Abstract: A method and associated apparatus for on-line gas analysis of a multicomponent gas emission flow, comprising: continuously withdrawing and regulating the pressure of a first sample flow from the emission flow, continuously withdrawing a second sample flow from the first sample flow, the second flow sample being diluted with mass controlled amounts of diluent (N.sub.

Abstract: A method is disclosed for substantially completely catalytically oxidizing alcohol vapor and/or formaldehyde vapor contained in low concentration in a heated carrier gas mixture at low temperatures such as encountered in exhaust gas treatment during the engine warm-up period and having oxygen present in a wide range of lambda values from momentarily rich (0.8) to very lean engine operation (lambda>5). The carrier gas mixture is sequentially exposed (i) to a first catalyst consisting substantially of palladium and of rhodium in a weight ratio of Rh/Pd of 0-0.3, and/or CeO.sub.2 in a weight ratio of CeO.sub.2 Pd of 0-50, and (ii) subsequently immediately to a second catalyst consisting substantially of the base metal silver, whereby the combination of said catalysts synergistically improve the oxidation of said mixture to achieve at least a 96% oxidation conversion of said alcohol vapor and to produce less than 1% of the coverted methanol as aldehydes.Palladium is effective in converting methanol to CO.sub.

Abstract: A method is disclosed of making an on-line gas analysis of a multicomponent gas emission flow by (a) continuously sequestering a sample flow from the gas emission flow, which sample flow may be filtered to substantially eliminate solid or liquid particles, diluted to lower its dew point to below room temperature, and changed in either temperature and/or pressure to be substantially the same in temperature and pressure as that of gases used to create reference transmission frequency spectral data employed in step (d); (b) continuously irradiating the sample flow with an electromagnetic radiation beam while modulating the amplitude of infrared frequencies in the audio frequency range of the beam, either prior to or immediately subsequent to irradiation of the sample flow, to produce electromagnetic signals having discernible amplitude variations resulting from spectral interference patterns; (c) detecting and collecting the signals at a sufficiently high rate to substantially completely distinguish between adja

Abstract: A method is disclosed of making an on-line gas analysis of a multicomponent gas emission flow by (a) continuously sequestering a sample flow from the gas emission flow, which sample flow has been filtered to substantially eliminate solid or liquid particles, diluted to lower its dew point to below room temperature, and changed in either temperature and/or pressure to be substantially the same in temperature and pressure as that of gases used to create reference transmission frequency spectral data deployed in step (d); (b) continuously irradiating the sample flow with an electromagnetic radiation beam while modulating the amplitude of infrared frequencies in the audio frequency range of the beam, either prior to or immediately subsequent to irradiation of the sample flow, to produce electromagnetic signals having discernible amplitude variations resulting from spectral interference patterns; (c) detecting and collecting the signals at a sufficiently high rate to substantially completely distinguish between ad