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Reconstruction of Cu–ZnO catalyst by organic acid and deactivation mechanism in liquid-phase hydrogenation

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 9, Pages 1311-1319 doi: 10.1007/s11705-022-2281-9

Abstract: active site Cu⁺, while the latter two forms of ZnO took the main responsibility for the deactivationmethod resulted in a new Cu–ZnO catalyst with more Cu⁺ and less ZnO species that leads to deactivationFurthermore, the deactivation mechanism of Cu–ZnO catalysts in liquid-phase diester hydrogenation incatalysts via transesterification catalyzed by weakly interacted ZnO and isolated ZnO leads to the deactivation

Keywords： liquid phase hydrogenation Cu–ZnO deactivation mechanism 1 4-butanediol diester

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Deactivation and regeneration of TS-1/SiO

Hainan SHI, Yaquan WANG, Guoqiang WU, Wenping FENG, Yi Lin, Teng ZHANG, Xing JIN, Shuhai WANG, Xiaoxue WU, Pengxu YAO

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 2, Pages 202-209 doi: 10.1007/s11705-013-1328-3

Abstract: The major reason of the catalyst deactivation was the blockage of the channels of the catalyst by bulky

Keywords： TS-1/SiO₂ epoxidation of propylene fixed-bed reactor deactivation regeneration

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Catalysis and deactivation of montmorillonite K10 in the aryl O -glycosylation of glycosyl trichloroacetoimidates

Xiaoliu LI, Xinhao YAN, Zhiwei LI, Hua CHEN, Pingzhu ZHANG,

Frontiers of Chemical Science and Engineering 2010, Volume 4, Issue 3, Pages 342-347 doi: 10.1007/s11705-009-0279-1

Abstract: trichloroacetamide molecule deposits on the MK10, which blocks and poisons the active sites, resulting in the deactivation

Keywords： photoelectron spectroscopy adsorption-desorption glycosylation deactivated diffraction

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Chemical deactivation of V

Xiaodong WU, Wenchao YU, Zhichun SI, Duan WENG

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 3, Pages 420-427 doi: 10.1007/s11783-013-0489-0

Abstract: The deactivation effects of poisoning agents follow the sequence of KCl>KOH>>NH Cl.The more severe deactivation of the KCl-treated catalyst can be mainly ascribed to the higher amount

Keywords： V₂O₅-WO₃/TiO₂ potassium chloride poisoning reducibility acid sites

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Kinetic model for hydroisomerization reaction of C-aromatics

XU Ouguan, SU Hongye, JIN Xiaoming, CHU Jian

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 1, Pages 10-16 doi: 10.1007/s11705-008-0015-2

Abstract: An empirical catalyst deactivation function is incorporated into the model accounting for the loss in

Keywords： ordinary differential Runge-Kutta catalyst deactivation C-paraffins optimization

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Effective regeneration of thermally deactivated commercial V-W-Ti catalysts

Xuesong SHANG, Jianrong LI, Xiaowei YU, Jinsheng CHEN, Chi HE

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 1, Pages 38-46 doi: 10.1007/s11705-011-1167-z

Abstract: An effective method for the regeneration of thermally deactivated commercial monolith SCR catalysts was investigated. Two types of regenerated solutions, namely NH Cl (1 mol/L) and dilute H SO (0.5 mol/L), were employed to treat the used catalyst. The effects of temperature and the regeneration process on the structural and textural properties of the catalysts were determined by X-ray diffraction, scanning electron microscopy, N adsorption/desorption, elemental analysis and Fourier transform infrared spectroscopy. The results suggest that the anatase phase of the used catalyst is maintained after exposure to high temperatures. Some of the catalytic activity was restored after regeneration. The catalyst regenerated by aqueous NH Cl had a higher activity than that of the catalyst treated by dilute H SO . The main reason is that the NH generated from the decomposition of NH Cl at high temperatures can be adsorbed onto the catalyst which promotes the reaction. The aggregated V O were partially re-dispersed during the regeneration process, and the intrinsic oxidation of ammonia with high concentrations of O is a factor that suppresses the catalytic activity.

Keywords： V₂O₅-WO₃/TiO₂ catalysts thermal deactivation regeneration