摘要
用沉淀法制备了磷酸铁固体材料 .并用红外光谱、程序升温脱附和激光促进表面反应技术 ,研究了乙烯在 Fe PO4表面上的化学吸附态和激光促进 C2 H4表面反应性能 .实验结果表明 ,C2 H4以 H原子与固体材料表面 Lewis碱位 ( P O 键中的端氧 )作用 ,形成分子吸附态 .在常压和 1 0 0℃条件下 ,用 1 0 79cm- 1 激光激发吸附有 C2 H4分子中 H的 P O键 1 0 0次 ,C2 H4转化率可达 1 8% ,生成丁二烯的选择性为 1 0 0 % .根据表征和反应结果 ,讨论了 C2 H4在 Fe PO4上的 LSSR机理和影响 LSSR性能的因素 .
Solid FePO 4 was prepared by precipitation method. A TEA-CO 2 laser generator was adopted as light source to carry out laser stimulated surface reaction(LSSR) of ethylene. The vibration structure and adsorption state of C 2H 4ad -FePO 4 system were discussed based on the infrared and temperature programmed desorption results. It is showed that C 2H 4 is adsorbed in a molecular state by H atom bonding with terminal O of PO in FePO 4 surface. 1 079 cm -1 laser was selected to activate solid surfacial bond PO, which absorbs the photon energy efficiently. At atmospheric pressure and <100 ℃, after 100 laser pulses C 2H 4 conversed to butadiene with 100% selectivity. Increasing laser pulse can improve conversion of C 2H 4 without change of selectivity. After 200 pulses, C 2H 4 in the system was consumed in a high level and the product occupied most active sites on the surface, impeding further conversion of C 2H 4. A mechanism of LSSR has been proposed for the conversion of ethylene to butadiene.
出处
《应用化学》
CAS
CSCD
北大核心
2002年第1期15-17,共3页
Chinese Journal of Applied Chemistry
基金
教育部博士点基金资助项目 ( 19990 0 5 6 0 3)
