Zinc acetate supported on N-doped activated carbon as catalysts for acetylene acetoxylation

Wu, Xueyi; He, Peijie; Wang, Xugen; Dai, Bin

doi:10.1016/j.cej.2016.09.090

Cited by 35 publications

(22 citation statements)

References 18 publications

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“…Meanwhile, Zn1Co0.3/AC has a larger desorption peak area than that of the Zn(OAc)2/AC catalyst. Our previous work shows that the excessive acetylene adsorption is one of the important reasons for catalyst deactivation [19]. The TPD results suggested that the addition of Co weakened the adsorption of C2H2, but greatly enhanced the adsorption of HAc, thereby enhancing the catalytic performance of the catalysts.…”

Section: Effect Of Co On the Zinc Catalyst Before The Reactionmentioning

confidence: 98%

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A Novel High-Activity Zn-Co Catalyst for Acetylene Acetoxylation

Huang

et al. 2018

Catalysts

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In this paper, Zn(OAc) 2 /AC and Zn-Co/AC catalysts were prepared and applied in an acetylene acetoxylation reaction. Compared with monometallic Zn(OAc) 2 /AC catalyst, which is widely applied in industry, the Zn-Co catalysts exhibited excellent catalytic performance. Transmission electron microscopy results displayed that the addition of cobalt improved the dispersity of zinc acetate particles and inhibited catalyst sintering on the catalyst surface. X-ray photoelectron spectra suggested that the Co additive changed the electron density of zinc acetate probably because of the interaction between Zn and Co species. Temperature programmed desorption analysis demonstrated Co additive strengthened the adsorption of acetic acid and weakened the adsorption of acetylene.

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Section: Effect Of Co On the Zinc Catalyst Before The Reactionmentioning

confidence: 98%

“…The yield of synthetic vinyl acetate exceeded 1000 g mol −1 h −1 . Dai et al [19] developed a new high performance catalyst by using nitrogen-doped activated carbon as the catalyst carrier. The activity of the modified catalyst was greatly improved under the same conditions.…”

Section: Introductionmentioning

confidence: 99%

A Novel High-Activity Zn-Co Catalyst for Acetylene Acetoxylation

Huang

et al. 2018

Catalysts

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“…Regarding this mechanism, the rate-limiting step is the adsorption of acetylene [ 6 ]. Some scholars [ 7 , 8 , 9 ] have demonstrated that the adsorption strength and capacity of acetylene significantly influences the acetylene acetoxylation reaction. Thus, the regulation of the adsorption of acetylene must be considered in the field of catalysis science.…”

Section: Introductionmentioning

confidence: 99%

“…Thus far, various studies on the supports and catalysts of the acetylene acetoxylation reaction, including N [ 9 , 10 ] and B-doped ACs [ 11 ] as the support and metal additives [ 8 ], have been developed through the density functional theory (DFT) investigation [ 7 ]. Further, heteroatom-doping via the introduction of heteroatoms such as B [ 11 ] and N [ 9 , 10 ], has been employed to change the surface electronic structure of AC and adjust the interaction among the different atoms inside, changing the adsorption capability of the catalyst and improving the conversion rate of acetic acid. Dong et al [ 7 ] calculated the bond energy between zinc acetate and different oxygen-containing groups (OCGs) and estimated the complexity of the reaction that occurred in the active sites (zinc acetate that was adsorbed on the hydroxyl (–OH) and carboxyl (–COOH)).…”

Section: Introductionmentioning

confidence: 99%

“…The roles of different OCGs have been revealed superficially by demonstrating that the reaction barriers of the rate-limiting step in this case was reduced by the existence of –COOH. Although many scholars achieved slightly positive results on the acetoxylation of acetylene, the following series of challenges still exist: the low conversion of acetic acid and the mechanization of OCGs [ 8 , 9 ]; the slightly higher OCGs contents cause the low utilization of the zinc component [ 10 ] and the DFT results of OCGs have not been effectively supported experimentally [ 7 ]. Whether the specific influence of OCGs on the acetoxylation of acetylene is due to the interaction of OCGs with zinc, electron transfer, or other phenomena such as the adsorption capacity, which strongly impacts the catalytic performance of the catalyst, there are no experimental data and characterization measures available.…”

Section: Introductionmentioning

confidence: 99%

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

Zhu

Kang

2021

Nanomaterials

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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.

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Ionic Liquid‐Silver Catalysts for Acetylene Acetoxylation at Low‐Temperature

Zhuang,

Zhang,

Zhu

et al. 2024

ChemCatChem

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It was crucial to develop a catalyst with high catalytic activity at iow temperatures, as the zinc‐based catalysts were prone to deactivation in the high‐temperature reaction of acetylene acetoxylation, and ionic liquid (IL)‐silver (Ag) catalysts were synthesized and applied in acetylene acetoxylation. The X‐ray diffraction, transmission electron microscopy, and X‐ray photoelectron spectroscopy characterizations displayed that Ag species were stabilized in the state of Ag+, and the dispersion of the Ag active species was effectively improved in supported‐ionic‐liquid‐phase (SILP) system. Furthermore, we prepared Ag‐IL liquid phase catalysts for catalyzing acetylene acetoxylation in liquid phase systems. It was demonstrated that the presence of ILs could effectively stabilize the Ag+ active site. The catalytic performance of the Ag‐IL/AC catalyst prepared in this article at a low temperature of 180 °C was 2.5 times that of the traditional Zn/AC catalyst. The development of low‐temperature catalysts would play a driving role in the development of acetylene acetoxylation.

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Zinc acetate supported on N-doped activated carbon as catalysts for acetylene acetoxylation

Cited by 35 publications

References 18 publications

A Novel High-Activity Zn-Co Catalyst for Acetylene Acetoxylation

A Novel High-Activity Zn-Co Catalyst for Acetylene Acetoxylation

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

Ionic Liquid‐Silver Catalysts for Acetylene Acetoxylation at Low‐Temperature

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