英语翻译Triphase Catalytic ReactionsUsing Clay IntercalatesN\1 S

英语翻译Triphase Catalytic ReactionsUsing Clay IntercalatesN\1 Shabestary\2\2 S\1 Khazaeli\3 and N\1 Long\3A naturally occurring clay mineral\1 hectorite\1 was used as the support for quaternary ammoniumcations\2 The intercalation of the cations by the clay has the advantage of separation of thecatalyst from the product by a simple \3ltration technique\2 Several quaternary ammonium cationclay intercalates have been used to investigate the e\4ects of alkyl chain length\1 size and shape ofthese catalysts in converting n\5butyl bromide to n\5butyl chloride\2 It appears that the hectoriteintercalates have a great tendency for emulsi\3cation in the presence of organic solvent \x06toluene\7and water\2 In fact\1 the emulsi\3cation being facilitated by the clay intercalates helps to bring thenucleophile from the aqueous phase into contact with the substrate\1 which is contained in theorganic phase\2 The rate of the reaction was measured for the biphase reaction \x06no supportingclay\7 and for the triphase catalytic system \x06with supporting clay\7 for comparison\2 Relativelylarge di\4erences in reactivity have been observed between the catalysts chosen in this research\2The results have indicated that quaternary ammonium with certain carbon numbers has highercatalytic activity\2