为了详尽定性和定量分析ZSM-35分子筛孔道内部和外部的酸中心,对在不同焙烧晶化条件下制备的3种ZSM-35分子筛样品(编号分别为GNJ,GNX,GW)采用NH3-TPD和吸附不同探针分子的31P MAS NMR谱进行表征,并在微反装置上对3种样品进行催化正丁烯...为了详尽定性和定量分析ZSM-35分子筛孔道内部和外部的酸中心,对在不同焙烧晶化条件下制备的3种ZSM-35分子筛样品(编号分别为GNJ,GNX,GW)采用NH3-TPD和吸附不同探针分子的31P MAS NMR谱进行表征,并在微反装置上对3种样品进行催化正丁烯异构化反应性能评价。结果表明:ZSM-35分子筛中Brnsted酸酸量远多于Lewis酸酸量,且不同制备方法得到的ZSM-35分子筛Brnsted酸强度与酸量不同;GNJ主要有1种弱Brnsted酸中心,GW有3种不同强度的Brnsted酸中心,较弱的Brnsted酸中心在孔道内部和外部均有分布,较强的两种Brnsted酸中心主要分布在孔道内部;GNX有两种不同强度的Brnsted酸中心,在孔道内部和外部均有分布,且GNX的Brnsted酸酸量高于GNJ和GW;催化正丁烯异构化反应时,ZSM-35分子筛的中强Brnsted酸中心是异丁烯生成的必要酸中心,且中强Brnsted酸中心更有利于异丁烯的生成,因此制备具有合适的中强Brnsted酸强度和酸分布的ZSM-35分子筛有利于正丁烯异构化反应的进行。展开更多
Low-lying states in odd-Z odd-mass nuclei at the proton drip-line beyond lead have recently been studied through fusion-evaporation reactions using a gas-filled recoil separator. Isomeric 1/2+and13/2+states have been ...Low-lying states in odd-Z odd-mass nuclei at the proton drip-line beyond lead have recently been studied through fusion-evaporation reactions using a gas-filled recoil separator. Isomeric 1/2+and13/2+states have been observed in odd-mass astatine and francium nuclei. The systematic behaviour of the level energies of these states have been studied and a similarity between the 1/2+state in astatine and francium has been found. Furthermore, the 13/2+state has been observed in the francium nuclei with an oblate behaviour suggesting a coupling of the i13/2proton to the 2p- 2h intruder excitation.展开更多
文摘为了详尽定性和定量分析ZSM-35分子筛孔道内部和外部的酸中心,对在不同焙烧晶化条件下制备的3种ZSM-35分子筛样品(编号分别为GNJ,GNX,GW)采用NH3-TPD和吸附不同探针分子的31P MAS NMR谱进行表征,并在微反装置上对3种样品进行催化正丁烯异构化反应性能评价。结果表明:ZSM-35分子筛中Brnsted酸酸量远多于Lewis酸酸量,且不同制备方法得到的ZSM-35分子筛Brnsted酸强度与酸量不同;GNJ主要有1种弱Brnsted酸中心,GW有3种不同强度的Brnsted酸中心,较弱的Brnsted酸中心在孔道内部和外部均有分布,较强的两种Brnsted酸中心主要分布在孔道内部;GNX有两种不同强度的Brnsted酸中心,在孔道内部和外部均有分布,且GNX的Brnsted酸酸量高于GNJ和GW;催化正丁烯异构化反应时,ZSM-35分子筛的中强Brnsted酸中心是异丁烯生成的必要酸中心,且中强Brnsted酸中心更有利于异丁烯的生成,因此制备具有合适的中强Brnsted酸强度和酸分布的ZSM-35分子筛有利于正丁烯异构化反应的进行。
基金Academy of Finland under the Finnish Center of Excellence Programmes(2006-2011,2012-2017)EURONS(European Comissiom)(RII3-CT-2004-506065)EU 7th Framework Programme(262010)(ENSAR)
文摘Low-lying states in odd-Z odd-mass nuclei at the proton drip-line beyond lead have recently been studied through fusion-evaporation reactions using a gas-filled recoil separator. Isomeric 1/2+and13/2+states have been observed in odd-mass astatine and francium nuclei. The systematic behaviour of the level energies of these states have been studied and a similarity between the 1/2+state in astatine and francium has been found. Furthermore, the 13/2+state has been observed in the francium nuclei with an oblate behaviour suggesting a coupling of the i13/2proton to the 2p- 2h intruder excitation.
