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超临界水流化床多相催化颗粒制备

发表时间:2016-09-30  浏览量:1220  下载量:280
全部作者: 赵 骁,金 辉,吴振群
作者单位: 西安交通大学动力工程多相流国家重点实验室
摘 要: 我国具有丰富的生物质资源,直接燃烧为主的利用形式不仅利用效率低且造成严重的污染。生物质解聚产物超临界水流化床催化制氢是一种高效清洁的能源转化形式,近年来成为研究的焦点,超临界水流化床加强了传质传热,这其中合适催化剂的制备更是关键要素。本文针对传统催化剂制备方法的局限,采用超临界水热制备方法,利用水热稳定性好的TiO2作为催化剂载体,筛选了Ni、Co、Zn、Cu作为活性组分,制备了纳米级催化剂颗粒。通过气相色谱/质谱(gas chromatographic/mass spectrometry,GC/MS)、扫描电子显微镜(scanning electron microscope,SEM)、能谱仪(energy dispersive spectrometer,EDS)、X射线衍射(X-ray diffraction,XRD)等多种手段对气化反应始末态进行表征,结果表明,制备的金属催化剂具有均匀的球形结构,其粒径在30 nm左右。Ni金属催化剂具有最优秀的稳定性,超临界水热方法制备的金属催化剂具有良好的催化效果。
关 键 词: 生物能源;超临界水流化床;超临界水热;非均相催化剂;纳米颗粒
Title: Multi-phase catalytic particles preparation for supercritical water fludized bed
Author: ZHAO Xiao, JIN Hui, WU Zhenqun
Organization: State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University
Abstract: There is numerous biomass in China, which is usually for direct combustion leading to low energy efficiency and severe pollution. As a high-efficiency conversion method, biomass for catalytic hydrogen production in supercritical fluidized bed has been a hot research for several years. Supercritical water fluidized bed enhances the heat and mass transfer. Meanwhile, a proper catalyst is essential. In this paper, we used supercritical hydrothermal method to break limits of conventional catalyst synthesis method. Ni, Co, Zn and Cu metal elements are loaded on TiO2 particles which are proven to be steady in supercritical water. And nano particles are successfully made. Based on gas chromatographic/mass spectrometry (GC/MS), scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD) analysis methods, it turns out that metal catalysts have a uniform spherical structure with diameter around 30 nm. Ni catalyst shows the best stability. Metal catalysts synthesized with supercritical hydrothermal method shows outstanding catalytic effects.
Key words: bioenergy; supercritical water fludized bed; supercritical hydrothermal; heterogeneous catalyst; nano particles
发表期数: 2016年9月第18期
引用格式: 赵 骁,金 辉,吴振群. 超临界水流化床多相催化颗粒制备[J]. 中国科技论文在线精品论文,2016,9(18):1886-1892.
 
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