采用水热法合成了小粒径、具有介孔结构的SAPO-11分子筛。采用浸渍法制备了不同Ni负载量的Ni/SAPO-11催化剂。并采用X射线衍射,扫描电镜, N2物理吸附-脱附, NH3程序升温脱附,热重和H2化学吸附技术对该类催化剂的物理化学性质进行了详细表征。结果表明, SAPO-11较大表面积和介孔结构可分散Ni,使得Ni粒子尺寸较小。在棕榈油加氢脱氧制备液体烃类燃料反应中,液体烷烃产物由相关脂肪酸中间产物的直接加氢脱氧和脱羰-加氢脱氧两种途径产生。 Ni/SAPO-11催化剂的弱/中强酸性质及其匹配的金属-酸双功能可显著抑制积炭反应,提高催化剂的寿命,液体烷烃收率高达70%,异构烷烃选择性超过80%。
Small particles of SAPO-11 with large surface area and mesoporosity were synthesized hydrother-mally. Ni/SAPO-11 catalysts with different Ni loadings were prepared by incipient wetness im-pregnation, and their physicochemical properties were characterized by X-ray diffraction, scanning electron microscopy, N2 adsorption-desorption, NH3 temperature-programmed desorption, Ther-mogravimetric, and H2 chemisorption. In the Ni impregnation of SAPO-11, the mesopores of SAPO-11 accommodated the Ni particles and give good dispersions, but with the partial blocking of some micropores. In the hydrodeoxygenation of palm oil, the production of liquid alkanes depends on the competition between hydrodeoxygenation and decarbonylation pathways via the corre-sponding carboxylic acid intermediates. The weak and medium acidity of SAPO-11 and a good match of the Ni and SAPO-11 functions in the Ni/SAPO-11 catalysts decreased the cracking of pri-mary long chain alkanes and gave a high liquid alkane yield of 70 wt%and isomerization selectivity of>80 mol%.
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