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摘要: 二苯并噻吩(DBT)在80 ℃下，保持24 h即可在催化剂表面发生自发单层分散，通过XRD分析测定其分散阈值为0.23 gDBT/g MoO3/γ-Al2O3，大于经计算得出的0.15 g/g的平躺吸附密置单层分散容量，在排除实验误差后，推测DBT在MoO3/γ-Al2O3表面存在通过硫原子的端连吸附，FT-IR分析结果与上述推测相一致，分析认为DBT可能通过硫原子吸附在MoO3/γ-Al2O3表面的酸中心上。Abstract: Dibenzothiophene(DBT) can disperse spontaneously on the surface of MoO3/γ-Al2O3 catalyst under 80 ℃ and 24 h. It is determined by XRD that the dispersion threshold of DBT on MoO3/γ-Al2O3 catalyst is 0.23 g/g. This value is obviously higher than the calculated value of monolayer dispersion of DBT assuming that DBT adsorbed flatly on the surface of MoO3/γ-Al2O3 catalyst. It is inferred from this result that the adsorption of DBT on the surface of MoO3/γ-Al2O3 catalyst may include both two status, one is the end-on manner through the adsorption of sulfur atom, another is the flat manner through the adsorption of π electrons of DBT molecule. The result of FT-IR analysis does not contradict with the inference. DBT may be adsorption on the acidic sites in the surface of MoO3/γ-Al2O3 catalyst via sulfur atom.
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Key words:
- dibenzothiophene /
- MoO3/γ-Al2O3 catalyst /
- spontaneous monolayer dispersion /
- XRD /
- FT-IR /
- adsorption state /
- acidic sites
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