CAJ | 학술논문

用共沉淀法制备了5％Li3PO4·BiPO4固体材料.运用XRD、IR、TPD和LSSR技术研究了其晶体结构、表面构造、化学吸附特性和激光促进异丁烷选择氧化表面反应性能.结果表明,复合盐的主体晶相为简单单斜晶型的BiPO4，Li3PO4以分子分散态掺杂主体相中；其表面存在Lewis碱位P=O和P－O－Bi键中的O2－及Lewis酸位Bi3＋和Li＋；异丁烷的两个甲基中的H分别吸附在两个相邻的Lewis碱位P=O上，形成双位分子吸附态；在常压和200℃下，用一定频率的激光激发P=O键1000次，异丁烷的转化率为11.3％，甲基丙烯酸的选择性为72％.根据实验结果，探讨了激光促进异丁烷选择氧化为MAA的表面反应机理.
용공침정법제비료5％Li3PO4·BiPO4고체재료.운용XRD、IR、TPD화LSSR기술연구료기정체결구、표면구조、화학흡부특성화격광촉진이정완선택양화표면반응성능.결과표명,복합염적주체정상위간단단사정형적BiPO4，Li3PO4이분자분산태참잡주체상중；기표면존재Lewis감위P=O화P－O－Bi건중적O2－급Lewis산위Bi3＋화Li＋；이정완적량개갑기중적H분별흡부재량개상린적Lewis감위P=O상，형성쌍위분자흡부태；재상압화200℃하，용일정빈솔적격광격발P=O건1000차，이정완적전화솔위11.3％，갑기병희산적선택성위72％.근거실험결과，탐토료격광촉진이정완선택양화위MAA적표면반응궤리.
The mixed phosphate Li3PO4· BiPO4 was prepared from coprecipitation method. The crystal structure,chemisorption properties and LSSR behaviors of this material have been investigated by the techniques of XRD,IR,TPD and LSSR. The main phase is monoclinic BiPO4 and Li3PO4 dispersed in molecular state in the BiPO4. There are the Lewis basic sites O2－ in the P=O or P－ O－ Bi bonds and Lewis acid site Bi3＋ or Li＋ appeared on the surface of mixed phosphate. Two methyl hydrogen in isobutane molecule can be chemisorbed on the terminal oxygen of neighboring P=O bonds on the surface of mixed phosphate. Under the conditions of 0.1 MPa and 200℃ with the 1050 cm－ 1 laser photons excited the P=O bonds 1000 times,the conversion of isobutane is about 11.3％ with the selectivity of the product MAA over 72％ . Based on the experiment results ,a mechanism of LSSR has been proposed for the isobutane selective oxidation to MAA.