【摘 要】
：
Alumina,silica and titania thin films are deposited inside the channels of stainless steel tubular reactors by atomic layer deposition(ALD)to suppress the metal catalyzed coke formation during thermal
【机 构】
：
Xi'an Modern Chemistry Research Institute,Xi'an,Shaanxi 710065
论文部分内容阅读
Alumina,silica and titania thin films are deposited inside the channels of stainless steel tubular reactors by atomic layer deposition(ALD)to suppress the metal catalyzed coke formation during thermal cracking of hydrocarbon fuels.The metal tubes are incorporated into the flow path of the customized ALD system so that reaction precursors are forced to flow through the internal cavity of the micro reactor.Experimental parameters are adjusted to ensure complete and uniform coverage of the internal surfaces of the metal tubes.Quartz crystal microbalance measurements reveal that the average film growth rate is 0.15nm/cycle for silica,0.12nm/cycle and 0.24nm/cycle for titania.The thicknesses of the passivation layers are precisely controlled by adjusting the number of ALD cycles.In coking experiments very thin films of alumina,silica and titania only show modest anti-coking performances and thicker coatings can effectively enhance the run lengths of the micro channel reactors.Generally ALD titainia and alumina coatings perform better than silica coatings.The lifetime of the experimental system passivated by ALD alumina or titania films can be up to 5 times longer than that of the system using bare metal tubes as the reactor.When the tested metal tube samples are analyzed,it is discovered that the ALD alumina and titania film remains intact after the coking experiment,indicating that the metal-catalyzed filament coke formation can be completely inhibited by the ALD alumina passivation layer[1].
其他文献
三氧化钨具有良好的电致变色性能.本文用溶胶凝胶法制备氧化钨薄膜，以偏钨酸铵，聚乙二醇400 和去离子水配置成前驱体溶液，旋涂成膜，分别在不同温度下进行热处理.为了提高薄膜质量，添加了少量聚乙烯吡咯烷酮(PVP)，并在500℃下热处理成膜.X射线衍射(XRD)结果表明，热处理温度的变化会导致薄膜的晶体结构的变化：300℃和350℃热处理制备的氧化钨处于非晶态；400℃和450℃热处理制备的氧化钨薄膜
A NiO/RGO hybrid film is prepared by a sol-gel method [1].The microstructures of the hybrid films were characterized by X-ray diffraction and scanning electron microscopy.The results show that NiO/RGO
中国电子科技集团公司第十八研究所研制了批生产平均效率达到30.6％的高效GaInP/GaInAs/Ge三结太阳电池(AM0,25oC,136.7 mW/cm2),最高光电转换效率超过31％.经1MeV,累积通量1e15 cm-2 电子辐照后,功率衰降16％,本文同时给出了其它性能测试结果,环境模拟试验后,电性能衰降小于2％.
采用120 V 电压,在含0.4 M F-电解液中阳极氧化Ti 片制备了高度有序且结构紧凑的TiO2 纳米管阵列.与传统阳极氧化工艺(60 V,0.27 M F-)相比[1-3],不仅制备时间从数小时缩短到数十秒,而且所得到的TiO2 纳米管阵列与Ti 基底结合紧密,光电转化性能也有明显提高.在传统的连续离子层吸附反应法(SILAR)基础上,采用超声协助的U-SILAR 方法在TiO2 纳米管阵列
采用以偏钨酸铵作为前驱体的溶液法制备WO3电致变色薄膜,并利用XRD,SEM,AFM 和TEM 等技术表征了薄膜的微结构.薄膜在400oC 热处理时从无定型态转变为三斜晶系,薄膜表面平整,厚度为42 nm 左右.实验对比了非晶态和结晶态WO3 薄膜在不同H+离子注入量时的透射光谱和椭圆偏振光谱,并采用双层模型对椭偏光谱实现了较好拟合.研究结果表明,WO3 薄膜表现出较好的电致变色性能,可见光平均透
Unassisted overall water splitting via photoelectrochemical(PEC)light harvesting system as a promising approach has been developed for hydrogen fuel production.However,very few p-type semiconductor ph
长期运行的空间站，因空间环境或其他因素可能出现的密封舱体泄漏，将威胁航天员的生命安全、缩短空间站寿命。但通过有效的在轨检漏技术，快速地确定泄漏位置，并进行堵漏和修复，就可消除空间站泄漏隐患。本文介绍了空间站在轨检漏总体技术、压力变化“判”漏技术、超声便携航天员舱内大漏“定”漏技术、声传感器“实时定”位技术，分析了空间站舱内环境对检漏技术影响因素，提出了切实可行且已攻克技术关键的在空间站在轨检漏技术
采用飞秒激光在GCr15 基体表面进行不同微结构加工，并在其表面采用电弧沉积方式制备DLC 薄膜，比较并研究了不同微结构对DLC 薄膜的结构及性能影响，通过扫描电镜对薄膜厚度及形貌进行测试，采用EDS 测试薄膜成份，采用XRD 测试薄膜结构，力学性能通过纳米压痕、划痕试验进行测试，摩擦磨损性能采用srv 摩擦磨损实验仪及形貌测试仪进行分析。结果 表明薄膜力学性能及耐磨性能均与不同的微结构形状及分布
TiN 薄膜是一种广泛应用的减摩抗磨防护涂层,将其与优化的润滑技术结合可显著改善涂覆TiN 摩擦副的摩擦磨损性能[1].目前的润滑技术优化主要是基于钢铁材料摩擦副进行研发[2],而对TiN 薄膜在二烷基二硫代氨基甲酸钼(MoDTC)边界润滑条件下摩擦磨损性能的研究还鲜见报道.本工作利用往复式球-盘摩擦磨损试验机测试了阴极电弧离子镀制备的TiN薄膜在不同边界润滑条件下的摩擦磨损性能,润滑油基础油为聚
本文利用微波等离子体化学气相沉积(MPCVD)方法制备了自支撑金刚石膜,利用高温氧化方法,对金刚石膜进行处理,获得了具有特殊表面结构的金刚石膜,并深入研究了其浸润性,以拓展其新应用。研究表明(100)织构自支撑金刚石膜的生长面(接触角,87°)和成核面(接触角,70°)为亲水性,高温氧化处理后的金刚石膜生长面亲水性略有增大(接触角,78-80°),而成核面表现出超亲水性(接触角,0-18°)。进一