高校化学工程学报2016，Vol.30Issue(6)：1372-1379,8.DOI:10.3969/j.issn.1003-9015.2016.06.020
La对CHF3和I2气相合成CF3I催化剂性能的影响
Promotional Effects of La on Rb-K/AC Catalysts in CF3I Synthesis via CHF3 and I2 Gas-Phase Reaction
摘要
Abstract
CF3I is considered as one of the ideal substitutes for Halon 1301 due to its high fire extinguishing performance and environment friendliness. The effect of La promoter on Rb-K/AC catalysts in CF3I synthesis via gas-phase reaction of CHF3 and I2 was investigated by scanning electron microscope(SEM), CO2 temperature programmed desorption (CO2-TPD), thermogravimetry (TG/DTG), X-ray diffraction (XRD), energy dispersive X-ray spectrometer (EDS) and activity tests. The results show that mechanical strength and the amount of basic sites of the catalyst are enhanced following the addition of La which affects the interaction between Rb-K and the support. Peak temperature of CO2 is increased by 30℃ and the peak area also increases. In addition, surface concentrations of Rb and K are improved from 5.5%and 7%to 7.2%and 8.1%, respectively after doping 3 wt%La. Consequently, CHF3 conversion rate increases from 40.2%to 58.7%and CF3I selectivity increases from 52.2%to 57.5%following doping of 3%(wt) La into the Rb-K/AC catalyst. La is confirmed as one of the active phases for CF3I synthesis, and LaOF is identified as an efficient component for CHF3 conversion.关键词
硝酸镧/三氟甲烷/酸碱性/分散度/三氟碘甲烷/活性炭Key words
lanthanum nitrate/trifluoromethane/acidic and basic/dispersion/trifluoroiodomethane/activated carbon分类
化学化工引用本文复制引用
韩文锋,习苗,王志昆,靳碧波,唐浩东,李瑛,刘化章..La对CHF3和I2气相合成CF3I催化剂性能的影响[J].高校化学工程学报,2016,30(6):1372-1379,8.基金项目
钱江人才计划(2013R10056)；浙江省自然科学基金项目(LY12B03007)；浙江省省属科研院所扶持专项(2015F50031)。 （2013R10056）
