Ni catalysts with different promoters supported on zeolite for dry reforming of methane

Abstract

Dry reforming of methane (DRM) is considered a high endothermic reaction with operating temperatures between 700 and 1000°C to achieve high equilibrium conversion of CH 4 and CO 2 to the syngas (H 2 and CO). The conventional catalysts used for DRM are Ni-based catalysts. However, many of these catalysts suffer from the short longevity due to carbon deposition. This study aims to evaluate the effect of La and Ca as promoters for Nibased catalysts supported on two different zeolite supports, ZL (A) (BET surface area = 925 m 2 /g, SiO 2 /Al 2 O 3 mol ratio = 5.1), and ZL (B) (BET surface area = 730 m 2 /g, SiO 2 /Al 2 O 3 mol ratio = 12), for DRM. The physicochemical properties of the prepared catalysts were characterized with XRD, BET, TEM and TGA. These catalysts were tested for DRM in a microtubular reactor at reaction conditions of 700°C. The catalyst activity results show that the catalysts Ni/ZL (B) and Ca-Ni/ZL (B) give the highest methane conversion (60 %) with less time on stream stability compared with promoted Ni on ZL (A). In contrast, La-containing catalysts, La-Ni/ZL (B), show more time on stream stability with minimum carbon content for the spent catalyst indicating the enhancement of the promoters to the Ni/ZL (A) and (B), but with less catalytic activity performance in terms of methane and carbon dioxide conversions due to rapid catalyst deactivation.

Overview of Current and Future Perspectives of Saudi Arabian Natural Clinoptilolite Zeolite: A Case Review

“…As a result, more efficient methods can be provided in the modification of local Saudi zeolite materials for use in a greater range of industrial production applications such as the coke formation. Studies were performed to understand challenges of the coke formation on other type of zeolite like H-ZSM-5 8 Journal of Chemistry zeolite [87] during the conversion of dimethyl ether to Olefins. e problems of coke formation on H-ZSM-5 zeolite [87] during conversion of dimeththyl ether to olefins have been researched with particular attention to process variables in the coking and rejuvenation of the zeolite catalyst in the fixed bed reactor [122].…”

“…In general, zeolites are of great interest to researchers working in the various fields such as energy recovery technology [1], water adsorption [2], ion exchangers, adsorbents, catalysts [3,4], acid-catalyzed dehydration of alcohols [5][6][7] for dry reforming of methane [8], and synthesis of zeolites with nonporous titania for corrosion resistance applications [9], as well for agriculture and food production [10].…”

Advantages of Yolk Shell Catalysts for the DRM: A Comparison of Ni/ZnO@SiO2 vs. Ni/CeO2 and Ni/Al2O3

“…Amongst the extensive assortment of catalysts reviewed in literature, active transition metals such as nickel and cobalt are frequently used due to their relatively high performance and small expense. The use of nickel presents a challenge, as it has a tendency for deactivation from coke formation at low temperatures, and sintering at high temperatures [19,20]. Despite this, however, the use of Ni catalytic formulations remains popular.…”

Dry reforming of methane for syngas production over Ni–Co-supported Al2O3–MgO catalysts

“…Recently, the global warming issue is getting crucial due to the substantial dependence on petroleum-based energy that leads to the increment of greenhouse-gas emissions within the atmosphere [30]. The concentration of CO 2 in the atmosphere has currently increased by about 1.5 ppm/ year which indicated that if there is about 5.3 × 10 21 g air, the rate of CO 2 increase is about 8 billion tons per year [5]. These realities encouraged the study on the development of CO 2 reforming of methane that would effectively reduce the level of CO 2 and CH 4 within the atmosphere.…”