基于酸碱协同催化设计思想,以结构类似的三聚氰胺和六氯环三磷腈热缩聚制备了P掺杂的C_(3)N_(4)材料。利用SEM和BET分析P掺入前后材料的结构,发现P掺入后材料变为直径约为5μm的球状结构,比表面积由8.2 m^(2)/g增加至11.9 m^(2)/g。采用...基于酸碱协同催化设计思想,以结构类似的三聚氰胺和六氯环三磷腈热缩聚制备了P掺杂的C_(3)N_(4)材料。利用SEM和BET分析P掺入前后材料的结构,发现P掺入后材料变为直径约为5μm的球状结构,比表面积由8.2 m^(2)/g增加至11.9 m^(2)/g。采用XPS和^(31)P MAS NMR证明P以P-OH和P=O键形式进入三嗪结构骨架中。将P掺杂的C_(3)N_(4)材料作为无金属多相催化剂应用于碱催化反应中。采用硝酸将部分P-OH氧化为P=O,探讨了P种类和数量对环氧丙烷与CO_(2)环加成反应、碳酸丙烯酯与甲醇酯交换反应以及苯甲醛与丙二腈Knoevenagel反应的影响,结合XPS和^(31)P MAS NMR表征结果发现P-OH的引入有利于CO_(2)环加成反应、酯交换反应和Knoevenagel反应的进行。展开更多
EAT Bananas Often—Bananas are rich in vitamins A, B, C, E, and many mineral substances like iron and phosphorus that help to balance the acidity and alkalinity of your body. It is one of the best health foods to refr...EAT Bananas Often—Bananas are rich in vitamins A, B, C, E, and many mineral substances like iron and phosphorus that help to balance the acidity and alkalinity of your body. It is one of the best health foods to refresh you and ease your mind. Drink Milk Everyday—Milk contains high levels of calcium and is very nutritious. Drinking a cup of milk helps you to absorb 3 grams more protein. The drink does good展开更多
文摘基于酸碱协同催化设计思想,以结构类似的三聚氰胺和六氯环三磷腈热缩聚制备了P掺杂的C_(3)N_(4)材料。利用SEM和BET分析P掺入前后材料的结构,发现P掺入后材料变为直径约为5μm的球状结构,比表面积由8.2 m^(2)/g增加至11.9 m^(2)/g。采用XPS和^(31)P MAS NMR证明P以P-OH和P=O键形式进入三嗪结构骨架中。将P掺杂的C_(3)N_(4)材料作为无金属多相催化剂应用于碱催化反应中。采用硝酸将部分P-OH氧化为P=O,探讨了P种类和数量对环氧丙烷与CO_(2)环加成反应、碳酸丙烯酯与甲醇酯交换反应以及苯甲醛与丙二腈Knoevenagel反应的影响,结合XPS和^(31)P MAS NMR表征结果发现P-OH的引入有利于CO_(2)环加成反应、酯交换反应和Knoevenagel反应的进行。
文摘EAT Bananas Often—Bananas are rich in vitamins A, B, C, E, and many mineral substances like iron and phosphorus that help to balance the acidity and alkalinity of your body. It is one of the best health foods to refresh you and ease your mind. Drink Milk Everyday—Milk contains high levels of calcium and is very nutritious. Drinking a cup of milk helps you to absorb 3 grams more protein. The drink does good
