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公开(公告)号：AU636075B2
公开(公告)日：1993-04-08
申请号：AU1132992
申请日：1992-02-28
Applicant: DEGUSSA AKTIENGESELLSCHAFT
Inventor： DIETER BINDER , PETER KLEINSCHMIT , HANS HOFFMEISTER , ROLAND REUTER
IPC: C01G25/02 , C04B35/486
Abstract: The invention relates to monoclinic zirconium oxide having an SiO2 content of less than 1% by weight, which is characterised by dendrite-shaped particles having a mean grain size (d50 value) in the range from 0.5 mu m to 3.0 mu m and a specific surface area (BET) in the range from 3 to 15 m /g. The zirconium oxide is prepared by thermal cracking of zirconium silicate in a high-frequency or medium-frequency inductive fusion furnace with a sinter crust crucible, quenching of the melt by blowing air onto a melt jet and/or spraying the latter with water and leaching the thermally cracked zirconium silicate with concentrated alkali metal hydroxide solution at 100 to 200 DEG C. The zirconium oxides according to the invention is distinguished from prior zirconium oxide by its improved suitability for the production of zirconium silicate colouring materials of the host lattice and inclusion types - pigments of higher colour intensity are obtained.
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公开(公告)号：ZA8803833B
公开(公告)日：1988-12-13
申请号：ZA8803833
申请日：1988-05-27
Applicant: DEGUSSA AKTIENGESELLSCHAFT
Inventor： MICHAEL WITZEL , PETER KLEINSCHMIT , WOLF-DIETER PFEIFER , CARL VOIGT , PETER ALBERS
CPC classification number: B01J23/40 , C01C3/0229
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公开(公告)号：ZA883833B
公开(公告)日：1988-12-13
申请号：ZA883833
申请日：1988-05-27
Applicant: DEGUSSA AKTIENGESELLSCHAFT
Inventor： MICHAEL WITZEL , PETER KLEINSCHMIT , WOLF-DIETER PFEIFER , CARL VOIGT , PETER ALBERS
Abstract: A specific form of surface coating of Al2O3 catalysts, using additional amounts of aluminium ions and minimum amounts of platinum ions, made it possible to use Al2O3 as a catalyst for long-term operation (150 days and more) in the preparation of hydrogen cyanide from hydrocarbons and ammonia, preferably in the BMA process.
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