Mechanism and Kinetics of Ethanol Oxidation over Ru(Pt) Supported onto Mn-Cr-O Mixed Oxides
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
Chemical Engineering Journal
ISSN: 1385-8947
, E-ISSN: 1873-3212
|
| Output data |
Year: 2018,
Volume: 333,
Pages: 101-110
Pages count
: 10
DOI:
10.1016/j.cej.2017.09.100
|
| Tags |
18O SSITKA, Ethanol oxidation, Mechanism, Pt(Ru)/Mn-Cr-O, Syngas |
| Authors |
Pinaeva L.G.
1
,
Sadovskaya E.M.
1,2
,
Smal E.A.
1
,
Bobin A.S.
1
,
Sadykov V.A.
1,2
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis, 630090 Novosibirsk, Russia
|
| 2 |
Novosibirsk State University, 630090 Novosibirsk, Russia
|
|
Funding (2)
|
1
|
Federal Agency for Scientific Organizations
|
0303-2016-0013
|
|
2
|
Federal Agency for Scientific Organizations
|
0303-2016-0010
|
Mn-Cr-O mixed oxide (SP) and 2%Pt/SP and 2%Ru/SP samples prepared by incipient wetness impregnation of SP with RuCl3 or H2PtCl6 water solutions were tested in ethanol oxidation (ORE, 1.6%C2H5OH + 0.58%O2 in He) and water gas shift (WGSR, 1.2%CO + 1.2%H2O in He) reactions at 400 °C and 550 °C. At close ethanol conversion over all samples, 2%Ru/SP exhibited the highest selectivity towards CO and H2 and the best activity in WGSR. Analysis of isotope responses during C2H5OH + 16O2/C2H5OH + 18O2 and C2H5OH + 16(18)O2/16(18)O2 switches revealed formation of both CO and CO2 from the same intermediate – CH3CHO. At this, oxygen in CO comes from CH3CHO, while in CO2 – from the catalyst. Final CO/CO2 and H2/H2O ratios are determined by WGSR which obeys redox mechanism. It is faster reoxidation of Run+ by H2O (and probably, CO2) that is responsible for highest yield of syngas products on 2%Ru/SP sample.