The kinetics of the reverse Deacon reaction

Nanda, Arun

doi:10.31274/rtd-180813-11691

Cited by 2 publications

(3 citation statements)

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“…Additionally, a higher gas line temperature in these laboratory experiments may affect the relative abundance of the oxychlorine decomposition products that are introduced onto the Tenax trap after pyrolysis. Perhaps the most significant example of this, as it pertains to our study, is that the reaction of Cl 2 with H 2 O shifts more toward the production of HCl and O 2 at higher temperatures [Nanda and Ulrichson, 1988]. This would affect the potential degradation of the Tenax trap materials, as HCl is less reactive than Cl 2 .…”

Section: 1002/2015je004825mentioning

confidence: 74%

“…The slower He flow rate on SAM means that volatiles released during pyrolysis would take longer to reach the Tenax trap, thereby allowing more time for reactions to occur in the pyrolysis oven and GPS. Nanda and Ulrichson [1988] also found that increasing the flow rate of H 2 O results in a corresponding increase in the rate of reaction between Cl 2 and H 2 O to form HCl. Therefore, Cl 2 may remain in the pyrolysis oven and GPS for a longer period of time, before being converted to HCl, than in our experiments.…”

Section: 1002/2015je004825mentioning

confidence: 84%

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Evaluation of the Tenax trap in the Sample Analysis at Mars instrument suite on the Curiosity rover as a potential hydrocarbon source for chlorinated organics detected in Gale Crater

et al. 2015

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The Sample Analysis at Mars (SAM) instrument suite aboard Curiosity has detected chlorinated organic compounds in Martian sediment samples. The chlorine in these molecules is thought to derive from oxychlorine salts in Martian sediments, but the carbon source remains under investigation. To constrain possible carbon sources, we investigated how the composition and concentration of oxychlorine phases in solid samples affect organic molecules released from the Tenax traps on board SAM. We created Mars analogue soils by spiking olivine sand with calcium perchlorate, magnesium perchlorate, or ferric iron chloride and analyzed the volatiles generated during pyrolysis-gas chromatography-mass spectrometry using commercial instruments operated under SAM-like conditions, with and without a Tenax trap. Benzoic acid, phthalic anhydride, high molecular weight aromatics, and chlorobenzenes are produced from the trap in response to volatiles released during Cl salt pyrolysis. Changes in composition or concentration of oxychlorine phases between samples could thus potentially produce an increase in chlorobenzene, as observed between samples from Rocknest and Cumberland. However, in our experiments benzoic acid, phthalic anhydride, and chlorobenzenes increase in proportion with the amount of HCl sent to the trap, while in Cumberland samples the chlorobenzene increase showed no corresponding increase in HCl. Based on our experiments, the Tenax trap is a possible source of the traces of chlorobenzene observed at Rocknest, John Klein, and Confidence Hills. The order-of-magnitude higher chlorobenzene abundances observed at Cumberland cannot be attributed to the Tenax trap. Furthermore, we found no evidence of significant trap degradation after hundreds of experiments with Cl salt-containing analogue soils.

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Section: 1002/2015je004825mentioning

confidence: 74%

Section: 1002/2015je004825mentioning

confidence: 84%

Evaluation of the Tenax trap in the Sample Analysis at Mars instrument suite on the Curiosity rover as a potential hydrocarbon source for chlorinated organics detected in Gale Crater

et al. 2015

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“…Motivated by numerous industrial applications [167,[169][170][171], various attempts have been made to increase the efficiency of the Deacon reaction by using the chlorides and oxides of other metals including Bi, Mg, Be and V. The reverse of the Deacon reaction has also been investigated in the context of thermochemical water-splitting processes [172]. By using CuCl 2 as a catalyst, the Deacon reaction is believed to operate through the following mechanism [173]: The thermal decomposition of CuCl 2 in reaction 42 is found to be thermodynamically unfavorable, thus very low yields of CuCl are produced according to reaction 42.…”

Section: The Deacon Reactionmentioning

confidence: 99%