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Exploration, explanation and exploitation of hydroxyls in zeolites

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National Science Review 2022年第9期9卷 8-9页

作者： Eddy Dib Edwin B.Clatworthy Hugo Cruchade Izabel C.Medeiros-Costa Nikolai Nesterenko jean-pierre gilson Svetlana Mintova Laboratory of Catalysis and Spectrochemistry(LCS) Normandy University National Graduate School of Engineering of Caen(ENSICAEN) French National Center for Scientific Research(CNRS) Total Energies Research and Technology

The ideal crystalline framework of zeolites is perturbed by hydroxyl groups. In pure silica zeolites the framework is neutral, however, the introduction of Al3+into the Si4+oxide framework creates negative charges, giving rise to Br?nsted acid sites (BASs). O?ten referred to as bridged hydroxyls [Si–O(H)–Al], they are formed when a proton is bound to one of the oxygens adjacent to an aluminum.

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Hierarchical zeolites by the controlled fluoride route

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Hierarchical zeolites by the controlled fluoride route

第19届全国分子筛学术大会

作者： Zhengxing Qin Georgian Melinte Ovidiu Ersen jean-pierre gilson Svetlana Mintova Valentin Valtchev State Key Laboratory of Heavy Oil Processing College of chemical engineeringChina university of petroleum(East China) IPCMS Université de Strasbourg LCS ENSICAEN-University of Caen

＜正＞Recently,we have developed a new synthesis route to hierarchical zeolites,which is based on the etching in fluorideThe major advantage of this approach is the non selective extraction of silicon and aluminum from zeolite frameworks in a controllable *** tuning of the etching process allows controlling the stepwise framework dissolution from the extraction of a few atoms to the formation of extra-large mesopores.A

关键词： crystal engineering fluoride etching nanostructures zeolites

Performance of Single Crystals House-of-Cards-like ZSM-5 in Ethanol-to-Hydrocarbons Conversion

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Performance of Single Crystals House-of-Cards-like ZSM-5 in ...

中国化学会第十九届全国催化学术会议

作者： Zhengxing Qin Ludovic Pinard Mohammed Amine Benghalem T.jean Daou Georgian Melinte Ovidiu Ersen Shunsuke Asahina jean-pierre gilson Valentin Valtchev China University of Petroleum (East China) Jilin University

The present study reports the unbiased NHF etching of a parent(Z) ZSM-5 zeolite resulting in houseof-cards-like single crystals(Z) containing large rectangular cavities surrounded by thin(15 – 30 nm), flat and highly... 详细信息

关键词： Zeolite House-of-cards-like NH4F etching Catalysis

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莫奈的花园

等级孔的形成机理及其提高扩散和催化性能的研究

作者： (法)让－皮埃尔·吉尔森(jean-pierre gilson)摄影

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等级孔的形成机理及其提高扩散和催化性能的研究

2021第二十一届全国波谱学学术年会

作者：曾姝覃正兴 Georgian Melinte Yanfeng Shen jean-pierre gilson Valentin Valtchev Svetlana Mintova 魏迎旭刘中民徐舒涛中国科学院大连化学物理研究所洁净能源国家重点实验室中国石油大学(华东)化工学院重油加工国家重点实验室 Normandie Univ ENSICAEN UNICAEN CNRS Laboratoire Catalyse et Spectrochimie

＜正＞分子筛由于其独特的孔道结构,在石油化工,吸附分离等工业过程中受到了广泛应用。通过后处理方法移除骨架原子从而产生介孔能增强分子筛的扩散性能,为反应物或者产物创造"高速通道"[1]。近年来关于等级孔分子筛的设计,合成以及表...

＜正＞分子筛由于其独特的孔道结构,在石油化工,吸附分离等工业过程中受到了广泛应用。通过后处理方法移除骨架原子从而产生介孔能增强分子筛的扩散性能,为反应物或者产物创造"高速通道"[1]。近年来关于等级孔分子筛的设计,合成以及表征的工作很多,各种表征技术主要侧重在从不同尺度上可视化和量化介孔,但关于介孔形成机理尤其是在分子尺度上的报道甚少,例如移除骨架原子后产生的变化等。Xe原子核周围巨大的电子云对周围环境和各种相互作用非常敏感,

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等级孔的形成机理及其提高扩散和催化性能的研究

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等级孔的形成机理及其提高扩散和催化性能的研究

2021第二十一届全国波谱学学术年会

分子筛由于其独特的孔道结构,在石油化工,吸附分离等工业过程中受到了广泛应用。通过后处理方法移除骨架原子从而产生介孔能增强分子筛的扩散性能,为反应物或者产物创造"高速通道"[1]。近年来关于等级孔分子筛的设计,合成以及表征的工...

