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Sains
Malaysiana 49(1)(2020): 75-84
http://dx.doi.org/10.17576/jsm-2020-4901-09
Effect of Crystallinity of Zeolite
Beta on Physicochemical Properties and Performance of Cobalt Catalysts
(Kesan Habluran Beta Zeolit pada Sifat Fisikokimia dan Prestasi Pemangkin
Kobalt)
PIAW PHATAI1, SIRINUCH LOIHA2, SANCHAI PRAYOONPOKARACH3 & JATUPORN
WITTAYAKUN3*
1Department of Chemistry, Faculty of Science, Udon
Thani Rajabhat University, Udon Thani 41000, Thailand
2Department of Chemistry, Faculty of Science,
Khon Kaen University, Khon Kaen 40002, Thailand
3School of Chemistry, Institute of Science,
Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
Received: 6
September 2019/Accepted: 10 October 2019
ABSTRACT
In the present work, the effect of crystallinity of zeolite beta in a
sodium form (NaBEA) on physicochemical properties and performance of NaBEA-supported cobalt catalysts
was investigated. The incipient wetness impregnation method was utilized in
the synthesis of NaBEA-supported cobalt catalysts with various Co loadings (4, 7 and 10 wt. %). NaBEA materials with
high and low crystallinities (NaBEA-H and NaBEA-L) were synthesized using fumed silica with aging times of 72
and 48 h, respectively. In comparison to NaBEA-L, higher XRD peak intensities and surface area were observed
for NaBEA-H. After impregnation, NaBEA-L displayed better dispersion of Co species and lower reducibility
than NaBEA-H due to stronger metal-support interaction. Catalytic performance for n-butane hydrogenolysis via Co/NaBEA-H and Co/NaBEA-L catalysts was compared. In butane hydrogenolysis, the higher conversion was attained
using Co/NaBEA-H with 7 and 10 wt. % when compared to Co/NaBEA-L with similar loadings. Multiple hydrogenolysis occurred on all catalysts producing
methane as the only product. The most effective catalyst was determined to be 7Co/NaBEA-H due to the higher
surface area and uniform particles of the cobalt species.
Keywords: Butane hydrogenolysis; cobalt; crystallinity; metal dispersion; zeolite
beta
ABSTRAK
Dalam kertas ini, kesan habluran beta zeolit dalam bentuk natrium (NaBEA) pada sifat
fisikokimia dan prestasi pemangkin kobalt disokong-NaBEA dikaji. Kaedah impregnasi
basah peringkat awal telah digunakan dalam sintesis pemangkin kobalt
disokong-NaBEA dengan pelbagai pembebanan Co (4, 7 dan 10 % bt.). Bahan NaBEA dengan habluran tinggi dan
rendah (NaBEA-H dan NaBEA-L) telah disintesis menggunakan silika wasap dengan perumuran masa 72 dan
48 jam. Berbanding NaBEA-L, puncak keamatan XRD yang tinggi dan luas permukaan
diperhatikan untuk NaBEA-H. Selepas impregnasi, NaBEA-L menunjukkan serakan spesies Co yang lebih baik dan
pengurangan yang rendah daripada NaBEA-H disebabkan oleh interaksi sokongan logam yang kuat. Prestasi pemangkinan
untuk hidrogenolisis n-butana melalui pemangkin Co/NaBEA-H dan Co/NaBEA-L telah dibandingkan. Dalam hidrogenolisis butana, penukaran tinggi telah dicapai
menggunakan 7 and 10 % bt. Co/NaBEA-H jika dibandingkan dengan Co/NaBEA-L untuk pembebanan yang sama. Pelbagai hidrogenolisis berlaku kepada semua pemangkin yang
mengeluarkan metana. Pemangkin yang paling berkesan adalah 7Co/NaBEA-H disebabkan luas permukaan yang tinggi serta zarah seragam
spesies kobalt.
Kata kunci: Beta zeolit; butana hidrogenolisis; kobalt; habluran; serakan logam
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