| 摘要 |
PURPOSE:To produce the titled carrier in a simple process at a low cost by alternately superposing and winding corrugated and flat sheet band-shaped metallic foil to a spiral and cylindrical shape, fitting the same into a metallic frame to form a carrier and subjecting the carrier to repeatedly coating with a concd. aq. chromic acid soln. CONSTITUTION:The corrugated and flat sheet band-shaped metallic foil having resistance to heat and oxidation (ferritic stainless steel) is alternately superposed and is wound to the spiral and cylindrical shape. The wound body is fitted into the heat resistant metallic frame (ferritic stainless steel) to form the carrier. The concd. aq. chromic acid soln. (aq. soln. of CrO3 having >=1.55 specific gravity) is coated on such carrier by a dipping method, spraying method, etc., and the carrier is heated to about 550-650 deg.C at about 5-7 deg.C/min heating up speed in a neutral or oxidizing atmosphere after dehydrating and drying at about 50-60 deg.C. The heated carrier is held at said temp. for about 30-50min. The carrier is repeatedly subjected to the respective treatments of coating-drying- heating, by which the bonding strength is increased and the catalyst carrier deposited thoroughly with the films is formed. |
