Influence of ZrO2 Loading on SBA-15-Supported Cobalt Catalysts for Fischer−Tropsch Synthesis

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• 作者：Shifang Mu ; Debao Li ; Bo Hou ; Lihong Jia ; Jiangang Chen ; Yuhan Sun
• 刊名：Energy & Fuels
• 出版年：2010
• 出版时间：July 15, 2010
• 年：2010
• 卷：24
• 期：7
• 页码：3715-3718
• 全文大小：745K
• 年卷期：v.24,no.7(July 15, 2010)
• ISSN：1520-5029

文摘

The effect of ZrO₂ loading on SBA-15-supported cobalt Fischer−Tropsch catalysts was investigated by means of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR), NH₃-temperature-programmed desorption (TPD), and CO hydrogenation. Zirconia was first impregnated into SBA-15 to produce Zr-modified SBA-15 supports, following impregnation of Co. The final catalysts contained Zr content from 0 to 20 wt %. It was found that the promotion of ZrO₂ increased the cobalt dispersion, but the Co−Si interaction was gradually replaced by the Co−Zr interaction, which led to a decrease in the reduction degree (<400 °C) of cobalt species. As a result, both CO conversion and C₅⁺ selectivity showed a maximum with appropriate ZrO₂ content. Furthermore, C₅−C₁₁ hydrocarbon selectivity increased with the rise of ZrO₂ content.