Preparation of Photocatalysts in Micro-pores of Zeolite and Their Reaction Dynamics
沸石微孔光催化剂的制备及其反应动力学
基本信息
- 批准号:05453123
- 负责人:
- 金额:$ 3.97万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (B)
- 财政年份:1993
- 资助国家:日本
- 起止时间:1993 至 1994
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
It is of special interest to design the ion and/or cluster size catalysts within the zeolites because these fascinating supports offer unique nano-scaled pore systems, unusual internal surface tipology, and ion-exchange capacities. The pore structure of the zeolite not only allows for reactant molecules to diffuse into the ppre where in can access the catalyst anchored within the zeolite cavities, but also can remain intact during subsequent ion and/or cluster growth. The modification of the space required for a specific photocatalytic reactions is important. Unique photocatalytic properties which cannot be realized in normal catalytic systems can be expected in modified reaction spaces. Zeolites with well-defined nano-pore structure provide one of the most promising modified spaces for photocatalytic reactions.In the present study, it was found that UV-irradiation of the active titanium oxide catalysts in the presence of CO_2 and H_2O at 275 K led to the photocatalytic reduction of CO … More _2. The characteristic features of the photocatalytic reduction of CO_2 with H_2O on the active titanium oxide catalysts were investigated by in situ photoluminescence, UV-Vis, XAFS,ESR,FT-IR and XPS spectroscopic techniques.The reactions on TiO_2 powders produced methane as the major product, while, on the highly dispersed titanium oxide anchored on a porous glass and zeolites the formation of CH_4, CH_3OH,C_2-compounds and CO was observed as the major products. The yields of the phptpcatalytic reactions strongly depended on the type of catalysts, the values of CO_2/H_2O and the reaction temperatures. In situ spectroscopic studies of the system indicated that the photocatalytic reduction of CO_2 with H_2O is linked to the much higher reactivity of the charge transfer excited state, i.e., (Ti^<3+>-O^-)^<3*> of the tetrahedral coordinated titanium oxides species formed on the surfaces. Based on the detection of reaction intermediate species such as Ti^<3+>, H atoms, and C radicals, reaction mechanism for the photocatalytic reduction of CO_2 with H_2O has been proposed on a molecular scale. Less
在沸石内设计离子和/或簇尺寸的催化剂特别令人感兴趣,因为这些令人着迷的载体提供了独特的纳米级孔隙系统、不寻常的内表面拓扑结构和离子交换能力。沸石的孔结构不仅允许反应物分子扩散到ppre中,其中可以接触固定在沸石腔内的催化剂,而且还可以在随后的离子和/或簇生长期间保持完整。特定光催化反应所需空间的修改很重要。在改进的反应空间中可以期待在普通催化系统中无法实现的独特光催化性能。具有明确纳米孔结构的沸石为光催化反应提供了最有前途的修饰空间之一。在本研究中,发现在275 K下CO_2和H_2O存在下,活性二氧化钛催化剂的紫外线照射导致CO的光催化还原……更多_2。采用原位光致发光、UV-Vis、XAFS、ESR、FT-IR和XPS光谱技术研究了活性二氧化钛催化剂上H_2O光催化还原CO_2的特征。TiO_2粉末上的反应主要产物是甲烷,而在多孔玻璃上锚定的高度分散的二氧化钛上的反应主要产物是甲烷。 观察到沸石的主要产物是CH_4、CH_3OH、C_2-化合物和CO的形成。 phptp催化反应的产率很大程度上取决于催化剂的类型、CO_2/H_2O的值和反应温度。系统的原位光谱研究表明,H_2O对CO_2的光催化还原与电荷转移激发态的更高反应活性有关,即表面形成的四面体配位氧化钛物种的(Ti^<3+>-O^-)^<3*>。基于Ti^3+、H原子和C自由基等反应中间体的检测,提出了分子尺度上H_2O光催化还原CO_2的反应机理。较少的
项目成果
期刊论文数量(134)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
松岡雅也: "銅/ゼオライト触媒とNOおよびCOとの相互作用" 触媒. 36. 76-79 (1994)
Masaya Matsuoka:“铜/沸石催化剂与 NO 和 CO 的相互作用”,催化 36. 76-79 (1994)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
