Abstract
Recently, the dry reforming of methane (DRM) has received much attention as a conversion technology of greenhouse gases. Ni-based catalysts supported on ternary metal oxide composite (ZrTiAlOx) were prepared to improve the coke resistance properties in the DRM (CH4:CO2 = 1) at low temperature. The ZrTiAlOx supports with different ratios of Zr/Ti were prepared through the modified Pechini sol-gel method, and then the Ni was impregnated on the synthesized support via the incipient wetness impregnation method. Considering the Zr/Ti ratios, different catalytic activity and durability in the DRM were identified. The Ni/ZrTiAlOx catalyst with Zr/Ti of 2 exhibited enhanced coke inhibition property compared to the others at low temperature DRM for 50 h. The catalysts with a high Zr/Ti ratio under the same condition were rapidly deactivated, while the catalyst with a low Zr/Ti ratio showed deficient activity. It was found from temperature-programmed surface reactions (TPSR) and DRIFTS (Diffuse Reflectance Infrared Fourier Transform Spectroscopy) analysis that the addition of Ti has led in to higher catalytic stability at Zr/Ti = 2, which could be as a result of oxygen vacancies generated by the ternary metal oxides. Ni/ZrTiAlOx catalyst with ratio of Zr/Ti = 2 showed high stability and good catalytic activity towards DRM for the production of syngas.
Highlights
Climate change, air pollution, and global warming have become severe issues; many efforts have been made to reduce greenhouse gases with main focus on CO2 and CH4
Greater pore diameter was attributed to the lower Zr/Ti ratio
The Ni-based catalysts (15% Ni/ZrTiAlOx ) with different Zr/Ti ratios were successfully synthesized by the modified Pechini sol-gel and an impregnation method
Summary
Air pollution, and global warming have become severe issues; many efforts have been made to reduce greenhouse gases with main focus on CO2 and CH4. Many studies have studied the modification of catalyst support, which strongly influences the catalytic behavior and carbon deposition during the DRM [13,15] Various supports such as Al2 O3 , SiO2 , ZrO2 , and TiO2 were investigated to improve catalytic activity and the coke resistance feature [16,17,18,19,20]. It was reported that the TiO2 as support in Ni/TiO2 catalyst could influence to the deactivation of catalytic activity because of migrating TiOx over the nickel surface [21]. The Ni-based catalyst supported on ZrO2 -Al2 O3 -TiO2 was investigated to develop a high-performance catalyst with sufficient coke resistance for the DRM process at low temperatures.
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