Effect of the nature of a textural promoter on the catalytic properties of a nickel-copper catalyst for hydrocarbon processing in the production of carbon nanofibers

Screening of Ni-Cu bimetallic catalysts for hydrogen and carbon nanofilaments production via catalytic decomposition of methane

“…concentration [25,59]. In any case, all the catalysts lost their activity after 10 min of reaction due to the blockage of their active sites.…”

“…In this regard, bimetallic catalysts based on the doping with low contents of noble (Ni-Cu, Ni-Pt, Ni-Pd), ferrous (Ni-Co, Ni-Fe) and refractory metals (Ni-Mo) were explored [8][9][10][11][12][13][14][15][16]. Among them, Cu doping involving the formation of the Ni (x) Cu (1-x) alloy stands out for enhancing the catalyst stability and activity at high temperature in addition to improving its reducibility and modifying the crystalline structure of the resulting carbon nanofilaments [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31].…”

“…Ni supported catalysts include metal oxides (SiO 2 , Al 2 O 3 , TiO 2 , MgO, and ZrO 2 ) [29,34,35], carbon materials [25,27,35] or zeolites and mesoporous silica [28,31,36] among the most used due to their thermal and chemical stability. A suitable support improves the CDM reaction influencing in the Ni crystal size and its dispersion, the support/metal interaction and the carbon diffusion mechanism [37][38][39].…”

Sol-Gel-Prepared Ni-Mo-Mg-O System for Catalytic Transformation of Chlorinated Organic Wastes into Nanostructured Carbon

“…The oxide Ni-Mo-Mg-O sample (10 mg) was loaded into a basket made of foamed quartz. The basket was fixed in a quartz flow reactor equipped with McBain balances as described elsewhere [ 34 , 37 ]. Then, the sample was heated up to 600 °C in a mixed flow of 40 vol% hydrogen in argon (flowrate of 250 mL/min; heating rate of 20 °C/min) and kept at this temperature for 10 min to reduce the metals (Ni and Mo).…”

“…The Ni-based catalysts and bulk alloys were shown to be efficient for the utilization of the chlorinated organic wastes via their processing into segmented carbon nanofibers [ 34 , 35 , 36 ]. The addition of a textural promoter helped stabilize the nanoparticles in the dispersed state and control the size of the carbon nanofibers being formed [ 37 ]. Quite recently, it was found that the modification of Ni with Mo improves the catalytic performance of the catalyst and affects the structure and morphology of the formed carbon product [ 20 , 21 ].…”