Effect of Oxygen-Containing Group on the Catalytic Performance of Zn/C Catalyst for Acetylene Acetoxylation

Abstract

In this study, a series of activated carbon-based supports with different oxygen-containing groups (OCGs) proportions were obtained via thermal treatment in an ozone flow. Semiquantitative analyses indicated that the performance of the catalyst attained a maximum after 30 min of treatment with ozone flow, and had a positive correlation with the content ratios of carboxyl and hydroxyl groups. Further, temperature-programmed desorption analysis demonstrated that the high performance (63% acetic acid conversion) of the prepared catalyst for the acetoxylation of acetylene could be ascribed to the reduced strength of increased capacity of acetylene adsorption. Density functional theory proved that the additional –COOH in the dicarboxylic catalytic system could be employed as a support for the active sites, and enhancing C2H2 adsorption strength in the rate-limiting step in the actual experimental process effectively accelerated the reaction rate. Thus, the OCGs on the surface of activated carbon play a crucial role in the catalytic performance of the acetylene acetoxylation catalyst.

The Synergetic Effect of Support‐oxygen Groups and Pt Particle Size in the Oxidation of α‐D‐glucose: A Proximity Effect in Adsorption

“…Possible consequences of this interaction are changes in preferential adsorption modes [4a,b] or the stabilization of certain transition states such as has been observed in zeolites [43] . Another plausible cause for the enhancement in reaction rate is a more optimal adsorption strength (the Sabatier principle) resulting from the interaction with nearby oxygen groups [17b] . In fact, the oxidation of glucose to gluconic acid is known to be inhibited by strong adsorption [28,44] since sugar acids are effective chelating agents for metal centres [12a,38e,45] .…”

The Enhancing Effect of Stable Oxygen Functional Groups on Porous-Carbon-Supported Pt Catalysts for Alkaline Hydrogen Evolution

“…The surface oxygen functional groups of the carbon supports were examined by an FTIR analysis. As described in Figure 2f, all the FTIR spectra showed a broad and intense absorption peak at ~3438 cm −1 , which was assigned to the stretching vibration of the O-H (ν O-H) in the hydroxyl groups, carboxyl groups, or adsorbed water [41,42]. The typical peak centered at ~1634 cm −1 belonged to the C=C skeletal vibration of the aromatic rings (ν C=C) [43,44].…”

A novel ZnO/3A catalyst with coking resistance for acetylene acetoxylation

“…[5] The presence of À COOH enhanced the adsorption capacity of acetylene, and improved the catalytic activity. [9] For nitrogen-doped activated carbon, the performance of the catalyst was enhanced by modifying the adsorption intensity of the catalyst on acetylene and acetic acid. [11] Although carbon-supported Zn catalysts have been thoroughly investigated, the catalyst was easily deactivated in the process of acetylene acetoxylation, which inhibited its industrial application.…”