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Enhui Yuan,Zhicheng Tang,Kun Zhang,Gongxuan Lu,Zunli Mo 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.42 No.-
We reported a new one-pot method to synthesize Cu incorporated ZSM-5 with ethylene diaminetetraacetic acid copper disodium salt hydrate (EDTA-Cu) as copper source by a hydrothermal process. Theobtained isomorphous substituted Cu-ZSM-5 exhibits more excellent reactivity for selective catalyticreduction of NOx by NH3 with long term stability than their conventional copper impregnatedcounterparts. The results indicate that the tetracoordinated Cu species in the ZSM-5 frameworks havesuperior catalytic properties than the Cu species existed outside the ZSM-5 zeolites frameworks. Thenovel ammonium salt complex method was used for thefirst time to synthesize the metal-ZSM-5 molecular sieves.
High performance phosphorus-modified ZSM-5 zeolite for butene catalytic cracking
Xionghou Gao,Zhicheng Tang,Haitao Zhang,Conghua Liu,Zhongdong Zhang,Gongxuan Lu,Dong Ji 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.3
Phosphorus-modified ZSM-5 zeolites were prepared with a novel method, hydrothermal dispersion. XRD showed that the catalysts prepared by the hydrothermal dispersion had better hydrothermal stability than that by impregnation. At the same time, more pronounced cracking activity and higher yield of ethylene plus propylene were obtained on the phosphorus-modified ZSM-5 catalysts prepared by hydrothermal dispersion. Highest yield of ethylene plus propylene was obtained when the loading of phosphorus was 0.68%. The higher amount of phosphorus fixed on the pores of zeolite, higher hydrothermal stability and appropriate acid amount were the possible reasons for obtaining higher yield of ethylene plus propylene.
Haijun Zhao,Weiliang Han,Fang Dong,Zhicheng Tang 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
High specific surface area CeMn/TiO2–SiO2 catalysts were synthesized and evaluated for the catalytic combustion of 1,2-dichlorobenzene (o-DCB). Mesoporous TiO2–SiO2 supports were prepared by evaporation-induced self-assembly (EISA) method to investigate the promotion of Si on the acid properties of TiO2. Pore structures of TiO2–SiO2 were modulated by controlling the amount of hydrochloric acid during the preparation process of mesoporous supports, and the influence of structures and physicochemical properties of CeMn/TiO2–SiO2 catalysts on the activity and stability of o-DCB catalytic combustion were thoroughly studied. The results showed that Mn cations incorporated into CeO2 fluorite structure caused the formation of more active oxygen species. The active oxygen species and high specific surface area of catalysts played significant roles in o-DCB oxidation reaction. The influence of water on o-DCB catalytic combustion was also studied, and two different observations were obtained at low or high content of water. Due to deposition of Cl species on the surface of catalyst, CeMn/TiO2–SiO2 loses partial activity during o-DCB catalytic combustion, and most of activity could be recovered through Deacon reaction.
Huang Xiaosheng,Zhang Guodong,Dong Fang,Tang Zhicheng 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
A promising CeWTiOx catalyst for selective catalytic reduction of NOx with NH3 had been prepared by a facile one-pot solvothermal method, and the NO conversion could reach to 84% at 180 °C and maintain above 92% at the temperature range 200–460 °C. According to the NH3-TPD and N2 adsorption–desorption, surface acidity and surface area (229.44 m2/g) of the catalysts were enhanced significantly, both of them were beneficial to the NH3 adsorption in the SCR process. Besides, the results of XRD, XPS, Raman spectra and TEM indicated that the high dispersion of cerium active species as well as tungsten on anatase TiO2 was also indispensably for the excellent SCR performance. Combined with the strong reduction capacity from H2-TPR analysis as well as the enrichment of oxygen vacancy, it deserved the fine catalytic ability. More importantly, the strong synergistic effect between the Ce–W–Ti formed in the solvothermal system enhanced the catalyst’s resistance to H2O and SO2. Thus the solvothermal synthesis showed an attractive perspective in the preparation of metal oxides catalysts for the SCR process.
Textual properties of Cu–Mn mixed oxides and application for methyl formate synthesis from syngas
Haijun Zhao,Kegong Fang,Fang Dong,Minggui Lin,Yuhan Sun,Zhicheng Tang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-
Cu–Mn mixed oxides with different calcination temperatures were prepared using ammonia complexing method and evaluated for methyl formate (MF) synthesis from syngas with CaO–ZrO2 as co-catalyst. The influence of calcination temperature on the structure and properties of Cu–Mn mixed oxides was investigated by appropriate characterizations. Cu1.5Mn1.5O4 formed during the calcination of Cu–Mn catalyst at 450 C and played a significant role in the MF synthesis. However, it partially decomposed into CuO and MnO2 when the calcination temperature exceeded 550 C. Results showed that the optimum MF selectivity was obtained on Cu–Mn catalyst calcined at 450 C, and the highest CO conversion was obtained on the Cu–Mn sample with calcination temperature of 550 C. The reaction mechanism of MF synthesis from syngas over Cu–Mn mixed oxides and CaO–ZrO2 co-catalyst was thoroughly studied via typical model reactions, and the nucleophilic addition–elimination reaction mechanism was proposed.
Application of new porous binder material in fluid catalytic cracking reaction
Xionghou Gao,Gongxuan Lu,Haitao Zhang,Baojie Wang,Zhicheng Tang 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.2
A novel porous binder was obtained by acid-treated kaolin. This new binder owned abundant mesomacro pore and good hydrothermal stability. The prepared catalyst using new binder had a character of low attrition index and large pore volume. The catalysts were tested in a fixed-fluidized bed unit. Compared with comparison sample, the conversion of new catalyst was increased by 0.73%, heavy oil yield decreased by 1.11%, the total liquid and light oil yield increased by 0.95% and 0.74%, respectively. The perfect pore structure and good hydrothermal stability of new binder were the possible reason of obtaining prominent performance.