ZnO/SiO\-2 and ZnO\|SiO\-2 catalysts were prepared by the impregnation and sol\|gel method, respectively. The characterization of the catalysts by XPS and FTIR indicated that much "free" zinc oxide and unrea...ZnO/SiO\-2 and ZnO\|SiO\-2 catalysts were prepared by the impregnation and sol\|gel method, respectively. The characterization of the catalysts by XPS and FTIR indicated that much "free" zinc oxide and unreacted Si\_OH existed on the surface of ZnO/SiO\-2 sample. As for ZnO\|SiO\-2 sol\|gel catalyst, the corresponding phenomena were not observed. The prepared samples were also used as the catalysts for decomposition of 2\|butanol. A high selectivity for dehydrogenation was observed over the supported catalyst. However, a high selectivity for dehydration was shown over the ZnO\|SiO\-2 sol\|gel catalyst. The opposite selectivity for dehydration or dehydrogenation observed over the two kinds of catalysts may be just because of the different surface structures of the catalysts.展开更多
To obtain a novel support with practical value for metallocene catalyst(\%η\%\|C\-5H\-5)TiCl\-3(CpTiCl\-3), poly(styrene\|co\|4\|vinylpyridine)/SiO\-2 nanoscale hybrid material(SrP/SiO\-2) was firstly produced as sup...To obtain a novel support with practical value for metallocene catalyst(\%η\%\|C\-5H\-5)TiCl\-3(CpTiCl\-3), poly(styrene\|co\|4\|vinylpyridine)/SiO\-2 nanoscale hybrid material(SrP/SiO\-2) was firstly produced as support. After pretreatment by methylaluminoxane(MAO), the hybrid materials reacted with CpTiCl\-3. The results from SAXS, SEM and TEM indicated the morphology and structure of organic/inorganic hybrid materials, and the size of inorganic particle in hybrid was nanoscale. The results from IR and XPS showed that there were two possible cationic active species in the hybrid\|supported catalyst, the polymerization results of styrene proved this possibility.展开更多
用浸渍法制得0.2%铁元素改性的SiO2为载体负载5%Pd催化剂,用于3-硝基三氟甲苯常压催化加氢合成3-三氟甲基苯胺,用沸点、元素分析、IR和1 H NMR对它的结构表征为目标产物;确定优化工艺条件为:0.1mol硝基物,0.26g催化剂,80mL无水乙醇作溶...用浸渍法制得0.2%铁元素改性的SiO2为载体负载5%Pd催化剂,用于3-硝基三氟甲苯常压催化加氢合成3-三氟甲基苯胺,用沸点、元素分析、IR和1 H NMR对它的结构表征为目标产物;确定优化工艺条件为:0.1mol硝基物,0.26g催化剂,80mL无水乙醇作溶剂,反应温度为50℃,0.1MPa下加氢反应3h,收率为97.8%,产物的纯度达98.2%。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ZnO/SiO\-2 and ZnO\|SiO\-2 catalysts were prepared by the impregnation and sol\|gel method, respectively. The characterization of the catalysts by XPS and FTIR indicated that much "free" zinc oxide and unreacted Si\_OH existed on the surface of ZnO/SiO\-2 sample. As for ZnO\|SiO\-2 sol\|gel catalyst, the corresponding phenomena were not observed. The prepared samples were also used as the catalysts for decomposition of 2\|butanol. A high selectivity for dehydrogenation was observed over the supported catalyst. However, a high selectivity for dehydration was shown over the ZnO\|SiO\-2 sol\|gel catalyst. The opposite selectivity for dehydration or dehydrogenation observed over the two kinds of catalysts may be just because of the different surface structures of the catalysts.
文摘To obtain a novel support with practical value for metallocene catalyst(\%η\%\|C\-5H\-5)TiCl\-3(CpTiCl\-3), poly(styrene\|co\|4\|vinylpyridine)/SiO\-2 nanoscale hybrid material(SrP/SiO\-2) was firstly produced as support. After pretreatment by methylaluminoxane(MAO), the hybrid materials reacted with CpTiCl\-3. The results from SAXS, SEM and TEM indicated the morphology and structure of organic/inorganic hybrid materials, and the size of inorganic particle in hybrid was nanoscale. The results from IR and XPS showed that there were two possible cationic active species in the hybrid\|supported catalyst, the polymerization results of styrene proved this possibility.
文摘用浸渍法制得0.2%铁元素改性的SiO2为载体负载5%Pd催化剂,用于3-硝基三氟甲苯常压催化加氢合成3-三氟甲基苯胺,用沸点、元素分析、IR和1 H NMR对它的结构表征为目标产物;确定优化工艺条件为:0.1mol硝基物,0.26g催化剂,80mL无水乙醇作溶剂,反应温度为50℃,0.1MPa下加氢反应3h,收率为97.8%,产物的纯度达98.2%。
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%
