The performances of Ni–MgO@γ-Al2O3 for steam methane reforming prepared by freeze-drying technology
The performances of Ni–MgO@γ-Al2O3 for steam methane reforming prepared by freeze-drying technology
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DOI：
10.1016/j.ijhydene.2024.02.049
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发表时间：
2024-03
影响因子：
7.2
通讯作者：
Yanhui Li;Shengwu Huang;Bingwen Lu;Zhaoyang Deng;Dongdong Dong;Xinyue Zhang;Shanghua Wu;Xin Deng
中科院分区：
文献类型：
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作者：
Yanhui Li;Shengwu Huang;Bingwen Lu;Zhaoyang Deng;Dongdong Dong;Xinyue Zhang;Shanghua Wu;Xin Deng
镍基催化剂是甲烷重整不可缺少的重要组成部分，但在重整温度较高时，由于焦炭的沉积和烧结，催化剂会发生失活。本文采用共浸渍和冷冻干燥法制备了镍基催化剂，并用XRD、TEM和H2-TPR对催化剂进行了表征。考察了冷冻干燥方式和MgO对ch4转化率、h2收率和CO选择性的影响。结果表明，冻干方法的应用促进了Ni颗粒在γ- al2o3载体表面的分散。此外，MgO的加入进一步增强了Ni的分散性，抑制了催化剂的粒径。在所制备的催化剂中，0.05MgO-Ni /γ- al2o3催化剂的催化性能最好。在S/C比为2、重整温度为600℃条件下，反应10 h后ch4转化率、h2收率和CO选择性分别超过75%、55%和90%。
Ni-based catalysts are an indispensable part for methane reforming, but the catalyst deactivation occurs at high reforming temperatures due to coke deposition and sintering. In this work, co-impregnation and freeze drying method was developed to prepare the Ni-based catalyst which were characterized by XRD, TEM and H2-TPR. And the effects of freeze drying method and MgO on CH4conversion, H2yield and CO selectivity were investigated. The results revealed that the application of the freeze-drying method promoted the dispersion of Ni particles on the surface of γ-Al2O3support. Moreover, the inclusion of MgO further enhanced Ni dispersion and suppressed the particle size of the catalysts. Among the prepared catalysts, the 0.05MgO–Ni/γ-Al2O3catalyst showed the best catalytic performance. CH4conversion, H2yield and CO selectivity respectively exceeded 75%, 55% and 90% under the conditions of an S/C ratio of 2 and reforming temperature of 600 °C after 10 h.