The effects of Co/Ce loading ratio and reaction conditions on CDRM performance of Co Ce/ZrO2 catalysts

Abstract

This work mainly aims to establish a link between Co/Ce loading ratio in CoeCe/ZrO 2 catalysts and their Carbon Dioxide Reforming of Methane (CDRM) performance. In this context, catalysts with different Co and Ce loadings were prepared and characterized via BET, XRD, HRTEM-EDX, XPS and Raman, and parametrically tested under different CDRM conditions. Dispersion of Co particles was nonhomogeneous on all samples. For the sample with the highest Co/Ce ratio (10%Coe2%Ce/ZrO 2), higher amount of lattice oxygen vacancies and lowest degree of ceria reduction were determined. Raman analysis showed that graphitic carbon coexisted with amorphous carbon on the surface of all spent samples. The extent of side reactions prevailed in determining selectivity. It was expressed that both CoeCe synergistic interaction and synchronous contribution of Ce and ZrO 2 were enhanced for the samples having lower Co/Ce ratio. It was confirmed that Ce is only responsible for oxygen transfer but not its formation.

Large Specific Surface Area Macroporous Nanocast LaFe1−xNixO3: A Stable Catalyst for Catalytic Methane Dry Reforming

“…However, Ni-based catalysts tend to become deactivated when subjected to long-term reactions due to C deposition and the sintering of Ni grains. erefore, resistance to C deposition and prevention of Ni particle sintering must be studied [13,[16][17][18][19][20][21][22][23][24].…”

Kinetic and mechanistic features of carbon dioxide reforming of methane over Co–Ce/ZrO2 catalysts

“…The preparation procedure of 5%Co–2%Ce/ZrO 2 and 10%Co–2%Ce/ZrO 2 samples, the experimental setup, and equipment for feed and product analysis were used as described in our previous work . The physical properties of the catalysts such as crystallite sizes and surface areas were also detected and discussed previously …”

“…By using a similar approach for the Co–Ce/ZrO 2 system, properties of catalysts having different Co:Ce loading ratios and their CDRM performance characteristics were first obtained . The results revealed that both the properties and performances are highly sensitive to catalyst composition, i.e., the Co:Ce ratio.…”

“…The results revealed that both the properties and performances are highly sensitive to catalyst composition, i.e., the Co:Ce ratio. According to the performance results, 5%Co–2%Ce/ZrO 2 was found to have the most stable activity, whereas higher CDRM activity was obtained over 10%Co–2%Ce/ZrO 2 . As the continuation of performance analysis of the Co–Ce system, the present work focuses on to determine the CDRM kinetic behavior of 5%Co–2%Ce/ZrO 2 and 10%Co–2%Ce/ZrO 2 catalysts as a function of partial pressures of the reactants, products, and temperature, and through comparative analysis of power‐law type rate expressions and possible surface reaction models to explain the effect of the Co:Ce loading ratio on kinetic and mechanistic parameters.…”

Ethylene glycol dry reforming for syngas generation on Ce-promoted Co/Al2O3 catalysts

“…The extent of carbon crystallinity can be justified using the relative integrated area of D-G bands (I D /I G ). A small I D /I G value demonstrates high crystallinity because of dominant amounts of graphitized carbon [30]. The 10% Co/Al 2 O 3 showed a lower graphitization extent (I D /I G = 2.20) than 3% Ce-10% Co/Al 2 O 3 (I D /I G = 1.63).…”