【摘要】 采用硅胶负载Keggin型H6PMo9V3O40催化水杨醛与硝酸反应合成5-硝基水杨醛,考察了催化剂负载量、反应时间、反应温度、催化剂用量、硝酸用量和溶剂对反应的影响及催化剂的重复使用性能。实验结果表明,m(水杨醛)∶m(质量分数65%硝酸)∶m(负载量20%H6PMo9V3O40/SiO2)=2.44∶3.00∶3.00,用石油醚作为溶剂,45℃反应2.5 h,水杨醛的转化率为98%,5-硝基水杨醛的选择性为96.8%。催化剂回收容易,重复使用5次后,活性基本不变。更多还原

【Abstract】 5-Nitrosalicylaldehyde was synthesized by the nitration of salicylaldehyde with nitric acid over H6PMo9V3O40 supported on silica gel.The effects of parameters were investigated,such as H6PMo9V3O40 loading,reaction time,temperature,solvent,and so on.Under the optimal conditions:m(salicylaldehyde)∶ m(65%HNO3)∶ m(20% H6PMo9V3O40/SiO2)=2.44∶ 3.00∶ 3.00,in petroleum ether at 45 ℃ for 2.5 h,the conversion of salicylaldehyde was 98%,the selectivity of 5-nitrosalicylaldehyde was up to 96.8%.The catalyst could be recovered easily and reused for five times without noticeable drop in activity.更多还原