Effect of activated carbon on their performance as HT catalyst supports for fermentative hydrogen production
Keywords:Hydrotalcites, Supported materials, Nickle, Zinc, Hybrid catalysts
The activities of modified hydrotalcite with Ni and Zn catalysts supported on treated activated carbon (Ni-HT/TAC and Zn-HT/TAC) were investigated for their potential enhancement of fermentative hydrogen production. The experiments were performed under batch tests using sucrose-fed anaerobic mixed culture at 37 °C. The hybrid catalysts of Ni-HT/TAC and Zn-HT/TAC were synthesized by incipient impregnation methods. The X-ray powder diffraction patterns exhibit the characteristic diffractions of HT, indicating that the HTs were successfully coated onto TAC. The difference in dose of Ni-HT/TAC and Zn-HT/TAC showed a significant difference in hydrogen production over the studied range of 0.00-16.67 g/L. The maximum hydrogen yields obtained at 8.33 g/L of Ni-HT/TAC and Zn-HT/TAC were 2.66 and 3.08 mol H2/mol sucrose with 9.29% and 26.62% increment as compared to the control, respectively. In addition, the effect of modified hydrotalcite with Ni and Zn catalysts loading on TAC for fermentative hydrogen production were studied. The hydrogen production profiles showed that the initial activity of the Ni-HT/TAC catalyst at 24 h was more active than Zn-HT/TAC catalyst. On the contrary, after 120 h, the activity of the Zn-HT/TAC catalyst was more stable than Ni-HT/TAC catalyst. The maximum cumulative hydrogen production was obtained from Zn-HT/TAC with a 7.53% increment as compared to TAC. On the other hand, Ni-HT/TAC showed a decrease in the maximum cumulative hydrogen production with 7.18% as compared to TAC. Therefore, TAC showed the potential as modified HT catalyst supports, especially Zn metal for fermentative hydrogen production. However, an improvement in surface area of TAC was required for enhancing the activity of TAC as catalyst support material.
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