Page 59 - 201810
P. 59

第 35 卷第 10 期                            精   细   化   工                                 Vol.35, No.10
             2018 年 10 月                             FINE CHEMICALS                                Oct.   2018


              催化与分离提纯技术
             Pd/SAPO-5 的制备及其在合成甲基正戊基酮中的应用



                                                                                       *
                                 王   强,王乃威,付睿峰,王忍青,江志东
                           (上海交通大学  化学化工学院,上海市绝缘与老化重点实验室,上海  200240)

                                                                                                     29
                 摘要:以三乙胺为模板剂,采用水热法制备了 Pd/SAPO-5 双功能催化剂,并用 H 2 -TPR,XRD,SEM,XRF, Si
                 MAS NMR 等手段对催化剂进行了表征。结果表明:钯的加入并不能改变分子筛的晶体结构;而不同的硅铝比
                 (SiO 2 与 Al 2 O 3 的物质的量比,下同)会导致 SAPO-5 分子筛晶体结构以及形貌上的差异。将所制备的催化剂用于
                 丙酮和丁醛气相一步法合成甲基正戊基酮(MAK)的反应中,考察了硅铝比、反应温度和金属负载量对催化活
                 性的影响,在 SAPO-5 分子筛结构完整的前提下,Pd/SAPO-5 催化活性随硅铝比的上升而增加。在硅铝比为 1.5、
                 反应温度 180  ℃、w(Pd)=0.25%时,MAK 的收率最高,可达 57.86%,并可运行 500 h 以上而不明显失活。
                 关键词:Pd/SAPO-5;双功能催化剂;硅铝比;一步合成;甲基正戊基酮;催化技术
                 中图分类号:TQ224.2      文献标识码:A     文章编号:1003-5214 (2018) 10-1667-06


                       Preparation of Pd/SAPO-5 Bifunctional Catalysts for One-step

                                         Synthesis of Methyl Amyl Ketone

                                                                                                 *
                        WANG Qiang, WANG Nai-wei, FU Rui-feng, WANG Ren-qing, JIANG Zhi-dong
                 (Shanghai Key Laboratory  of  Electric Insulation and Thermal  Aging, School of Chemistry and Chemical  Engineering,
                 Shanghai Jiao Tong University, Shanghai 200240, China)


                 Abstract: A series of Pd/SAPO-5 bifunctional catalysts were prepared through hydrothermal method by
                                                                                          29
                 using triethylamine as template and were characterized by H 2-TPR, XRD, SEM, XRF and  Si MAS NMR.
                 The results revealed that the doping of Pd didn't change the molecular sieve crystalline structure of SAPO-5,
                 while the alteration of molar ratio of SiO 2 to Al 2O 3 could induce the changes in crystalline structure and
                 morphology  of SAPO-5. Subsequently, the Pd/SAPO-5 bifunctional  catalysts  were applied for one-step
                 synthesis of methyl amyl ketone (MAK) from acetone and butyraldehyde. The influences of SiO 2/Al 2O 3
                 molar ratio, reaction temperature and amount of palladium loading on the catalytic activity of catalyst were
                 investigated. When the SAPO-5 crystalline structure kept intact, the activity of Pd/SAPO-5 increased with
                 increasing the SiO 2/Al 2O 3 molar ratio. When the SiO 2/Al 2O 3 molar ratio was 1.5, the reaction temperature
                 was 180  ℃, and the amount of Pd loading was 0.25%, the catalytic activity reached the best. The highest
                 yield of MAK was 57.86%. Moreover, the catalytic activity was rather stable under 500 h time-on-stream
                 test.
                 Key words: Pd/SAPO-5; bifunctional catalyst; SiO 2/Al 2O 3 molar ratio; one-step synthesis; methyl-amyl-
                 ketone; catalysis technology


                 甲基正戊基酮(methyl amyl ketone,MAK)又               应,生成中间产物羟酮;第二步是中间产物羟酮在
            名 2-庚酮,是一种环保型有机溶剂,广泛用于工业                           酸的催化下脱水生成 3-庚烯-2-酮;第三步是对烯酮
                                                [1]
            溶剂、医药、农药、香料和香精等领域 。目前国                             的双键选择性加氢,一般选用 Pd/C 作为催化剂,得
                                                                                      [2]
            内外现有 MAK 生产均采用液相反应体系,由丙酮                           到甲基正戊基酮(MAK) 。多步液相反应使用一
            和丁醛经过三步反应合成;第一步是丙酮和丁醛                              次性的酸或碱作为催化剂,经历多个反应和分离步
                                                                                                    [3]
            (BD)在酸或碱的催化条件下发生羟醛交叉缩合反                            骤,副反应多、得率低、污染重、成本高 。

                 收稿日期:2017-10-24;  定用日期:2018-02-26; DOI: 10.13550/j.jxhg.20170861
                 作者简介:王   强(1991—),男,硕士生。联系人:江志东(1967—),男,副教授,E-mail:zdjiang@sjtu.edu.cn,电话:021-34203107。
   54   55   56   57   58   59   60   61   62   63   64