Surface species structure of deactivated catalyst for dehydrochlorination of trichloroethane

Ge, Xin; Shen, Haitao; Zhao, Jigang; Wu, Shiyong

doi:10.1080/15567036.2023.2217107

Cited by 5 publications

(5 citation statements)

References 11 publications

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“…The coke species on the surface of acetylene hydrochlorination catalysts used in industry was extracted by a Soxhlet extractor, and then a series of characterizations and calculations were carried out to obtain the average molecular structure of the carbon deposits. Ge et al 28 applied this research method to the dehydrochlorination system of 1,1,2-TCE and also calculated the molecular structure of the spent catalyst surface species.…”

Section: Introductionmentioning

confidence: 99%

Catalyst Deactivation Process in 1,1,2-TCE Catalytic Dehydrochlorination Reaction

Ge,

Zhao,

Yuan

et al. 2024

Ind. Eng. Chem. Res.

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The heterogeneous catalytic splitting reaction of 1,1,2trichloroethane (1,1,2-TCE) was designed to study the process of catalyst deactivation. The results showed that the conversion of 1,1,2-TCE decreased from 51.34 to 44.01%, while the selectivity of vinylidene chloride decreased from 65.12 to 61.77% (260 °C, 8h), which indicated a decrease in catalyst activity. Solid-phase microextraction gas chromatography−mass spectrometry characterization was performed to confirm species on the surface of the spent catalyst. Density functional theory calculations revealed the essence of 1,1,2-TCE splitting to produce different products, and then a possible reaction network was proposed. Tandem side reactions occurred to generate chloroacetylene, which was an unstable species. Chloroacetylene selfpolymerized to form dichlorobutadiene and further polymerized to form aromatic compounds. The coke deposition precursors agglomerated on the surface of the active component, leading to catalyst deactivation. These conclusions explained the deactivation of the catalyst during 1,1,2-TCE dehydrochlorination, thus providing a theoretical basis for further research on methods to inhibit deactivation. Breaking through the key problem of catalyst deactivation would make it possible to replace the saponification reaction with catalytic dehydrochlorination in industry.

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Section: Introductionmentioning

confidence: 99%

Catalyst Deactivation Process in 1,1,2-TCE Catalytic Dehydrochlorination Reaction

Ge,

Zhao,

Yuan

et al. 2024

Ind. Eng. Chem. Res.

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“…The reason for catalyst deactivation was attributed to catalyst coking caused by strong acid centers. Ge et al 9 applied a Soxhlet extractor to extract species on the surface of deactivated catalysts and performed a series of characterizations on the extracts. The combination of elemental analysis and improved B-L model was used to analyze the average molecular structure of surface species of deactivated catalysts.…”

Section: Introductionmentioning

confidence: 99%

Performance Study of Catalysts for Dehydrochlorination Reaction of 1,1,2-TCE Using In Situ FTIR-MS

Ge,

Jiang,

Chen

et al. 2024

Chem Bio Eng.

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“…The first step in the reaction process was not related to the removal of Cl from which C, and it was believed that the reaction product was VDC in the presence of an acid-base dual functional catalyst. Ge [7] et al studied the composition of deactivating substances on the surface of 1,1,2-TCE dehydrochlorination catalysts, and illustrated they were polyaromatics. Yasuhiro Kojima [8] et al used ZSM-5 as catalysts for Cs ion exchange and prepared CsCl, CsNO 3 , CsOH, CH 3 COOCs through plasma precursor exchange Cs@ZSM-5 and evaluated the catalysts performance in a pulse reactor.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Catalytic Cracking Performance of Metal Catalysts for 1,1,2‐TCE

Ge,

Zhao,

Yuan

et al. 2024

ChemistrySelect

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PVDC played an irreplaceable role in the field of sealed packaging, and its polymer monomer, VDC, was in short supply. At present, the saponification of 1,1,2‐TCE and sodium hydroxide was used to generate VDC in industry, which was a process with great environmental pollution. Catalytic dehydrochlorination of 1,1,2‐TCE to produce VDC was a green process route, but the selection of catalysts had always been controversial. This study aimed to screen catalysts suitable for industrial applications. The cesium based catalysts with good catalytic performance were systematically characterized and evaluated, and the overall reaction process was calculated using DFT calculation. The experimental results indicated that the cesium chloride catalyst with a 3 % molar fraction had the best catalytic performance, achieving 55.27 % conversion of 1,1,2‐TCE and 76.85 % selectivity for VDC, respectively. The reaction paths and transition state of several catalysts were calculated by DFT method. It was revealed that the activation energy required for the reaction of CsCl catalyst was the lowest, at 130.61 kcal/mol, and the energy of the product VDC was the lowest, at −63.25 kcal/mol, making it the most stable. The calculation results were consistent with the experimental data, indicating that cesium chloride catalyst had the best reaction performance. Therefore, the subsequent research could focus on the method of improving the supported dispersity of cesium chloride catalyst and the development of core‐shell catalyst to lay the foundation for further industrialization.

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Surface species structure of deactivated catalyst for dehydrochlorination of trichloroethane

Cited by 5 publications

References 11 publications

Catalyst Deactivation Process in 1,1,2-TCE Catalytic Dehydrochlorination Reaction

Catalyst Deactivation Process in 1,1,2-TCE Catalytic Dehydrochlorination Reaction

Performance Study of Catalysts for Dehydrochlorination Reaction of 1,1,2-TCE Using In Situ FTIR-MS

Investigation on Catalytic Cracking Performance of Metal Catalysts for 1,1,2‐TCE

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