碳纳米管在催化载体中的应用

综述了近几年来碳纳米管用作催化剂载体的研究进展;评述了以碳纳米管为载体的催化剂其反应活性、选择性、稳定性等均较常规载体负载的催化剂效果好。     

墨西哥制成新型双层碳纳米管

日本爱知产业最近开发了可焊接铁和铝的MIG焊接系统——“Cold Metal Transfer(CMT，冷金属过渡焊接机)”。主要用于焊接薄铝板和镀锌铁板。不需熔化铁，仅通过熔化表面的锌即可与铝进行焊接。焊接速度为每秒600mm.可支持厚0．3～3mm左右的铝板。价格起价为520万日元(约合人民币40万元)。     

碳纳米管在催化中的应用进展

简要介绍了碳纳米管的基本结构、特点以及制备方法,概述了碳纳米管在国内用作催化剂或催化剂载体的应用进展情况。     

碳纳米管的纯化

介绍了碳纳米管的结构特征和种类,并详尽论述了近年来碳纳米管的提纯方法和条件,并对各种方法进行比较和总结。     

负载铁SBA-15分子筛催化热解甲醇制备碳纳米管

采用水热合成法制备了SBA-15,利用液相浸渍法合成负载铁SBA-15介孔分子筛,在常压下用所合成的含铁SBA-15介孔分子筛为催化剂通过CVD法成功制备了碳纳米管。采用X射线粉末衍射、扫描电子显微镜、拉曼光谱等方法对合成的样品进行了表征。且合成的碳纳米管质量好,表面没有无定形碳粒子被发现。     

碳纳米管的研究进展

对碳纳米管的发现和理论认识进行了回顾,介绍了碳纳米管的形状,结构,性能,应用及发处理等相关知识,对碳纳米管研究中存在的问题和发展趋势进行了分析。     

甲烷催化裂解制备氢气和碳纳米管

采用浸渍法制备出3种MgO负载型过渡金属催化剂Fe/MgO、Co/MgO和N i/MgO,系统研究了甲烷在3种催化剂上于650,700和750℃下的裂解产物。结果表明,该3种催化剂均对甲烷裂解产氢并协同生长碳纳米管表现出较高活性。     

碳纳米管材料在食品安全分析中的应用

食品中有害因子的快速高效检测一直是食品安全领域致力解决的重要问题。碳纳米管作为一种新型的纳米碳材料,以其比表面积大、导电性好、吸附性强、易于化学修饰等诸多优良性质在食品安全检测领域得到广泛关注和应用。本文简述了碳纳米管的类型、制备和表征方法,分析了食品中有害因子的种类及其来源,论述了碳纳米管在农药残留、兽药残留、重金属、微生物和毒素、食品添加剂等食品有害因子检测中的应用,并展望了碳纳米管在食品安全分析领域的发展方向。指出将碳纳米管用于食品安全分析极大地促进了食品安全检测方法和技术向高灵敏度、低成本、高效率、快速等方向发展。     

碳纳米管的制备研究

本文介绍了国内外碳纳米管(CNTS)最新研究进展，分析了制备碳纳米管所必需的3个关键条件：碳源、催化剂、能源；并分别研究了它们对碳纳米管生长的影响。通过碳纳米管的生长机理探讨了大规模制备碳纳米管的可行性。     

纳米材料在固体推进剂中的应用进展

从纳米含能材料、纳米金属粉、纳米催化剂及纳米碳材料4个方面综述了纳米材料在固体推进剂中的应用进展,归纳了各类纳米材料的特点及其在固体推进剂应用中存在的问题。指出了未来的研究方向,如纳米材料在固体推进剂中的分散技术、影响纳米材料微观形貌和粒度的因素、纳米材料在固体推进剂中的催化作用机理及利用纳米材料改善固体推进剂的力学性能等。     

Catalytic Routes Towards Single Wall Carbon Nanotubes

Single wall carbon nanotubes (SWCNT) have become a strategic material in the area of nanotechnologies nowadays, and catalytic chemical vapor deposition seems to be the most promising technique in view of an industrial-scale production. However, the selective catalytic production of single wall carbon nanotubes is still a challenge, since catalytic systems performances both in terms of selectivity and activity are still relatively low. One of the main challenges for the catalytic growth of SWCNT is the control of the catalyst nanoparticles size distribution along the high temperatures required by the process. This article provides a comprehensive overview of the state of the art of the strategies that have been followed to selectively grow single wall carbon nanotubes. It focuses on catalysts preparation and activity/selectivity and on the growth mechanism of these nanostructures. Particular attention is given to the identification of the parameters that control the selectivity of the reaction, such as the choice of the metal/support couple, the particle's sizes, and the chemical vapor deposition conditions.     

