A study of the reactions of fluorine with hydrogen and methane in the initiation phase using a miniature tubular reactor

✍ Scribed by C. Seeger; G. Rotzoll; A. Lübbert; K. Schügerl

• Publisher: John Wiley and Sons
• Year: 1981
• Tongue: English
• Weight: 882 KB
• Volume: 13
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550130105

✦ Synopsis

A small tubular reactor having an inner diameter of 1-2 mm and used as the source in a molecular beam apparatus is described in detail. This arrangement allows the study of fast reactions with reaction times smaller than 1 msec. The preexplosive reaction phase between Fz and Hz and CHI, respectively, is investigated to find out the initiation reactions. In the Fz/H2 reaction, initiation is brought about by heterogeneous generation of F atoms or some other surface reaction. Evidence is also obtained for chain branching reactions. In the F&H4 case the dominant initiation reaction is the homogeneous reaction CHI + F2 -CH:J + HF + F. The rate constant for the reaction between 300 and 400 K is 3*0 exp [-4'7 f 8 kJ/mol/RT] cm3/mol sec. The analysis of the experimental data also yields the rate constant for the propagation reaction CH3 + F2 -* CH3F + F, which is 1OI2 6*o exp[-4.6 f 2.1 kJ/mol/RT] cm3/mol sec.