XRD and FT-IR methods were applied to the studies of organic monolayer dispersionsystems. Naphthalene, borneol, benzoic acid, salicylic acid, phthalic acid and tartaric acid weremixed with γ-Al2O3 and SiO2 separately...XRD and FT-IR methods were applied to the studies of organic monolayer dispersionsystems. Naphthalene, borneol, benzoic acid, salicylic acid, phthalic acid and tartaric acid weremixed with γ-Al2O3 and SiO2 separately. The results showed that the organic compounds canalso disperse spontaneously onto the surfaces of different oxide-supports to become high dispersionstates like the behavior of inorganic salts and oxides. The organic substances studied are moreready to disperse with 1ess carboxyl or hydroxyl groups on their aromatic nucleus, suggesting themigration on the surface of the support is rate-determining during the dispersion. This point ofview is supported by the result of IR spectroscopy. The IR spectra of dispersed systems suggestthat the carboxy1 may react with the surface hydroxyl groups of the support to form salt-likestructures on the surface.展开更多
The effects of different calcination temperatures, load capacities and load methods on the monolayer dispersion of CaCl2 onto silica gel were studied by XRD. It was indicated that calcination temperature of 500℃ is e...The effects of different calcination temperatures, load capacities and load methods on the monolayer dispersion of CaCl2 onto silica gel were studied by XRD. It was indicated that calcination temperature of 500℃ is enough for the monolayer dispersion of CaCl2 onto silica gel and the monolayer dispersion threshold is the lower than 0.4g/g. The method of impregnation in aqueous solution is the more suitable than the method of dry mixture for thermal dispersion of CaCl2 onto silica gel. At the same time , it is proved by XRD and FT-IR that the skeleton structure of silica gel will be kept at the lower calcination temperature such as 500℃ but changed obviously when the sample is calcined at 600℃.展开更多
应用EXAFS类似原理,对不同负载量粉状MgO/γ-Al_2O_3负载型催化剂Mg-K边的SEELFS(Surface Extended Energy Loss Fine Structure)一阶微分谱进行数据处理,得到了Mg-Mg和Mg-O键长。研究发现,MgO在γ-Al_2O_3载体上表面自发单层分散。
文摘XRD and FT-IR methods were applied to the studies of organic monolayer dispersionsystems. Naphthalene, borneol, benzoic acid, salicylic acid, phthalic acid and tartaric acid weremixed with γ-Al2O3 and SiO2 separately. The results showed that the organic compounds canalso disperse spontaneously onto the surfaces of different oxide-supports to become high dispersionstates like the behavior of inorganic salts and oxides. The organic substances studied are moreready to disperse with 1ess carboxyl or hydroxyl groups on their aromatic nucleus, suggesting themigration on the surface of the support is rate-determining during the dispersion. This point ofview is supported by the result of IR spectroscopy. The IR spectra of dispersed systems suggestthat the carboxy1 may react with the surface hydroxyl groups of the support to form salt-likestructures on the surface.
文摘The effects of different calcination temperatures, load capacities and load methods on the monolayer dispersion of CaCl2 onto silica gel were studied by XRD. It was indicated that calcination temperature of 500℃ is enough for the monolayer dispersion of CaCl2 onto silica gel and the monolayer dispersion threshold is the lower than 0.4g/g. The method of impregnation in aqueous solution is the more suitable than the method of dry mixture for thermal dispersion of CaCl2 onto silica gel. At the same time , it is proved by XRD and FT-IR that the skeleton structure of silica gel will be kept at the lower calcination temperature such as 500℃ but changed obviously when the sample is calcined at 600℃.
文摘应用EXAFS类似原理,对不同负载量粉状MgO/γ-Al_2O_3负载型催化剂Mg-K边的SEELFS(Surface Extended Energy Loss Fine Structure)一阶微分谱进行数据处理,得到了Mg-Mg和Mg-O键长。研究发现,MgO在γ-Al_2O_3载体上表面自发单层分散。
