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| 1 | Effects of Potassium and Manganese Promoters on Nitrogen-Doped Carbon Nanotube-Supported Iron Catalysts for CO_2 Hydrogenation显示文摘氮掺杂碳纳米管(NCNTs)作为载体负载铁(Fe)纳米颗粒,可应用于CO_2多相催化加氢反应(633 K和25 bar)。当将钾(K)和锰(Mn)作为助催化剂时,Fe/NCNT展现出优异的CO_2加氢性能,在体积空速(GHSV)为3.1 L·g^(–1)·h^(–1)时转化率可达34.9%。当使用K作为助催化剂时,反应对烯烃和短链烷烃具有高的选择性。当K和Mn同时作为助催化剂时,其催化活性能够稳定地维持60 h。助催化剂Mn的结构效应通过X射线衍射、氢气程序升温还原以及近边X射线吸收精细结构进行表征。助催化剂Mn不仅能够稳定中间态FeO,且能降低程序升温还原的起始温度。通过探针反应NH3的催化分解来表征助催化剂效应。当K和Mn作为助催化剂时,Fe/NCNT具有最好的催化活性。在还原条件下,当K作为助催化剂时,Fe/NCNT具有最优异的热稳定性。 | Praewpilin Kangvansura Ly May Chew Chanapa Kongmark Phatchada Santawaja Holger Ruland Wei Xia Hans Schulz Attera Worayingyong Martin Muhler | 2017 | Engineering2017，3，3： | 6 |
| 2 | Nickel nanoparticles supported on nitrogen-doped carbon nanotubes are a highly active,selective and stable CO_(2) methanation catalyst显示文摘CO_(2) methanation using nickel-based catalysts has attracted large interest as a promising power-to-gas route.Ni nanoparticles supported on nitrogen-doped CNTs with Ni loadings in the range from 10 wt% to 50 wt% were synthesized by impregnation,calcination and reduction and characterized by elemental analysis,X-ray powder diffraction,H_(2) temperature-programmed reduction,CO pulse chemisorption and transmission electron microscopy.The Ni/NCNT catalysts were highly active in CO_(2) methanation at atmospheric pressure,reaching over 50% CO_(2) conversion and over 95% CH_(4) selectivity at 340℃ and a GHSV of50,000 mL g^(-1) h^(-1) under kinetically controlled conditions.The small Ni particle sizes below 10 nm despite the high Ni loading is ascribed to the efficient anchoring on the N-doped CNTs.The optimum loading of 30 wt%-40 wt% Ni was found to result in the highest Ni surface area,the highest degree of conversion and the highest selectivity to methane.A constant TOF of 0.3 s^(-1) was obtained indicating similar catalytic properties of the Ni nanoparticles in the range from 10 wt%to 50 wt% Ni loading.Long-term experiments showed that the Ni/NCNT catalyst with 30 wt% Ni was highly stable for 100 h time on stream. | Julian Godde Mariia Merko Wei Xia Martin Muhler | 2021 | Journal of Energy Chemistry2021，30，3： | 4 |
| 3 | 甘油氧化的光谱电化学傅里叶变换衰减全反射谱红外光谱薄膜流动池中硼酸镍层厚度的优化显示文摘在碱性甘油电氧化反应中,利用电化学傅里叶变换衰减全反射谱红外光谱法,研究了薄膜流动池中滴注硼酸镍催化剂负载量对玻碳电极性能的影响.连续操作的径向流动池包括一个位于内反射元件上方50μm的钻孔电极,可实现红外光谱分析.这是在确定条件下对电催化剂进行简便和可重复筛选的一个适合的方法,同时还提供了对复杂反应(如甘油氧化)产物选择性的检测.通过对泵送电解液进行更耗时的定量高效液相色谱分析,结果表明,衰减全反射红外光谱法可快速鉴定产物.在层流条件下,水中使用0.1 M甘油和1 M KOH,流速为5μL min^(-1)时,甘油转化率较高.转化率和选择性取决于催化剂的负载量,负载量又决定了催化剂层的厚度和粗糙度.由于在更粗糙的膜中停留时间更长有利于再吸附和C-C键断裂,因此当负载量最高达210μg cm^(-2)时,甘油转化率为73%且甲酸选择性接近80%.当最低负载量为13μg cm^(-2)时,甘油转化率达到63%,甲酸选择性降至60%,相应地,C_(2)物种(如乙醇酸盐)选择性较高,为8%.因此,只有催化剂负载量较低时才能形成几微米厚度范围内的薄膜,此时才适合进行优质催化剂的筛选. | Steffen Cychy Sebastian Lechler Zijian Huang Michael Braun Ann Cathrin Brix Peter Blümler Corina Andronescu Friederike Schmid Wolfgang Schuhmann Martin Muhler | 2021 | Chinese Journal of Catalysis2021，42，12： | 2 |
| 4 | Purified oxygenand nitrogen-modified multi-walled carbon nanotubes as metal-free catalysts for selective olefin hydrogenation显示文摘Oxygen-and nitrogen-functionalized carbon nanotubes (OCNTs and NCNTs) were applied as metal-free catalysts in selective olefin hydrogenation. A series of NCNTs was synthesized by NH3 post-treatment of OCNTs. Temperature-programmed desorption, N2 physisorption, Raman spectroscopy, high-resolution transmission electron microscopy and X-ray photoelectron spectroscopy were employed to characterize the surface properties of OCNTs and