Search results for: Valter J. Fernandes

Items from 1 to 20 out of 34 results

article

Thermogravimetry applied for catalytic degradation of atmospheric residue of petroleum on mesoporous catalyst

Carolina B. Aquino, João M. R. Silva, Marcos H. R. Oliveira, Ana C. F. Coriolano, more

Journal of Thermal Analysis and Calorimetry > 2019 > 136 > 5 > 2139-2144

Thermogravimetry was used in order to evaluate thermal and catalytic degradation of atmospheric residue of petroleum (ATR) which is found at Brazilian refineries, after a process of atmospheric distillation. The catalyst used for the thermocatalytic degradation of ATR was the AlMCM-41 mesoporous material. The AlMCM-41 was obtained from hydrothermal method using cetyltrimethylammonium as organic template...

article

Improved thermogravimetric system for processing of oil sludge using HY zeolite catalyst

João M. R. Silva, Ellen K. L. Morais, Jéssica B. Silveira, Marcos H. R. Oliveira, more

Journal of Thermal Analysis and Calorimetry > 2019 > 136 > 4 > 1861-1868

The oil sludge residue presents an aggregate of hydrocarbons, organic and inorganic impurities, and water. The microporous and mesoporous zeolites are considered promising catalysts for processing of petroleum residues generated in refining processes. The aim of this work was to study the degradation of petroleum sludge obtained from primary processing, with applications of an improved thermogravimetry...

article

Synthesis characterization and acid properties of niobium-containing MCM-41

Glauber J. T. Fernandes, Ana C. F. Coriolano, Jilliano B. Silva, Francisco L. Castro, more

Journal of Thermal Analysis and Calorimetry > 2018 > 131 > 1 > 691-695

In the current work, the incorporation of niobium onto the nanostructured MCM-41 material was studied. The syntheses were carried out by the hydrothermal method using cetyltrimethylammonium bromide (CTMABr) as structural template, sodium silicate and water as solvent. Niobium was introduced in the reactive medium in the form of ammonium niobium oxalate, for obtaining Nb-MCM-41 materials. In order...

article

Development of HZSM-12 zeolite for catalytic degradation of high-density polyethylene

Antonio O.S. Silva, Marcelo J.B. Souza, Anne M.G. Pedrosa, Ana C.F. Coriolano, more

Microporous and Mesoporous Materials > 2017 > 244 > C > 1-6

The catalytic degradation of high density polyethylene (HDPE) was studied in the presence of HZSM-12 zeolites with different Si/Al ratio, by thermogravimetry and pyrolysis coupled to gas chromatography and mass spectrometry. The NaZSM-12 zeolite was synthesized by the hydrothermal method using methyltriethylammonium chloride as template. The HZSM-5 was obtained by ion exchange of NaZSM-12 with ammonium...

article

Evaluation of the thermal properties of diesel oil with low sulfur content

Camila G. D. Peixoto, Valter J. Fernandes, Ana C. F. Coriolano, Renkel R. Araujo, more

Journal of Thermal Analysis and Calorimetry > 2018 > 131 > 1 > 697-704

The presence of sulfur in diesel causes environmental pollution and corrosion of engines. In order to minimize the consequences of this pollutant, Brazilian laws established the maximum of sulfur content that diesel fuel may contain. To meet these requirements, diesel with a maximum sulfur concentration equal to 10 mg kg⁻¹ (diesel S10) has been widely marketed in the country. The reduction in sulfur...

article

Thermogravimetry study of the ester interchange of sunflower oil using Mg/Al layered double hydroxides (LDH) impregnated with potassium

Ana C. F. Coriolano, Aline A. Alves, Renkel A. Araujo, Regina C. O. B. Delgado, more

Journal of Thermal Analysis and Calorimetry > 2017 > 127 > 3 > 1863-1867

Mg/Al layered double hydroxides (LDH) containing KI were synthesized and tested as basic heterogeneous catalysts for transesterification of sunflower oil, in order to obtain biodiesel. The process was carried out using reflux with 15:1 molar ratio of methanol to sunflower oil, and catalyst concentration of 2 mass%. The characterization of sunflower oil and biodiesel was accomplished according to ASTM...

article

Catalytic cracking of LDPE over nanocrystalline HZSM-5 zeolite prepared by seed-assisted synthesis from an organic-template-free system

Aneliése L. Figueiredo, Antonio S. Araujo, María Linares, Ángel Peral, more

Journal of Analytical and Applied Pyrolysis > 2016 > 117 > C > 132-140

The catalytic cracking of low density polyethylene (LDPE) was accomplished using nanocrystalline HZSM-5 zeolites. Nanocrystalline ZSM-5 zeolites were synthesized by a seed-assisted method from an organic-template-free system employing three different seeding strategies: two of these strategies based on aqueous clear solutions containing the ZSM-5 precursors (silanized and non-silanized) and the third...

