Sains Malaysiana 47(1)(2018): 207–214
http://dx.doi.org/10.17576/jsm-2018-4701-24
Catalytic
Performance of Cu/ZnO/Al2O3/ZrO2 for
Slurry Methanol Synthesis from CO2 Hydrogenation:
Effect of Cu/Zn Molar Ratio
(Prestasi
Pemangkinan Cu/ZnO/Al2O4/ ZrO2 untuk Sintesis Metanol Sluri daripada
Penghidrogenan CO2: Kesan
Nisbah Molar Cu/Zn)
SALINA SHAHARUN, MAIZATUL S. SHAHARUN*, MOHAMAD F.M. SHAH
& NURUL A. AMER
Universiti Teknologi PETRONAS 32610 Seri
Iskandar, Perak, Darul Ridzuan Malaysia
Diserahkan: 6 Januari 2016/Diterima:
22 Jun 2017
ABSTRACT
Catalytic hydrogenation of carbon dioxide (CO2)
to methanol is an attractive way to recycle and utilize CO2.
A series of Cu/ZnO/Al2O3/ZrO2 catalysts
(CZAZ)
containing different molar ratios of Cu/Zn were prepared by the
co-precipitation method. The catalysts were characterized by
temperature-programmed reduction (TPR), field emission scanning
electron microscopy-energy dispersive x-ray analysis (FESEM-EDX)
and X-ray diffraction (XRD). Higher surface area, SABET values
(42.6-59.9 m2/g) were recorded at low (1)
and high (5) Cu/Zn ratios with the minimum value of 35.71 m2/g
was found for a Cu/Zn of 3. The reducibility of the metal oxides formed after
calcination of catalyst samples was also affected due to change in
metal-support interaction. At a reaction temperature of 443 K, total gas
pressure of 3.0 MPa and 0.1 g/mL of the CZAZ catalyst, the selectivity
to methanol decreased as the Cu/Zn molar ratio increased,
and the maximum selectivity of 93.9 was achieved at Cu/Zn molar
ratio of 0.33. With a reaction time of 3h, the best performing catalyst
was CZAZ75 with Cu/Zn molar ratio of 5 giving methanol yield
of 6.4%.
Keywords: Carbon dioxide; copper; hydrogenation; methanol
synthesis; zinc; zirconia
ABSTRAK
Penghidrogenan pemangkin karbon dioksida (CO2)
kepada metanol adalah satu cara yang menarik untuk mengitar semula penggunaan
CO2. Satu siri pemangkin Cu/ZnO/Al2O3/ZrO2 (CZAZ)
yang mengandungi nisbah molar Cu/Zn yang berbeza disediakan melalui kaedah
pemendakan bersama. Kaedah pencirian yang dijalankan
untuk pemangkin adalah melalui kaedah program penurunan suhu berkala (TPR),
analisis pengimbas mikroskop pemancaran medan-serakan tenaga sinar-x (FESEM-EDX)
dan pembelauan sinar-X (XRD). Luas
permukaan tertinggi telah direkodkan iaitu (42.6-59.9 m2/g)
pada nisbah Cu/Zn rendah (1) dan tinggi (5) dengan nilai minimum 35.71 m2/g
pada nisbah Cu/Zn adalah 3. Kebolehpenurunan oksida
logam yang terbentuk selepas sampel pemangkin dikalsinasi juga memberi kesan
yang disebabkan oleh penukaran interaksi logam sokongan. Pada suhu
tindak balas 443 K, jumlah tekanan gas 3.0M MPa dan 0.1 g/mL pemangkin CZAZ,
pemilihan terhadap metanol berkurangan dengan peningkatan nisbah molar Cu/Zn,
dan nilai pemilihan maksimum adalah 93.9 terhasil pada nisbah molar 0.33.
Dengan masa tindak balas 3 jam, pemangkin dengan prestasi terbaik adalah CZAZ75
dengan nisbah molar 5 memberi hasil metanol 6.4%.
Kata kunci: Karbon dioksida; penghidrogenan;
sintesis metanol; tembaga; zink; zirconia
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*Pengarang untuk
surat-menyurat; email: maizats@utp.edu.my
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