NCNTs, aiming at a detailed analysis of the type and amount of oxygenand nitrogen-containing groups as well as surface defects. The gas-phase treatments applied for oxygen and nitrogen functionalization at elevated temperatures up to 600 C led to the increase of surface defects, but did not cause structural damages in the bulk. NCNTs showed a clearly higher activity than the pristine CNTs and OCNTs in the hydrogenation of 1,5-cyclooctadiene, and also the selectivity to cyclooctene was higher. The favorable catalytic properties are ascribed to the nitrogen-containing surface functional groups as well as surface defects related to nitrogen species. In contrast, oxygen-containing surface groups and the surface defects caused by oxygen species did not show clear contribution to the hydrogenation catalysis. | Peirong Chen Ly May Chew Aleksander Kostka Kunpeng Xie Martin Muhler Wei Xia | 2013 | Journal of Energy Chemistry2013，22，2： | 2 |
| 5 | N-doped carbon synthesized from N-containing polymers as metal-free catalysts for the oxygen reduction under alkaline conditions显示文摘 | Anqi Zhao Justus Masa Martin Muhler Wolfgang Schuhmann Wei Xia | 2013 | Electrochimica Acta2013，，： | 1 |
| 6 | CO Oxidation over Supported Gold Catalysts—“Inert” and “Active” Support Materials and Their Role for the Oxygen Supply during Reaction显示文摘 | Markus M Schubert Stefan Hackenberg Andre C van Veen Martin Muhler Vojtech Plzak R.Jürgen Behm | 2001 | Journal of Catalysis2001，，1： | 1 |
| 7 | Au/ZnO as catalyst for methanol synthesis: The role of oxygen vacancies显示文摘 | Jennifer Strunk Kevin Kehler Xinyu Xia Massimiliano Comotti Ferdi Schuth Thomas Reineeke and Martin Muhler | 2009 | Applied Catalysis A: General Volume 359 Issues 1-22009，，： | 1 |
| 8 | State-of-the-art progress in the selective photo-oxidation of alcohols显示文摘Photocatalytic oxidation of alcohols has received more and more attention in recent years following the numerous studies on the degradation of pollutants, hydrogen evolution, and CO_(2) reduction by photocatalysis. Instead of the total oxidation of organics in the degradation process, the photo-oxidation of alcohols aims at the selective conversion of alcohols to produce carbonyl/acid compounds. Promising results have been achieved in designing the catalysts and reaction system, as well as in the mechanistic investigations in the past few years. This review summarizes the state-of-the-art progress in the photo-oxidation of alcohols, including the development of photocatalysts and cocatalysts, reaction conditions including the solvent and the atmosphere, and the exploration of mechanisms with scavengers experiment, electron paramagnetic resonance (EPR) and diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. The challenges and outlook for the further research in this field are also discussed. | Zewen Shen Yezi Hu Bingfeng Li Yingtong Zou Shaojun Li GWilma Busser Xiangke Wang Guixia Zhao Martin Muhler | 2021 | Journal of Energy Chemistry2021，30，11： | 1 |
| 9 | CO oxidation over supported gold catalysts-''inert'' and ''active'' support materials and their role for the oxygen supply during reaction 显示文摘 | Markus M Schubert Stefan Hackenberg Andre C van Veen Martin Muhler | 2001 | Journal of Catalysis2001，197，： | 1 |
| 10 | A novel morphology of vapor grown carbon microfibers:Connected hollow microcones显示文摘 | Wei Xia Oliver F K Schl uter Martin Muhler | 2004 | Carbon2004，42，1213： | 1 |
