Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Synthesis of Zeolite W from Various Aging Times: Characterization, H+ Ion Exchange and Enhanced Catalytic Activity for Methanol Dehydration to Dimethyl Ether
https://orcid.org/https://orcid.org/0000-0002-2506-1999
https://orcid.org/https://orcid.org/0000-0002-5229-0930
https://orcid.org/https://orcid.org/0000-0002-7960-2615
Zeolites W were prepared from various aging times in the precursor gel by a hydrothermal method, then ion-exchanged to be H-formed catalysts. The products were characterized and the corresponding H+-exchanged zeolite crystals were compared as catalysts for methanol dehydration. The results revealed that the aging step prior to crystallization strongly affected the crystal morphology and Si/Al atom ratio of zeolite samples. Zeolites W obtained transferred from twin-ball to bouquet-like in shape with aging time increased from 0 to 24 h, the Si/Al atom ratios of zeolite samples were measured to be 4.2, 4.2, 4.0, 3.8, 3.7, and 3.7 for the synthesis gel with the aging time of 0, 2, 3, 6, 12, and 24 h, respectively. Zeolite W kept its crystal structure after H+ exchange, however, the introduction of H+ ions into zeolite would result in a decrease in the intensity of all crystallographic reflexes. Moreover, the corresponding H+-exchanged zeolite crystals with longer aging time in the precursor gel were shown to exhibit better catalytic activities for dehydration of methanol to DME, the reason may be due to the low Si/Al ratio which meant more aluminum incorporated in the zeolite framework, resulting in its higher acidity.
Synthesis of Zeolite W from Various Aging Times: Characterization, H+ Ion Exchange and Enhanced Catalytic Activity for Methanol Dehydration to Dimethyl Ether
https://orcid.org/https://orcid.org/0000-0002-2506-1999
https://orcid.org/https://orcid.org/0000-0002-5229-0930
https://orcid.org/https://orcid.org/0000-0002-7960-2615
Zeolites W were prepared from various aging times in the precursor gel by a hydrothermal method, then ion-exchanged to be H-formed catalysts. The products were characterized and the corresponding H+-exchanged zeolite crystals were compared as catalysts for methanol dehydration. The results revealed that the aging step prior to crystallization strongly affected the crystal morphology and Si/Al atom ratio of zeolite samples. Zeolites W obtained transferred from twin-ball to bouquet-like in shape with aging time increased from 0 to 24 h, the Si/Al atom ratios of zeolite samples were measured to be 4.2, 4.2, 4.0, 3.8, 3.7, and 3.7 for the synthesis gel with the aging time of 0, 2, 3, 6, 12, and 24 h, respectively. Zeolite W kept its crystal structure after H+ exchange, however, the introduction of H+ ions into zeolite would result in a decrease in the intensity of all crystallographic reflexes. Moreover, the corresponding H+-exchanged zeolite crystals with longer aging time in the precursor gel were shown to exhibit better catalytic activities for dehydration of methanol to DME, the reason may be due to the low Si/Al ratio which meant more aluminum incorporated in the zeolite framework, resulting in its higher acidity.
Synthesis of Zeolite W from Various Aging Times: Characterization, H+ Ion Exchange and Enhanced Catalytic Activity for Methanol Dehydration to Dimethyl Ether
https://orcid.org/https://orcid.org/0000-0002-2506-1999
https://orcid.org/https://orcid.org/0000-0002-5229-0930
https://orcid.org/https://orcid.org/0000-0002-7960-2615
Zeolites W were prepared from various aging times in the precursor gel by a hydrothermal method, then ion-exchanged to be H-formed catalysts. The products were characterized and the corresponding H+-exchanged zeolite crystals were compared as catalysts for methanol dehydration. The results revealed that the aging step prior to crystallization strongly affected the crystal morphology and Si/Al atom ratio of zeolite samples. Zeolites W obtained transferred from twin-ball to bouquet-like in shape with aging time increased from 0 to 24 h, the Si/Al atom ratios of zeolite samples were measured to be 4.2, 4.2, 4.0, 3.8, 3.7, and 3.7 for the synthesis gel with the aging time of 0, 2, 3, 6, 12, and 24 h, respectively. Zeolite W kept its crystal structure after H+ exchange, however, the introduction of H+ ions into zeolite would result in a decrease in the intensity of all crystallographic reflexes. Moreover, the corresponding H+-exchanged zeolite crystals with longer aging time in the precursor gel were shown to exhibit better catalytic activities for dehydration of methanol to DME, the reason may be due to the low Si/Al ratio which meant more aluminum incorporated in the zeolite framework, resulting in its higher acidity.
Synthesis of Zeolite W from Various Aging Times: Characterization, H+ Ion Exchange and Enhanced Catalytic Activity for Methanol Dehydration to Dimethyl Ether
Pet. Chem.
Zhang, Xu (Autor:in) / Yang, Shaowen (Autor:in) / Liu, Qianrun (Autor:in)
Petroleum Chemistry ; 63 ; 176-182
01.02.2023
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Methanol dehydration to dimethyl ether using modified clinoptilolite
| British Library Online Contents | 2007
Sulfonated catalysts for methanol dehydration to dimethyl ether (DME)
| British Library Online Contents | 2019
Mechanism of olefin synthesis from methanol and dimethyl ether over zeolite catalysts: A review
| Springer Verlag | 2014
Catalytic activity of natural zeolites in the conversion of methanol to dimethyl ether
| Springer Verlag | 2014
Triptane synthesis from methanol and dimethyl ether: A review
| Springer Verlag | 2016