Effect of MoO3 on Structures and Properties of Ni-SiO2 Methanation Catalysts Prepared by the Hydrothermal Synthesis Method

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• 作者：Jiaying Zhang ; Zhong Xin ; Xin Meng ; Yuhao Lv ; Miao Tao
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：October 16, 2013
• 年：2013
• 卷：52
• 期：41
• 页码：14533-14544
• 全文大小：826K
• 年卷期：v.52,no.41(October 16, 2013)
• ISSN：1520-5045

文摘

Several nickel-incorporated SiO₂ catalysts with MoO₃ molar content in range of 0.5% to 5.0% were prepared by the hydrothermal synthesis method and investigated for synthetic natural gas (SNG) production in a continuous flow fixed-bed reactor. MoO₃ can significantly improve the activity of Ni-SiO₂ due to electron transfer from MoO₃ to Ni species, while excessive MoO₃ (>3.0%) will reduce the catalyst activity due to partial coverage of active metal by MoO₃ and formation of Ni鈥揗o alloy. Ni-0.5%Mo-SiO₂ achieves the best activity with 100% CO conversion and 99% CH₄ yield at 400 掳C, 2.0 MPa, and 12000 mL/g/h. The results of thermogravimetry (TG) and temperature-programming reduction (TPR) show that MoO₃ can inhibit carbon deposition of Ni-SiO₂ and excessive MoO₃ (>1.0%) will weaken the interaction between metallic nickel and the support. The results of XRD, TPR, and TG show that catalyst sintering rather than carbon deposition leads to catalyst deactivation in catalytic stability and thermal stability tests.