| 11 | Highly dispersed Pd clusters/nanoparticles encapsulated in MOFs via in situ auto-reduction method for aqueous phenol hydrogenation显示文摘In this work,a novel in situ auto-reduction strategy was developed to encapsulate uniformly dispersed Pd clusters/nanoparticles in MIL-125-NH_(2).It is demonstrated that the amino groups in MIL-125-NH_(2)can react with formaldehyde to form novel reducing groups(-NH-CH_(2)OH),which can in situ auto-reduce the encapsulated Pd^(2+)ions to metallic Pd clusters/nanoparticles.As no additional reductants are required,the strategy limits the aggregation and migration of Pd clusters and the formation of large Pd nanoparticles via controlling the amount of Pd^(2+)precursor.When applied as catalysts in the hydrogenation of phenol in the aqueous phase,the obtained Pd(1.5)/MIL-125-NH-CH_(2)OH catalyst with highly dispersed Pd clusters/nanoparticles with the size of around 2 nm exhibited 100%of phenol conversion and 100%of cyclohexanone selectivity at 70℃ after 5 h,as well as remarkable reusability for at least five cycles due to the large MOF surface area,the highly dispersed Pd clusters/nanoparticles and their excellent stability within the MIL-125-NH-CH_(2)OH framework. | Xiubing Huang Xiaoyu Li Wei Xia Bin Hu Martin Muhler Baoxiang Peng | 2022 | Journal of Materials Science & Technology2022，，14： | 1 |
| 12 | PtRu nanoparticles supported on nitrogen-doped multiwalled carbon nanotubes as catalyst for methanol electrooxidation显示文摘 | Raghuram Chetty Shankhamala Kundu Wei Xia Michael Bron Wolfgang Schuhmann Valentin Chirila Waltraut Brandl Thomas Reinecke Martin Muhler | 2009 | Electrochimica Acta2009，，17： | 1 |
| 13 | Ammonia‐Annealed TiO<sub>2</sub> as a Negative Electrode Material in Li‐Ion Batteries: N Doping or Oxygen Deficiency?显示文摘 | Edgar Ventosa Wei Xia Stefan Klink Fabio La Mantia Bastian Mei Martin Muhler Wolfgang Schuhmann | 2013 | Chem Eur J2013，，42： | 1 |
| 14 | The Role of Oxygen‐ and Nitrogen‐containing Surface Groups on the Sintering of Iron Nanoparticles on Carbon Nanotubes in Different Atmospheres显示文摘 | Miguel D. Sánchez Peirong Chen Thomas Reinecke Martin Muhler Wei Xia | 2012 | ChemCatChem2012，，12： | 1 |
| 15 | On the role of the residual iron growth catalyst in the gasification of multi-walled carbon nanotubes with carbon dioxide显示文摘 | Chen Jin Wei Xia Peirong Chen Martin Muhler | 2012 | Catalysis Today2012，，1： | 1 |
| 16 | Creation of surface defects on carbon nanofibers by steam treatment显示文摘A direct strategy for the creation of defects on carbon nanofibers (CNFs) has been developed by steam treatment.Nitrogen physisorption,XRD,Raman spectra,SEM and TEM analyses proved the existence of the new defects on CNFs.BET surface area of CNFs after steam treatment was enhanced from 20 to 378 m2/g.Pd catalysts supported on CNFs were also prepared by colloidal deposition method.The different activity of Pd/CNFs catalysts in the partial hydrogenation of phenylacetylene further demonstrated the diverse surfaces of CNFs could be formed by steam treatment. | Zhengfeng Shao Min Pang Wei Xia Martin Muhler Changhai Liang | 2013 | Journal of Energy Chemistry2013，22，5： | 1 |
| 17 | 水滑石基钴铜催化剂中钴的碳化在高碳醇合成中的作用显示文摘Co-Cu基催化剂广泛用于合成气制高碳醇反应(HAS)中.尽管很难从本质上完全理解催化剂的活性位,但是在HAS条件下生成的Co2C对反应的贡献是显而易见的.开发了CO预处理工艺,系统地研究了钴的碳化对催化剂结构性能和催化性能的影响.通过在HAS反应之前将催化剂暴露在含CO的气氛中,催化剂表面发生Co的富集,然后形成碳化物.这种表面改性减少了烃类的形成,促进了C2+OH的形成.催化剂经20 bar下CO预处理后,乙醇选择性最高,烃类选择性最低. | Janine Nebel Stefan Schmidt Qiushi Pan Katrin Lotz Stefan Kaluza Martin Muhler | 2019 | Chinese Journal of Catalysis2019，40，11： | 1 |
