激光促进乙烯在硫酸镍上表面反应

制备了硫酸镍固体材料.采用红外光谱(IR)、程序升温脱附(TPD)和激光促进表面反应(LSSR)技术，研究了乙烯在NiSO4表面上的化学吸附态和激光促进C2H4表面反应性能.实验结果表明,C2H4以H原子与固体材料表面Lewis碱位(S=O键中的端氧)作用，形成分子吸附态.在常压和100 ℃条件下，用1079 cm－1激光激发吸附有C2H4分子中H的S=O键100次， C2H4转化率可达15％，生成丁二烯的选择性为100％.根据表征和反应结果，讨论了C2H4在NiSO4上的LSSR机理和影响LSSR性能的因素.

Laser Stimulated Surface Reaction of C_2H_4 on Nickel Sulfate

Solid material NiSO4 was prepared. A TEA CO2 laser generator was adopted as the light source to carry on laser stimulated surface coupling reaction of ethylene. The infrared vibration structure and adsorption state of C2H4ad NiSO4 system were discussed based on infrared and temperature programmed desorption tests. It was showed that C2H4 is adsorbed as molecular state, bonding with NiSO4 surface through H atom at terminal O of S=O. The 1 079 cm－1 laser was selected to activate solid surfacial bond S=O, which absorbs the photon energy efficiently. At normal pressure and a temperature below 100 ℃, C2H4 conversed to butadiene with a high selectivity of 100％. Increasing laser pulse can improve conversion of C2H4 without change of selectivity. After 200 pulses, C2H4 in the system had been consumed to a large extent, and the product occupied most of the surface active sites, therefore conversion of C2H4 increased at a low speed. Temperature can also affect the laser stimulated surface reaction of C2H4ad NiSO4. At 100 ℃, 15.1％ of C2H4 convert to butadiene, while keeping high selectivity of 100％. Based on the above experimental results, a mechanism of LSSR was proposed for the conversion of C2H4 to C4H6.