Synthesis, Characterization, and Application of the Mesoporous Molecular Sieve Sr-MCM-41 in the Removal of Naphthenic Acids From a Model Mixture of Aviation Kerosene by Adsorption

Abstract

The MCM-41 mesoporous molecular sieves have attracted a great deal of interest due to their application in adsorption processes, like in the removal of naphthenic acids, which are directly responsible for acidity and corrosiveness of petroleum. The objective of this work is to explore the synthesis, characterization, and application of Sr-MCM-41 in removing naphthenic acids from a model mixture of aviation kerosene (jet fuel) by adsorption. The adsorbent was characterized and a factorial design was used to determine the best operating conditions. The characterization results indicated that the incorporation of strontium did not compromise the mesoporous structure, and that the material showed a good degree of organization. The factorial design indicated that the highest adsorption capacity was obtained for an acid concentration of 7wt.%, an adsorbent amount of 0.01g, and a stirring speed of 420rpm. This study demonstrates the potential of this adsorbent for the removal of the naphthenic acids that are present in jet fuel.

Cerium Incorporated Into a Mesoporous Molecular Sieve (Mcm-41)

“…These bands were also observed by Park et al (2007), Subhan et al (2012), González Vargas et al (2013) and Akondi et al (2014) In both the MCM-41 and Ce-MCM-41 samples, the presence of the template could be confirmed by the bands in the 2800-2900 cm -1 region that are related to C-H stretching. After calcination, these bands of the directing agent disappeared, which indicates that the calcination process was effective in removing such a compound, which was also observed by Park et al (2007) and Nascimento et al (2014). This result corroborates those found in the thermal analysis when there was mass loss due to the removal of the structure directing agent.…”

“…The mesoporous molecular sieve Ce-MCM-41 was synthesized using the hydrothermal method (Nascimento et al, 2014) with silica gel and sodium silicate as the silicon source, cetyltrimethylammonium bromide (CTMABr) as a structural director, cerium nitrate as a transition metal source and distilled water. The synthesis was conducted at 100 °C in a Teflonjacketed stainless steel autoclave for a period of five days with a daily correction pH range of 9.5-10.0 with a 30% solution of acetic acid.…”

“…The incorporation of transition metals (Nilsen et al, 2007;Anunziata et al, 2008), rare earth metals (Zhao et al, 2011;Akondi et al, 2012) and alkaline earth metals Nascimento et al, 2014) into MCM-41 produces new types of adsorbents. The incorporation of rare earth metals into mesoporous silicates showed an improvement in their thermal stability and structural properties, such as pore volume and surface area, compared with that of pure MCM-41 (Chien et al, 2005).…”

Incorporação De Cério À Peneira Molecular Mesoporosa (Mcm-41)

“…Após a decomposição do surfactante, verifica-se a terceira perda de massa de 4,0%, resultante da condensação dos grupos silanóis da superfície interna dos poros que interagiam com as moléculas do direcionador. Estes resultados estão de acordo com a literatura (Park et al, 2007;Ghorbani et al, 2013;Nascimento et al, 2014).…”

“…A incorporação de metais de transição (Nilsen et al, 2007;Anunziata et al, 2008), metais de terras raras (Zhao et al, 2011;Akondi et al, 2012) e metais alcalinos terrosos à MCM-41 produz novos tipos de adsorventes utilizados em diversas aplicações como para remoção de contaminantes de derivados de petróleo.…”