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Influence of Synthesis Parameters with Low Seed Addition on the crystallinity of ZSM-5

China Petroleum Processing & Petrochemical Technology 2013年第4期15卷 44-53页

作者： Wang Songlin Wei Huijuan Tang Ying Wang Xiangyu Li Baojun Institute of Industrial Catalysis College of Chemistry and Molecular Engineering Zhengzhou University

ZSM-5 zeolite microparticles （MPs） were synthesized under hydrothermal condition using a low crystal seed addition approach without template. The synthesis parameters such as the seed addition amount, the SiOJA1203 ratio, the aluminum source, the feeding addition method, aging, and crystallization were investigated. The structure, morphology and composition of the as-synthesized ZSM-5 zeolite MPs were characterized by X-ray powder diffraction （XRD）, scanning electron microscopy （SEM）, laser particle size distribution （PSD） measurements, and inductively coupled plasma-atomic emission spectrometry （ICP-AES）. The SIO2/A1203 ratio of ZSM-5 zeolite MPs was in the range of 20~80. The low seed addition was beneficial to improving the crystallinity and shortening the crystallization time, and the suitable amount of seed was 0.25% （SIO2）. The ZSM-5 zeolite MPs synthesized with aluminium nitrate nonahydrate used as the aluminum source exhibited a relatively high crystallinity. An appropriate aging time could eliminate the effect of feeding addition method and effectively adjust particle size. The particle size of ZSM-5 zeolite obtained at an aging time of 20 h was around 2.0 ***. Prolonging the aging time appropriately could also shorten the high-temperature crystallization time. The suitable aging time was 24 h, and the relative crystallinity of ZSM-5 zeolite could reach up to 99% after crystallization for 24 h at 180 ℃

关键词： aging crystal seed microparticles (MPs) relative crystallinity ZSM-5 zeolite

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Octenyl Succinic Anhydride Modified Early Indica Rice Starches Differing in Amylose Content

Octenyl Succinic Anhydride Modified Early Indica Rice Starch...

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中国食品科学技术学会第五届年会暨第四届东西方食品业高层论坛

作者： GUO-QING HE XIAO-YAN SONG HUI RUAN AND FENG CHEN Department of Food Science and Nutrition,Zhejiang University,Hangzhou 310029,People’s Republic of China,and Department of Food Science and Human Nutrition,Clemson University,Clemson,South Carolina 29634

Seven early indica rice starches with different amylose contents were modified by octenyl uccinic anhydride(OSA)in aqueous suspension systems to evaluate the effect of amylose contents on starch *** crystalline structure and pasting properties of starches were investigated using X-ray diffraction and a Rapid Visco Analyzer(RVA).The results indicated that the amylose content had a positive impact on the OSA *** the amylose content increased from 0 to 39.6%,the degree of substitution increased from 0.024 to 0.030 and the reaction efficiency increased from 62.8 to 77.5%.X-ray diffraction scans confirmed that the amylose was mainly present in the amorphous domain of the granule and was highly substituted after the OSA *** RVA profiles demonstrated that the OSA starches had higher viscosities than their native ***,negative correlations were observed between the amylose content and the major RVA parameters(e.g.,peak viscosity,hot paste viscosity,cool paste viscosity,and breakdown viscosity).

关键词： Early indica rice OSA starch amylase content relative crystallinity pasting properties

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