4.6 Article

Direct synthesis of shaped MgAPO-11 molecular sieves and the catalytic performance in n-dodecane hydroisomerization

Journal

RSC ADVANCES
Volume 11, Issue 41, Pages 25364-25374

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ra03758g

Keywords

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Funding

  1. National Key R&D Program of China [2017YFB0306701]
  2. National Natural Science Foundation of China [21406224]
  3. Youth Innovation Promotion Association of CAS [2017228]

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This study demonstrates a method for the direct synthesis of shaped molecular sieves with improved catalytic performance for industrial applications. By utilizing specific experimental steps and ratios, MgAPO-11 molecular sieves with excellent catalytic performance were successfully prepared, showing potential for green synthesis of molecular sieves in industry.
In industrial application, molecular sieves are usually used in a certain shape. This requires the addition of binder and causes the reduction of both the molecular sieve content and catalytic performance. Herein, pseudo-boemite was mixed with deionized water at room temperature, followed by the drop-wise addition of phosphoric acid, magnesium acetate solution, hydrofluoric acid, di-n-propylamine and 1-ethyl-3-methyl imidazolium bromide with vigorous stirring. The molar ratio of Al2O3 : P2O5 : MgO : HF : DPA : [EMIm]Br : H2O in the gel was 1 : 1 : 0.03 : 0.18 : 0.4 : 1 : 45. Then the gel was dried, extruded and directly crystallized to form a shaped MgAPO-11 molecular sieve. X-ray diffraction, scanning electron microscopy, N-2 adsorption, ammonia temperature programmed desorption, pyridine adsorption infrared spectroscopy and nuclear magnetic resonance spectroscopy were used to investigate the physicochemical properties of the samples. X-ray diffraction, scanning electron microscopy and N-2 adsorption tests show that the shaped MgAPO-11 molecular sieve is fully crystallized and possesses hierarchical porosity. Mg is incorporated into the molecular sieve framework and the Pt catalyst supported by the obtained shaped MgAPO-11 exhibits excellent catalytic performance with n-dodecane conversion of 94% and isomer selectivity of 95% at 280 degrees C. Such a method for the direct synthesis of shaped molecular sieves shows potential for the green synthesis of molecular sieves in industry.

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