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A core–shell-like encapsulated catalyst was designed where Pd–Co/activated carbon (A.C.) catalyst was enwrapped by silicalite-1 zeolite membrane, which greatly improved normal to iso ratio of aldehyde products during hydroformylation of 1-hexene with syngas (CO + H2), due to its spatial confined structure and shape selective property derived from zeolite membrane.
The NOx storage catalyst Pt/BaAl2O4-Al2O3 was prepared by a coprecipitation--impregnation method. For fresh sample, the barium mainly exists as the BaAl2O4 phase except for some BaCO3 phase. The BaAl2O4 phase is the primary NOx storage phase of the sample. EXAFS and TPD were used for investigating the mechanism of NOx storage. It is found that two kinds of Pt sites are likely to operate. Site...
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