Hydrogen detection system

Assembled products Fuel cell vehicles Hydrogen storage systems Refueling devices Hydrogen detection systems Hybrid-electric vehicles Natural gas vehicles ... 

A hydrogen detection system that can detect and report in a continuous manner the hydrogen content in the containment atmosphere. Alarms at proper setpoints are provided. 

In the chemiluminescence-based HPLC detection system, illustrated schematically in Figure 6, the oxalate ester and hydrogen peroxide are introduced to the eluent stream at postcolumn mixer Mj, which then flows through a conventional fluorescence detector with the exciting lamp turned off or a specially built chemiluminescence detector. The two reagents are combined at mixer Mj, rather than being premixed, to prevent the slow hydrolytic reactions of the oxalate ester. 

Table 4 illustrates the use of the CAR technique to develop CL kinetic-based determinations for various analytes in different fields. As can be seen, the dynamic range, limit of detection, precision, and throughput (—80-100 samples/ h) are all quite good. All determinations are based on the use of the TCPO/ hydrogen peroxide system by exception, that for p-carboline alkaloids uses TCPO and DNPO. A comparison of the analytical figures of merit for these alkaloids reveals that DNPO results in better sensitivity and lower detection limits. However, it also leads to poorer precision as a result of its extremely fast reactions with the analytes. Finally, psychotropic indole derivatives with a chemical structure derived from tryptamines have also been determined, at very low concentrations, by CAR-CLS albeit following derivatization with dansyl chloride. 

Studies have also been made on the coupling of the CL luminol-hydrogen peroxide in HTAB reversed micellar medium detection system with enzyme reactions [64], The use of HTAB reversed micellar medium permits the simultaneous performance of both reactions, enzyme and CL detection, at a mild pH in the... 

C. The Detection of Cyclohexene Intermediates The postulate that olefins are released from the surface during the hydrogenation of aromatic hydrocarbons has gained considerable support. Madden and Kemball (89) observed cyclohexene during the early stages of the vapor phase hydrogenation (flow system) of benzene over nickel films at 0° to 50°. The ratio of cyclohexene to cyclohexane diminished with time, and little or none of the alkene was detected if the films were annealed at 50° in a stream of hydrogen. 

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