Sawdust as an effective biotemplate for the synthesis of Ce0.8Zr0.2O2and CuO–Ce0.8Zr0.2O2catalysts for total CO oxidation

Sawdust as an effective biotemplate for the synthesis of Ce0.8Zr0.2O2and CuO–Ce0.8Zr0.2O2catalysts for total CO oxidation Научная публикация

Журнал

RSC Advances
ISSN: 2046-2069

Вых. Данные

Год: 2017, Том: 7, Номер: 81, Страницы: 51359-51372 Страниц : 14 DOI: 10.1039/c7ra10791a

Авторы

Kaplin Igor Yu. ¹ , Lokteva Ekaterina S. ¹ , Golubina Elena V. ¹ , Maslakov Konstantin I. ¹ , Strokova Natalia E. ¹ , Chernyak Sergei A. ¹ , Lunin Valery V. ¹

Организации

1	Lomonosov Moscow State University, Chemistry Department, Leninskie Gory 1/3, Moscow, Russia

Wood sawdust (SD) was successfully used as a biotemplate to prepare precursors of Ce0.8Zr0.2O2 (CZ) and CuO–Ce0.8Zr0.2O2 (Cu–CZ, about 25% of CuO) catalysts, which were tested in total CO oxidation at 100–400 °C after calcination at 500 or 600 °C, and compared with analogous systems prepared using cetyltrimethylammonium bromide (CTAB). The improved specific surface area and oxygen mobility of the catalysts calcined at 500 °C resulted in an increased efficiency in CO oxidation. CZ (SD-500) demonstrated much higher catalytic efficiency than the CZ (CTAB-500) sample despite having a two times less SBET due to the promoting action of Ca and K inherited from sawdust and improved concentration of superoxide surface centers. Both facilitation of CO adsorption on peroxide and superoxide centers and increased oxygen mobility provide improvement in the high-temperature efficiency of biomorphic CZ in CO oxidation. The XRD, XPS and TPR data testify that Cu in modified systems partially exists as a separate CuO phase, in small amounts as Cu+, and partially is incorporated in the surface CuyCexZr1−x−yO2−z and/or CuyCe1−yO2−x phases. Modification with Cu enhances the low-temperature efficiency of CZ systems, prepared using both templates and calcined at 500 °C. Cu–CZ (SD-500) was a bit less active than Cu–CZ (CTAB-500) only at 100–150 °C, primarily due to the decreased CuO content, and the difference in CuO interaction with CZ support, found by TPR. Presumably CuO provides low-temperature CO oxidation through the Langmuir–Hinshelwood mechanism; the Cu+/Cu2+ pair can also participate as an additional redox pair in high-temperature CO oxidation by the Mars–van-Krevelen mechanism.

Kaplin I.Y. , Lokteva E.S. , Golubina E.V. , Maslakov K.I. , Strokova N.E. , Chernyak S.A. , Lunin V.V.
Sawdust as an effective biotemplate for the synthesis of Ce0.8Zr0.2O2and CuO–Ce0.8Zr0.2O2catalysts for total CO oxidation
RSC Advances. 2017. V.7. N81. P.51359-51372. DOI: 10.1039/c7ra10791a Scopus OpenAlex

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