Ni–Al bimetallic catalysts for preparation of multiwalled carbon nanotubes from polypropylene: Influence of the ratio of Ni/Al

Shen, Yinlong; Gong, Weiguang; Zheng, Bin; Gao, Lei

doi:10.1016/j.apcatb.2015.08.051

Cited by 60 publications

(36 citation statements)

References 49 publications

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“…The G' band observed at around wavelength 2700 cm −1 is associated with the process of two-photon elastic scattering. The peak intensity ratio of I D /I G is used to determine the defects and degree of graphitization of carbon deposits, and a higher ratio of I G' /I G also implies higher carbon nanotubes purity [24,54]. Both Ni/γ-Al 2 O 3 and Ni/α-Al 2 O 3 catalysts gave an I D /I G ratio of about 0.95 and an I G' /I G ratio of less than 0.4, indicating the poor quality of deposited carbons over the Ni catalysts.…”

Section: Yao Et Al Applied Catalysis B: Environmental 221 (2018) mentioning

confidence: 99%

Co-production of hydrogen and carbon nanotubes from real-world waste plastics: Influence of catalyst composition and operational parameters

Yao

Zhang

Williams

et al. 2018

Applied Catalysis B: Environmental

234

134

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A B S T R A C TThe use of Ni-Fe catalysts for the catalytic pyrolysis of real-world waste plastics to produce hydrogen and high value carbon nanotubes (CNT), and the influence of catalyst composition and support materials has been investigated. Experiments were conducted in a two stage fixed bed reactor, where plastics were pyrolysed in the first stage followed by reaction of the evolved volatiles over the catalyst in the second stage. Different catalyst temperatures (700, 800, 900°C) and steam to plastic ratios (0, 0.3, 1, 2.6) were explored to optimize the product hydrogen and the yield of carbon nanotubes deposited on the catalyst. The results showed that the growth of carbon nanotubes and hydrogen were highly dependent on the catalyst type and the operational parameters. Fe/ γ-Al 2 O 3 produced the highest hydrogen yield (22.9 mmol H 2 /g plastic ) and carbon nanotubes yield (195 mg g −1 plastic ) among the monometallic catalysts, followed by Fe/α-Al 2 O 3 , Ni/γ-Al 2 O 3 and Ni/α-Al 2 O 3 . The bimetallic Ni-Fe catalyst showed higher catalytic activity in relation to H 2 yield than the monometallic Ni or Fe catalysts because of the optimum interaction between metal and support. Further investigation of the influence of steam input and catalyst temperature on product yields found that the optimum simultaneous production of CNTs (287 mg g −1 plastic ) and hydrogen production (31.8 mmol H 2 /g plastic ) were obtained at 800°C in the absence of steam and in the presence of the bimetallic Ni-Fe/γ-Al 2 O 3 catalyst.

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Section: Yao Et Al Applied Catalysis B: Environmental 221 (2018) mentioning

confidence: 99%

Co-production of hydrogen and carbon nanotubes from real-world waste plastics: Influence of catalyst composition and operational parameters

Yao

Zhang

Williams

et al. 2018

Applied Catalysis B: Environmental

234

134

View full text Add to dashboard Cite

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“…For promoting the size stability and catalytic activity of monometallic catalysts, Shen et al . prepared Al‐Ni and Mg‐Ni bimetallic catalyst to combine with organically modified clay for the synthesis of CNTs from PP . In our previous works, a kind of trimetallic catalysts, i.e.…”

Section: Introductionmentioning

confidence: 99%

Universal Ni‐Mo‐Mg catalysts combined with carbon blacks for the preparation of carbon nanotubes from polyolefins

Cui

Tan

Song

2016

J of Applied Polymer Sci

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Plastics used as carbon source present a sustainable and environmentally benign route for the preparation of carbon nanotubes (CNTs); however, the current catalysts basically take effect on a certain type of plastics. Herein, a significantly universal carbonization performance of Ni‐Mo‐Mg catalysts has been created for polypropylene (PP), polyethylene (PE), polystyrene (PS), and their blends with the highest CNT yields of 26.24%, 28.36%, 18.39%, and 31.66%. With the further introduction of a universal synergistic agent (nanosized carbon black), the maximum CNT yields of 53.56%, 65.95%, 41.85%, and 59.83% from PP, PE, PS, and their blends were achieved, respectively. The morphology, microstructure, and the graphitization of above CNTs were measured by scanning electron microscopy, transmission electron microscopy, X‐ray diffractometer, Raman spectroscopy, and high‐resolution transmission electron microscope. Results demonstrated that the addition of carbon black could further improve the morphology of CNTs and enhance the graphitization of CNTs. Within three polyolefins, the PS offered the highest graphitization of CNTs. Finally, the highly universal carbonization performance of Ni‐Mo‐Mg catalysts and the universal synergistic effect were also discussed. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44647.

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“…In fact, the combination of various catalysts proves out to be more beneficial for quality and yield as well [14]. For example, Rh-Pt catalyst produced narrow diameter distribution of CNTs [15], Fe-Mo catalyst produced the highest crystallinity CNTs [16], Ni-Al produced a positive change in the yield of MWCNTs [17], Ni-Co catalysts supported on TiO 2 for use in CVD depicted a positive response in growth process of nanotubes [18], whereas a synergistic effect was observed on the growth of CNTs using Fe-Co catalyst [19]. Likewise, Co-W also influenced the growth in case of an arc discharge method [20].…”

Section: Introductionmentioning

confidence: 99%

“…Likewise, Co-W also influenced the growth in case of an arc discharge method [20]. All the above-cited papers [13][14][15][16][17][18][19][20] along with other studies [20][21][22][23][24][25] report the use of bi-metallic catalysts for synthesizing nanotubes for the better reason of improved quality, yield and at the same time keeping in view the potential applications of the as-prepared nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of multi-walled carbon nanotubes by thermal CVD technique on Pt–W–MgO catalyst

Shah

Najar

Sharda

et al. 2018

Journal of Taibah University for Science

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Both tungsten (W) and platinum (Pt) are materials of interest in modern science and technology. Here, in this paper, we report the growth of multi-walled carbon nanotubes (MWCNTs) by thermal chemical vapour deposition (CVD) on Pt-W catalyst with MgO as a support material. The XRD studies were used to determine the structural characteristic of the as-prepared catalyst. Raman spectroscopy studies confirm the growth of MWCNTs with less structural defects and non-crystalline carbonaceous products. The images of field scanning electron microscope (FESEM) show that the grown network of carbon nanotubes (CNTs) contains less impurities, whereas the high-resolution transmission electron microscope (HRTEM) images indicate that the grown MWCNTs have good crystallinity with no lateral carbon deposit. TGA of the unpurified CNT product shows the addition of catalyst particles with the sample. This study will pave way for the new research area in the synthesis of CNTs and their applications in the electronic industry. Moreover, the results were compared with the previously reported results in the literature. ARTICLE HISTORY

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Ni–Al bimetallic catalysts for preparation of multiwalled carbon nanotubes from polypropylene: Influence of the ratio of Ni/Al

Cited by 60 publications

References 49 publications

Co-production of hydrogen and carbon nanotubes from real-world waste plastics: Influence of catalyst composition and operational parameters

Co-production of hydrogen and carbon nanotubes from real-world waste plastics: Influence of catalyst composition and operational parameters

Universal Ni‐Mo‐Mg catalysts combined with carbon blacks for the preparation of carbon nanotubes from polyolefins

Synthesis of multi-walled carbon nanotubes by thermal CVD technique on Pt–W–MgO catalyst

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