氮化SBA-15负载高分散过渡金属用于丙烷高效直接脱氢
收稿日期: 2022-05-23
网络出版日期: 2023-02-16
Nitriding SBA-15 loaded highly dispersed transition metals for efficient direct dehydrogenation of propane
Received date: 2022-05-23
Online published: 2023-02-16
以氮化法修饰的介孔二氧化硅（SBA-15）为载体，采用浸渍法制备了不同过渡金属（钴、镍、铁、铜）脱氢催化剂。通过X射线衍射光谱和N2吸附-脱附分析表明氮化后的载体仍能保持良好的介孔结构；通过扫描电子显微镜分析表明金属处于高度分散的良好状态；通过程序升温还原和X射线光电子能谱分析表明氮化SBA-15改变了金属的电子结构，增强了载体与金属之间的相互作用力。采用定量浸渍法制备了金属负载量为1%（质量分数）的脱氢催化剂，并进行了性能评价。结果表明，丙烷脱氢催化剂活性顺序由高到低依次为Co-SBA-15N900-1%、Fe-SBA-15N900-1%、Cu-SBA-15N900-1%、Ni-SBA-15N900-1%，其中Co-SBA-15N900-1%催化剂的丙烷转化率为33%，丙烯选择性为88%。
李海涛 , 赵银峰 . 氮化SBA-15负载高分散过渡金属用于丙烷高效直接脱氢[J]. 无机盐工业, 2023 , 55(2) : 141 -148 . DOI: 10.19964/j.issn.1006-4990.2022-0316
Dehydrogenation catalysts with different transition metals of Co，Ni，Fe，Cu were prepared by impregnation method with SBA-15 modified by nitridation method as carrier.The mesoporous structure of the support after nitridation was confirmed by X-ray diffraction（XRD） and N2 adsorption desorption analysis.Scanning electron microscopy（SEM） confirmed that the metal was in a good state of high dispersion.Temperature programmed reduction（H2-TPR） and X-ray photoelectron spectroscopy（XPS） proved that nitriding SBA-15 changed the electronic structure of the metal，and the interaction between the carrier and the metal was significantly enhanced.Metal-loaded samples with a content of 1% were prepared by quantitative impregnation method，and their properties were evaluated.The experimental results showed that the order of catalytic PDH activity of different metals for propane dehydrogenation was Co-SBA-15N900-1%，Fe-SBA-15N900-1%，Cu-SBA-15N900-1%，Ni-SBA-15N900-1%.The Co-SBA-15N900-1% exhibited a propane conversion of 33% and a propylene selectivity of 88%，indicating its promising utilization in industry.
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