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

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 dro...

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Autores principales: Wang, Ping, Liu, Hao, Wang, Congxin, Lv, Guang, Wang, Donge, Ma, Huaijun, Tian, Zhijian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9036975/
https://www.ncbi.nlm.nih.gov/pubmed/35478881
http://dx.doi.org/10.1039/d1ra03758g
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author Wang, Ping
Liu, Hao
Wang, Congxin
Lv, Guang
Wang, Donge
Ma, Huaijun
Tian, Zhijian
author_facet Wang, Ping
Liu, Hao
Wang, Congxin
Lv, Guang
Wang, Donge
Ma, Huaijun
Tian, Zhijian
author_sort Wang, Ping
collection PubMed
description 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 Al(2)O(3) : P(2)O(5) : MgO : HF : DPA : [EMIm]Br : H(2)O 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 °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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spelling pubmed-90369752022-04-26 Direct synthesis of shaped MgAPO-11 molecular sieves and the catalytic performance in n-dodecane hydroisomerization Wang, Ping Liu, Hao Wang, Congxin Lv, Guang Wang, Donge Ma, Huaijun Tian, Zhijian RSC Adv Chemistry 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 Al(2)O(3) : P(2)O(5) : MgO : HF : DPA : [EMIm]Br : H(2)O 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 °C. Such a method for the direct synthesis of shaped molecular sieves shows potential for the green synthesis of molecular sieves in industry. The Royal Society of Chemistry 2021-07-21 /pmc/articles/PMC9036975/ /pubmed/35478881 http://dx.doi.org/10.1039/d1ra03758g Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Wang, Ping
Liu, Hao
Wang, Congxin
Lv, Guang
Wang, Donge
Ma, Huaijun
Tian, Zhijian
Direct synthesis of shaped MgAPO-11 molecular sieves and the catalytic performance in n-dodecane hydroisomerization
title Direct synthesis of shaped MgAPO-11 molecular sieves and the catalytic performance in n-dodecane hydroisomerization
title_full Direct synthesis of shaped MgAPO-11 molecular sieves and the catalytic performance in n-dodecane hydroisomerization
title_fullStr Direct synthesis of shaped MgAPO-11 molecular sieves and the catalytic performance in n-dodecane hydroisomerization
title_full_unstemmed Direct synthesis of shaped MgAPO-11 molecular sieves and the catalytic performance in n-dodecane hydroisomerization
title_short Direct synthesis of shaped MgAPO-11 molecular sieves and the catalytic performance in n-dodecane hydroisomerization
title_sort direct synthesis of shaped mgapo-11 molecular sieves and the catalytic performance in n-dodecane hydroisomerization
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9036975/
https://www.ncbi.nlm.nih.gov/pubmed/35478881
http://dx.doi.org/10.1039/d1ra03758g
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