Process for converting nitrogen dioxide into nitrogen monoxide
Process for the production of high surface area catalyst supports
Exhaust gas catalysts and process for the production thereof
Process for producing silicon carbide and metal carbides Patent #: 4948573
ApplicationNo. 873198 filed on 04/24/1992
US Classes:502/178, Silicon carbide423/213.2, Utilizing as solid sorbent, catalyst, or reactant a material containing a transition element423/213.5, Group VIII element423/439, Binary compound (e.g., carbide, etc.)423/440, Refractory metal containing501/87, Carbide or oxycarbide containing501/91, And different carbide501/92, And boride, silicide, nitride, or oxynitride502/177, Carbide502/179, Group VA (N, P, As, Sb, Bi) containing502/527.19MONOLITH WITH SPECIFIED SHAPE OR DIMENSION OF CELL OPENING (E.G., HONEYCOMB, RINGS, ETC.)
ExaminersPrimary: Konopka, P. E.
Attorney, Agent or Firm
International ClassesB01J 027/224
Foreign Application Priority Data1991-04-29 FR
AbstractThe invention relates to a catalytic system and to a method of producing such a system.The catalytic system consists of a support on which the catalytically active product is deposited. The support has mechanical or physical properties which are of interest in terms of the required working conditions, but a poor specific surface area. The catalytically active product, a metallic carbide, is obtained by coating the support in a suspension of a reducible compound of the metal in a solution of an organic compound, carbonizing this compound, reducing the metallic compound and carburizing the metal. The carbide thus obtained has a high specific surface area.Preferably, the support consists of silicon carbide produced by carbonizing a paste containing silicon, carbon and an organic resin.The invention is applicable to any form of catalyst but in particular to the monolithic catalysts intended for treating exhaust gases.