited, and uniform cavities three-dimensionally connected with each other from the inner part to the entire surface of the coating layer can be formed.

Catalyst carrier for purifying exhaust gas

Abstract: PURPOSE: To enhance purification efficiency, by using a catalyst carrier formed by providing an activated alumina layer, which contains oxide based on Ln 2 O 3 (Ln: an elememt of a La-series) wherein carbon dioxide is penetrated between rare earth element ions showing 7-coordination, to the surface of refractory oxide. CONSTITUTION: Carbonate such as ammonium carbonate and oxide or hydroxide of a rare earth element are mixed and baked at 250W650°C to obtain Ln 2 O 3 having CO 2 penetrated thereinto. This Ln 2 O 3 is applied to oxide such as γ- alumina having a specific surface area of 20m 2 /g or more so as to coat the surface thereof. Ln 2 O 3 is pref. contained in the coating layer in an amount of 0.07mol or more as Lanthanum. By this method, catalytic activity at a low temp. can be enhanced. COPYRIGHT: (C)1985,JPO&Japio

Removal of phosphorus in water

Abstract: PURPOSE: To efficiently adsorb the phosphorus component in water by a specific adsorbent, by contacting water with a chemical adsorbent wherein a specific amount of Al 2 O 3 is contained and a specific amount of an Al-salt or iron salt is supported by an inorg. porous substrate having a specific pore size. CONSTITUTION: At least one of an Al-salt (e.g., aluminum sulfate) or iron salt (e.g., ferric sulfate) is supported by an inorg. porous substrate (e.g., activated alumina), wherein the content of Al 2 O 3 is 30wt% or more and the volume of fine pores with a pore size of 2W30nm is 0.15ml/g or more, in an amount of 5×10 -5 W1×10 -3 mol per 1g of the substrate to prepare a chemical adsorbent. This chemical adsorbent is contacted with water containing a phosphorus component to adsorb said phosphorus component. As a result, phosphorus can be removed in a wide concn. range without requiring complicated control. This adsorbent is especially suitable for removing phosphorus from an intermediate and small scale living waste water and industrial waste water. COPYRIGHT: (C)1986,JPO&Japio

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.

Catalyst for removing fine particles in diesel exhaust gas

Abstract: PURPOSE:To obtain the titled catalyst with high efficiency, by a method wherein the surface of a porous carrier having a three-dimensional network structure is coated with activated alumina and Pd is supported by the coated carrier while one element selected from Rh, Ru, Ni, Zn and Ti is further supported thereby. CONSTITUTION:The surface of a porous carrier having a three-dimensional network structure (e.g., cordierite type ceramics) is coated with activated alumina in an amount of 20-200g per 1l of the carrier. Pd is supported by this catalyst carrier in an amount of 0.05-3g per 1l of the catalyst carrier while at least one element selected from Rh, Ru, Ni, Zn and Ti is further supported. By using this catalyst, the removal ratio of a particulate in diesel exhaust gas becomes high and the formation of sulfate is reduced while the rising in pressure loss is low and, therefore, the catalyst extremely high in practical peformance is obtained.

Carrier of catalyst for hydrogen treating heavy hydrocarbon residue oil

Abstract: PURPOSE:To obtain the titled carrier without using a special additive and a complicated manufacturing process by molding an alumina hydrate having a Boehmite gel structure or a mixture of said hydrate and silica, silica alumina, or crystalline aluminosilicate, burning and treating it with an inorg. acid. CONSTITUTION:An alumina hydrate having a Boehmite gel structure or a mixture of said hydrate and silica, silica gel, or crystalline aluminosilicate is kneaded, molded, and burned at 500-800 deg.C to form a porous carrier composed essentially of activated alumina. It is immersed directly into an aq. dilute soln. of inorg. acid, or it is immersed in a concd. inorg. acid after being immersed into ion-exchanged water in advance to fill the micropores with said water. After the immersion, it is washed with water, dried, and burned to increase the volume of the micropores of 7.5nm in micropore diameter.

Production of catalyst for removing fine particle in diesel exhaust gas

Abstract: PURPOSE:To obtain a titled catalyst which suppresses the conversion of SO2 to sulfate and removes efficiently fine particles, by coating activated alumina on the surface of a carrier of a heat-resistant monolithic structure having a three- dimensional network structure, depositing platinum on the carrier and subjecting the carrier to a heat treatment. CONSTITUTION:Activated alumina is coated on the surface of a carrier of a heat-resistant monolithic structure having a three-dimensional network structure (e.g.; cordierite type structure) at 20-200g for each 1l of the carrier. Platinum is deposited on the carrier coated with activated alumina. The concn. of the platinum in a soln. of, for example, chloroplatinic acid or the like is adjusted to a prescribed concn., and the soln. is impregnated with the carrier whereby 0.01- 3g platinum for each 1l volume of the carrier is deposited on the carrier. Such structure is calcined at 700-1,000 deg.C. If the resulted catalyst is used, the conversion of SO2 to sulfate is suppressed and the fine particles consisting essentially of carbon is efficiently made nonpollutive and is removed.

Separation and recovery of carbon monoxide from mixed gas containing carbon monoxide

Abstract: PURPOSE: To enable the separation and recovery of CO having high purity from a CO-containing mixed gas, smoothly, in high efficiency, by removing the impurities and water from the mixed gas pressurized by a pressure-swing method, converting the CO to CO 2 with O 2 existing in the gas, and adsorbing CO with a specific adsorbent. CONSTITUTION: A CO-containing gas such as converter gas generated from the converter of an iron mill is compressed to 0.12W9kg/cm 2 G by a compressor or a blower. The impurities in the compressed mixed gas, such as S compounds, NH 3 , etc. are removed by the adsorption to an adsorbent such as supported activated carbon, etc. Water is removed from the mixed gas by alternately switching two adsorption columns filled with zeolite or activated alumina by pressure-swing method, and at the same time, the adsorbent in the column out of operation is dried and regenerated. The small amount of O 2 existing in the mixed gas is made to react with CO in the presence of a binary catalyst consisting of a partially reduced copper oxide and zinc oxide, and the produced CO 2 is removed. Thereafter, CO in the mixed gas is adsorbed to a solid adsorbent capable of selectively adsorbing CO and prepared by supporting a cuprous halide and optionally aluminum halide on a carrier such as activated carbon, etc., and the adsorbed CO is desorbed and recovered. COPYRIGHT: (C)1986,JPO&Japio