Catalytic Routes Towards Single Wall Carbon Nanotubes

Single wall carbon nanotubes (SWCNT) have become a strategic material in the area of nanotechnologies nowadays, and catalytic chemical vapor deposition seems to be the most promising technique in view of an industrial‐scale production. However, the selective catalytic production of single wall carbon nanotubes is still a challenge, since catalytic systems performances both in terms of selectivity and activity are still relatively low. One of the main challenges for the catalytic growth of SWCNT is the control of the catalyst nanoparticles size distribution along the high temperatures required by the process. This article provides a comprehensive overview of the state of the art of the strategies that have been followed to selectively grow single wall carbon nanotubes. It focuses on catalysts preparation and activity/selectivity and on the growth mechanism of these nanostructures. Particular attention is given to the identification of the parameters that control the selectivity of the reaction, such as the choice of the metal/support couple, the particle’s sizes, and the chemical vapor deposition conditions.     

催化化学气相沉积法合成单壁纳米碳管的研究进展

介绍了合成单壁纳米碳管的三种主要方法,总结了国内外催化化学气相沉积法合成单壁纳米碳管的研究现状,着重介绍了催化剂对合成单壁纳米碳管影响的研究情况,并分析了反应工艺条件对合成单壁纳米碳管的影响.     

碳纳米管/高聚物复合材料研究进展

介绍了碳纳米管/高聚物复合材料的研究进展,并对碳纳米管/高聚物复合材料研究中的工艺、方法及存在问题进行了论述。     

Co／Mo催化剂制备碳纳米管的研究

以氧化铝凝胶负载Co／Mo合金为催化剂，C2H2为碳源，用CVD法合成了纯度较商的多壁碳纳米管（MWCNT）。通过甩TEM和XRD等方法，对碳纳米管（CNTs）进行了表征，表明制备的碳纳米管具有较高的石墨化程度。研究得出当催化剂的沉淀pH=7．5，H2为还原气和载气，升温速率为50℃／min时，碳纳米管的纯化后的产率高达85％，为下一步的大规模化生产打下了良好构基础。     

Abatement of NO Using Rhodium Catalysts Supported on Carbon Nanotubes: Carbon as Support Material and Reducing Agent

The catalytic abatement of NO over rhodium catalysts supported on carbon nanotubes was studied. In the absence of oxygen, Rh/carbon nanotubes (CNT) catalysts exhibit high activities in the catalytic reduction of NO with the carbon support acting as the reducing agent. The lifetime of the catalysts is limited by the stoichiometric oxidation of the support material.     

多壁碳纳米管氟化改性新方法研究

以聚四氟乙烯（PTFE）高温热解产生的含氟气体作为氟化剂与多壁碳纳米管（MWCNTs）反应制备了氟化多壁碳纳米管（F-MWCNTs）,并运用红外光谱（FTIR）、扫描电镜（SEM）、X-射线衍射（XRD）、接触角测试等手段对其进行了检测。结果显示,多壁碳纳米管表面有C-F键生成,样品结构未遭破坏且疏水性得到改善,取得了较好效果。与以氟气作氟化剂的传统方法相比,该方法操作更简单安全、成本更低,有望应用于工业化生产。     

纳米碳管的研究进展

本文对纳米碳管的结构、种类作了概括介绍；对纳米碳管的制备方法、纯化方法及主要应用作了详细的综述；并对纳米碳管研究中存在的问题及今后发展趋势作了简单介绍。     

羟基磷灰石作为催化材料的研究进展

羟基磷灰石(HAP)由于具有无毒性、生物相容性、热稳定性、吸附性、离子交换性、结构稳定性等,因而被广泛应用到催化剂的制备中.作为一种新型催化材料,HAP的特殊晶体结构对一些反应表现出催化活性,并且经过改性、负载等方法处理过后的HAP催化剂显示出独特的催化优势.基于近年来HAP在催化邻域的发展,综述了HAP作为催化材料在...     

Catalytic Performance of Pt Metal Particles at the Tips of Carbon Nanotubes

Abstract  

The catalytic performance of Pt metal at the tips of carbon nanotubes (CNT@Pt), which was prepared by ethylene decomposition over Pt/MgO, was compared with that of Pt metal on the outer surface of CNT (Pt/CNT). CNT@Pt showed excellent catalytic performance toward the hydrogenation of α, β-unsaturated aldehydes to unsaturated alcohols, which was similar to that of Pt/CNT and resulted from a strong interaction between Pt metal and the CNT.