A series of NiO/SiO2 aerogel catalysts were prepared by sol gel method. The effects of the nickel content on the structure and existing forms of NiO/SiO2 aerogel catalysts were investigated by using XRD, TPR and FT IR...A series of NiO/SiO2 aerogel catalysts were prepared by sol gel method. The effects of the nickel content on the structure and existing forms of NiO/SiO2 aerogel catalysts were investigated by using XRD, TPR and FT IR. The results showed that there were interactions between NiO and SiO2. But as nickel content increased, the interaction decreased. The nickel oxide in the catalysts appeared in different forms as nickel content was changed. When the content was less than 13%, Ni? entered into the SiO2 structure completely and it became clusters after calcining. If the content altered from 20% to 50%, NiO existed as both microcrystal and clusters, the later spices was dominating. However, when the content increased to 70%, microcrystal became the primary components.展开更多
分别以正硅酸乙酯、硝酸镍为硅源和镍源 ,采用溶胶 -凝胶法 ,经超临界流体干燥和普通干燥制备了Ni O- A- Si O2 、 Ni O- G- Si O2 催化剂 ;以气凝胶和干凝胶为载体 ,采用浸渍法制备了 Ni O/ A- Si O2 、 Ni O/ G- Si O2 催化剂 .并用 ...分别以正硅酸乙酯、硝酸镍为硅源和镍源 ,采用溶胶 -凝胶法 ,经超临界流体干燥和普通干燥制备了Ni O- A- Si O2 、 Ni O- G- Si O2 催化剂 ;以气凝胶和干凝胶为载体 ,采用浸渍法制备了 Ni O/ A- Si O2 、 Ni O/ G- Si O2 催化剂 .并用 XRD、 TEM、 BET、 TPR等手段 ,研究了制备方法对催化剂织构、结构和 Ni物种存在形态的影响 .发现Ni O- A- Si O2 和 Ni O- G- Si O2 催化剂上高度分散的 Ni O簇团与 Si O2 之间有较强的相互作用 ,其顺酐液相选择加氢转化率低于 10 % ;Ni O/ G- Si O2 催化剂上 ,以单一物种形态存在的 Ni O与 Si O2 相互作用弱 ,顺酐转化率为 42 % ;Ni O/ A- Si O2 催化剂上 ,以多种形态存在的微晶 Ni O与 Si O2 间的相互作用较复杂 ,其顺酐液相选择加氢的转化率和丁二酸酐的选择性分别可达 10 0 %和 98%展开更多
文摘A series of NiO/SiO2 aerogel catalysts were prepared by sol gel method. The effects of the nickel content on the structure and existing forms of NiO/SiO2 aerogel catalysts were investigated by using XRD, TPR and FT IR. The results showed that there were interactions between NiO and SiO2. But as nickel content increased, the interaction decreased. The nickel oxide in the catalysts appeared in different forms as nickel content was changed. When the content was less than 13%, Ni? entered into the SiO2 structure completely and it became clusters after calcining. If the content altered from 20% to 50%, NiO existed as both microcrystal and clusters, the later spices was dominating. However, when the content increased to 70%, microcrystal became the primary components.
文摘分别以正硅酸乙酯、硝酸镍为硅源和镍源 ,采用溶胶 -凝胶法 ,经超临界流体干燥和普通干燥制备了Ni O- A- Si O2 、 Ni O- G- Si O2 催化剂 ;以气凝胶和干凝胶为载体 ,采用浸渍法制备了 Ni O/ A- Si O2 、 Ni O/ G- Si O2 催化剂 .并用 XRD、 TEM、 BET、 TPR等手段 ,研究了制备方法对催化剂织构、结构和 Ni物种存在形态的影响 .发现Ni O- A- Si O2 和 Ni O- G- Si O2 催化剂上高度分散的 Ni O簇团与 Si O2 之间有较强的相互作用 ,其顺酐液相选择加氢转化率低于 10 % ;Ni O/ G- Si O2 催化剂上 ,以单一物种形态存在的 Ni O与 Si O2 相互作用弱 ,顺酐转化率为 42 % ;Ni O/ A- Si O2 催化剂上 ,以多种形态存在的微晶 Ni O与 Si O2 间的相互作用较复杂 ,其顺酐液相选择加氢的转化率和丁二酸酐的选择性分别可达 10 0 %和 98%
