Results
Title

Two-step thermochemical looping using modified ceria-based materials for splitting CO.

Authors

Zhao, Baohuai; Huang, Chunyi; Ran, Rui; Wu, Xiaodong; Weng, Duan

Abstract

This work presents an investigation of CeO, CeZrO (CZ), and La, Pr-doped CeO-ZrO (LP-CZ) for thermochemical two-step splitting of CO. The materials are synthesized by coprecipitation method and characterized by X-ray diffraction, scanning electron microscopy, Raman spectroscopy, and H temperature-programmed reduction. The cyclic CO splitting performance of the samples is measured using thermogravimetric analysis. The results reveal that CZ and LP-CZ show comparable splitting efficiency with the average CO productions of 272 and 288 μmol g, respectively, which are much larger than those of CeO. CZ and LP-CZ benefit from the Zr modification on their structure ( t″ phase) and numerous oxygen vacancies which apparently facilitates oxygen migration. LP-CZ exhibits more rapid recovery post-splitting compared to the other two samples, as a result of its better thermal stability and favorable 'vacancy-rich' structure for oxygen exchange and migration. This has potential to be driven for further developments in various applications.

Subjects

THERMOCHEMISTRY; CERIUM oxides; CARBON dioxide; X-ray diffraction; CHEMICAL sample preparation

Publication

Journal of Materials Science, 2016, Vol 51, Issue 5, p2299

ISSN

0022-2461

Publication type

Academic Journal

DOI

10.1007/s10853-015-9534-7