32 results about "Catalytic sensor" patented technology

The invention provides a nanostructure including nanowires having very small diameters and integrated at a high density, and capable of being applied to still further high-functional devices.The invention provides a structure including a substrate or substrate having an underlayer, and a structure formed on the substrate or substrate having an underlayer, wherein the structure includes a columnar first part (part) and a second part (part) formed to surround the first part, and the second part comprises two or more types of materials capable of forming eutectic crystals, one type of the materials is a semiconductor material, and the height of the first part from the substrate is greater than the height of the second part from the substrate.

An exhaust system for a lean burn internal combustion engine comprises: (a) a catalysed soot filter (CSF) (32); (b) a control unit (38); (c) means (18), controllable by the control unit, for 5 increasing a content of combustible hydrocarbon (HC) and / or carbon monoxide (CO) in an exhaust gas flowing into the CSF thereby to combust the HC and / or CO in the CSF, to increase the temperature of the CSFand to combust particulate matter collected thereon; and (d) catalysed sensor means (36) disposed between an engine manifold (28) and the CSF for combusting CO and / or HC in exhaust gas flowing in theexhaust system and inputting the control unit wit h a 10 datum correlat ing with an enthalpy of combustion of HC and / or CO in the exhaust gas, whereby the control unit, when in use, controls the combustible HC and / or CO introducing means in response to the datum input thereby to control the rate of contacting the CSF with combustible HC and / or CO.

The invention provides an inflammable gas detecting instrument and a desulphurization method thereof, wherein the detecting instrument comprises a microprocessor circuit, a catalytic sensor connected with the microprocessor circuit, and an output voltage controllable power supply circuit; a sensor voltage output end of the output voltage controllable power supply circuit is connected with a power source end of the catalytic sensor, and an voltage control end of the microprocessor circuit is connected with a sensor voltage adjustment control end of the output voltage controllable power supply circuit; the desulphurization method comprises the following steps: the microprocessor circuit controls the output voltage controllable power supply circuit for voltage adjustment; the output voltage of the sensor voltage output end is improved to 1.5 times of the normal working voltage and the time is delayed for 120s; the output voltage controllable power supply circuit is continued to be controlled so as to enable the output voltage of the sensor voltage output end to be zero or normal working voltage. The detecting instrument has the advantages of automatic desulphurization, accurate measuring result, safety and reliability; furthermore, the desulphurization method is simple and practical, and is easy to realize.

The present invention relates to methods and systems for oxygen sensors. Various systems and methods are described for an engine system having an exhaust gas recirculation system and catalytic and non-catalytic intake oxygen sensors. In one example, the catalytic oxygen sensor is used to measure and control exhaust gas recirculation while measuring and controlling fuel vapor purge based on the catalytic and non-catalytic sensors.

The invention discloses a method for preparing nanoporous silver by electrodeposition. It first drops silver nitrate solution into potassium iodide solution and stirs, copper nitrate solution and sodium sulfite solution are mixed, then drops into potassium iodide solution and stirs, and then the obtained [AgI 2 ] ‑ Complexation solution and [CuI 2 ] ‑ After the complex solution is mixed, place silver-silver chloride as a reference electrode, a graphite sheet as a counter electrode, a conductive substrate or a conductive template as a working electrode in the obtained complex mixed solution for electrodeposition, and then, the obtained The silver-copper alloy on the surface of the conductive substrate or the conductive template with the silver-copper alloy are immersed in saturated potassium iodide solution for cleaning, and then the pure silver-copper alloy on the surface of the conductive substrate or the pure silver-copper alloy on the conductive film are immersed in ammonia water and The mixed solution of ethanol is mixed with oxygen, and the nanoporous silver with various shapes and sizes with a pore diameter less than or equal to 20nm can be prepared. Its products are extremely easy to be widely commercialized in the fields of catalysis, sensors, fuel cells and SERS spectral detection.

The invention provides a preparation method of Ag nano-particles. Electric energy is provided by a high-voltage direct current power supply, a platinum needle is an anode, and AgNO is used as an anode. 3 The solution flows through the buffer bottle driven by the peristaltic pump, overflows from the top of the capillary penetrating the graphite carbon rod, and uses the overflowing solution as the discharge cathode. When a high enough voltage is applied between the two electrodes, the overflowing liquid produces a glow to form a plasma, and the active particles generated by the liquid cathode glow discharge plasma and the Ag in the solution + The reaction occurs, and the generated Ag nanoparticle turbid liquid flows into the collector along the wall of the graphitic carbon rod. Finally, the turbid liquid is ultrasonically dispersed, centrifuged, washed with distilled water, dried to constant weight, and ground to obtain Ag nanoparticles. The Ag nanoparticles synthesized by the preparation method have uniform structure, good dispersibility and low degree of agglomeration, and have broad application prospects in catalysis, sensors, electrode materials and the like.