CORRELATION BETWEEN CARRIER POROUS STRUCTURE AND GAS-SENSITIVE PROPERTIES OF THERMOCATALYTIC GAS SENSORS

In order to determine the correlation between the gas-sensitive proper ties of the thermocatalytic gas sensor (TGS) and the porous structure of the carrier, two types of carriers have been investigated. Their so rptional parameters at different calcination temperatures have been st udied. The parameters of the porous structure and the gas-sensitive pr operties of the TGS are characterized by measurements of benzene vapou r adsorption and methane oxidation using methane/air mixtures, respect ively. The obtained data indicate that the sensitivity of the TGS is r elated in some way with the structural parameters of the carrier (pore size and diameter distribution). Carriers must have a sorption capaci ty no less than 0.30 cm(3) g(-1), surface area of 100-140 m(2) g(-1) a nd possess biporous pore-volume size distribution.