article

Kinetic study of thermal and catalytic pyrolysis of Brazilian heavy crude oil over mesoporous Al-MCM-41 materials

Ana C. F. Coriolano, Aline A. A. Oliveira, Rafaely A. F. Bandeira, Valter J. Fernandes, more

Journal of Thermal Analysis and Calorimetry > 2015 > 119 > 3 > 2151-2157

This study aimed to evaluate the activity of Al-MCM-41, as mesoporous heterogeneous catalyst, for the thermal and catalytic degradation of a Brazilian heavy crude oil (14°API), via thermogravimetry. The American Petroleum Institute gravity (°API) is a measure of how light of heavy petroleum is when compared to water. The API value is an inverse measure of the relative density of a petroleum...

article

Pyrolysis of atmospheric residue of petroleum (ATR) using AlSBA-15 mesoporous material by TG and Py-GC/MS

Kesia K. V. Castro, Aneliese L. Figueiredo, Amanda D. Gondim, Ana C. F. Coriolano, more

Journal of Thermal Analysis and Calorimetry > 2014 > 117 > 2 > 953-959

The mesoporous material AlSBA-15 with Si/Al molar ratio of 25 was synthesized by the hydrothermal method and characterized by X-ray diffraction and nitrogen adsorption. This is a promising material in the field of catalysis, particularly for petroleum refining, since their mesopores facilitate the accessibility of large hydrocarbon molecules to the active sites of AlSBA-15, producing light hydrocarbons...

article

Analysis of thermal and oxidative stability of biodiesel from Jatropha curcas L. and beef tallow

Erisandro S. Silva, Marta M. Conceição, Eduardo H. S. Cavalcanti, Valter J. Fernandes, more

Journal of Thermal Analysis and Calorimetry > 2013 > 113 > 2 > 437-442

The oxidation of oils and biodiesels occurs due to several factors: the quantity of double bonds and the presence of allylic and bis-allylic hydrogens. Esters (biodiesel) that have large amounts of unsaturated fatty acids are more susceptible to oxidation than saturated. The aim of this work was to analyze the thermal and oxidative stability of ethyl biodiesel from Jatropha curcas L. and beef tallow...

article

Synthesis of alumina impregnated with potassium iodide catalyst for biodiesel production from rice bran oil

João P.C. Evangelista, Thiago Chellappa, Ana C.F. Coriolano, Valter J. Fernandes, more

Fuel Processing Technology > 2012 > 104 > Complete > 90-95

In this work, a catalyst based on alumina impregnated with potassium iodide was synthesized and tested in the process of transesterification of rice bran oil with methanol. The reaction took place in a reflux system, with a molar ratio of 15:1 methanol:oil. The catalyst was prepared by impregnation of alumina with a solution of KI followed by calcination at 773K for 3h. The effect of concentration...

article

Thermal catalytic cracking of buriti oil (Mauritia flexuosa L.) over LaSBA-15 mesoporous materials

Geraldo E. Luz, Anne G.D. Santos, Ana C.R. Melo, Ricardo M. Oliveira, more

Fuel Processing Technology > 2011 > 92 > 10 > 2099-2104

In order to obtain a fuel with properties similar to diesel, the thermal catalytic cracking (TCC) of buriti oil was accomplished over LaSBA-15 mesoporous materials. In function of the Lewis acid sites and the unidirectional pore system of the LaSBA-15, this material presented good deoxygenating activity for TCC of the oil, resulting in a reduction of the oxygenate content in the organic liquid (OL)...

article

Caffeic Acid: An Efficient Antioxidant for Soybean Biodiesel Contaminated with Metals

Nataly A. Santos, Sarah S. Damasceno, Pedro H. M. de Araújo, Verônica C. Marques, more

Energy & Fuels > 2011 > 25 > 9 > 4190 - 4194

article

Kinetic behavior of sunflower oil pyrolysis over mesoporous materials

Ana C.R. Melo, Antonio S. Araujo, Edjane F.B. Silva, Ricardo M. Oliveira, more

Fuel Processing Technology > 2011 > 92 > 7 > 1340-1344

Mesoporous materials type MCM-41 and AlMCM-41 were synthesized by the hydrothermal method and characterized by X-ray diffraction and nitrogen adsorption. Analyses have showed that the hexagonal structures of the materials were preserved and the template completely removed. In this work, the degradation of pure sunflower oil and mixed with mesoporous materials were evaluated. A kinetic study of the...

article

Model-free kinetics applied for the removal of CTMA⁺ and TPA⁺ of the nanostructured hybrid AlMCM-41/ZSM-5 material

