Catalyst carrier

A catalyst carrier to which electric power is applied to effect heating, the catalyst carrier comprising:

• first, second and third catalyst foils having a strip shape defining a longitudinal direction and a widthwise direction, said first, second and third catalyst foils being formed of a conductive foil of a heat-resistant alloy;
• said first, second and third catalyst foils having a wave contoured shape in cross section with a wave direction, extending generally in the longitudinal direction, and having crests and valleys extending generally in the widthwise direction;
• said first, second and third catalyst foils including an insulating layer and a catalyst-carrying layer;
• said first, second and third catalyst foils being wound spirally together to form a spiral with said first, second and third catalyst foils such that electrical contact between said first, second and third catalyst foils at surface portions thereof is prevented by said insulating layer, said spiral being wound in a configuration wherein:
• said first, second and third catalyst foils each have opposite ends which are connected at connection portions to said opposites ends of other ones of said first, second and third catalyst foils to form an endless catalyst foil having a substantially equilateral-triangular cross section prior to winding with said first, second and third catalyst foils being sides thereof;
• said first, second and third catalyst foils each having center portions moved uniformly toward a center of the triangular cross section prior to winding said spiral;
• and
• said connection portions are rotated about a vertical axis passing through the center while said center portions are maintained at position at the center in order to wind said spiral such that said connection portions are disposed at a periphery of said spiral once wound;
• and
• said first, second and third catalyst foils having said connection portions located at a periphery of said spiral for connection to a three-phase alternating current source in order to establish a delta connection.

A catalyst carrier to which electric power is applied to effect heating, the catalyst carrier comprising:

• first, second and third catalyst foils having a strip shape defining a longitudinal direction and a widthwise direction, said first, second and third catalyst foils being formed of a conductive foil of a heat-resistant alloy;
• said first, second and third catalyst foils having a wave contoured shape in cross section with a wave direction, extending generally in the longitudinal direction, and having crests and valleys extending generally in the widthwise direction;
• said first, second and third catalyst foils including an insulating layer and a catalyst-carrying layer;
• said first, second and third catalyst foils being wound spirally together to form a spiral such that electrical contact between said first, second and third catalyst foils at surface portions thereof is prevented by said insulating layer, said first, second and third catalyst foils being superposed in said spiral with respective longitudinal sides thereof offset from one another in the widthwise direction;
• and
• said first, second and third catalyst foils having connection means for applying three phase alternating current thereto to effect heating of said first, second and third catalyst foils.

A catalyst carrier to which electric power is applied to effect heating, the catalyst carrier comprising:

• first, second and third catalyst foils having a strip shape defining a longitudinal direction and a widthwise direction, said first, second and third catalyst foils being formed of a conductive foil of a heat-resistant alloy;
• said first, second and third catalyst foils having a wave contoured shape in cross section with a wave direction, extending generally in the longitudinal direction, and having crests and valleys extending generally in the widthwise direction;
• said first, second and third catalyst foils including an insulating layer and a catalyst-carrying layer;
• said first, second and third catalyst foils being wound spirally together to form a spiral such that electrical contact between said first, second and third catalyst foils at surface portions thereof is prevented by said insulating layer;
• said first, second and third catalyst foils having connection means for applying three phase alternating current thereto to effect heating of said first, second and third catalyst foils;
• said connection means including said first, second and third catalyst foils having first ends connected to a center rod;
• said first, second and third catalyst foils being wound spirally around said center rod;
• said connection means including said first, second and third catalyst foils having second ends located at a peripheral portion of said spiral, said second ends and said center rod being disposed for connection to a three-phase alternating current source;
• and
• said first, second and third catalyst foils being superposed in said spiral with respective longitudinal sides thereof offset from one another in the widthwise direction.

A catalyst carrier to which electric power is applied to effect heating, the catalyst carrier comprising:

• catalyst foil in a strip shape defining a longitudinal direction and a widthwise direction, said catalyst foil being formed of a conductive foil of a heat-resistant alloy, said catalyst foil being connected to form a loop;
• said catalyst foil having a wave contoured shape in cross section with a wave direction, extending generally in the longitudinal direction, and having crests and valleys extending generally in the widthwise direction;
• said catalyst foil including an insulating layer and a catalyst-carrying layer;
• said catalyst foil being wound spirally together to form a spiral such that electrical contact between surface portions of said catalyst foil is prevented by said insulating layer, said spiral being wound in a configuration wherein:
• said loop of said catalyst foil has three segments of substantially equal length with connection portions formed at junctions of said segments, said connection portions being disposed at a periphery of said spiral;
• said segments of said catalyst foil each having center portions disposed at a center portion of said spiral;
• and
• said catalyst foil having said connection portions located at said periphery of said spiral for connection to a three-phase alternating current source in order to establish a delta connection.