Extra-large pore zeolites clear the way for the synthesis of fine chemicals and bulky compounds unable to enter the channels of medium-and large-pore zeolites.However,such extra-large pore zeolites rarely contain cata...Extra-large pore zeolites clear the way for the synthesis of fine chemicals and bulky compounds unable to enter the channels of medium-and large-pore zeolites.However,such extra-large pore zeolites rarely contain catalytically active elements and often show limited stability.In this study,we modified the Reverse assembly–disassembly–organisation–reassembly(ADOR)process to prepare extra-large pore zeolite UTL from layered IPC-1P while simultaneously incorporating a high amount of aluminium(reaching Si/Al=15)into the framework.Using this modified Reverse ADOR approach,we significantly reduced the synthesis time of alumino-germanosilicate UTL from the 28 days needed for direct synthesis to only 24 hours for reconstruction and 14 days in total.Furthermore,in the tetrahydropyranylation of 1-decanol over the reconstructed UTL zeolite,directly synthesised UTL and commercial Beta zeolite,used as a reference,reconstructed UTL provided conversion up to 61.4%,outperforming directly synthesised UTL and Beta with 14.8 and 0%conversion,respectively.The modified Reverse ADOR procedure enables us to introduce mesoporosity into zeolites,which further improves their catalytic performance by facilitating active site accessibility.展开更多
1 Scientists at the Monterey Bay Aquarium Research Institute(MBARI)have discovered a previously unknown kind of snailfish living over 3.27 kilometers below the surface of the Pacific Ocean.But if you were imagining a ...1 Scientists at the Monterey Bay Aquarium Research Institute(MBARI)have discovered a previously unknown kind of snailfish living over 3.27 kilometers below the surface of the Pacific Ocean.But if you were imagining a large,scary creature—you'd be wrong.One researcher described the fish as“adorable”.展开更多
基金the Czech Science Foundation for funding this research through project EXPRO(19-27551X)OP VVV“Excellent Research Teams”,project no.CZ.02.1.01/0.0/0.0/15_003/0000417-CUCAM.OV acknowledges the support from the project“Grant Schemes at CU”(reg.no.CZ.02.2.69/0.0/0.0/19_073/0016935)the Czech Science Foundation for the project 19-21534S.
文摘Extra-large pore zeolites clear the way for the synthesis of fine chemicals and bulky compounds unable to enter the channels of medium-and large-pore zeolites.However,such extra-large pore zeolites rarely contain catalytically active elements and often show limited stability.In this study,we modified the Reverse assembly–disassembly–organisation–reassembly(ADOR)process to prepare extra-large pore zeolite UTL from layered IPC-1P while simultaneously incorporating a high amount of aluminium(reaching Si/Al=15)into the framework.Using this modified Reverse ADOR approach,we significantly reduced the synthesis time of alumino-germanosilicate UTL from the 28 days needed for direct synthesis to only 24 hours for reconstruction and 14 days in total.Furthermore,in the tetrahydropyranylation of 1-decanol over the reconstructed UTL zeolite,directly synthesised UTL and commercial Beta zeolite,used as a reference,reconstructed UTL provided conversion up to 61.4%,outperforming directly synthesised UTL and Beta with 14.8 and 0%conversion,respectively.The modified Reverse ADOR procedure enables us to introduce mesoporosity into zeolites,which further improves their catalytic performance by facilitating active site accessibility.
文摘1 Scientists at the Monterey Bay Aquarium Research Institute(MBARI)have discovered a previously unknown kind of snailfish living over 3.27 kilometers below the surface of the Pacific Ocean.But if you were imagining a large,scary creature—you'd be wrong.One researcher described the fish as“adorable”.
文摘通过分析中国深空网首次ΔDOR(Delta Differential One-way Ranging,双差分单向测距)联合测轨试验的干涉测量事后数据,重点从观测量随机精度、闭合时延等方面讨论了国内深空网与国内VLBI(Very Long Baseline Interferometry,甚长基线干涉测量)观测网、国内深空网与国际深空网的联合干涉处理情况,并与ESOC(European Space Operation Center,欧洲空间操作中心)数据处理结果进行了比对。试验结果表明:我国深空网已具备独立或联合开展深空探测器导航测轨的系统支持能力;深空站系统具备高速率数据接收、采集、记录、传输能力,采集数据处理精度优于1ns;深空网干涉测量信号处理中心具备多体制信号的干涉处理分析能力,其分析精度与ESOC处理精度差异在0.1ns量级。
