A pillar shaped honeycomb structure includes: a porous partition wall that defines a plurality of cells, the cells forming flow paths for a fluid, the cells extending from an inflow end face to an outflow end face; and an outer peripheral wall located at the outermost circumference. At least a part of surfaces of the partition walls has a surface layer, and the surface layer includes magnetic particles and has permeability.

A connection unit for an exhaust gas heater in an exhaust gas system of a combustion engine includes an electrically conducting connection element, elongated in the direction of a connection element longitudinal axis (L). The connection element has an inner connection region for connection to a heating conductor and an outer connection region for connection to an electrical supply. A carrier arrangement surrounds the connection element and an insulating arrangement insulates the connection element with respect to the carrier arrangement.

A purification device comprises a housing comprising a generally cylindrical wall extending along a longitudinal axis. At least one purification member is arranged in the housing and is intended to be arranged in an exhaust gas flow. The purification device comprises at least one heating element arranged in contact with the purification member, the heating element extending in a plane perpendicular to the longitudinal axis.

An electrical heating unit H for introduction into the exhaust gas system of an internal combustion engine, in particular upstream with respect to an exhaust gas purification unit, for instance a catalytic converter, which for its operation requires a temperature higher than the ambient temperature, comprises a casing (13) and at least one resistance heating element (14) which is designed as a band and is retained inside the casing (13), wherein the at least one heating band (14) is arranged so that it runs in a meandering pattern and with its flat face parallel or substantially parallel to the longitudinal axis of the casing (13). The heating unit H also comprises at least one support structure (19, 19.1) which is arranged on the end face relative to the heating band (14) and mechanically connected to the casing (13) and has slot-shaped heating band bearings (27) to retain the heating band (14) inside the casing (13), into which slot-shaped heating band bearings (27) the heating band (14) engages by an edge portion and via which support structure (19) the heating band (14) is electrically insulated from the casing (13).

A connection unit for connecting an electrical supply line to an exhaust gas heater of an exhaust system of an internal combustion engine includes an electrically conductive connection element. The connection element has a heater connection region in a first end region and a supply line connection region in a second end region. A carrier has a receiving opening, wherein the connection element is arranged and has a support region. A first insulating element is arranged in the opening and surrounds the support region. A second insulating element is arranged on a first end face of the carrier. The connection element is supported with respect to the first end face via the second insulating element. A third insulating element is arranged on a second end face of the carrier. The connection element is supported with respect to this second end face via the third insulating element.

An exhaust gas heater for an exhaust gas system of an internal combustion engine includes a carrier arrangement and a heat conductor arrangement which is carried on the carrier arrangement and which has at least one heat conductor through which current flows. At least one heat conductor is carried with respect to the carrier arrangement via at least one carrier arrangement support unit in an electrically insulated manner. At least one carrier arrangement support unit includes a carrier arrangement support element having a curved support face.

An exhaust gas heater for an exhaust gas system of an internal combustion engine includes a carrier arrangement and a heat conductor arrangement which is carried on the carrier arrangement and which has at least one heat conductor through which current flows. At least one heat conductor is carried with respect to the carrier arrangement via at least one carrier arrangement support unit in an electrically insulated manner. At least one carrier arrangement support unit includes a carrier arrangement support element having a curved support face.

An exhaust gas heater for an exhaust gas system of an internal combustion engine includes a carrier arrangement, a heating-conductor arrangement, carried on the carrier arrangement and having at least one heating conductor through which a current flows with at least one heating conductor being carried in an electrically insulated manner with respect to the carrier arrangement by at least one carrier-arrangement supporting unit and/or with at least one heating conductor being carried in an electrically insulated manner with respect to a further heating conductor by at least one heating-conductor supporting unit. A connecting arrangement securely connects the heating-conductor arrangement to the carrier arrangement and also a length-compensating arrangement for compensating for different thermal expansions of components of the exhaust gas heater.

An exhaust gas heater for an exhaust gas system of an internal combustion engine includes a carrier arrangement, a heating-conductor arrangement, carried on the carrier arrangement and having at least one heating conductor through which a current flows with at least one heating conductor being carried in an electrically insulated manner with respect to the carrier arrangement by at least one carrier-arrangement supporting unit and/or with at least one heating conductor being carried in an electrically insulated manner with respect to a further heating conductor by at least one heating-conductor supporting unit. A connecting arrangement securely connects the heating-conductor arrangement to the carrier arrangement and also a length-compensating arrangement for compensating for different thermal expansions of components of the exhaust gas heater.

An exhaust-gas heater for an exhaust-gas system of an internal combustion engine includes a carrier arrangement and a heating-conductor arrangement, which is carried on the carrier arrangement, and which has at least one heating conductor. The carrier arrangement includes an annular first carrier element, which surrounds an exhaust-gas-heater longitudinal axis, and a plurality of second carrier elements, which are formed separately from the first carrier element and are connected to the first carrier element in a first connecting region and to a coupling region of the heating-conductor arrangement in a second connecting region.