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Catalytic conversion of methane and CO2 to synthesis gas over a La2O3-modified SiO2 supported Ni catalyst in fluidized-bed reactor |
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| Authors: | Jing Gao Zhaoyin Hou Jianzhong Guo Yinghong Zhu Xiaoming Zheng |
| Affiliation: | aInstitute of Catalysis, Department of Chemistry, Zhejiang University (Xixi Campus), Hangzhou 310028, China bDepartment of Chemistry, Zhejiang Forestry University, 311300 Lin’an, China cCollege of Chemical Engineering and Materials, Zhejiang University of Technology, Hangzhou 310012, China |
| Abstract: | In this contribution, a commercial spherical SiO2 was modified with different amounts of La2O3, and used as the support of Ni catalysts for autothermal reforming of methane in a fluidized-bed reactor. Nitrogen adsorption, XRD and H2-TPR analysis indicated that La2O3-modified SiO2 had higher surface area, strengthened interaction between Ni and support, and improved dispersion of Ni. CO2-TPD found that La2O3 increased the alkalescence of SiO2 and improved the activation of CO2. Coking reaction (via both temperature-programmed surface reaction of CH4 (CH4-TPSR) and pulse decomposition of CH4) disclosed that La2O3 reduced the dehydrogenation ability of Ni. CO2-TPO, O2-TPO (followed after CH4-TPSR) confirmed that only part amount of carbon species derived from methane decomposition could be removed by CO2, and O2 in feed played a crucial role for the gasification of the inactive surface carbons. Ni/xLa2O3-SiO2 (x = 10, 15, 30) possessed high activity and excellent stability for autothermal reforming of methane in a fluidized-bed reactor. |
| Keywords: | Autothermal reforming of methane Ni/La2O3-SiO2 catalysts Synthesis gas Fluidized-bed reactor |
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