2003
DOI: 10.1016/s0020-1693(03)00032-x
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Post-synthetic thermal and chemical treatments of H-BEA zeolite: effects on the catalytic activity

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Cited by 47 publications
(25 citation statements)
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“…c) Conversion and selectivity: see Tables 1 and 2. and γ-Al2O3, estimated by pyridine adsorption 13) , may be in the order: H-ZSM-5(29) (94%)>H-MOR(18.3) (83%)>γ-Al2O3 (50%) 11) . Therefore, an extremely high percentage of Brønsted acid sites of 94% may be required for propylene formation.…”
Section: Nh3-tpd Investigations Of La W/h-zsm-5 Andmentioning
confidence: 99%
“…c) Conversion and selectivity: see Tables 1 and 2. and γ-Al2O3, estimated by pyridine adsorption 13) , may be in the order: H-ZSM-5(29) (94%)>H-MOR(18.3) (83%)>γ-Al2O3 (50%) 11) . Therefore, an extremely high percentage of Brønsted acid sites of 94% may be required for propylene formation.…”
Section: Nh3-tpd Investigations Of La W/h-zsm-5 Andmentioning
confidence: 99%
“…Material alam yang berpotensi dijadikan sebagai material pengikat ion adalah material dari jenis zeolite dan clay [4][5]. Selain harganya murah, ketersediaan material tersebut di alam juga melimpah, akan tetapi pada kondisi alaminya kemampuan sorpsi dari kedua jenis material tersebut masih rendah.…”
Section: Pendahuluanunclassified
“…Namun, semua material memiliki puncak-puncak dominan yang identik di derah 1000 cm -1 dan 796 cm -1 . Kedua puncak tersebut dihasilkan oleh vibrasi asymmetric stretching (νas) dari ikatan Si-O (Si) dan Si-O (Al) [3][4][5]. Kedua puncak…”
Section: Hasil Dan Pembahasanunclassified
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“…2 and Table 2. The concentration of acid sites could be determined by the amount of desorbed ammonia, while the peak temperature of NH 3 desorption reflected the strength of acid sites [29]. The NH 3 -TPD profile of Beta zeolite exhibited two desorption peaks centered at 260°C and 394°C, corresponding to the weak acid sites and strong acid sites, respectively.…”
Section: Characterization Of Acidity Of X%k/beta By Nh 3 -Tpd and Ft-irmentioning
confidence: 99%