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研究了Pt(NH_3)_4NaY,Pd(NH_3)_4NaY及Co(NH_3)_6NaY沸石在不同热处理条件下红外谱图变化的规律。发现该沸石晶穴中这些络离子在250℃下抽空1小时,其结构均破坏;若再在400～500℃区间加热1小时,其表面均有Si—H键生成,并讨论了Si—H键生成的机理。用D_2交换法证明了这些络离子破坏后,在PtNaY,PdNaY及CoNaY沸石表面分别有Pt-H,Pd—H及Co—H键存在,它们是由于NH_3在这些沸石表面高温分解所放出的H吸附在这些金属离子上的结果。由IR与ESR法证明室温下于NaY沸石晶穴中可合成出[Co(NH_3)_5O_2]~(2+)与[Co(NH_2CH_2CH_2NH_2)_2O_2]~(2+)离子;在适当的条件下,于Y型沸石表面可合成出一种特殊的Co络合物载氧体,ESR证明它易将2,6-二特丁基对甲酚氧化成自由基。
The changes of infrared spectra of Pt (NH_3) _4NaY, Pd (NH_3) _4NaY and Co (NH_3) _6NaY zeolites under different heat treatments were studied. It was found that these zeolites were evacuated for one hour at 250 ℃, and their structures were destroyed. If they were heated in the range of 400-500 ℃ for 1 hour, Si-H bonds were formed on the surface of Si-H Key generation mechanism. D_2 exchange method proved that after the destruction of these complex ions, Pt-H, Pd-H and Co-H bonds exist on the surface of PtNaY, PdNaY and CoNaY zeolites, respectively. These are due to the release of H on the surface of these zeolites The result of adsorption on these metal ions. It was proved by IR and ESR that [Co (NH_3) _5O_2] 2+ and [Co (NH_2CH_2CH_2NH_2) __O_2] ~2 + ions could be synthesized in the NaY zeolite crystal at room temperature. Under appropriate conditions, A special kind of Co complex oxygen carrier can be synthesized on the surface of Y zeolite. ESR proved that it is easy to oxidize 2,6-di-tert-butyl-p-cresol to free radicals.