| 18 | Photocatalytic one-step synthesis of Ag nanoparticles without reducing agent and their catalytic redox performance supported on carbon显示文摘Synthesis of silver nanoparticles(Ag NPs) with state-of-the-art chemical or photo-reduction methods generally takes several steps and requires both reducing agents and stabilizers to obtain NPs with narrow size distribution.Herein, we report a novel method to synthesize Ag NPs rapidly in one step, achieving typical particle sizes in the range from 5 to 15 nm.The synthesis steps only involve three chemicals without any reducing agent: AgNO3 as precursor, polyvinylpyrrolidone(PVP) as stabilizer, and AgCl as photocatalyst.The Ag NPs were supported on carbon and showed excellent performance in thermal catalytic pnitrophenol reduction and nitrobenzene hydrogenation, and as electrocatalyst for the oxygen reduction reaction. | Lingling Shui Guoxiu Zhang Bin Hu Xingxing Chen Mingliang Jin Guofu Zhou Nan Li Martin Muhler Baoxiang Peng | 2019 | Journal of Energy Chemistry2019，28，9： | 0 |
| 19 | A reevaluation of the correlation between the synthesis parameters and structure and properties of nitrogen-doped carbon nanotubes显示文摘Nitrogen-doped carbon nanotubes(NCNTs) were synthesized by chemical vapor deposition using cobaltbased oxides as catalyst and ethylenediamine(EDA) as carbon/nitrogen precursor. The influence of growth time,EDA concentration and growth temperature on the morphology,yield,composition,graphitization and oxidation resistance of the NCNTs was systematically investigated by using Raman spectroscopy,temperature-programmed oxidation and other techniques. The NCNT growth from ethylenediamine with a high N/C ratio involves several processes including mainly(1) catalytic growth of NCNTs,(2) homogeneous gas-phase decomposition of EDA,(3) non-catalytic deposition of pyrolytic carbon/nitrogen species and(4)surface etching of amorphous carbon or carbon at defect sites through gasification. At a later growth stage the etching process appears to be dominating,leading to the thinning of nanotubes and the decrease of yield.Moreover,the surface etching through carbon gasification strongly influences the structure and degree of graphitization of NCNTs. | Kunpeng Xie Fengkai Yang Petra Ebbinghaus Andreas Erbe Martin Muhler Wei Xia | 2015 | Journal of Energy Chemistry2015，24，4： | 0 |
| 20 | Promoting effect of nitrogen doping on carbon nanotube-supported RuO2 applied in the electrocatalytic oxygen evolution reaction显示文摘RuO_2 nanoparticles supported on multi-walled carbon nanotubes(CNTs) functionalized with oxygen(OCNTs) and nitrogen(NCNTs) were employed for the oxygen evolution reaction(OER) in 0.1 M KOH.The catalysts were synthesized by metal-organic chemical vapor deposition using ruthenium carbonyl(Ru_3(CO)_(12)) as Ru precursor. The obtained RuO_2/OCNT and RuO_2/NCNT composites were characterized using TEM, H_2-TPR, XRD and XPS in order probe structure–activity correlations, particularly, the effect of the different surface functional groups on the electrochemical OER performance. The electrocatalytic activity and stability of the catalysts with mean RuO_2 particle sizes of 13–14 nm was evaluated by linear sweep voltammetry, cyclic voltammetry, and chronopotentiometry, showing that the generation of nitrogen-containing functional groups on CNTs was beneficial for both OER activity and stability. In the presence of RuO_2, carbon corrosion was found to be significantly less severe. | Kunpeng Xie Wei Xia Justus Masa Fengkai Yang Philipp Weide Wolfgang Schuhmann Martin Muhler | 2016 | Journal of Energy Chemistry2016，25，2： | 0 |
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