铜改性MoNi/γ-Al2O3催化剂的制备与表征
Preparation and characterization of Cu-modified MoNi/γ-Al2O3 catalyst
以纳米自组装法制备的大孔氧化铝为载体,铜为助剂,Mo、Ni为活性中心,分别选用70%柠檬酸(CA)、70%苹果酸(DL)以及70%酒石酸(TA)3种不同种类的络合剂和不同用量的Cu(NO3)2配制络合浸渍液,制备了2个系列催化剂。实验结果表明,Cu(NO3)2在浸渍液中的溶解度比较大。对制备的催化剂进行BET、XRD、H2-TPR和NH3-TPD等表征分析,结果表明,Mo∶Ni∶Cu的质量比为6∶1∶4、加入的络合剂为70%柠檬酸时,所制备的催化剂性能最好;所制备的催化剂均存在双峰孔结构,所含的酸以弱酸和中强酸为主;载体比表面积增大,催化剂酸性中心量增大,催化剂的活性提高。
Macroporous alumina prepared via nano self-assembly method is used as carrier,copper as assistant,Mo and Ni as active centers,two series of catalysts are prepared by using 70% citric acid (CA),70% malic acid (DL) and 70% tartaric acid (TA),respectively as complexing agent,and Cu(NO3)2 with different dosages as complexing impregnating solution.Experimental results show that the solubility of Cu(NO3)2 in the impregnation solution is relatively high.The catalysts prepared are characterized by means of BET,XRD,H2-TPR and NH3-TPD.It is shown that the catalyst prepared with a Mo∶Ni∶Cu mass ratio of 6∶1∶4 and with 70% citric acid as complexing agent has the best performance.There is a bimodal pore structure in all catalysts prepared.The acids contained in the catalysts are mainly weak acids and medium-strong acids.With the increasing specific surface area of the carrier,the amount of acid centers in the catalyst improves,which leads to a high activity of the catalyst.
Cu modification / catalyst / alumina carrier / active metal
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国家自然科学基金(21802061)
国家自然科学基金(21978125)
辽宁省教育厅科学技术研究(JYTMS20231440)
抚顺英才计划(FSYC202101001)
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