Structured silicalite‐1 encapsulated Ni catalyst supported on SiC foam for dry reforming of methane

Abstract

Structured silicalite‐1 zeolite encapsulated Ni catalyst supported on silicon carbide foam (i.e., Ni@S1‐SiC) was prepared using a new yet simple one‐pot method, showing the significantly improved anti‐sintering and anti‐coking performance in comparison with the conventional supported and encapsulated Ni catalysts (i.e., Ni/S1, Ni/S1‐SiC, and Ni@S1), in catalytic dry reforming of methane (DRM). The developed Ni0.08@S1‐SiC catalyst showed high CO2/CH4 conversions of >85% and H2/CO molar ratio of >0.85 at 700°C, outperforming other control catalysts under investigation. Additionally, the Ni0.08@S1‐SiC catalyst demonstrated high turnover frequency (TOF) values of ~5.6 and ~2.1/s regarding to CO2/CH4 conversions at 400°C, exhibiting excellent stability and low pressure‐drop during 100 hr on stream evaluation. Post‐reaction characterization of the used catalysts demonstrated that the combination of zeolite encapsulated Ni catalysts and SiC foam enabled well‐dispersed and ultrafine Ni nanoparticles, low pressure drop and intensified transfer steps, presented excellent anti‐sintering and anti‐coking abilities.

Effect of Carburization Conditions on the Activity of Molybdenum Carbide-Supported Catalysts Promoted by Nickel for the Dry Reforming of Methane

“…Among the catalysts supported on Al 2 O 3 , 04NiMoAl carburized at 750 °C was the one that presented the highest TOF value (2.35 s –1 ). For the catalysts supported on SiC, 03NiMoSiC carburized at 800 °C was the most active, with a TOF value of 2.69 s –1 , the same order of magnitude as those reported in the literature (1–2 s –1 ). − This result reinforces the fact that high carburization temperatures exert a negative influence only on catalysts supported on Al 2 O 3 , which have a greater tendency to form carbon.…”

Developing Silicalite-1 Encapsulated Ni Nanoparticles as Sintering-/Coking-Resistant Catalysts for Dry Reforming of Methane

“…Accordingly, the carbon balance of the reaction over all the catalysts (Figure S8) decreased progressively as a function of reaction temperature, suggesting carbon and H 2 formation is promoted from CH 4 decomposition at high reaction temperatures [39]. Theoretically, the H 2 /CO molar ratio is expected to be unity, whereas in this work, the highest value obtained by the catalysts was around 0.9 at 700 • C (for 5Ni@SiO 2 -S1), suggesting the possible occurrence of RWGS [40].…”

Dry reforming of methane on bimetallic Pt–Ni@CeO2catalyst: ain situDRIFTS-MS mechanistic study

“…Although relatively stable catalytic performance was achieved by Pt@CeO2, the reaction was terminated due to physical blocking of the packed bed (with the measured pressure drop >2 bar), which was caused by carbon deposition in between catalyst pellets rather than on the metal surface. 35 Conversely, as shown in Fig. 3c, the bimetallic Pt-Ni@CeO2 catalysts showed significantly stable performance in DRM without deactivation compared to the monometallic catalysts, especially Ni@CeO2.…”