分子筛由于其独特的孔道结构,在石油化工,吸附分离等工业过程中受到了广泛应用。通过后处理方法移除骨架原子从而产生介孔能增强分子筛的扩散性能,为反应物或者产物创造"高速通道"[1]。近年来关于等级孔分子筛的设计,合成以及表征的工作很多,各种表征技术主要侧重在从不同尺度上可视化和量化介孔,但关于介孔形成机理尤其是在分子尺度上的报道甚少,例如移除骨架原子后产生的变化等。Xe原子核周围巨大的电子云对周围环境和各种相互作用非常敏感,

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Foreword to the special section on synchronous programming

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Frontiers of Computer Science 2013年第5期7卷 595-597页

作者： jean-pierre TALPIN INRIA Rennes-Bretagne-Atlantique Rennes 35042 France

1 Introduction Embedded systems are ubiquitous. In applications ranging from avionics, automotive, and industrial process control all the way to the handheld personal digital assistants （PDAs）, cell phones, and bio-...

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A meta-analytic review of Elliot's (1999) Hierarchical Model of Approach and Avoidance Motivation in the sport, physical activity, and physical education literature

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Journal of Sport and Health Science 2017年第1期6卷 68-80页

作者： Marc Lochbaum Javan jean-Noel Colleen Pinar Todd gilson Department of Health Exercise and Sport Sciences Texas Tech University Department of Kinesiology Northern Illinois University

Purpose: The purpose of this quantitative review was to summarize the state of Elliot's Hierarchical Model of Approach and Avoidance Motivation, specifically the antecedents of the 2 × 2 achievement goals in the sport, physical activity, and physical education literature. In addition,the intercorrelations amongst the 2 × 2 goals were also ***: A systematic review of the literature was conducted. Meta-analytic procedures were used with the mean weighted sample correlation(rw) as the effect size metric. The antecedents were coded by Elliot's(1999) antecedent categories. A number of moderators were coded a ***: Based on a fixed effects model from 47 published studies(total unique n = 15,413) that met inclusion criteria, the 2 × 2 achievement goals were significantly correlated amongst each other ranging from small to medium to large in meaningfulness. Concerning the antecedents, overall they were theoretically correct in associations, but only a few of the relationships were medium in meaningfulness. Most relationships were small in meaningfulness. Heterogeneity was present for the interrcorrelation and antecedent ***: Future research is encouraged to grow and enrich the understanding of achievement goals within Elliot's complete Hierarchical Model of Approach and Avoidance Motivation to include both antecedents and outcomes simultaneously to improve upon the understanding of achievement motivation in sport, exercise, and physical activity settings.

关键词： Achievement motivation Antecedents Competence Mastery goals Meta-analysis Performance goals

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Evidence of a Light-Sensing Role for Folate in Arabidopsis Cryptochrome Blue-Light Receptors

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Molecular Plant 2008年第1期1卷 68-74页

作者： Nathalie Hoang jean-pierre Bouly Margaret Ahmad Universite Paris Vl Casier 156 4 Place Jussieu 75005 Paris France Penn State University 25 Yearsley Mill Road Media PA 19063 USA

Arabidopsis cryptochromes cry1 and cry2 are blue-light signalling molecules with significant structural similarity to photolyases-a class of blue-light-sensing DNA repair enzymes. Like photolyases, purified plant cryptochromes have been shown to bind both flavin and pterin chromophores. The flavin functions as a light sensor and undergoes reduction in response to blue light that initiates the signalling cascade. However, the role of the pterin in plant cryptochromes has until now been unknown. Here, we show that the action spectrum for light-dependent degradation of cry2 has a significant peak of activity at 380 nm, consistent with absorption by a pterin cofactor. We further show that cry1 protein expressed in living insect ceils responds with greater sensitivity to 380 nm light than to 450 nm, consistent with a light-harvesting antenna pigment that transfers excitation energy to the oxidized flavin of cry1. The pterin biosynthesis inhibitor DHAP selectively reduces cryptochrome responsivity at 380 nm but not 450 nm blue light in these cell cultures, indicating that the antenna pigment is a folate cofactor similar to that of photolyases.

关键词： a Light-Sensing Role for Folate Arabidopsis Cryptochrome Blue-Light Receptors