Stability studies of PtSn structured catalysts supported on thin layers of MAl2O4 (M: Mg, or Zn) for paraffins dehydrogenation reactions

被引:1
|
作者
Ballarini, Adriana [1 ]
Zgolicz, Patricia [1 ]
de Miguel, Sergio [1 ]
Bocanegra, Sonia [1 ]
机构
[1] Univ Nac Litoral, CCT Santa Fe, Inst Invest Catalisis & Petroquim Ing Jose Miguel, CONICET,Fac Ingn Quim, Santa Fe, Argentina
来源
CANADIAN JOURNAL OF CHEMICAL ENGINEERING | 2023年 / 101卷 / 01期
关键词
catalytic stability; MgAl2O4; n-butane dehydrogenation; PtSn structured catalysts; ZnAl2O4; N-BUTANE DEHYDROGENATION; OXIDATIVE DEHYDROGENATION; PROPANE DEHYDROGENATION; TRIMETALLIC CATALYSTS; PERFORMANCE; REACTOR; DEPOSITION; COATINGS; ETHANE; MGAL2O4;
D O I
10.1002/cjce.24370
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
In order to determine the catalytic stability, PtSn structured catalysts supported on thin films of MgAl2O4 or ZnAl2O4 deposited on alpha-Al2O3 spheres were studied through five reaction-regeneration cycles in the n-butane dehydrogenation. Bimetallic catalysts show good catalytic stability along the five reaction-regeneration cycles. Among the different synthesized catalysts, the PtSn/Sp-Zn-CN catalyst showed the best catalytic behaviour, showing very good values of yields to butenes and excellent catalytic stability along the cycles, even better than the one of a structured commercial catalyst used industrially for the dehydrogenation of paraffins. The characterization results by temperature-programmed reduction and X-ray photoelectron spectroscopy showed some modifications in the metallic phase of the catalysts after the cycles, mainly in the Sn/Pt surface ratios and in segregation effects in some catalysts. However, the transmission electron microscopy (TEM) results are conclusive in the sense that, after the cycles, the bimetallic catalysts maintained a very high proportion of particles with sizes between 1-2 nm, and therefore, preserved a high metallic dispersion.
引用
收藏
页码:431 / 443
页数:13
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