Nanosized Ni/SBA-15 Catalysts for CO2 Reforming of CH4

Abstract

Ni, Co, and Co–Ni bimetallic catalysts supported over SBA-15 and over SBA-15 doped with Zn or Ce oxides were prepared and tested in a methane dry reforming reaction. The loading of the metals in the catalyst was 5 wt % for either mono or bimetallic catalysts. The prepared catalysts were tested in a continuous-flow fixed-bed reactor at 800 °C under atmospheric pressure. XRD, TPR, TPD, and SEM characterization techniques were employed to investigate the catalytic properties of fresh catalysts. SEM and TGA were used to study the catalytic properties of spent catalysts. A remarkable effect on the reduction properties and catalytic performance of catalysts was observed after adding Zn and Ce. Over an 8 h test, Ni/SBA-15 showed the best activity and stability. The conversion was 90% for CH4 and CO2. Co–Ni/SBA-15 and Co–Ni/Ce–SBA-15 have shown a reasonable activity and stability. Selectivity of the Ni/SBA-15 catalyst was higher than all other catalysts as indicated by the H2/CO ratio. Co/SBA-15 and Co–Ni/Zn–SBA-15 showed a low activity and selectivity. TPD–NH3 profiles indicated that doping SBA-15 with Ce and/or Zn increased the catalyst acidic sites. Ni/SBA-15 is an excellent potential catalyst for commercial methane dry reforming processes.

SBA-15 obtained from rice husk ashes wet-impregnated with metals (Al, Co, Ni) as efficient catalysts for 1,4-dihydropyridine three-component reaction

“…The same effect was reported by Ibrahim et al , 89 which indicated that Ni sintering was easier than Al and Co, and alloying with other metals was necessary (usually a noble metal, such as Au) to avoid this sintering. It means that nickel formations are probably occupying more mesopore than micropore channels, as can be observed from the pore size distribution (Fig.…”

Catalytic Pyrolysis of the Green Microalgae Botryococcus braunii over Ni/SBA-15 Prepared by the Ultrasonic-Assisted Sol-Gel Method

“…The synthesis of SBA-15 as a catalyst support in the previous studies ,− were often performed using the sol–gel method with Pluronic 123 as a template and tetraethylorthosilicate as silica sources. This method requires a considerable time commitment for the hydrolysis–condensation process, which is usually 24 h. In the present study, the synthesis of SBA-15 is conducted using the ultrasonic-assisted sol–gel method for which the hydrolysis–condensation stage is 3 h. The sonication method is used as an alternative to the process of stirring, heating, and vibrating in hydrothermal synthesis .…”

Dry Reforming of Methane with Ni Supported on Mechanically Mixed Yttria-Zirconia Support

“…However, catalysts synthesized using these precious metals cannot be commercialized because of their limited availability and cost [5,6]. Alternatives to these expensive, scarce, precious-metal-based catalysts are Ni-supported catalysts [6][7][8]. On the one hand, Ni is cheap and abundant, in addition to that, its use in catalytic dry reforming of methane reactions has shown promising results.…”