1,2-环己二醇脱氢制邻苯二酚镍基催化剂的研究.pdfVIP

学兔兔 石 油 化 工 · 146· PETROCHEMICAL TECHNoLoGY 2010年第39卷第2期 1，2一环己二醇脱氢制邻苯二酚镍基催化剂的研究 裴松鹏，林 陵，曾崇余 (南京工业大学 化学化工学院，江苏 南京 210009) [摘要]以硝酸镍为镍源，分别以硅藻土、活性炭、MgO和，一AI2O3为载体，采用均相沉淀法与等体积浸渍法制备了负载型镍基 催化剂，考察了所制备的催化剂对1，2一环己二醇脱氢制邻苯二酚反应的活性和选择性，并对催化剂进行了BET，XRD，SEM等表 征。实验结果表明，催化剂的比表面积与脱氢活性无对应关系，但平均孔径大有利于提高邻苯二酚的选择性；沉淀剂影响催化剂 的微孔结构和粒径分布。以硅藻土为载体、NH3·H20+Nil HCO 为沉淀剂制备的镍基催化剂，镍物种的晶粒度小、分散度较 高，催化剂的平均孔径大，表现出良好的活性和选择性，在320℃、101 kPa、液态空速2．6 h_。、N，流量30mL／min、，z(1，2一环己二 醇)：n(H2O)=1：4的条件下，1，2一环己二醇的转化率达到98．3％，邻苯二酚的选择性为85．2％。 [关键词]镍基催化剂；载体；1，2一环己二醇；脱氢；邻苯二酚 [文章编号]1000—8144(2010)02—0146—05 [中图分类号]TQ 203．2 [文献标识码]A Ni-Based Catalysts for Dehydrogenation of 1．2·Cyclohexandiol to Catechol Pei Songpeng，Lin Ling，Zeng Chongyu (College of Chemistry and Chemical Engineering，Nanjing University of Technology，Nanjing Jiangsu 210009，China) [Abstract]Supported nickel—based catalysts were prepared through homogeneous precipitation method or isochoric impregnation method using nickel nitrate as nickel source，and kieselguhr ，activated carbon， MgO，or —AI2 O3 as supports．These catalysts were characterized by means of BET，XRD and SEM． Their properties in dehydrogenation of 1，2一cyclohexandiol to catechol was evaluated in a fixed—bed reactor．Results showed that activities of the nickel—based catalysts were not associated witl1 their specific surface areas，but selectivity to catechol was obviously enhanced by the catalyst with large average pore diameter．Effects of precipitant type on pore structures and particle dispersions of the catalysts were significant．Dispersity of active nickel sp