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In Situ Hydrothermal Conversion of Silica Gel Precursors to Binderless Zeolite X Pellets for Enhanced Olefin Adsorption
  • +11
  • Hao Jiang,
  • Dan Wang,
  • Jialun Tan,
  • Yuxiang Chen,
  • Yang An,
  • Yonghao Chen,
  • Yuan Wu,
  • Hui Sun,
  • Ben-xian Shen,
  • Di Wu,
  • Jichang Liu,
  • Hao Ling,
  • Jigang ZHAO,
  • Yujun Tong
Hao Jiang
East China University of Science and Technology
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Dan Wang
East China University of Science and Technology
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Jialun Tan
East China University of Science and Technology
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Yuxiang Chen
East China University of Science and Technology
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Yang An
East China University of Science and Technology
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Yonghao Chen
East China University of Science and Technology
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Yuan Wu
East China University of Science and Technology
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Hui Sun
East China University of Science and Technology
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Ben-xian Shen
East China University of Science and Technology
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Di Wu
Washington State University
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Jichang Liu
East China University of Science and Technology
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Hao Ling
East China University of Science and Technology
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Jigang ZHAO
East China University of Science and Technology, Shanghai
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Yujun Tong
Sinopec Dalian Research Institute of Petroleum and Petrochemicals
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Abstract

Binderless zeolite X pellets were “one-pot” synthesized via in situ hydrothermal conversion of silica gel precursors in sodium aluminate solution. The conversion and crystallization kinetics were investigated as a function of synthesis time with a spectrum of techniques. It is found that four-membered (4R) and six-membered rings (6R) are formed by linking diffused Al species with dissolved Si species during the aging period, while the zeolite X frameworks are constructed via reorganization of β cages with double six-membered rings (D6R) in crystallization process. Furthermore, GCMC simulation was conducted to elucidate 1-hexene adsorption in zeolite X as ion species and exchange degree vary, in which adsorption capacity and guest – host interaction energy were evaluated. Incorporation of Mg2+ and Ca2+ enables higher adsorption capacity, while introduction of Co2+, Ni2+, Cu2+ and Zn2+ boosts adsorption and enhances interaction energy.