초록 ▼

This invention relates to a process for the manufacture of catalysts for the reduction of oxides of nitrogen from exhaust gases and in chemical air cleaning processes in which a catalytically active material containing iron ores, chromium ores and/or zeolite is placed in contact with a carrier means

This invention relates to a process for the manufacture of catalysts for the reduction of oxides of nitrogen from exhaust gases and in chemical air cleaning processes in which a catalytically active material containing iron ores, chromium ores and/or zeolite is placed in contact with a carrier means having a series of openings; e.g., wire mesh, expanded or perforated metal or any type of grid-like structure to form a catalytic member. The carrier means is etched with an acid etchant before forming the catalytic member or, instead, the catalytic member is etched with an acid etchant. The catalytic member is bonded by a thermal treatment; e.g., drying, tempering and/or fixing. This invention also relates to catalytic members or products produced by the process. This invention proposes the use of pressure bonding to obtain a catalytic member product which has significantly improved catalytic activity, greater mechanical strength and higher resistance to chipping.

대표청구항 ▼

Process for the manufacture of a catalytic member for the reduction of oxides of nitrogen which comprises: providing a particulate catalytically active material selected from the group consisting of iron ore, chromium ore, zeolite and combinations thereof; depositing said catalytically active materi

Process for the manufacture of a catalytic member for the reduction of oxides of nitrogen which comprises: providing a particulate catalytically active material selected from the group consisting of iron ore, chromium ore, zeolite and combinations thereof; depositing said catalytically active material on a metal carrier means having openings; thermally bonding the carrier means to the catalytically active material to form a unitary body; etching the unitary body with an etchant acid and applying at least 0.5 newtons per square millimeter pressure to the etched unitary body. A catalytic member for use in the reduction of oxides of nitrogen comprising a compressed composite body having an etched carrier means with a series of openings sandwiched between two layers of a catalytically active material selected from the group consisting of iron ore, chromium ore, zeolite and combinations thereof.