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
For integers k 0, r 0, a（k, r）-coloring of a graph G is a proper k-coloring of the vertices such that every vertex of degree d is adjacent to vertices with at least min{d, r} diferent colors. The r-hued chromatic nu...For integers k 0, r 0, a（k, r）-coloring of a graph G is a proper k-coloring of the vertices such that every vertex of degree d is adjacent to vertices with at least min{d, r} diferent colors. The r-hued chromatic number, denoted by χr（G）, is the smallest integer k for which a graph G has a（k, r）-coloring. Define a graph G is r-normal, if χr（G） = χ（G）. In this paper, we present two sufcient conditions for a graph to be 3-normal, and the best upper bound of 3-hued chromatic number of a certain families of graphs.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%。
基金Supported by the Project of Shandong Province Higher Educational Science and Technology Program (Grant No.J10LA11)the Natural Science Foundation of Shandong Province (Grant No.ZR2010AQ003)
文摘For integers k 0, r 0, a（k, r）-coloring of a graph G is a proper k-coloring of the vertices such that every vertex of degree d is adjacent to vertices with at least min{d, r} diferent colors. The r-hued chromatic number, denoted by χr（G）, is the smallest integer k for which a graph G has a（k, r）-coloring. Define a graph G is r-normal, if χr（G） = χ（G）. In this paper, we present two sufcient conditions for a graph to be 3-normal, and the best upper bound of 3-hued chromatic number of a certain families of graphs.
