通过改变微、介孔模板剂的摩尔比合成不同孔分布的多级孔ZSM-5分子筛,并采用等体积共浸渍法制备了多级孔ZSM-5分子筛负载Pt-Ni双金属催化剂,系统研究了分子筛载体中不同微、介孔分布对愈创木酚和二苯并呋喃二元混合物加氢脱氧制备环烷烃的影响。利用X射线晶体衍射(XRD)、氮气吸脱附(N₂-BET)、场发射扫描电子显微镜(SEM)和场发射透射电子显微镜(TEM)对Pt-Ni催化剂的形貌和结构进行了表征。结果表明,不加入微孔模板剂时,合成的分子筛为无定形形貌,随着微孔模板剂摩尔分数的增加,分子筛的结晶度逐渐提高且介孔体积逐渐减小;当微、介孔模板剂摩尔比为15∶5时,Pt-Ni催化剂表现出最佳的联环己烷选择性。

Hierarchical ZSM-5 zeolite with different pore distributions are synthesized via changing the ratio of microporous and mesoporous template agent.Hierarchical ZSM-5 supported Pt-Ni bimetallic catalyst is prepared via incipient-wetness co-impregnation method.The influence of different micro- and mesoporous distributions in zeolite carrier on the hydrodeoxygenation of guaiacol and dibenzofuran to naphthenes over the prepared catalysts is systematically studied.The morphology and structure of the Pt-Ni catalysts are analyzed in detail by X-ray crystal diffraction (XRD),nitrogen adsorption and desorption (N₂-BET),field emission scanning electron microscope (SEM) and field emission transmission electron microscope (TEM).It is indicated that the zeolite synthesized without adding microporous template has an amorphous morphology.As the content of microporous template increases,the crystallinity of zeolite increases gradually and the mesopore volume decreases gradually.When the ratio of microporous template to mesoporous template is 15:5,the prepared Pt-Ni catalyst exhibits superior bicyclohexane selectivity.

马北冰(1981-),男,本科,工程师,研究方向为油品加工,121436660@qq.com