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Mingyuan Zhu,Ling Tang,Guangqing Luo,Lihua Kang,Bin Dai 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.2
To effectively reduce the sulfur content in model fuel, [Bmim]PW/HMS catalyst was synthesized through impregnating the hexagonal mesoporous silica (HMS) support by phosphotungstic acid (HPW) and ionic liquid [Bmim]HSO4. Physical structure characterizations of the catalysts showed that HMS retained mesoporous structure, and [Bmim]PW was well dispersed on the support of HMS. The catalytic activity of the [Bmim]PW/HMS was evaluated in the oxidative desulfurization process, and the optimal reaction conditions including loading of the catalysts, reaction temperature,catalyst amount, O/S (H2O2/sulfur) molar ratio and agitation speed were investigated. Under the optimal reaction conditions, the conversion of benzothiophene (BT), dibenzothiophene (DBT) and 4, 6-dimethyldibenzothiophene (4,6-DMDBT) could reach 79%, 98%, 88%, respectively.
Activated carbon supported VN, Mo2N, and W2N as catalysts for acetylene hydrochlorination
Hui Dai,Mingyuan Zhu,Haiyang Zhang,Feng Yu,Chao Wang,Bin Dai 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.50 No.-
The development of green catalysts for the calcium carbide acetylene method synthesis of vinyl chloridemonomer (VCM), is essential material to industrial polyvinyl chloride production. The original catalystHgCl2 easy to volatile during the reaction lead to environmental pollution. Here we present threedifferent transition metal nitride load into activated carbon (AC): VN/AC, Mo2N/AC, and W2N/AC as novelcatalysts. W2N/AC and Mo2N/AC was a relatively stable catalyst to compared with VN/AC. All of themVCM selectivity can maintain 98%. More HCl ratio for Mo2N/AC lead its acetylene conversion reach 80%. The former two catalysts are promising candidates for acetylene hydrochlorination.
Catalytic performance of a Ti added Pd/SiO2 catalyst for acetylene hydrogenation
Lingyu Zhao,Mingyuan Zhu,Bin Dai,Zhong Wei 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
A series of Pd/SiO2 and Pd–Ti/SiO2 catalysts were prepared by the incipient wetness impregnation method. The catalytic performance for selective hydrogenation of acetylene to ethylene was measured under ‘‘high concentration acetylene’’, ‘‘high space velocity’’ and ‘‘no dilution gas’’ conditions. The crystal structure and particle size of the catalysts were characterized by the X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), nitrogen physisorption using the BET method and transmission electron microscope (TEM). The results showed that the titanium oxide in Pd–Ti/SiO2 catalyst was amorphous and the addition of Ti reduced the particle size of Pd significantly. Comparing to the Pd/SiO2catalyst, the ethylene yield increased from 64.1% to 88.3% under Pd–Ti/SiO2 catalytic system.
Ling Tang,Lihua Kang,Mingyuan Zhu,Guangqin Luo,Bin Dai 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
By incorporating H3PW12O40 (HPW) heteropolyacid into mesoporous TUD-1 materials, a series of HPWTUD-1 catalysts were synthesized. Nitrogen adsorption–desorption isotherm, XRD and FTIR characterizations showed that these catalyst exhibited mesoporous structure, and HPW presented in the catalysts with Keggin structure. The catalytic performances of the HPW-TUD-1 catalysts were tested through the oxidative desulfurization (ODS) process of dibenzothiophene (DBT) model oil. The results showed that the obtained 20HPW-TUD-1 catalyst displayed excellent catalytic activity and recover ability for ODS. The desulfurization rate of DBT reached up to 98.1%, and almost no catalytic activity loss was observed after three recycles of the catalyst.
Wang Jiangfei,Yuan Lihua,Zhu Zhengguang,Yuan Mingyuan 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.11
Aiming at infrared thermal images with different buried depth defects, we study a variety of image segmentation algorithms based on the threshold to develop global search ability and the ability to find the defect area accurately. Firstly, the iterative thresholding method, the maximum entropy method, the minimum error method, the Ostu method and the minimum skewness method are applied to image segmentation of the same infrared thermal image. The study shows that the maximum entropy method and the minimum error method have strong global search capability and can simultaneously extract defects at different depths. However none of these five methods can accurately calculate the defect area at different depths. In order to solve this problem, we put forward a strategy of \divide and conquer". The infrared thermal image is divided into several local thermal maps, with each map containing only one defect, and the defect area is calculated after local image processing of the different buried defects one by one. The results show that, under the \divide and conquer" strategy, the iterative threshold method and the Ostu method have the advantage of high precision and can accurately extract the area of different defects at different depths, with an error of less than 5%.
Chitosan-based porous carbon as a support for Zn-based catalysts in acetylene acetoxylation
Junyu Zhang,Fulong Zhu,Ying Zhang,Mingyuan Zhu,Hongling Li,Bin Dai 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.7
Using the biomass material chitosan as a precursor and potassium citrate (PC) as a substitute for traditionalcorrosive activators such as KOH and ZnCl2, a chitosan-based porous carbon material with high specific surfacearea was successfully prepared and used as a support for the catalytic acetylene acetoxylation reaction. By controllingthe PC content and the calcination temperature, chitosan-based porous carbon with a suitable pore structure and abundantsurface oxygen functional groups was obtained. The inductively coupled plasma analysis confirmed that the zinccontent of the 0.9Zn/CS-PC1-800 catalyst was about 14 wt%, and the acetic acid conversion reached 81%. Furthermore,the scanning electron microscopy and Brunauer-Emmett-Teller (BET) analysis showed that the catalyst carrierwas mesoporous carbon material, and different PC content formed different pore size distribution at different calcinationtemperatures. In addition, X-ray photoelectron spectroscopy analysis demonstrated that the content of O in chitosan-based porous carbon was rich, and PC consumed the O content on the surface of carbon materials duringactivation. Because O content and pore size structure on carrier surface are closely related to acetic acid conversion,reasonable PC content and calcination temperature are very important for acetic acid conversion.
Hydrochlorination of acetylene to vinyl chloride monomer over bimetallic Au–La/SAC catalysts
Haiyang Zhang,Xugen Wang,Longlong Xu,Mingyuan Zhu,Bin Dai 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
Gold and gold-based bimetallic catalysts for acetylene hydrochlorination were prepared with HAuCl44H2O and LaCl37H2O as precursors and analyzed by the characterization methods of BET,XRD, SEM, TG and ICP-AES. The results indicate that pitch-based spherical activated carbon SAC is the optimal carrier; Au/C catalyst deactivates easily for coke deposition and the valence change of Au in the reaction, the addition of lanthanum to gold can weaken the occurrence of coke deposition and inhibit the valence change of gold to improve the stability of the catalyst; Under the reaction conditions of temperature 423 K, C2H2 hourly space velocity (GHSV) 360 h1, feed volume ratio V (HCl)/V (C2H2) = 1.15and Au loading of 1 wt%, the optimal atomic ratio of Au, La (a/a) was 1:3, the conversion of acetylene was up to 98% and the selectivity to VCM was more than 99.8%.