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Effect of vacuum impregnation on the performance of Co/SiO_2 Fischer-Tropsch catalyst

Journal of Natural Gas Chemistry 2011年第4期20卷 350-355页

作者： Xiaofeng Zhou Qingling Chen Yuewu Tao Huixin Weng Research Center of Petroleum Processing East China University of Science and Technology Shanghai 200237 China Shanghai Research Institute of Petrochemical Technology SINOPEC Shanghai 201208 China

Two silica-supported cobalt catalysts were prepared by incipient wetness impregnation under atmospheric and vacuum conditions.N2 ph- ysisorption,H2 chemisorption,XRD,SEM,TEM,XPS and H2-TPR were used to characterize the *** results showed that the impregnation methods had an effect on the size,dispersion and reducibility of cobalt *** vacuum conditions,cobalt-containing steeping liquor could penetrate into the inner pores of silica support and more bivalent cobalt oxides were formed in the Co3O4 ***,cobalt precursors were rarely inclined to agglomerate and the smaller cobalt particles were uniform on the support,which led to the higher activity of the Co/SiO2（B）catalyst than the normal one under the reaction conditions of 483- 523 K,1 - 2 MPa,gas hourly space velocity of 500–1000 h-1 and molar ratio of H2/CO=0.5 - 2.0.

关键词： Fischer-Tropsch synthesis cobalt catalysts silica vacuum impregnation

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Functionalization of ash gourd:Infusion of citrus peel polyphenols through vacuum impregnation

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Food Bioscience 2022年第6期50卷 1225-1234页

作者： Jyoti Nishad Alka Joshi Shruti Sethi Shalini G.Rudra Eldho Varghese Nishant Shankhwar Arti Bhatia Vivek Saurabh Charanjit Kaur Division of Food Science and Postharvest Technology ICAR-Indian Agricultural Research InstituteNew Delhi110012India ICAR-Central Marine Fisheries Research Institute ErnakulamKochi682018India School of Physics University of HyderabadHyderabad500046TelanganaIndia Division of Environment Science ICAR-Indian Agricultural Research InstituteNew Delhi110012India

Citrus peels have high flavonoids known for potent pharmaceutical and food *** present study explores the infusion of citrus peel polyphenols(CPP)into ash gourd(Benincasa hispida)through vacuum impregnation(VI).The intent was to functionalize ash gourd for diversifying its food *** infused ash gourd(VIAG)cubes were evaluated for physicochemical parameters,total phenolic content(TPC),total flavonoid content(TFC),antioxidant activity(AOX),and sensory *** VI process was optimized through Box-Behnken Design(BBD)of response surface methodology(RSM),considering blanching time,vacuum pressure and vacuum time as independent variables,and TPC,TFC and AOX as dependent *** optimized conditions of blanching pre-treatment(2.21 min),vacuum pressure(432.31 mbar)and time(28.18 min),there was∼300%increase in TPC and *** model validated the mass transfer kinetics for *** evaluation through descriptive analysis revealed no perceived bitterness in ***,it seems that VI is a promising tool for functionalization of ash gourd with bioactives.

关键词： Ash gourd Benincasa hispida Citrus peel Peleg's model RSM vacuum impregnation

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Shape-stablized EP/Paraffin Composite for Latent Heat Storage

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Journal of Wuhan University of Technology(Materials Science) 2013年第4期28卷 682-687页

作者：李文浩徐玲玲 WEI Yanling College of Materials Science and Engineering Nanjing University of Technology Jiangsu Key Laboratory of Process Enhancement & New Energy Equipment Technology (Nanjing University of Technology)

620# and 56# paraffin mixtures were impregnated into expanded perlite （EP） by vacuuming method. Effects of impregnation with/without vacuum, vacuuming time, and thermal cycles were discussed. The appropriate mass fraction of paraffin mixture in the composite and vacuuming time were found respectively to be 80% and 20 min. Fourier transform infrared spectrometer （FT-IR） analysis shows that it has a good compatibility between paraffin mixture and EP. From differential scanning calorimetry （DSC） analysis, the latent heat of EP/Paraffin mixture composite is almost linearly related with the mass fraction of paraffin mixture in the composite. After 100 thermal cycles, the deviation of phase change temperatures is acceptable, but more deviation of latent heat appears. The calcium stearate dispersing granule coated by epoxy resin can effectively lower leakage during thermal cycles.

关键词： paraffin mixture expanded perlite vacuum impregnation thermal cycle test

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Slag Resistance of Magnesite-chrome Brick Impregnated with Chrome-bearing Sols

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China's Refractories 2009年第1期18卷 13-16页

作者： GU Huazhi WANG Houzhi XUE Haitao DENG Yongyue The Hubei Province Key Laboratory of Refractories and CeramicsMinistry-Province Jointly-Constructed Cultivation Base for State Key Laboratory Wuhan University of Science and Technology Wuhan 430081 China

Cr2O3 has eminent slag corrosion resistance. So, the magnesite -chrome brick is thought as an important refractory material used in RH refining furnace in the process of steel-making around the world. After chromebearing sols being prepared by sol-gel method, single sol （ Cr（ OH）3） and mixed sol （ Mg（ OH）2 - Cr（ OH）3） were impregnated into magnesite - chrome bricks by vacuum impregnation. The corrosion resistance of the impregnated bricks to silicon steel slag was studied by porosimetric analysis and fractal dimension calculation. The results showed that the corrosion resistance of impregnated magnesite -chrome brick was better than that of the unimpregnated brick and the brick impregnated by MgSO4 solution, and the one which has surface-treated by Mg（ OH）2 -Cr（OH）3 sol was the best, mainly because of lower apparent porosity, smaller pores diameter and their smoother inner sarface.

关键词： Chrome-bearing sol vacuum impregnation Magnesite -chrome brick Slag resistance

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