摘要:
Ketoses are stereoselectively reduced to sugar alcohol mixtures by hydrogenating a ketose in the presence of a supported copper catalyst, e.g., copper on silica, in which the individual copper particles have a largest dimension of less than 100 nm (1000 A). The preferred starting sugar is fructose or a sugar mixture containing fructose, such as invert sugar. Substantially more then half of the fructose in such sugar is reduced to mannitol.
摘要:
Hydrocarbons e.g. toluene and oxyhydrocarbons e.g. methanol are converted to other hydrocarbons by being contacted under conversion conditions with a catalyst comprising zeolite Nu-5.
摘要:
Synthesis of zeolite Nu-3 from a reaction mixture consisting of a source of silica, a source of alumina, a source of alkali metal oxide and an adamantanamine compound, for example 1-adamantanamine hydrochloride.
摘要:
Selective and controlled dealumination of an aluminosilicate zeolite is achieved by filling the pore system of the zeolite with a foreign material, for example coke, removing part of the foreign material from the outer portion of the zeolite, for example by heating in a gas stream comprising oxygen, dealuminating the outer portion, and then removing the remainder of the foreign material. Use of such a partially dealuminated zeolite as catalyst in a toluene disproportionation reaction leads to greater selectivity to para- xylene.
摘要:
A hydrogenation catalyst comprising finely divided metallic copper very stable to high temperature use is made by the continuous coprecipitation of copper compounds with hydrated silica from soluble silicate and copper salts with careful control of the pH in the range 4.5-8.0. Subsequent reduction wih hydrogen produces particularly copper (ca. 2-5 nm size) on a porous silica substrate.
摘要:
Synthesis of zeolite Nu-3 from a reaction mixture consisting of a source of silica, a source of alumina, a source of alkali metal oxide and an adamantanamine compound, for example 1-adamantanamine hydrochloride.