硝酸镍和亚磷酸混合物作前驱体制备Ni2P/Hβ加氢开环催化剂
Preparation of Ni2P/Hβ hydrogenative ring opening catalysts using mixtures of nickel nitrate and phosphorous acid as precursors
以Hβ沸石作载体,用浸渍法负载不同n(P)/n(Ni)的硝酸镍和亚磷酸混合物制备了Ni-P(y)/Hβ[y=n(P)/n(Ni)]催化剂的前驱体。采用程序升温还原这些前驱体的方法制备了Ni-P(y)/Hβ催化剂。以十氢萘作模型化合物,考察了催化剂的加氢开环性能。结果表明,还原硝酸镍和亚磷酸混合物前驱体时,能够以较低的n(P)/n(Ni)(0.6~0.7)在Hβ载体上制备纯相Ni2P。Ni-P(y)/Hβ催化剂表面富磷,并且前驱体中n(P)/n(Ni)基本不会影响催化剂表面n(P)/n(Ni)。其中,Ni-P(0.9)/Hβ催化剂表面Ni2P相含量最高,表明适当过量的P有利于Ni2P的生成。Hβ负载Ni2P后提高了Lewis酸的相对含量,其中Ni-P(0.9)/Hβ的强酸中心中Brönsted酸与Lewis酸分布较为均衡。Ni-P(0.9)/Hβ在十氢萘的加氢开环反应中表现出最高的活性和最佳的产物分布,是潜在的加氢开环催化剂,其良好的加氢开环性能可能与其最高的表面Ni2P含量以及均衡的强酸中心分布有关。
The precursors of Ni-P(y)/Hβ catalysts (y represents n(P)/n(Ni) ratio) were prepared by impregnating mixtures of Ni(NO3)2 and H3PO3 with different n(P)/n(Ni) ratios over a Hβ zeolite.The Ni-P(y)/Hβ catalysts were obtained by temperature-programmed reduction of these precursors.Their hydrogenative ring opening performance was evaluated using decalin as model compound.The results demonstrated that the minimum n(P)/n(Ni) ratio of the precursor required for the formation of phase-pure Ni2P supported on Hβ was between 0.6 and 0.7.The surfaces of the Ni-P(y)/Hβ catalysts were rich in phosphorus,and the surface n(P)/n(Ni) ratios were hardly affected by those of the precursors.The contents of Ni2P in the surface of Ni-P(0.9)/Hβ were the highest among the Ni-P(y)/Hβ catalysts studied,indicating that a moderate excess phosphorous favors the formation of Ni2P.The relative content of Lewis acid sites increased after the loading of Ni2P on Hβ,and a balanced distribution of Brönsted and Lewis acid sites was observed in the strong acid sites of Ni-P(0.9)/Hβ.Ni-P(0.9)/Hβ exhibited the highest activity and the optimal product distribution among the Ni-P(y)/Hβ catalysts,which make it a promising hydrogenative ring opening catalyst.This indicates that a moderate excess of phosphorous plays a positive role in enhancing the ring opening performance of Ni2P supported on Hβ.The superior ring opening performance of Ni-P(0.9)/Hβ can be attributed to its highest surface Ni2P content and the balanced distribution of strong acid sites.
硝酸镍 / 加氢开环 / 十氢萘 / 程序升温还原 / Hβ / Ni2P / 亚磷酸
Nickel nitrate / hydrogenative ring opening / decalin / temperature-programmed reduction / Hβ / Ni2P / phosphorous acid
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国家自然科学基金项目(21673029)
国家自然科学基金项目(22108207)
天津市自然科学基金重点项目(19JCZDJC31700)
重质油国家重点实验室开放基金项目(SKLHOP202202005)
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