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Carbon dioxide reforming of methane over Ni-Co catalysts supported on Al2O3-HY zeolite |
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| รหัสดีโอไอ | |
| Title | Carbon dioxide reforming of methane over Ni-Co catalysts supported on Al2O3-HY zeolite |
| Creator | Tipanate Chaovanich |
| Contributor | Suphot Phatanasri |
| Publisher | Chulalongkorn University |
| Publication Year | 2558 |
| Keyword | Catalytic reforming, Cobalt catalysts, Nickel catalysts, Methane, รีฟอร์มมิงด้วยตัวเร่งปฏิกิริยา, ตัวเร่งปฏิกิริยาโคบอลต์, ตัวเร่งปฏิกิริยานิกเกิล, มีเทน |
| Abstract | In this research, the effect of Si/Al molar ratios (15, 200 and 500) of HY zeolite in bimetallic Ni-Co over Al2O3-HY zeolite catalysts prepared by incipient wetness impregnation method was studied. In addition, the effect of support ratios of Al2O3 and selected HY zeolite in bimetallic Ni-Co catalysts was investigated as follows: 3:1, 1:1 and 1:3, and compared to the Al2O3 support and HY zeolite support in Ni-Co catalysts. All catalysts were tested in carbon dioxide reforming of methane reaction at 700 ◦C of reaction temperature under atmospheric pressure and characterized by various techniques. From the results, it was found that Si/Al molar ratios of HY zeolite and support ratio of Al2O3 and HY zeolite affect catalytic activity in carbon dioxide reforming of methane, evidenced by characterization results. Among all catalysts, HY zeolite with Si/Al molar ratios of 500 in bimetallic Ni-Co over mixed Al2O3-HY500 with a support ratio of 1:3 exhibited the highest CH4 and CO2 conversions and H2 selectivity, and lowest CO selectivity. The best catalytic performance was resulted by the highest metal dispersion which are highest amount of Ni and Co active sites, a lower total acidity leading to greater affinity for CO2 adsorption, a shift of reduction temperature to lower temperature which are easy reducibility for metal and high stability in spite of highest carbon deposition. |
| URL Website | cuir.car.chula.ac.th |
