激光促进丁醇裂解表面反应规律

STUDY OF THE BEHAVIORS OF LASER-STIMULATED N-BUTANAL CRACKING SURFACE REACTION

利用红外光谱、化学吸附和激光表面反应技术研究了丁醇在SiO_2、γ-Al_2O_3和Fe_2O_3上的激光表面反应规律。结果表明:固体表面材料的红外特性及化学吸附能力、激光频率等是影响激光能量利用率的主要因素;丁醇在固体表面上的吸附态及受激吸附态分子内键与键间的能量传递是影响反应产物选择性的主要因素。根据实验结果,探讨了激光促进丁醇裂解反应过程的能量传递规律,提出了激光促进丁醇裂解表面反应机理。

Infrared spectroscopy, chemisorption and pulse CO_2 laser techniques have been used to investigate the title reaction on the surfaces of SiO_2, γ-Al_2O_3 and Fe_2O_3 at room temperature and atmospheric pressure: This study has revealed that the reaction of n-butanol cracking occurred obviously on the surfaces with the help of a peculiar frequency laser excitation, the solid surface bond or the c-o and c-c bond in the adsorbed n-butanol molecules. The products of this reaction are ethane, ethene, acetylene, propylene, 1-butene and 2-butene; the selectivity of ethene in the reaction products is about 37%. The efficiency of laser photon energy depends strongly on the frequency and pulse interval time of the laser, on the infrared characteristics of the solid material and on the adsorbing capability of the reactant molecule. The selectivity of the reaction products depends essentially on the chemisorption state of n-butanol and on the energy transfer from the excited bond to other bonds in the adsorbent n-butanol molecules. A reaction mechanism of laser-stimulated n-butanol cracking and a model of energy transfer and relaxation in such a process are proposed based on the experimental results.