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公开(公告)号：US3931390A
公开(公告)日：1976-01-06
申请号：US524855
申请日：1974-11-18
CPC分类号： C01B17/0491 , B01D53/8609 , B01J23/83 , C01B17/0478 , C01B17/0486
摘要： This application describes a process for the catalytic reduction of sulfur dioxide in gas streams containing sulfur dioxide to elemental sulfur using a reducing gas such as hydrogen or, preferably, carbon monoxide, and a catalyst of the formula Ln.sub.2 O.sub.3 . Co.sub.2 O.sub.3, where Ln is either Y or Gd.
摘要翻译： 本申请描述了一种使用还原气体如氢气或优选一氧化碳将催化还原含二氧化硫的二氧化硫还原成元素硫的方法，以及式Ln 2 O 3的催化剂。 Co2O3，其中Ln是Y或Gd。
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公开(公告)号：US5053074A
公开(公告)日：1991-10-01
申请号：US632237
申请日：1990-12-20
IPC分类号： C22C29/00
CPC分类号： C22C29/005
摘要： A dense cermet article including about 80-90% by volume of a granular hard phase and about 5-20% by volume of a metal phase. The hard phase is a carbide, nitride, carbonitride, oxycarbide, oxynitride, or carboxynitride of a cubic solid solution selected from W-Ti, W-Hf, W-Nb, W-Ta, Zr-Ti, Hf-Ti, Hf-Zr, V-Ti, Nb-Ti, Ta-Ti, or Mo-Ti. The metal phase consists essentially of a combination of nickel and aluminum having a ratio of nickel to aluminum of from about 90:10 to about 70:30 by weight, and 0-5% by weight of an additive selected from titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, cobalt, boron, and/or carbon. The preferred hard phase is a cubic solid solution of tungsten and titanium. In the preferred metal phase, an amount of about 15-80% by volume of the metal phase component exhibits a Ni.sub.3 Al ordered crystal structure. The article may be produced by presintering the hard phase - metal phase component mixture in a vacuum or inert atmosphere at about 1475.degree.-1675.degree. C., then densifying by hot isostatic pressing at a temperature of about 1575.degree.-1675.degree. C., in an inert atmosphere, and at about 34-207 MPa pressure. Limiting the presintering temperature to 1475.degree.-1575.degree. C. and keeping the presintering temperature at least 50.degree. C. below the hot pressing temperature produces an article of gradated hardness, harder at the surface than at the core.
摘要翻译： 包括约80-90体积％的粒状硬质相和约5-20体积％的金属相的致密金属陶瓷制品。 硬相是选自W-Ti，W-Hf，W-Nb，W-Ta，Zr-Ti，Hf-Ti，Hf-Ti的立方固溶体的碳化物，氮化物，碳氮化物，碳氧化物，氮氧化物或氮氧化物， Zr，V-Ti，Nb-Ti，Ta-Ti或Mo-Ti。 金属相基本上由镍和铝的组合组成，镍与铝的比例为约90:10至约70:30重量，以及0-5重量％的选自钛，锆，铪的添加剂 ，钒，铌，钽，铬，钼，钨，钴，硼和/或碳。 优选的硬相是钨和钛的立方固溶体。 在优选的金属相中，金属相组分的约15-80体积％的量呈现出Ni 3 Al有序晶体结构。 制品可以通过在真空或惰性气氛中在约1475℃-1675℃预烧结硬相 - 金属相组分混合物，然后在约1575℃-1675℃的温度下通过热等静压进行致密化， 在惰性气氛中，压力约为34-207MPa。 将预烧温度限制在1475°-1575℃，并将预烧温度保持在低于热压温度的至少50℃，会产生一层比较硬的硬度，表面硬度比核心硬。
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公开(公告)号：US4022870A
公开(公告)日：1977-05-10
申请号：US596340
申请日：1975-07-16
CPC分类号： B01D53/8609 , B01J23/83 , C01B17/0478 , C01B17/0486 , C01B17/0491
摘要： This application describes a process for the catalytic reduction of sulfur dioxide in gas streams containing sulfur dioxide to elemental sulfur using a reducing gas such as hydrogen or, preferably, carbon monoxide, in a reactor charged with a material represented by the formula Ln.sub.2 O.sub.3 . Co.sub.2 O.sub.3, where Ln is either Y or Gd.In a further aspect of this invention, a gas stream containing hydrogen sulfide or carbonyl sulfide and sulfur dioxide is passed through a reaction chamber charged with Ln.sub.2 O.sub.3 . Co.sub.2 O.sub.3, where Ln is either Y or Gd, to catalytically produce at a sufficiently elevated temperature elemental sulfur with concomitant reduction of the concentrations of the undesired hydrogen sulfide or carbonyl sulfide and sulfur dioxide.
摘要翻译： 本申请描述了在装有由式Ln 2 O 3表示的材料的反应器中，使用还原气体如氢气或优选一氧化碳，将含有二氧化硫的气流中的二氧化硫催化还原为元素硫的方法。 Co2O3，其中Ln是Y或Gd。
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