Studies on the Hydrogenation of Acetonitrile over Fresh Mo_2C/γ-Al_2O_3 Catalyst by In-situ IR Spect

• 作 者: Zhang Jing Wu Weicheng Liu Chuang Ding Xiaoguang Chu Gang Zhang Jianguo
• 机 构: Liaoning Shihua University, College of Chemistry, Chemical Engineering and Environmental Engineering
• 出 处: China Petroleum Processing & Petrochemical Technology
• 发表日期: 2015年03期
• 关键词: acetonitrile hydrogenation fresh adsorbed remove spectroscopic selectivity Figur

The adsorption of acetonitrile, the co-adsorption of acetonitrile with CO, and hydrogenation of acetonitrile on fresh Mo2C/γ-Al2O3 catalyst were studied by in situ IR spectroscopy. It was found out that CH3CN exhibited strong interaction with the fresh Mo2C/γ-Al2O3 catalyst and was adsorbed mainly on Moδ+ sites of fresh Mo2C/γ-Al2O3 catalyst. Moreover, CH3CN could affect the shifting of IR spectra for CO adsorption towards a lower wave number. The IR spectroscopic study on acetonitrile hydrogenation showed that CH3CN could be easily hydrogenated in the presence of H2 on the Mo2C/γ-Al2O3 catalyst. Furthermore, it was observed that CH3 CN could be selectively hydrogenated to imines on fresh Mo2C/γ-Al2O3 catalyst. Additionally, the active sites of fresh Mo2C/γ-Al2O3 catalyst might be covered with coke during the hydrogenation reaction of acetonitrile. The treatment of catalyst with hydrogen at 673 K could not completely remove coke deposits on the surface of the Mo2C/γ-Al2O3 catalyst.

The adsorption of acetonitrile, the co-adsorption of acetonitrile with CO, and hydrogenation of acetonitrile on fresh Mo2C / γ-Al2O3 catalyst were studied by in situ IR spectroscopy. It was found out that that CH3CN showed strong interaction with the fresh Mo2C / γ- Al2O3 catalyst and was adsorbed mainly on Moδ + sites of fresh Mo2C / γ-Al2O3 catalyst. Moreover, CH3CN could affect the shifting of IR spectra for CO adsorption towards a lower wave number. The IR spectroscopic study on acetonitrile hydrogenation showed that CH3CN could be it was observed that CH3CN could be selectively hydrogenated to imines on fresh Mo2C / γ-Al2O3 catalyst. Additionally, the active sites of fresh Mo2C / γ- The treatment of catalyst with hydrogen at 673 K could not completely remove coke deposits on the surface of the Mo2C / γ-Al2O3 catal yst.