松岡雅也: "銅/ゼオライト触媒上でのNOの吸着と光触媒分解反応" 科学と工業. 68. 184-191 (1994)
Masaya Matsuoka:“铜/沸石催化剂上 NO 的吸附和光催化分解”《科学与工业》68. 184-191 (1994)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Nobuaki NEGISHI: "Characterization of Copper Ion Catalyst Encapsulated in SiO2 Matrices by the Sol-Gel Method and Their Photocatalytic Activity for Decomposition of NO into N2 and O2 at 275K." J.Phys.Chem.97. 5211-5212 (1993)
Nobuaki Negishi:“通过溶胶-凝胶法表征封装在 SiO2 基质中的铜离子催化剂及其在 275K 下将 NO 分解为 N2 和 O2 的光催化活性。”
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Hiroyasu NISHIGUCHI: "Enhancement of the Phosphorescence Yields of Xanthone Included in Alkali Metal Cation-Exchanged Zeolites." J.Photochem.Photobiol.A:Chem.77. 189-193 (1994)
Hiroyasu NISHIGUCHI:“碱金属阳离子交换沸石中包含的氧杂蒽酮磷光产率的提高。”
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Nobuaki NEGISHI: "Photophysical Properties and Photochemical Stability of Rhodamine B Encapusulated in SiO2 and Si-Ti Binary Oxide Matrices by the Sol-Gel Method." Langmuir. in press (1994)
Nobuaki Negishi:“通过溶胶-凝胶法封装在 SiO2 和 Si-Ti 二元氧化物基质中的罗丹明 B 的光物理性质和光化学稳定性。”
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- 影响因子:0
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ANPO Masakazu其他文献
ANPO Masakazu的其他文献
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{{ truncateString('ANPO Masakazu', 18)}}的其他基金
Development of Efficient Water Splitting System Enabling Separate Evolution of H_2 and O_2 from Water Using an Unique Titanium Oxide Thin Film and Solar Light
开发高效水分解系统,利用独特的氧化钛薄膜和太阳光从水中分离出 H_2 和 O_2
- 批准号:
20360366 - 财政年份:2008
- 资助金额:
$ 3.97万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
The Design and Development of Novel Titanium Oxide Photocatalysts Prepared on the Various Plate Materials by an Advanced Ion Engineering Techniques
采用先进离子工程技术在各种板材上制备新型氧化钛光催化剂的设计与开发
- 批准号:
10650816 - 财政年份:1998
- 资助金额:
$ 3.97万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Design and Development of Unique Photocatalytic Systems for the Decomposition of NOx
设计和开发用于分解氮氧化物的独特光催化系统
- 批准号:
10044170 - 财政年份:1998
- 资助金额:
$ 3.97万 - 项目类别:
Grant-in-Aid for Scientific Research (B).
Design and Development of Second-generation TiO2 Photocatalyst Operating under Solar Beam Irradiation for the Decomposition of NOx
太阳光照射下分解氮氧化物的第二代TiO2光催化剂的设计与开发
- 批准号:
09555272 - 财政年份:1997
- 资助金额:
$ 3.97万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Design of Active Photocatalytic System for Removal of NOx
活性光催化脱硝系统设计
- 批准号:
05044110 - 财政年份:1993
- 资助金额:
$ 3.97万 - 项目类别:
Grant-in-Aid for international Scientific Research
Design of Highly Active Photocatalytic System for the Removal of NOx
高活性光催化脱硝系统设计
- 批准号:
02044125 - 财政年份:1990
- 资助金额:
$ 3.97万 - 项目类别:
Grant-in-Aid for international Scientific Research
Preparation of Ultra-Thin-Film Anchored Metal Oxide Catalysts Via Laser Excitation and Their Photocatalytic Activities
激光激发超薄膜锚定金属氧化物催化剂的制备及其光催化活性
- 批准号:
01550632 - 财政年份:1989
- 资助金额:
$ 3.97万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
Preparation of Highly Dispersed Anchored Catalysts by Photochemical Activation of Adsorbed Species and Their Photocatalytic Activities
吸附物质光化学活化制备高分散锚定催化剂及其光催化活性
- 批准号:
62550595 - 财政年份:1987
- 资助金额:
$ 3.97万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
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