Kinetics of liquid-phase diphenylacetylene hydrogenation on “single-atom alloy” Pd-Ag catalyst: Experimental study and kinetic analysis

Kinetics of liquid-phase diphenylacetylene hydrogenation on “single-atom alloy” Pd-Ag catalyst: Experimental study and kinetic analysis Full article

Journal

Molecular Catalysis
ISSN: 2468-8231 , E-ISSN: 2468-8274

Output data

Year: 2021, Volume: 506, Article number : 111550, Pages count : DOI: 10.1016/j.mcat.2021.111550

Authors

Rassolov Alexander V. ¹ , Mashkovsky Igor S. ¹ , Bragina Galina O. ¹ , Baeva Galina N. ¹ , Markov Pavel V. ¹ , Smirnova Nadezhda S. ¹ , Wärnå Johan ² , Stakheev Alexander Yu. ¹ , Murzin Dmitry Yu. ²

Affiliations

1	N.D. Zelinsky Institute of Organic Chemistry RAS, Moscow, Russia
2	Process Chemistry Centre, Åbo Akademi University, Turku, Finland

Catalytic performance of Pd1Ag3/Al2O3 single-atom alloy (SAA) catalyst was studied in liquid-phase hydrogenation of diphenylacetylene (DPA) and compared with the performance of the reference monometallic Pd/Al2O3. Formation of SAA structure in Pd1Ag3/Al2O3 was confirmed by FTIR CO technique. It was found that Pd1Ag3/Al2O3 single-atom alloy catalyst exhibits excellent selectivity in diphenylethene (stilbene) (ca. 98 %), which remains constant over a wide range of DPA conversions (0–95%), while over Pd/Al2O3 selectivity decreases steadily with the increase in DPA conversion. It is remarkable that the selectivity of Pd1Ag3/Al2O3 depends neither on hydrogen pressure (5–15 bar), nor on DPA concentration (0.0262 – 0.159 mol/l). In contrast, over the reference Pd/Al2O3 selectivity tends to decrease with increasing P(H2) and decreasing DPA concentration. The proposed reaction network comprises hydrogenation of DPA in a parallel formation of cis and trans-stilbene with following hydrogenation to bibenzyl and direct formation of the latter from the initial DPA. The calculations clearly shows the capability of the kinetic model to describe the experimental dependencies for Pd1Ag3 single-atom catalyst in an excellent way with the degree of explanation equal to ca. 99 %.

Rassolov A.V. , Mashkovsky I.S. , Bragina G.O. , Baeva G.N. , Markov P.V. , Smirnova N.S. , Wärnå J. , Stakheev A.Y. , Murzin D.Y.
Kinetics of liquid-phase diphenylacetylene hydrogenation on “single-atom alloy” Pd-Ag catalyst: Experimental study and kinetic analysis
Molecular Catalysis. 2021. V.506. 111550 . DOI: 10.1016/j.mcat.2021.111550 WOS Scopus OpenAlex

Web of science:	WOS:000651411600005
Scopus:	2-s2.0-85103761280
OpenAlex:	W3152577378

DB	Citing
OpenAlex	25
Scopus	25
Web of science	25