Effect of Reductive Treatment Duration on the Structure and Properties of Pd-Zn/C Catalysts for Liquid-Phase Acetylene Hydrogenation

被引：6
|
作者：
Glyzdova, Daria, V [1 ]
Afonasenko, Tatyana N. [1 ]
Khramov, Evgeny, V [2 ]
Trenikhin, Mikhail, V [1 ]
Prosvirin, Igor P. [3 ]
Shlyapin, Dmitry A. [1 ]
机构：
[1] Boreskov Inst Catalysis, Ctr New Chem Technol BIC, Neftezavodskaya St 54, Omsk 644040, Russia
[2] Natl Res Ctr, Kurchatov Inst, Kurchatov Sq 1, Moscow 123182, Russia
[3] Boreskov Inst Catalysis, Fed Res Ctr, 5 Lavrentiev Ave, Novosibirsk 630090, Russia
来源：
CHEMCATCHEM | 2022年 / 14卷 / 21期
关键词：
bimetallic catalyst; palladium; EXAFS spectroscopy; hydrogenation; PdZn; SELECTIVE HYDROGENATION; PALLADIUM CATALYSTS; METHANOL SYNTHESIS; PD/ZNO CATALYSTS; ALLOY CATALYSTS; PARTICLE-SIZE; CARBON; CO2; SEMIHYDROGENATION; NANOPARTICLES;
D O I：
10.1002/cctc.202200893
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Structural features of bimetallic Pd-Zn catalysts supported on Sibunit carbon material were studied by EXAFS, TEM, XRD and XPS methods, depending on the heat treatment conditions in hydrogen. It was found that supported particles of PdZn intermetallic compound of tetragonal structure are formed in all samples. An increase in the duration of catalyst reduction in H-2 at 500 degrees C from 1 to 20 hours leads to an increase in the amount of PdZn intermetallic particles (d(av)=2-3 nm), which is confirmed by the increasing of the Pd-Zn coordination number from 2.4 to 4.3 and by the decreasing of the surface Pd-0/PdZn ratio from 0.63 to 0.18. The observed changes in the nature and structure of active sites provide an increase in the ethylene selectivity of Pd-Zn/C catalysts in liquid-phase acetylene hydrogenation.
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页数：8
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