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
The composite,prepared with polypropylene grafting maleic anhydride and silica crosslinked by 3 aminopropyltriethyoxysilane,was used as the carrier to support titanium chloride.XPS and FTIR measurements were emplyed t...The composite,prepared with polypropylene grafting maleic anhydride and silica crosslinked by 3 aminopropyltriethyoxysilane,was used as the carrier to support titanium chloride.XPS and FTIR measurements were emplyed to investigate the states of several atoms during stepwise supporting catalyst for clarifying the mechanism.The results showed two possible mechanisms of active catalytic sites on the composite carrier:the catalytic sites bridged through MAO on the inorganic silica gel;on contrary,the catalytic sites bridging with carbonyls of amide formed in the composite.展开更多
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
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The composite,prepared with polypropylene grafting maleic anhydride and silica crosslinked by 3 aminopropyltriethyoxysilane,was used as the carrier to support titanium chloride.XPS and FTIR measurements were emplyed to investigate the states of several atoms during stepwise supporting catalyst for clarifying the mechanism.The results showed two possible mechanisms of active catalytic sites on the composite carrier:the catalytic sites bridged through MAO on the inorganic silica gel;on contrary,the catalytic sites bridging with carbonyls of amide formed in the composite.
基金supported by the National Natural Science Foundation of China(21703194)the Natural Science Foundation of Jiangsu Province(BK20171168,BK20171169)+2 种基金Natural Science Foundation of Jiangsu Higher Education Institutions of China(17KJB530010,17KJB150038 and18KJA430015)Key Research Project of Social Development of Xuzhou(KC17154)Research Project of Xuzhou University of Technology(XKY2017217)
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.
