Stabilization of photoelectrochemically highly reactive anatase structures with defect-rich surfaces

表面缺陷丰富的光电化学高活性锐钛矿结构的稳定化

• 批准号: 243900894
• 负责人: Professor Dr.-Ing. Joachim Deubener
• 金额: --
• 依托单位: Institut für Nichtmetallische Werkstoffe
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/243900894?language=en
• 关键词: Stabilization; photoelectrochemically; highly; reactive; anatase

The anatase-to-rutile transformation is accompanied with defect-rich oxygen-deficient TiO2-x surfaces, which nevertheless exhibit high reactivity. Thus, preliminary studies showed that using controlled synthesis and identifying homologous sequences of titania nano-particles, the photoelectrochemical efficiency of polydis-perse pyrogenic TiO2 materials is directly controlled by a specific anatase particle fraction, which have the characteristics of being closest to the anatase-to-rutile transformation. Due to their poor thermal stability the fraction of these highly reactive anatase stuctures is very small. Therefore, the research project is focused on the study of the fundamental mechanisms contributing to the formation and stabilization of the highly reactive anatase fraction in the gas-aerosol flow. This includes a knowledge-based synthesis of the nano-materials, in which particle structures will be varied systematically by quenching, i.e. freezing-in their structure. With respect to process engineering this project aims in clarifying the relationships between the conditions of particle growth in the flame and the evolution of the highly-active anatase fraction of polycrystalline pyrogenic photocatalysts. In view of material science it is plant to use the fractional analysis of polydisperse TiO2-powders as well as a variation of photocatalytic process parameters in order to study the kinetics of the oxidation reaction as an equivalent to the photochemical processes at the surface with respect to adsorption and consumption of oxygen, i.e. tracking the concentration of oxygen vacancies as function of the particle size and its location on the anatase-rutile diagram. The interrelation of defect structures and phpotocatalytic performance will be achieved by bringing together the expertise of the applicants in the fields of process technology and materials science as well as by combining complementary experimental and analytic metoods. In particular, cross-disciplinary knowledge transfer and feedback of interim results will be used to adopt the modular structured working program.

锐钛矿到金红石的转变伴随着富缺陷的缺氧TiO 2-x表面，但表现出高的反应性。因此，初步研究表明，通过控制二氧化钛纳米颗粒的合成和确定其同源序列，多分散热解TiO 2材料的光电化学效率直接受特定的锐钛矿颗粒分数控制，其具有最接近锐钛矿-金红石转变的特征。由于它们的热稳定性差，这些高反应性结构的分数非常小。因此，该研究项目的重点是研究的基本机制，有助于形成和稳定的高反应性的H2S馏分的气体-气溶胶流。这包括纳米材料的基于知识的合成，其中颗粒结构将通过淬火系统地变化，即在其结构中冻结。关于过程工程，本项目旨在阐明火焰中颗粒生长条件与多晶热解光催化剂高活性组分演化之间的关系。从材料科学的角度来看，可以使用多分散TiO 2粉末的分级分析以及光催化工艺参数的变化来研究氧化反应的动力学，作为表面上关于氧的吸附和消耗的光化学过程的等效物，即跟踪氧空位的浓度作为粒度的函数及其在锐钛矿-金红石图上的位置。缺陷结构和光催化性能的相互关系将通过汇集工艺技术和材料科学领域的申请人的专业知识以及通过结合互补的实验和分析方法来实现。特别是，将利用跨学科知识转让和中期成果反馈来采用模块化结构工作方案。

项目成果

Elimination of persistent emerging micropollutants in a suspended-bed photocatalytic reactor: influence of operating conditions and combination with aerobic biological treatment

• DOI: 10.1039/c6pp00319b
• 发表时间: 2016-11
• 期刊: Photochemical & Photobiological Sciences
• 影响因子: 3.1
• 作者: N. Pronina;D. Klauson;T. Rudenko;K. Künnis-Beres;I. Kamenev;S. Kamenev;A. Moiseev;Joachim Deubener;M. Krichevskaya

Titanium dioxide sol–gel-coated expanded clay granules for use in photocatalytic fluidized-bed reactor

• DOI: 10.1016/j.apcatb.2014.10.006
• 发表时间: 2015-11
• 期刊: Applied Catalysis B-environmental
• 影响因子: 22.1
• 作者: N. Pronina;D. Klauson;A. Moiseev;J. Deubener;M. Krichevskaya

Gas-phase photocatalytic oxidation of refractory VOCs mixtures: Through the net of process limitations

难熔 VOC 混合物的气相光催化氧化：突破工艺限制

• DOI: 10.1016/j.cattod.2016.03.041
• 发表时间: 2017
• 期刊: Catalysis Today
• 影响因子: 5.3
• 作者: Krichevskaya;Moiseev;Pronina;Deubener
• 通讯作者: Deubener