Synergistic effect of macroporosity and crystallinity on catalyst deactivation behavior over macroporous Ni/CexZr1-xO2–Al2O3 for dry reforming of methane

Jamsaz, Azam; Pham-Ngoc, Nhiem; Wang, Mingyan; Jeong, Dong Hwi; Oh, Eun-Seok; Shin, Eun Woo

doi:10.1016/j.cej.2023.146821

Cited by 7 publications

(2 citation statements)

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“…However, it is important to note that DRM is a strong endothermic process, which means that the reaction requires high temperatures. These high temperatures can cause sintering and agglomeration, which can deactivate the catalysts [4,5]. Despite this, numerous studies have found that Ni-based catalysts are effective and promising DRM candidates due to their high availability, low cost, and high activity when compared to noble metals like Pd, Rh, and Ru [6].…”

Section: Introductionmentioning

confidence: 99%

“…Despite this, numerous studies have found that Ni-based catalysts are effective and promising DRM candidates due to their high availability, low cost, and high activity when compared to noble metals like Pd, Rh, and Ru [6]. Nevertheless, although Ni particles show the greatest activity in the DRM response, they are hampered by sintering Ni and carbon buildup [3][4][5]. There must be a robust metal support relationship to halt carbon formation and Ni agglomeration, particularly over the DRM [6].…”

Section: Introductionmentioning

confidence: 99%

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Tailored Ni-MgO Catalysts: Unveiling Temperature-Driven Synergy in CH4-CO2 Reforming

Alghamdi,

Ibrahim,

Ali

et al. 2023

Catalysts

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This study examines nickel catalysts on two different supports—magnesium oxide (MgO) and modified MgO (with 10 wt.% MOx; M = Ti, Zr, Al)—for their effectiveness in the dry reforming of methane. The reactions were conducted at 700 °C in a tubular microreactor. The study compares the best-performing catalyst with a reference catalyst (5Ni/MgO) by conducting dry reforming of methane at different reaction temperatures. The catalysts are evaluated using surface area, porosity, X-ray diffraction, infrared spectroscopy, transmission electron microscope, thermogravimeter, and temperature-programmed techniques. The 5Ni/MgO + ZrO2 catalyst demonstrates inferior catalytic activity due to insufficient active sites. On the other hand, the 5Ni/MgO + TiO2 catalyst shows limited catalytic excellence due to excessive coke deposits, which are six times higher than other catalysts. The 5Ni/MgO and 5Ni/MgO + Al2O3 catalysts have the richest basic and acidic profiles, respectively. The 5Ni/MgO + Al2O3 catalyst is superior to other catalysts due to its stronger metal–support interaction on the expanded surface and the efficient diffusion of carbon on its less crystalline surface. At 700 °C, this catalyst achieves 73% CH4 conversion, and at 800 °C, it reaches 83% conversion. This study emphasizes the crucial role of the reaction temperature in reducing carbon deposition and enhancing the efficiency of the reforming process.

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Section: Introductionmentioning

confidence: 99%