Cooperative effect of Fe and Ti species over Fe–Ti–Ox catalysts on the catalytic hydrolysis performance of hydrogen cyanide

• Published in: Applied organometallic chemistry Vol. 34; no. 2
• Main Authors: Zhu, Xinfeng, Mao, Yanli, Liu, Hongpan, Kang, Haiyan, Liu, Biao, Song, Zhongxian, Liu, Xueping, Guo, Yifei, Du, Huixian, Zhang, Qiulin
• Format: Journal Article
• Language: English
• Published: Chichester Wiley Subscription Services, Inc 01.02.2020
• Subjects: Ammonia; Catalysts; Catalytic converters; catalytic hydrolysis; Chemical synthesis; Chemistry; Cyanides; Fe–Ti–Ox; Formic acid; HCN; Hydrogen cyanide; Hydrolysis; interaction; Iron; Phase transitions; reaction mechanism; Selectivity; Titanium; Titanium dioxide
• DOI: 10.1002/aoc.5285
• ISSN: 0268-2605

FeOx, TiO2, and Fe–Ti–Ox catalysts were synthesized and used in the catalytic hydrolysis of hydrogen cyanide (HCN). Nearly 100% HCN conversion was achieved at 250 °C over the Fe–Ti–Ox catalyst. TiO2 rutile was detected over TiO2, but not over Fe–Ti–Ox, which suggested that the interaction between Fe and Ti species could inhibit the TiO2 phase transition. Furthermore, the interaction between Fe and Ti species over Fe–Ti–Ox could promote the selectivity of NH3 and CO. The mechanism of hydrolysis of HCN over FeOx, TiO2, and Fe–Ti–Ox can be given as follows: HCN + H2O → methanamide → ammonium formate → formic acid → H2O + CO. FeOx, TiO2, and Fe–Ti–Ox catalysts were prepared by in situ synthesis and used in the catalytic hydrolysis of hydrogen cyanide. The results indicated that the introduction of FeOx into TiO2 resulted in the creation of Ce3+, oxygen vacancy, and Oads, which can be attributed to the interaction between these two molecules. Fe–Ti–Ox showed the best catalytic performance among the samples studied.