权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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

基本信息

批准号：
01550632
负责人：
ANPO Masakazu
金额：
$ 1.47万
依托单位：
University of Osaka Prefecture
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

Anchoring of VOC1_3 onto porous Vycor glass and silica was performed using a facile reaction of photoactivated VOC1_3 with surface OH groups of the dehydrated Vycor glass and silica at 273 K. Photoactivation of adsorbed VOC1_3 molecules was carried out by a N_2 laser excitation of VOC1_3 (Photo-CVD). The number of anchored VOC1_3 and reacted surface OH groups was monitored by UV and IR spectroscopy. Anchored samples were evacuated, hydrolyzed with H_2O, and finally calcined in O_2. It was found that photochemically anchored vanadium species were transferred to tetrahedrally coordinated ultra-thin-film anchored vanadium oxide.Ultra-thin-film anchored vanadium oxide catalysts exhibited much higher reactivities for the various photocatalytic reactions than those of the vanadium oxides prepared by conventional impregnation method. UV irradiation of ultra-thin-film anchored vanadium oxide in the presence of trans-2-butene led to the photocatalytic isomerization, the formation of cis-2-butene and 1-butene. It was first found that UV irradiation of ultra-thin-film anchored vanadium oxide at 275 K in the presence of NO led to the direct decomposition of NO into N_2 and O_2. It was also found that UV irradiation of ultra-thin-film anchored vanadium oxide in the presence of a mixture of NO and CH_4 led to the oxidative coupling reaction of CH_4, resulting in the formation of C_2H_6, C_2H_4, and CH_3OH.Thus, the present research project not only provided useful information on the advantage of the laser-excitation processes to prepare the ultra-thin-film anchored vanadium oxide but also showed the high photocatalytic activities of the photo-chemically prepared ultra-thin anchored vanadium oxide forvarious reactions at normal temperature.

在 273 K 下，利用光活化 VOC1_3 与脱水 Vycor 玻璃和二氧化硅表面 OH 基团的轻松反应，将 VOC1_3 锚定到多孔 Vycor 玻璃和二氧化硅上。通过 N_2 激光激发 VOC1_3 (Photo-CVD) 来实现吸附的 VOC1_3 分子的光活化。通过紫外和红外光谱监测锚定的VOC1_3和反应的表面OH基团的数量。将锚定样品抽真空，用H_2O水解，最后在O_2中煅烧。研究发现，光化学锚定的钒物质转移到四面体配位的超薄膜锚定氧化钒上。超薄膜锚定氧化钒催化剂对各种光催化反应表现出比传统浸渍法制备的氧化钒更高的反应活性。在反式2-丁烯存在下，超薄膜锚定氧化钒的紫外线照射导致光催化异构化，形成顺式2-丁烯和1-丁烯。首次发现，在NO存在的情况下，超薄膜锚定氧化钒在275 K紫外光照射下，NO直接分解为N_2和O_2。研究还发现，在NO和CH_4的混合物存在下，紫外照射超薄膜锚定氧化钒会导致CH_4发生氧化偶联反应，从而形成C_2H_6、C_2H_4和CH_3OH。因此，本研究项目不仅提供了关于激光激发工艺制备氧化钒的优势的有用信息。超薄膜锚定氧化钒还显示出光化学制备的超薄锚定氧化钒在常温下对各种反应具有高光催化活性。