助剂类型对CO甲烷化Ni-Al2O3催化剂结构、性能和表面积碳的影响
胡小波 , 莫文龙 , 马亚亚 , 王锋 , 杨晓勤
现代化工 ›› 2025, Vol. 45 ›› Issue (S2) : 186 -191.
助剂类型对CO甲烷化Ni-Al2O3催化剂结构、性能和表面积碳的影响
Effect of promoters on structure,performance and carbon deposition of Ni-Al2O3 catalyst for CO methanation
采用机械化学法制备了Co、Fe、Ce、Zn等助剂改性的Ni-Al2O3催化剂,考察了助剂对Ni-Al2O3催化剂结构、CO甲烷化性能和表面积碳行为的影响。通过X射线衍射(XRD)、H2-程序升温还原(H2-TPR)、N2-低温物理吸附(BET)和热重分析(TG-DTG)等表征方法,对反应前后催化剂进行了组成、结构和表面特征解析。结果表明,负载Fe助剂可以促进催化剂活性组分Ni在载体Al2O3表面的分散,改善镍铝尖晶石NiAl2O4的存在形式,强化活性组分与载体的相互作用。该催化剂表现出更为优异的活性和选择性,其CO转化率、CH4选择性和CH4收率分别为96.03%、89.05%和82.6%。基于反应后催化剂的XRD分析和氧化性气氛下TG-DTG积碳烧失测试发现,负载Fe助剂的催化剂具有更好的抗烧结能力和抗积碳性能。
Mechanochemical method is utilized to prepare Ni-Al2O3 catalysts modified with Co,Fe,Ce and Zn promoters,respectively,and the impact of promoter on the structure,CO methanation performance,and surface carbon deposition of Ni-Al2O3 catalysts is investigated.The composition,structure,and surface characteristics of the catalysts before and after the reaction are analyzed by means of characterization methods such as X-ray diffraction (XRD),H2 temperature-programmed reduction (H2-TPR),N2 low-temperature physical adsorption (BET),and thermogravimetric analysis (TG-DTG).Results show that the loading of Fe promoter can promote active component Ni to disperse on the surface of the Al2O3 support,improving the existence form of nickel aluminum spinel (NiAl2O4),and enhancing the interaction between the active component and the support.This catalyst exhibits better activity and selectivity,with CO conversion,CH4 selectivity,and CH4 yield of 96.03%,89.05%,and 82.6%,respectively.Based on XRD analysis of the catalyst after reaction and TG-DTG carbon deposition loss test under oxidizing atmosphere,it is found that the catalyst modified with Fe promoter presents better anti-sintering ability and anti-carbon deposition performance.
CO甲烷化 / 积碳 / 助剂 / Ni-Al2O3催化剂
CO methanation / carbon deposition / promoter / Ni-Al2O3 catalyst
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中央引导地方科技发展专项(ZYYD2022C16)
新疆维吾尔自治区自然科学基金(2022D01C23)
昌吉州科技支撑产业高质量发展专项(2022Z04)
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