Synthesis of NaY zeolite from a submolten depolymerized perlite:Alkalinity effect and crystallization kinetics

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外文摘要：NaY zeolites are synthesized using submolten salt depolymerized natural perlite mineral as the main silica and alumina sources in a 0.94 L stirred crystallizer. Effects of alkalinity ranging from 0.38 to 0.55 (n(Na2O)/n(SiO2)) on the relative crystallinity, textural properties and crystallization kinetics were investigated. The results show that alkalinity exerts a nonmonotonic influence on the relative crystal-linity and textural properties, which exhibit a maximum at the alkalinity of 0.43. The nucleation kinetics are studied by fitting the experimental data of relative crystallinity with the Gualtieri model. It is shown that the nucleation rate constant increases with increasing alkalinity, while the duration period of nucleation decreases with increasing alkalinity. For n(Na2O)/n(SiO2) ratios ranging from 0.38 to 0.55, the as-synthesized NaY zeolites exhibit narrower crystal size distributions with the increase in alkalinity. The growth rates determined from the variations of average crystal size with time are 51.09, 157.50, 46.17 and 24.75 nm·h-1, respectively. It is found that the larger average crystal sizes at the alkalinity of 0.38 and 0.43 are attributed to the dominant role of crystal growth over nucleation. Furthermore, the combined action of prominent crystal growth and the longer duration periods of nucleation at the alkalinity of 0.38 and 0.43 results in broader crystal size distributions. The findings demonstrate that control of the properties of NaY zeolite and the crystallization kinetics can be achieved by conducting the crystalli-zation process in an appropriate range of alkalinity of the reaction mixture.

外文关键词：

NaY zeoliteSubmolten salt depolymerized perliteAlkalinityCrystallization kinetics

作者：

Yanli Qu、Peng Dong、Li Yang、Yuanyuan Yue、Haoliang Wang、Jingcai Cheng、Chao Yang

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作者单位：

CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Petroleum Molecular &Process Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100190, China

Qingyuan Innovation Laboratory, Quanzhou 362801, China

National Engineering Research Center of Chemical Fertilizer Catalyst, College of Chemical Engineering, Fuzhou University, Fuzhou 350108, China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key Research and Development ProgramNingxia Natural Science FoundationExternal Cooperation Program of BIC,Chinese Academy of SciencesCAS Project for Young Scientists in Basic Research

项目编号：

219380092230835822208346220783322022YFC39027012021AAC01002122111KYSB20190032YSBR-038

出版年：

2024

DOI：

10.1016/j.cjche.2024.03.009

中国化学工程学报(英文版)

中国化工学会

中国化学工程学报(英文版)

CSTPCDEI

影响因子：0.818

ISSN：1004-9541

年,卷(期)：2024.70(6)