acid zeolites
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2022 ◽  
pp. 118480
Author(s):  
Pablo Juárez ◽  
Clara López-Aguado ◽  
Marta Paniagua ◽  
Juan A. Melero ◽  
Rafael Mariscal ◽  
...  

Author(s):  
Alexandre Ferreira Young ◽  
Pedro Nothaft Romano ◽  
João Monnerat Araújo Ribeiro de Almeida ◽  
Donato Alexandre Gomes Aranda

Author(s):  
Anisa Tariq ◽  
Jonathan Ruiz Esquius ◽  
Thomas E. Davies ◽  
Michael Bowker ◽  
Stuart H. Taylor ◽  
...  

AbstractCu/ZnO methanol catalysts were deposited over several ZSM-5 acid zeolites to directly synthesise oxygenates (methanol and dimethyl ether) from a CO2/H2 feed. Catalysts were prepared by two different preparation methodologies: chemical vapour impregnation (CZZ-CVI) and oxalate gel precipitation (CZZ-OG). Chemical vapour impregnation led to Cu/ZnO being deposited on the zeolite surface, whilst oxalate gel precipitation led to the formation of Cu/ZnO agglomerates. For both sets of catalysts a higher concentration of mild and strong acid sites were produced, compared to the parent ZSM-5 zeolites, and CZZ-CVI had a higher concentration of acid sites compared to CZZ-OG. Nevertheless, CZZ-OG shows considerably higher oxygenate productivity, 1322 mmol Kgcat−1 h−1, compared to 192 mmol Kgcat−1 h−1 over CZZ-CVI (ZSM-5(50), 250 ℃, 20 bar, CO2/H2 = 1/3, 30 ml min−1), which could be assigned to a combination of smaller particle size and enhanced methanol mass transfer within the zeolites.


Author(s):  
Jason S. Lee ◽  
Stavros Caratzoulas ◽  
Raul F. Lobo
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2021 ◽  
Vol 155 ◽  
pp. 105050
Author(s):  
Young-Kwon Park ◽  
Muhammad Zain Siddiqui ◽  
Selhan Karagöz ◽  
Tae Uk Han ◽  
Atsushi Watanabe ◽  
...  
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