Selective hydrogenation of maleic anhydride
145
are suitable for sequential production, and the distribu-
tion of products is stable. To examine the stability of
the catalyst in fixed bed systems, the catalytic perfor-
mance of CD-Pd/Al2O3 in a fixed bed was investigated
at 373 K and 0.2 MPa (figure 5). The CD-Pd/Al2O3
catalyst showed excellent catalytic performance in the
hydrogenation of MA in a fixed bed system, and both
the MA conversion and SA selectivity were greater than
98%. What need to notice was that deactivation was not
observed when the reaction was carried out for 1600 h,
The ICP results revealed that the Pd loading did not
have obviously change after reaction for 1600 h, indi-
cating that the Pd species were not leaching the support.
So, it can be stated that CD-Pd/Al2O3 catalyst was a
highly stable catalyst for this reaction at this condition.
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4. Conclusions
Pd/Al2O3 catalysts prepared by the colloid depo-
sition method showed remarkable catalytic perfor-
mance in the selective hydrogenation of MA to SA in
batch and fixed bed systems and showed significantly
higher activity than Pd/Al2O3 catalysts prepared by
the impregnation method. When the reaction was car-
ried out on Pd/Al2O3 catalysts prepared by the col-
loid deposition method in 1,4-dioxane at 353 K and
1.0 MPa of H2 pressure, the conversion and SA selec-
tivity were greater than 99% after 5 h. The catalyst also
showed excellent performance in solvent-free batch
systems and fixed bed systems. Moreover, the MA con-
version did not decrease significantly after 1600 h in a
fixed bed system. These results demonstrated that CD-
Pd/Al2O3 catalysts prepared by the colloid deposition
method are high-performance catalysts for the selective
hydrogenation of MA to SA.
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3414
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This work was supported by the Technology Institute
of Shanghai Huayi (Group) Company, Natural Science
Foundation of Science and Technology Department of
Jilin Province (20130101015JC), the Innovation Project
of Frontiers of Science and New Interdiscipline of Jilin
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Wada Y J 2007 Catal. Commun. 8 193
University (2012), the open subject of State Key Labo- 28. Li K-T, Hsu M-H and Wang I 2008 Catal. Commun.
9 2257
ratory of Inorganic Synthesis and Preparative Chem-
istry (2012–15) and the National Science Foundation of
China (Grant NO. 20973080).
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