Exhaust gas catalytic purifier construction

The combination comprising:

• a source of exhaust gas containing noxious components;
• and
• an exhaust gas catalytic purifier comprising:
• a metallic exhaust gas conduit, comprising an inside wall and an outside wall, which conduit contains:
• a substantially uniform, electrically energizable bonding layer in at least one form selected from the group consisting of a layer of gross structural crystals, a film of columnar shaped crystals, and an intermetallic compound,
• which bonding layer has been formed by chemical vapor deposition on said inside wall of said conduit,
• which bonding layer is supported by said inside wall of said conduit,
• wherein said bonding layer has a heat capacity sufficient to generate heat upon being energized,
• wherein said bonding layer has a substantially uniformly formed, sufficiently rough surface to firmly bond a catalyst layer thereto,
• wherein said bonding layer comprises:
• at least one carbide selected from the group consisting of tungsten carbide, molybdenum carbide, silicon carbide, and carbides of alloys of said metals, or
• at least one silicide selected from the group consisting of tungsten silicide, molybdenum silicide, tantalum silicide, titanium silicide, and silicides of alloys of said metals;
• a catalyst layer disposed on and firmly bonded to said rough surface of said bonding layer directed away from said conduit;
• means to energize said bonding layer which comprises electromagnetic induction means comprising:
• coil means disposed on a peripheral portion of said catalyst carrier, and
• high frequency generator means in operative contact with said coil means;
• wherein said generator is sufficient to supply a current to said coil means of a frequency high enough to energize said bonding layer to an extent sufficient to generate heat which is sufficient to heat said catalyst to an operating temperature sufficient to cause the conversion of said noxious fumes and to thereby convert noxious fumes in said exhaust gas;
• means to introduce said exhaust gas containing noxious components into said metallic gas conduit;
• means to contact said noxious fumes with said catalyst layer heated by said energized bonding layer under conditions sufficient to convert noxious fumes;
• and
• means to remove exhaust gas, containing a smaller proportion of noxious fumes, from said purifier.

The combination of;

• a source of exhaust gas containing noxious fumes;
• an exhaust gas passage having an inside surface, operatively associated with said source so as to pass said exhaust gas therethrough;
• an exhaust gas catalytic purifier disposed within said exhaust gas passage comprising:
• an electromagnetic induction heating coil means disposed inwardly of said exhaust gas passage disposed on said inside surface of said passage;
• a heat conductive means disposed on an inwardly directed portion of said electromagnetic induction heating coil means in heatable relation to said induction coil heating means disposed in said exhaust gas passage;
• and
• exhaust gas conversion catalyst inwardly disposed on and carried by said heat conductive means so positioned as to be heatable by said heat conductive means and in operative contact with noxious fumes in exhaust gas passing through said passage;
• wherein said induction heating coil means is disposed in sufficiently close proximity to said conductive means to cause current to pass through said conductive means via electromagnetic induction in an amount sufficient to cause said conductive means to become heated and to thereby heat said catalyst;
• a ceramic support lattice disposed on said inside surface of said exhaust gas passage in supporting relation to said induction heating coil means;
• wherein said conductive means comprises a substantially uniform, electrically energizable rough bonding layer in at least one form selected from the group consisting of a layer of gross structural crystals, a film of columnar shaped crystals, and an intermetallic compound;
• wherein said bonding layer has been formed by chemical vapor deposition;
• wherein said bonding layer has been formed onto and is bonded to said ceramic support lattice;
• wherein said bonding layer comprises:
• at least one carbide selected from the group consisting of tungsten carbide, molybdenum carbide, silicon carbide, and carbides of alloys of said metals, or
• at least one silicide selected from the group consisting of tungsten silicide, molybdenum silicide, tantalum silicide, titanium silicide, and silicides of alloys of said metals;
• wherein said catalyst is disposed on and is bonded to said bonding layer;
• and
• a generator sufficient to supply current to said induction heating coil of sufficient frequency and magnitude to cause said induction heating coil to produce an alternating magnetic flux of sufficient magnitude to cause current to flow in said conductive means in an amount sufficient to generate sufficient heat to heat said catalyst to a temperature at which said catalyst is operative to catalyze conversion of noxious fumes in said exhaust gas.

The combination of;

• a source of exhaust gas containing noxious fumes;
• an exhaust gas passage having an inside surface, configured to pass said exhaust gas therethrough;
• an exhaust gas catalytic purifier inside said exhaust gas passage comprising:
• an electrically non-conductive support;
• an electrically conductive means;
• and
• an exhaust gas conversion catalyst;
• an electromagnetic induction coil means disposed on an inside surface of said exhaust gas passageway in sufficiently close proximity to said electrically conductive means to cause current to pass through said electrically conductive means via electromagnetic induction in an amount sufficient to cause said electrically conductive means become heated and to thereby heat said catalyst to a conversion temperature,
• said electrically non-conductive support is disposed on an inside surface of said coil,
• said electrically conductive means is disposed on an inside surface of said electrically non-conductive support,
• wherein said catalyst is disposed on and carried by an inside surface of said electrically conductive means and is in sufficiently close proximity to said electrically conductive means to be heated by said electrically conductive means;
• wherein said conductive means comprises a substantially uniform, electrically energizable rough bonding layer in at least one form selected from the group consisting of a layer of gross structural crystals, a film of columnar shaped crystals, and an intermetallic compound;
• wherein said bonding layer has been formed by chemical vapor deposition;
• wherein said bonding layer has been formed onto and is bonded to said electrically non-conductive support;
• wherein said bonding layer comprises:
• at least one carbide selected from the group consisting of tungsten carbide, molybdenum carbide, silicon carbide, and carbides of alloys of said metals, or
• at least one silicide selected from the group consisting of tungsten silicide, molybdenum silicide, tantalum silicide, titanium silicide, and silicides of alloys of said metals;
• wherein said catalyst is disposed on and is bonded to said bonding layer;
• and
• generator means sufficient to supply current to said induction coil of sufficient frequency and magnitude to cause said induction coil to produce an alternating magnetic flux of sufficient magnitude to cause current to flow in said electrically conductive means in an amount sufficient to generate sufficient heat to heat said catalyst to a temperature at which said catalyst is operative to catalyze conversion of noxious fumes in said exhaust gas.