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Comparative study on pyrolysis of bamboo in microwave pyrolysis-reforming reaction by binary compound impregnation and chemical liquid deposition modified HZSM-5

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Journal of Environmental Sciences 2020年第8期32卷 186-196页

作者： Haoran Du Zhaoping Zhong Bo Zhang Kun Shi Zhaoying Li Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education Southeast UniversityJiangsu 210096China

The deactivation of catalyst is a significant reason for its limited application during the catalytic fast pyrolysis(CFP)*** reduce the coke formation,binary compound impregnation(BCI)and chemical liquid deposition(CLD)were used to modify HZSM-5 *** the same time,the self-designed microwave reactor separated the pyrolysis of bamboo and catalytic upgrading of primary vapor,which made the catalytic effect more *** results indicated that CLD used TiO 2 deposition to cover external acid sites,while BCI by phosphorus-nickel could cover and partly destroy superficial acid sites through two different *** the scope of the loaded amount studied,the yield of aromatic hydrocarbons in the oil phase increased at first and then decreased,while the coke formation reduced ***(benzene,toluene and xylene),the most valuable product in bio-oil,drastically increased by 39.1%and 22.6%respectively over the CLD and BCI modified *** the catalytic performance as well as cost,CLD over HZSM-5 has more advantages in the CFP process to upgrade bio-oil.

关键词： Bamboo Modified HZSM-5 Microwave Binary compound impregnation chemical liquid deposition

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Disproportionation of Toluene by Modified ZSM-5 Zeolite Catalysts with High Shape-selectivity Prepared Using chemical liquid deposition with Tetraethyl Orthosilicate

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Chinese Journal of chemical Engineering 2011年第2期19卷 292-298页

作者：腾晖王军任晓乾陈德民 State Key Laboratory of MateriaIs-Oriented chemical Engineering College of Chemistry and Chemical Engineering Nanjing University of Technology Nanjing 210009 China

Shape-selective catalysts for the disproportionation of toluene were prepared by the modification of the cylinder-shaped ZSM-5 zeolite extrudates with chemical liquid deposition with TEOS （tetraethyl orthosilicate）.Various parameters for preparing catalysts were changed to investigate the suitable *** resulting cata-lysts were tested in a pressured fixed bed reactor and characterized by SEM （scanning electron microscopy）.The conversion of toluene and para-xylene selectivity were influenced remarkably by the n（SiO2）/n（Al2O3） ratio of ZSM-5 zeolite,the type and amount of deposition agent,acid and solvent used,and the time and cycle of deposition *** was proved to be a more efficient agent than the conventional polysiloxanes when the deposition amount was *** catalyst prepared at the suitable conditions exhibited a high para-xylene selectivity of 91.1% with considerable high conversion of 25.6%.SEM analyses confirmed the formation of a layer of amorphous silica on the external surface of ZSM-5 zeolie crystals,which was responsible for the highly enhanced shape-selectivity.

关键词： shape-selective catalysis ZSM-5 zeolite disproportionation of toluene chemical liquid deposition tet-raethyl orthosilicate

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Microstructure and properties of SiC gradiently coated C_f/C composites prepared by a RCLD method

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International Journal of Minerals,Metallurgy and Materials 2009年第3期16卷 334-338页

作者： Jun-hua Chen Guang-li Chen Hao-ran Geng Yan Wang School of Materials Science and Engineering Shandong University Jinan 250061 China School of Materials Science and Engineering University of Jinan Jinan 250022 China

The SiC gradiently coated carbon fiber/carbon （Cf/C） composites were prepared by a two-step rapid chemical liquid deposition （RCLD） method. The microstructure and properties of the composites were investigated using X-ray diffraction, scanning electron microscopy together with energy dispersive X-ray analysis, bending tests, and oxidation tests. The experimental results show that the surface layer of the composites is composed of SiC, pyrocarbon, and carbon fibers. Their inner area consists of pyrocarbon and carbon fibers. The SiC content gradiently decreases with increasing distance from the outer surface to the center of the composites. Furthermore, the thickness of the SiC layer increases with increasing tetraethylorthosilicate content and deposition time. SiC coatings have no significant influence on the bending strength of the composites. However, the oxidation resistance of the composites increases with increasing thickness of the SiC layer.

关键词： carbon fiber reinforced composites chemical liquid deposition bending strength oxidation resistance

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