CAJ | 학술논문

在固定床微反应器上利用全产物在线分析方法,研究了钴基催化剂上伯醇CnH2n+1OH (n=2,3,5,6)在惰性气氛(Ar)和氢气气氛下的反应行为以及添加CnH2n+1OH对费托(FT)合成反应的影响,并结合原位漫反射傅里叶变换红外光谱(DRIFTS)表征.结果表明:碳数为n的醇在Ar气氛和H2气氛下反应主要有脱羰和脱水两条反应路径,分别生成碳数为n-1的烃和相同碳数的烃.低碳数醇(乙醇和正丙醇)的添加对费托合成产物分布无明显影响;而较高碳数的醇(正戊醇和正己醇)的加入使碳数为n-1以上烃的选择性显著增加,这是由于CnH2n+1OH加入后生成碳数为n-1和n的中间体可进一步发生链引发反应,生成更多的长链烃.
재고정상미반응기상이용전산물재선분석방법,연구료고기최화제상백순CnH2n+1OH (n=2,3,5,6)재타성기분(Ar)화경기기분하적반응행위이급첨가CnH2n+1OH대비탁(FT)합성반응적영향,병결합원위만반사부리협변환홍외광보(DRIFTS)표정.결과표명:탄수위n적순재Ar기분화H2기분하반응주요유탈탄화탈수량조반응로경,분별생성탄수위n-1적경화상동탄수적경.저탄수순(을순화정병순)적첨가대비탁합성산물분포무명현영향;이교고탄수적순(정무순화정기순)적가입사탄수위n-1이상경적선택성현저증가,저시유우CnH2n+1OH가입후생성탄수위n-1화n적중간체가진일보발생련인발반응,생성경다적장련경.
CnH2n+1OH (n=2, 3, 5, 6) primary alcohol activation, hydrogenation and its additional effects on the performance of the Fischer-Tropsch (FT) synthesis over a cobalt catalyst were investigated in a fixed bed micro-reactor. Al products were analyzed using an on-line gas chromatography. The diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) was used to investigate intermediates on the catalyst surface. In the presence of argon or hydrogen, CnH2n+1OH underwent two main reactions:direct de-carbonylation to produce (CH2)n-1 hydrocarbons, and dehydration to produce (CH2)n hydrocarbons. The addition of lower carbon number alcohol (ethanol or 1-propanol) into the FT synthesis reaction had no significant effect on the hydrocarbon product distribution. While co-feeding higher carbon number alcohol (1-pentanol or 1-hexanol) into the FT synthesis reaction, the selectivity to hydrocarbons with carbon numbers greater than or equal to n-1 increased markedly because of the additive?s chain initiation on the catalyst surface.