High Performance and Stability Bimetallic Zn-La Catalysts for the Hydration of Acetylene.

Acetylene hydration to acetaldehyde is considered as a valuable and potential production route in the acetylene chemical industry. In this work, Zn-La bimetallic catalysts were prepared to improve the catalytic performance and long-term stability of Zn catalyst in the acetylene hydration, and the influence of the impregnation order for the metal components on the catalytic activity of the Zn catalyst was investigated. Moreover, the physicochemical properties of Zn-La bimetallic catalysts could be characterized by XRD, BET, TGA, TEM, XPS, H₂-TPR, C₂H₂-TPD, and ICP-OES. The study indicated that LaCl₃ additive could markedly improve the catalytic performance and stability of the Zn catalyst, and the optimal addition amount of LaCl₃ was 3 wt%. The characterization results showed the addition of the La additive resulted in strong interaction in the bimetallic catalysts, which can not only enhance the adsorption of reactant acetylene but also improved the dispersion of metal components, effectively inhibited carbon deposition, and prevented the loss of Zn components would contribute to the high performance and stability of bimetallic catalysts. Furthermore, first impregnation ZnCl₂ component then that of LaCl₃ component could gain the high-performance and stability bimetallic catalyst in the hydration of acetylene. The La additive resulted in strong interaction in the bimetallic catalysts, which can not only enhanced the adsorption of reactant acetylene but also improved the dispersion of metal components, effectively inhibited carbon deposition, and prevented the loss of Zn components would contribute to the high performance and stability of bimetallic catalysts. [ABSTRACT FROM AUTHOR]