提出了应用高效NaY沸石导向剂快速合成A型沸石的新方法.在合成过程中,NaY沸石导向剂提供了全部硅源(无需另加硅源).与用水玻璃提供硅源的合成方法相比,该法晶化速度快,合成温度低,并可在低碱度条件下合成超细A型沸石.29S i NMR表征和UV ...提出了应用高效NaY沸石导向剂快速合成A型沸石的新方法.在合成过程中,NaY沸石导向剂提供了全部硅源(无需另加硅源).与用水玻璃提供硅源的合成方法相比,该法晶化速度快,合成温度低,并可在低碱度条件下合成超细A型沸石.29S i NMR表征和UV Ram an研究表明,高效NaY沸石导向剂中含有大量的六元环等低分子量硅铝酸根前驱体,它们有利于A型沸石成核与晶体生长.展开更多
This work describes a novel method to synthesize NaY zeolite at high temperature(100-140 ℃)by using NaY seeds solution as a silica source,which is also a method for the activation of silica source in the synthesis of...This work describes a novel method to synthesize NaY zeolite at high temperature(100-140 ℃)by using NaY seeds solution as a silica source,which is also a method for the activation of silica source in the synthesis of NaY zeolite.Conventionally,the synthesis temperature of NaY zeolite from water glass is about 100 ℃,and higher temperature(>100 ℃)leads to the formation of impurity.However,this work shows that high-temperature synthesis(100-140 ℃)still exhibits a pure phase NaY.It is very interesting that,compared with conventional temperature,high-temperature in the synthesis of NaY zeolite has obvious advantages such as short crystallization time and high n(Si)/n(Al)ratio in the product.More importantly,this method is possible to extend to the synthesis of NaA,NaX,Ω,ECR-1and MOR.展开更多
针对负载杂多酸催化剂在极性反应体系中活性组分易溶脱的难题,用"瓶中造船(ship in the bottle)"的方法在NaY沸石超笼中合成了12-钼磷酸.将机械混和的MoO3晶体和NaY沸石在高温下焙烧,使MoO3在沸石表面高度分散,以此复合物在...针对负载杂多酸催化剂在极性反应体系中活性组分易溶脱的难题,用"瓶中造船(ship in the bottle)"的方法在NaY沸石超笼中合成了12-钼磷酸.将机械混和的MoO3晶体和NaY沸石在高温下焙烧,使MoO3在沸石表面高度分散,以此复合物在磷酸水溶液中反应,得到的固体样品用X射线衍射仪(XRD)、31P核磁共振谱(31PNMR)和红外光谱(IR)进行了表征,并测试了其在醋酸和正丁醇的酯化反应中的催化性能.结果表明,MoO3质量分数为10%的MoO3/NaY中载体仍保持Y沸石的结构,以此为原料合成的样品呈现出Keggin结构杂多酸的红外特征峰,并且在核磁共振磷谱中杂多酸的化学位移峰向负值方向发生了较大程度的位移,说明杂多阴离子与Y沸石羟基发生了强相互作用,样品在醋酸与正丁醇的酯化反应中显示出了较高的催化活性和优异的重复使用性能.这些充分说明在NaY沸石超笼中成功合成了12-钼磷酸。展开更多
文摘提出了应用高效NaY沸石导向剂快速合成A型沸石的新方法.在合成过程中,NaY沸石导向剂提供了全部硅源(无需另加硅源).与用水玻璃提供硅源的合成方法相比,该法晶化速度快,合成温度低,并可在低碱度条件下合成超细A型沸石.29S i NMR表征和UV Ram an研究表明,高效NaY沸石导向剂中含有大量的六元环等低分子量硅铝酸根前驱体,它们有利于A型沸石成核与晶体生长.
文摘This work describes a novel method to synthesize NaY zeolite at high temperature(100-140 ℃)by using NaY seeds solution as a silica source,which is also a method for the activation of silica source in the synthesis of NaY zeolite.Conventionally,the synthesis temperature of NaY zeolite from water glass is about 100 ℃,and higher temperature(>100 ℃)leads to the formation of impurity.However,this work shows that high-temperature synthesis(100-140 ℃)still exhibits a pure phase NaY.It is very interesting that,compared with conventional temperature,high-temperature in the synthesis of NaY zeolite has obvious advantages such as short crystallization time and high n(Si)/n(Al)ratio in the product.More importantly,this method is possible to extend to the synthesis of NaA,NaX,Ω,ECR-1and MOR.
文摘针对负载杂多酸催化剂在极性反应体系中活性组分易溶脱的难题,用"瓶中造船(ship in the bottle)"的方法在NaY沸石超笼中合成了12-钼磷酸.将机械混和的MoO3晶体和NaY沸石在高温下焙烧,使MoO3在沸石表面高度分散,以此复合物在磷酸水溶液中反应,得到的固体样品用X射线衍射仪(XRD)、31P核磁共振谱(31PNMR)和红外光谱(IR)进行了表征,并测试了其在醋酸和正丁醇的酯化反应中的催化性能.结果表明,MoO3质量分数为10%的MoO3/NaY中载体仍保持Y沸石的结构,以此为原料合成的样品呈现出Keggin结构杂多酸的红外特征峰,并且在核磁共振磷谱中杂多酸的化学位移峰向负值方向发生了较大程度的位移,说明杂多阴离子与Y沸石羟基发生了强相互作用,样品在醋酸与正丁醇的酯化反应中显示出了较高的催化活性和优异的重复使用性能.这些充分说明在NaY沸石超笼中成功合成了12-钼磷酸。
基金National Natural Science Foundation of China(52202076)Youth Innovation Promotion Association CAS(2023261)Shanghai“Super Postdoctoral Fellow”Incentive Program(2020474)。
