公开(公告)号：US4194994A

公开(公告)日：1980-03-25

申请号：US845796

申请日：1977-10-26

申请人： Detlef Baresel ,  Peter Scharner ,  Gerhard Huth ,  Winfried Gillert

发明人： Detlef Baresel ,  Peter Scharner ,  Gerhard Huth ,  Winfried Gillert

IPC分类号： G01N27/12 ,  H01B1/08

CPC分类号： G01N27/12 ,  Y10T436/208339

摘要： Tin oxide doped with magnesium oxide or niobium pentoxide and prepared as a sintered material is found to be highly sensitive to oxygen partial pressure both in the presence of free oxygen and in the presence of oxidizable gases, such as carbon monoxide or the lower oxides of nitrogen, and even in the presence of mixtures of both, such as in the exhaust gas of an internal combustion engine. The electrical conductivity varies by substantially more than an order of magnitude in response to a change in the oxygen partial pressure of about one-half an order of magnitude. The doped oxides operate as poor catalysts for the oxidation of oxidizable components of the exhaust gases. Chromium oxide doped with tin oxide shows the effect of an excessively good catalysis from the point of view of range of measurement, but is usable to give a sharp indication of the appearance or disappearance of free oxygen in a gas mixture. Zinc oxide doped with aluminum oxide has a conductivity that is good for measuring the content of free oxygen, but is of questionable value in the presence of a substantial concentration of carbon monoxide.

摘要翻译： 发现掺杂有氧化镁或五氧化二铌的氧化锡作为烧结材料，在游离氧的存在下和在可氧化气体如一氧化碳或氮的低氧化物存在下对氧气分压非常敏感 ，甚至在二者的混合物的存在下，例如在内燃机的废气中。 响应于氧分压的变化约为一个数量级，电导率基本上大大地改变一个数量级。 掺杂的氧化物作为用于氧化废气的可氧化组分的不良催化剂起作用。 掺杂有氧化锡的氧化铬从测量范围的观点来看显示出过度的催化效果，但可用于给出气体混合物中游离氧的外观或消失的清晰指示。 掺有氧化铝的氧化锌具有良好的测量游离氧含量的电导率，但在存在大量一氧化碳的情况下是有价值的。