CAJ | 학술논문

利用同源氧化锌有利于ZIF-8结构的成核生长原理，采用粒径为1～2 mm的负载型Pd/Al2O3微球作为核、ZIF-8膜作为外壳，ZnO诱导生长制备了Pd/Al2O3@ZIF-8核壳催化剂，用XRD、EDX、SEM、ICP等分析手段对其结构进行了表征，并采用不同大小分子烯烃加氢反应对其壳层连续完整性进行了性能测试。结果表明，Pd/Al2O3微球表面预先引入的ZnO纳米粒子层对外层连续ZIF-8膜壳层的形成，起到了很好的成核生长点和连接点的作用，诱导合成了连续完整的ZIF-8膜包覆的Pd/Al2O3@ZIF-8核壳结构材料，ZIF-8膜层的厚度可通过ZIF-8合成的次数进行调变。该Pd/Al2O3@ZIF-8核壳催化剂对不同分子大小的烯烃加氢反应表现出明显的筛分选择性，并对外加苯并噻唑作为毒物分子的反应体系具有良好的抗中毒性能和防催化活性金属Pd组分流失的功能。
이용동원양화자유리우ZIF-8결구적성핵생장원리，채용립경위1～2 mm적부재형Pd/Al2O3미구작위핵、ZIF-8막작위외각，ZnO유도생장제비료Pd/Al2O3@ZIF-8핵각최화제，용XRD、EDX、SEM、ICP등분석수단대기결구진행료표정，병채용불동대소분자희경가경반응대기각층련속완정성진행료성능측시。결과표명，Pd/Al2O3미구표면예선인입적ZnO납미입자층대외층련속ZIF-8막각층적형성，기도료흔호적성핵생장점화련접점적작용，유도합성료련속완정적ZIF-8막포복적Pd/Al2O3@ZIF-8핵각결구재료，ZIF-8막층적후도가통과ZIF-8합성적차수진행조변。해Pd/Al2O3@ZIF-8핵각최화제대불동분자대소적희경가경반응표현출명현적사분선택성，병대외가분병새서작위독물분자적반응체계구유량호적항중독성능화방최화활성금속Pd조분류실적공능。
A novel Pd/Al2O3@ZIF-8 core-shell catalyst was successfully prepared by ZnO-induced coating of a layer of ZIF-8 shell over the Pd/Al2O3 bead with a mean diameter of 1—2 mm. The obtained Pd/Al2O3@ZIF-8 core-shell catalyst was characterized by XRD, EDX, SEM and ICP analysis techniques, and employed as catalyst for the liquid-phase hydrogenation of alkenes. It was found that the introduction of ZnO layer and subsequent pretreatment of the ZnO layer played vital roles in the formation of continuous and compact ZIF-8 shell. Furthermore, the thickness of the ZIF-8 shell could be tuned by altering the assembly cycles of ZIF-8. Results of the catalytic reactions showed that the Pd/Al2O3@ZIF-8 catalyst exhibited better size-selectivity, poison-resistance and leaching-proof properties in contrast to the naked Pd/Al2O3 catalyst.