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用磷酸溶液(H3PO4)对活性炭载体(AC)进行预处理,以此为载体,采用浸渍法制备了负载型钯(Pd)催化剂(PACT)并将其应用于乙炔氢氯化反应.结果表明,与未进行处理活性炭载体负载Pd催化剂(PAC)相比,催化剂PACT表现出较高的催化剂活性.对催化剂进行了比表面积(BET),Boehm滴定,X-射线粉末衍射(XRD),透射电镜(TEM),电子能谱(EDS)等表征.结果表明,载体表面含氧基团含量的变化,活性组分Pd含量的富集以及由H3PO4引进的PO3-4的存在是催化剂具高活性的主要原因.热重分析(TG)说明,反应过程积碳的产生使得催化剂的活性降低.
Activated carbon support (AC) was pretreated with phosphoric acid solution (H3PO4) as a carrier, and supported palladium catalyst (PACT) was prepared by impregnation method and applied to acetylene hydrochlorination. The catalyst PACT showed higher catalytic activity than the activated carbon supported Pd catalyst (PAC). The catalysts were characterized by BET, Boehm titration, X-ray powder diffraction (XRD), transmission electron microscopy TEM, EDS, etc. The results show that the change of the content of oxygen-containing groups on the surface of the support, the enrichment of the Pd content of the active component, and the presence of PO3-4 introduced by H3PO4 are the main catalysts with high activity The reason of TG (Thermal Gravimetric Analysis) shows that the carbon deposition in the reaction process decreases the activity of the catalyst.