文献类型：期刊文献

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

作者：Zhang, Jiaying[1];Xin, Zhong[1];Meng, Xin[1];Lv, Yuhao[1];Tao, Miao[1]

机构：[1]E China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2013

卷号：52

期号：41

起止页码：14533

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20134416908046);WOS:【SCI-EXPANDED(收录号:WOS:000326125700004)】；

基金：This research was financially supported by National Natural Science Funds of China (NSFC, Grant No. U1203293).

语种：英文

外文关键词：Catalyst activity - Catalyst deactivation - Carbon - Molybdenum oxide - Thermogravimetric analysis - Nickel alloys - Hydrothermal synthesis - Silica - Chemical reactors - Metals - Binary alloys - Deposition

摘要：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-Mo alloy. Ni-0.5%Mo-SiO2 achieves the best activity with 100% CO conversion and similar to 99% CH4 yield at 400 degrees 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.