TY - JOUR

T1 - Powder and structured Pt/Ce0.75Zr0.25O2-based catalysts: Water gas shift performance and quasi in situ XPS studies

AU - Gorlova, A. M.

AU - Panafidin, M. A.

AU - Shilov, V. A.

AU - Pakharukova, V. P.

AU - Snytnikov, P. V.

AU - Potemkin, D. I.

N1 - Funding Information: The reported study was supported by Russian Science Foundation under the project 21-79-10377 (water gas shift tests of the powder and structured catalysts) and 21-73-20075 (catalyst characterization). The XRD and TEM studies were carried out using facilities of the shared research center “National center of investigation of catalysts” at Boreskov Institute of Catalysis. Publisher Copyright: © 2022 Hydrogen Energy Publications LLC

PY - 2023/4/15

Y1 - 2023/4/15

N2 - The data on the performance in water gas shift reaction of a powder 5 wt% Pt/Ce0.75Zr0.25O2 and a structured 0.33 wt% Pt/Ce0.75Zr0.25O2/θ-Al2O3/FeCrAl catalysts are reported in this work. For the powder one the lowest outlet CO concentrations were shown to be 0.5, 0.9 and 1.5 vol% corresponding to the initial ones of 5, 10 and 15 vol%, respectively; the temperature required to reach these values did not exceed 310 °C. The quasi in situ XPS data have shown that doping CeO2 with Zr enhances the reducibility of the oxide allowing Ce3+ formation without any treatment. Additionally, it was found that there are 20–30% of nonmetallic Pt atoms on the surface even after a treatment in CO at 300 °C. For the structured catalyst the downward temperature gradient along the monolith was observed with a dispersion of 50–60 °C. The lowest CO concentrations were observed at the temperatures at the catalyst's back point of 280 °C–3.9 and 4.3 vol% CO in the dry gas for 15,700 and 31,400 cm3·gcat−1·h−1, respectively, for 10 vol% CO in the feed gas.

AB - The data on the performance in water gas shift reaction of a powder 5 wt% Pt/Ce0.75Zr0.25O2 and a structured 0.33 wt% Pt/Ce0.75Zr0.25O2/θ-Al2O3/FeCrAl catalysts are reported in this work. For the powder one the lowest outlet CO concentrations were shown to be 0.5, 0.9 and 1.5 vol% corresponding to the initial ones of 5, 10 and 15 vol%, respectively; the temperature required to reach these values did not exceed 310 °C. The quasi in situ XPS data have shown that doping CeO2 with Zr enhances the reducibility of the oxide allowing Ce3+ formation without any treatment. Additionally, it was found that there are 20–30% of nonmetallic Pt atoms on the surface even after a treatment in CO at 300 °C. For the structured catalyst the downward temperature gradient along the monolith was observed with a dispersion of 50–60 °C. The lowest CO concentrations were observed at the temperatures at the catalyst's back point of 280 °C–3.9 and 4.3 vol% CO in the dry gas for 15,700 and 31,400 cm3·gcat−1·h−1, respectively, for 10 vol% CO in the feed gas.

KW - Ceria

KW - Platinum catalyst

KW - Structured catalyst

KW - Water gas shift

UR - http://www.scopus.com/inward/record.url?scp=85133730451&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/1a3286f9-9343-3c97-ae31-220801cbe6b0/

U2 - 10.1016/j.ijhydene.2022.06.028

DO - 10.1016/j.ijhydene.2022.06.028

M3 - Article

AN - SCOPUS:85133730451

VL - 48

SP - 12015

EP - 12023

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 0360-3199

IS - 32

ER -