| 还原温度对Mo基催化剂物相及其加氢脱氧性能的影响 |
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| 引用本文： | 梁俊梅,陈宇,丁冉冉,孟永强,王要武,杨明德,吴玉龙. 还原温度对Mo基催化剂物相及其加氢脱氧性能的影响[J]. 化工进展, 2016, 35(5): 1452-1459. DOI: 10.16085/j.issn.1000-6613.2016.05.027 |
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| 作者姓名： | 梁俊梅 陈宇 丁冉冉 孟永强 王要武 杨明德 吴玉龙 |
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| 作者单位： | 1. 河北科技大学材料科学与工程学院, 河北 石家庄 050018;2. 清华大学核能与新能源技术研究院, 北京 100084 |
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| 基金项目： | 国家自然科学基金(21376140,21576155)及广东省科技计划(2015B020215004)项目。 |
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| 摘 要： | 以碳纳米管(CNTs)为载体,通过控制催化剂合成的还原温度制备了一系列负载型Mo基催化剂。采用XRD、TEM、N2物理吸附、XPS以及NH3/H2-TPD等技术对催化剂进行了表征,并研究了Mo基催化剂对硬脂酸催化加氢脱氧性能的影响。结果表明:随着还原温度的升高,催化剂表面的Mo物种逐渐被还原,还原过程为:MoO3→MoO2→Mo→Mo2C。还原温度为450℃和550℃时,催化剂的活性相为MoO2;还原温度为600℃时,催化剂的活性相为MoO2/Mo/β-Mo2C的混合相;还原温度为650℃和700℃时,催化剂的活性相全部转化为β-Mo2C。与活性相MoO2催化剂相比,β-Mo2C催化剂具有更高的加氢脱氧活性。此外,还原温度为600℃的MoO2/Mo/β-Mo2C混合相催化剂因具有较大的比表面积、较多的酸中心数量和较强的H2吸附能力,使得该催化剂在硬脂酸加氢脱氧反应中表现出最优越的催化活性。
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| 关 键 词： | Mo基催化剂 还原 加氢 活性 |
| 收稿时间： | 2015-08-17 |
Effect of reduction temperature on Mo-based catalyst phase and its activity in hydrodeoxygenation reaction |
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| LIANG Junmei,CHEN Yu,DING Ranran,MENG Yongqiang,WANG Yaowu,YANG Mingde,WU Yulong. Effect of reduction temperature on Mo-based catalyst phase and its activity in hydrodeoxygenation reaction[J]. Chemical Industry and Engineering Progress, 2016, 35(5): 1452-1459. DOI: 10.16085/j.issn.1000-6613.2016.05.027 |
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| Authors: | LIANG Junmei CHEN Yu DING Ranran MENG Yongqiang WANG Yaowu YANG Mingde WU Yulong |
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| Affiliation: | 1. College of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China;2. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China |
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| Abstract: | A series of Mo-based catalysts supported over CNTs were successfully prepared by controlling the reduction temperature during the catalyst synthesis. The properties of the obtained catalysts were systematically characterized by XRD, TEM, N2 adsorption, XPS and NH3/H2-TPD techniques, and the catalytic reactivity for the hydrodeoxygenation of stearic acid was evaluated. The results showed that Mo species on the surface of catalysts were reduced with the increase of reduction temperature, and the reduction process was as followed: MoO3→MoO2→Mo→Mo2C. The active phase was MoO2when reduction temperature was below 550℃. Further elevating the reduction temperature to 600℃, we found a mixed phase of MoO2/Mo/β-Mo2C existed. β-Mo2C was the main active phase when reduction temperature was over 650℃, and it exhibited higher activity of hydrodeoxygenation than the active phase of MoO2. In addition, the MoO2/Mo/β-Mo2C mixed phase catalyst at 600℃ showed the highest catalytic reactivity in hydrodeoxygenation of stearic acid due to its large specific surface area, more acid sites and stronger H2 adsorption ability. |
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| Keywords: | Mo-based catalyst reduction hydrogenation reactivity |
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