Graphene based catalysts for deep hydrodesulfurization of naphtha and diesel fuels: A physiochemical study

Hajjar, Zeinab; Kazemeini, Mohammad; Rashidi, Alimorad; Bazmi, Mansour

doi:10.1016/j.fuel.2015.10.040

Cited by 37 publications

(23 citation statements)

References 42 publications

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“…Therefore, the amount of sulfur and nitrogen compounds in fuels should be decreased to provide a clean environment. Hydrodesulfurization (HDS) (Gao et al, 2011;González-Cortés et al, 2006;Hajjar et al, 2015Hajjar et al, , 2016aHajjar et al, , 2017aHajjar et al, , 2017bHuirache-Acuña et al, 2012;Mendoza-Nieto et al, 2015;Miller et al, 2000;Shan et al, 2015) and hydrodenitrogenation (HDN) (Sundaramurthy et al, 2006;Zepeda et al, 2016) are the main processes considered for reducing the Total Sulfur (T.S.) and Total Nitrogen (T.N.)…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, activated carbon has also been used as catalyst support of NiMo in HDT of light gas oil (Rambabu et al, 2014). Recently, graphene has been widely used as an efficient catalyst support (Al-Daous, 2015;Hajjar et al, 2016aHajjar et al, , 2016bHajjar et al, , 2017aJulkapli and Bagheri, 2015;Liu et al, 2014;Wang et al, 2015). Liu et al (2014) prepared MoS 2 /graphene nanocomposites for HDS of carbonyl sulfide; Wang et al (2015) supported the NiMo over graphene-modified mesoporous TiO 2 for HDS of dibenzothiophene, which reported desirable results for graphene as an efficient catalyst support.…”

Section: Introductionmentioning

confidence: 99%

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Ni-Mo Supported Nanoporous Graphene as a Novel Catalyst for HDS and HDN of Heavy Naphtha

Behnejad

Abdouss

Tavasoli

2019

Braz. J. Chem. Eng.

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Reducing sulfur and nitrogen compounds is essential in producing clean fuels for providing a green environment. In this regard, a novel nanocatalyst has been proposed for Hydrodesulfurization (HDS) and Hydrodenitrogenation (HDN) of heavy naphtha. To this end, Ni-Mo was loaded on nanoporous graphene (Ni-Mo/NG) through the incipient wetness impregnation method. The synthesized nanocatalyst was characterized by FE-SEM, ICP, BET, FTIR, XRD and TPR methods. The catalytic activity of the Ni-Mo/NG catalyst was evaluated at 290 o C and 30 bar. For the synthesized Ni-Mo/NG catalyst, conversions of total sulfur, total nitrogen and R-SH compounds (mercaptans) were obtained as 99.5, 99.4 and 99.3%, respectively, which shows considerable enhancement in comparison to the Ni-Mo/γ-Alumina industrial catalyst.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ni-Mo Supported Nanoporous Graphene as a Novel Catalyst for HDS and HDN of Heavy Naphtha

Behnejad

Abdouss

Tavasoli

2019

Braz. J. Chem. Eng.

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“…In particular, the unique thermal, mechanical and electronic properties of graphene, combined with its inherently high surface area, has resulted in a number of papers considering its potential as a catalyst support (ref. 5,6 and references therein). The role of the functional groups in the nucleation and adsorption of the active particles on these substrates is readily acknowledged in these papers and a study by Marques et al 6 addressed the issue directly, looking at the nucleation of gold from aqueous solutions at graphene and graphene oxide powders.…”

Section: Introductionmentioning

confidence: 99%

The deposition of metal nanoparticles on carbon surfaces: the role of specific functional groups

Bowden

Davies

et al. 2018

Faraday Discuss.

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The enormous complexity of a typical heterogeneous catalyst makes understanding the development and properties of any active nanoparticles present extremely challenging.In the case of carbon based catalysts that difficulty is compounded by the variability of the carbon powders used. We have previously developed a strategy that addresses these problems by mimicking the catalyst preparation conditions very closely but using highly ordered pyrolytic graphite crystals (HOPG) as a model surface. This enables us to examine the effects of specific functional groups on nanoparticle formation. We report here an extension of our work characterising functional groups on the HOPG surface, using XPS and AFM to explore the deposition of gold from aqueous solution onto HOPG surfaces treated in a variety of ways to alter the surface functionality. The structure and oxidation state of the resulting nanoparticles depend critically on the nature of the functional groups present and offers some insight into the development of catalysts based on these materials. Hydroxyls are identified as key functional species, reducing gold ions to their metallic state whilst being oxidised themselves to carbonyls.Carbonyls meanwhile promote the nucleation of Au 3+ , creating a network of islands at the HOPG surface. The results have relevance not only to catalysts using activated carbons but also the new generation of materials based on graphene and carbon nanotubes.

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“…To tackle this problem of low specific surface area and low pore volume, carbon-based nanostructures including carbon nanotubes (CNTs) (Soghrati et al 2012), nanoporous graphene (Hajjar et al 2015(Hajjar et al , 2016(Hajjar et al , 2017 and active carbon (Nikulshin et al 2014) have been considered as graphene supports. The nanocarbon materials possess high surface area and pore volume, which leads to better distribution of the catalyst active sites and hence can enhance the catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

“…Liu et al synthesized MoS 2 /graphene for HDS of carbonyl sulfide which yielded high catalytic efficiency (Liu et al 2014). Furthermore, Hajjar et al (2016) studied graphene-based catalysts for HDS of naphtha and diesel. Co/Mo supported over graphene showed significant performance and reduced the sulfur content of the diesel from 13,000 to 13 ppm (Hajjar et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Effect of graphene functionalizing on the performance of NiMo/graphene in HDS and HDN reactions

2019

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In this research, to remove sulfur and nitrogen compounds from heavy naphtha, various nanocatalysts were prepared through supporting NiMo over nanoporous graphene and evaluated in hydrodesulfurization and hydrodenitrogenation reactions. The nanoporous graphene was initially functionalized in order to facilitate the metal being loaded on it. Three different methods were used to functionalize the nanoporous graphene. The NiMo/nanoporous graphene nanocatalysts were characterized by field emission scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, inductively coupled plasma optical emission spectrometry, temperature-programmed reduction, nitrogen adsorption-desorption isotherms and transmission electron microscopy techniques. Catalyst performance was evaluated in terms of conversions of sulfur, mercaptans (R-SH) and nitrogen compounds. It was found that the functionalized nanoporous graphene support could significantly enhance the catalytic performance in comparison with the industrial NiMo/alumina catalyst. Among the functionalized graphene supports, amine-functionalized graphene exhibited the best results. By using NiMo supported over amine-functionalized graphene, the conversions of total sulfur and R-SH reached 97.8% and 98.1%, respectively.

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Graphene based catalysts for deep hydrodesulfurization of naphtha and diesel fuels: A physiochemical study

Cited by 37 publications

References 42 publications

Ni-Mo Supported Nanoporous Graphene as a Novel Catalyst for HDS and HDN of Heavy Naphtha

Ni-Mo Supported Nanoporous Graphene as a Novel Catalyst for HDS and HDN of Heavy Naphtha

The deposition of metal nanoparticles on carbon surfaces: the role of specific functional groups

Effect of graphene functionalizing on the performance of NiMo/graphene in HDS and HDN reactions

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