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化工学报  2015 

载体对镍基催化剂顺酐液相加氢性能的影响

DOI: 10.11949/j.issn.0438-1157.20150020, PP. 2505-2513

Keywords: 加氢,催化剂,催化剂载体,,二氧化锆,二氧化硅,氧化铝

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Abstract:

分别以ZrO2、SiO2与Al2O3为载体,采用等体积浸渍法制备了Ni质量分数为15%的催化剂,考察了其催化顺酐液相加氢性能,并利用BET、XRD、H2-TPR以及TPO-MS等表征手段对催化剂进行了详细表征。结果表明,随载体不同各催化剂的加氢活性及选择性存在较大差异,Ni/Al2O3催化剂的C=C键加氢活性最高,但其几乎没有C=O加氢活性,催化顺酐加氢主产物为丁二酸酐。Ni/ZrO2催化剂具有最高的C=O加氢活性,催化顺酐加氢主产物为γ-丁内酯,在反应温度为483K,氢气压力为5MPa的条件下反应8h时,Ni/ZrO2催化剂的γ-丁内酯选择性达79.20%。催化剂的套用实验表明,Ni/ZrO2与Ni/SiO2催化剂具有高的使用稳定性,Ni/Al2O3催化剂则在套用过程中快速失活。顺酐加氢至γ-丁内酯的中间产物——丁二酸酐与催化剂间的相互作用是影响催化剂加氢选择性及使用稳定性的主要原因。

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