초록 ▼

The use of zeolites rich in silicic acids having an Si:Al ratio of 1:1 to 100:1 as specific adsorbents for NOX or CO is proposed. Because of their property of specifically adsorbing NOX or CO, these zeolites, in particular those zeolites doped with such metals as Ca, Co, Ni, Fe, Cu, Ag, Pt or Ru, an

The use of zeolites rich in silicic acids having an Si:Al ratio of 1:1 to 100:1 as specific adsorbents for NOX or CO is proposed. Because of their property of specifically adsorbing NOX or CO, these zeolites, in particular those zeolites doped with such metals as Ca, Co, Ni, Fe, Cu, Ag, Pt or Ru, and having the above mentioned ratio of Si to Al, are especially suitable for the production of specific NOX or CO sensors based on semiconductors. Such sensors can be used as sensors for exhaust gases of automotive vehicles, for example.

대표청구항 ▼

In an internal combustion engine fuel supply control means of the type having a sensor means to generate a signal in proportion to levels of nitrogen oxides or carbon monoxide in exhaust gases from said engine and being operable to control the fuel/air ratio being introduced into the engine for comb

In an internal combustion engine fuel supply control means of the type having a sensor means to generate a signal in proportion to levels of nitrogen oxides or carbon monoxide in exhaust gases from said engine and being operable to control the fuel/air ratio being introduced into the engine for combustion, the improvement wherein said sensor means comprises a sensor specific for a nitrogen oxide or carbon monoxide comprising a semiconductor having a control element; and a zeolite rich in silicic acid with an Si:Al ratio of 1:1 to 100:1, and which is a specific adsorbent for the nitrogen oxide or the carbon monoxide coated on said control element to influence the electrical characteristics of said semiconductor in proportion to the amount of the nitrogen oxide or carbon monoxide adsorbed by said zeolite and wherein said semiconductor is an FET transistor and said zeolite is coated on its gate.