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第 35 卷第 9 期                             精   细   化   工                                  Vol.35, No.9
             201 8 年 9 月                             FINE CHEMICALS                                 Sept.  2018


              催化与分离提纯技术
                  自组装低负载量 Pd/γ-Al O 催化剂催化氧化甲苯
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                                                                                 *
                                       李   奔,周   贝,李思汉,严新焕
                          (浙江工业大学  绿色化学合成技术国家重点实验室培育基地,浙江  杭州  310014)


                 摘要:以 PdCl 2 和 Pd 2 (dba) 3 〔三(二亚苄基丙酮)二钯〕为前驱体,通过浸渍法、沉积沉淀法和自组装法分别
                 制备了负载量(质量分数,下同)为 0.03%的 Pd/γ-Al 2 O 3 -IM、Pd/γ-Al 2 O 3 -DP 和 Pd/γ-Al 2 O 3 -SA 催化剂用于催化
                 氧化甲苯。在甲苯体积分数为 0.1%、空速(SV)为 18000 mL/(g·h)条件下,Pd/γ-Al 2 O 3 -SA 催化剂上甲苯实现
                 98%转化率的温度(T 98 )为 220 ℃,比 Pd/γ-Al 2 O 3 -DP 和 Pd/γ-Al 2 O 3 -IM 分别降低了 40 和 75 ℃。通过 N 2 吸附-
                 脱附、XRD、TEM、XPS 和 H 2 -TPR 对催化剂进行了表征。结果表明:自组装法制备的 Pd/γ-Al 2 O 3 -SA 催化剂的
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                 比表面积(345 m /g)和孔体积(0.52 cm /g)最大,Pd 纳米粒子(Pd NPs)平均粒径最小(5.0 nm),活性物种
                 主要以 PdO 的形式高度分散于载体 γ-Al 2 O 3 表面。此外,PdO 与载体 γ-Al 2 O 3 之间的强相互作用(SMSI)促进了其
                 催化氧化甲苯的活性。
                 关键词:自组装;Pd/γ-Al 2 O 3 ;催化氧化;甲苯;挥发性有机物;催化技术
                 中图分类号:O643;X13;X51      文献标识码:A     文章编号:1003-5214 (2018) 09-1555-07



                         A Self-assembled Pd/γ-Al 2O 3 Catalyst with Low Loading for
                                          Catalytic Oxidation of Toluene


                                                                                 *
                                        LI Ben, ZHOU Bei, LI Si-han, YAN Xin-huan
                 (State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology,
                 Hangzhou 310014, Zhejiang, China)

                 Abstract: Pd/γ-Al 2O 3-IM, Pd/γ-Al 2O 3-DP and  Pd/γ-Al 2O 3-SA catalysts with  0.03%  (mass fraction) Pd
                 loading for  catalytic oxidation  of toluene  were respectively  prepared  by the impregnation,
                 deposition-precipition, and self-assembly methods  using PdCl 2 and Pd 2(dba) 3 as  precursors. The
                 temperature for conversion  of  98% toluene  (T 98) over  Pd/γ-Al 2O 3-SA catalyst was  220 ℃ under the
                 conditions of toluene volume fraction at 0.1% and space velocity (SV) at 18000 mL/(g·h), which was 40
                 and 75 ℃  lower than those of Pd/γ-Al 2O 3- DP and Pd/γ-Al 2O 3-IM. The catalysts were characterized by N 2
                 adsorption-desorption, XRD, TEM, XPS, H 2-TPR. The results indicated that Pd/γ-Al 2O 3-SA catalyst
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                 possessed the largest specific surface area (345 m /g) and pore volume (0.52 cm /g), the smallest average
                 diameter (5.0 nm) of Pd nanopaticles (NPs), and the main active PdO species were well-dispersed on the
                 surface of  the  γ-Al 2O 3 support. Besides, the strong metal-support interaction  (SMSI) between  PdO and
                 γ-Al 2O 3 promoted its performance in catalytic oxidation of toluene.
                 Key words: self-assembly; Pd/γ-Al 2O 3; catalytic oxidation; toluene; VOCs; catalysis technology
                 Foundation items:  Plan Projects of  Science  & Technology in Zhejiang  Province (2016C31104); the
                 National Key R&D Program of China (2017YFC0210900).


                 工业和运输过程中排放的挥发性有机化合物                           气污染的主要成分之一          [1-2] 。催化氧化法是目前处理
            (VOCs)是颗粒物(PM)和光化学烟雾的主要成                           VOCs 最为经济有效的方式之一            [3-4] ,而研究与开发
            因,因其通常具有恶臭味及毒性而被认为是造成空                             相关催化剂是该技术的核心,并已成为环境催化研


                 收稿日期:2017-10-07;  定用日期:2018-02-01; DOI: 10.13550/j.jxhg.20170802
                 基金项目:浙江省科技计划项目(2016C31104);国家重点研发计划(2017YFC0210900)
                 作者简介:李   奔(1991—),男,硕士生。联系人:严新焕,教授,电话:0571-88320791,E-mail:xinhuanyan139@hotmail.com。
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