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.

使用光活化的VOC1_3的轻松反应与273 K的脱水Vycor玻璃和二氧化硅的表面OH基团固定在多孔Vycor玻璃和二氧化硅上。 -cvd）。通过紫外线和红外光谱法监测锚定的VOC1_3和反应表面OH组的数量。将锚定样品疏散，用H_2O水解，最后在O_2中钙化。发现将光化学锚定的钒物种转移到四面体配位的超薄薄膜锚定氧化钒。粉状薄膜锚定的氧化钒氧化物催化剂表现出比通过常规化的氧化物氧化物的反应表现出更高的活力。方法。在反式2二二苯存在的情况下，超薄膜锚定氧化钒的紫外线辐照导致光催化异构化，形成CIS-2-丁烯和1-二丁烯。首先发现，在NO存在的情况下，超薄膜锚定在275 K处的紫外线辐照导致NO直接分解为N_2和O_2。还发现，在没有NO和CH_4的混合物的情况下，超薄膜锚定氧化钒的紫外线辐照导致CH_4的氧化偶联反应，从而形成C_2H_6，C_2H_4和CH_3OH.THUS，THES，THE，CO_2H_6，C_2H_4和CH_3OH.目前的研究项目不仅提供了有关激光激发过程优势的有用信息正常温度。