Maria J. F. Costa, Antonio S. Araujo, Edjane F. B. Silva, Mirna F. Farias, more

Journal of Thermal Analysis and Calorimetry > 2011 > 106 > 3 > 767-771

The nanostructured hybrid AlMCM-41/ZSM-5 composite was synthesized starting from a hydrogel with molar composition SiO₂:0.32Na₂O:0.03Al₂O₃:0.20TPABr:0.16CTMABr:55H₂O. The cetyltrimethylammonium bromide (CTMABr) and tetrapropylammonium bromide (TPABr) were used as templates. The above mentioned material presents morphological properties with specific characteristics, such as the surface area of the...

article

Effect of the AL-MCM-41 catalyst on the catalytic pyrolysis of atmospheric petroleum residue (ATR)

Késia K. V. Castro, Ana A. D. Paulino, Edjane F. B. Silva, Thiago Chellappa, more

Journal of Thermal Analysis and Calorimetry > 2011 > 106 > 3 > 759-762

Thermogravimetry (TG) was used in this study to evaluate thermal and catalytic pyrolysis of Atmospheric Petroleum Residue (ATR) which can be found in the state of Rio Grande do Norte/Brazil, after a process of atmospheric distillation of petroleum. The utilized sample in the process of catalytic pyrolysis was Al-MCM-41, a mesoporous material. The procedures for obtaining the thermogravimetric curves...

article

Kinetic study of low density polyethylene degradation on the silicoaluminophospate SAPO-11

Edjane F. B. Silva, Marcílio P. Ribeiro, Luzia P. F. C. Galvão, Valter J. Fernandes, more

Journal of Thermal Analysis and Calorimetry > 2011 > 103 > 2 > 465-469

Degradation of low density polyethylene (LDPE) was studied for the pure polymer and mixed with silicoaluminophosphate SAPO-11 catalyst. SAPO-11 was synthesized by hydrothermal method using di-isoprolpylamine as structure template, and characterized by XRD and SEM. From X-ray diffraction, it was observed that SAPO-11 was obtained with high crystallinity. Using the model-free kinetics, proposed by Vyazovkin,...

article

Kinetic study of degradation of heavy oil over MCM-41

Edjane F. B. Silva, Marcílio P. Ribeiro, Ana C. F. Coriolano, Ana C. R. Melo, more

Journal of Thermal Analysis and Calorimetry > 2011 > 106 > 3 > 793-797

Thermogravimetry was applied in order to investigate the catalytic degradation of heavy oil (15.4^oAPI) over silica-based MCM-41 mesoporous molecular sieve. This material was synthesised by the hydrothermal method, using cetyltrimethylammonium bromide as organic template. The physicochemical characterization by nitrogen adsorption, X-ray diffraction, and thermogravimetry, showed that the obtained material...

article

Thermal stability evaluation of methylic biodiesel obtained for different oilseeds

Hellyda K. T. A. Silva, Thiago Chellappa, Fabíola C. Carvalho, Edjane F. B. Silva, more

Journal of Thermal Analysis and Calorimetry > 2011 > 106 > 3 > 731-733

Biodiesel is defined as a mixture of mono- or di-alquil esters of vegetable oil or animal fats. During long-term storage, oxidation caused by contact with air (autoxidation) presents a legitimate concern in relation to monitoring and maintaining fuel quality. Extensive oxidative degradation may compromise the quality by adversely affecting kinematic viscosity, acid value, or peroxide value. The oxidation...

article

Evaluation of the thermal stability of biodiesel blends of castor oil and passion fruit

Rosiane M. C. Farias, Marta M. Conceição, Roberlúcia A. Candeia, Marta C. D. Silva, more

Journal of Thermal Analysis and Calorimetry > 2011 > 106 > 3 > 651-655

The diversity of raw materials and technological routes employed in the biodiesel production has resulted in products with different chemical properties. This non-uniformity in the biodiesel composition may influence to the fuel quality. The aim of this study was to evaluate biodiesel blends of passion fruit and castor oil in different proportions and their thermal stability. Biodiesel blends of passion...

Publication date

Set your own date range

INFONA - science communication portal

Search results for: Valter J. Fernandes

Thermogravimetry applied for catalytic degradation of atmospheric residue of petroleum on mesoporous catalyst

Improved thermogravimetric system for processing of oil sludge using HY zeolite catalyst

Synthesis characterization and acid properties of niobium-containing MCM-41

Development of HZSM-12 zeolite for catalytic degradation of high-density polyethylene

Evaluation of the thermal properties of diesel oil with low sulfur content

Thermogravimetry study of the ester interchange of sunflower oil using Mg/Al layered double hydroxides (LDH) impregnated with potassium

Catalytic cracking of LDPE over nanocrystalline HZSM-5 zeolite prepared by seed-assisted synthesis from an organic-template-free system

Kinetic study of thermal and catalytic pyrolysis of Brazilian heavy crude oil over mesoporous Al-MCM-41 materials

Pyrolysis of atmospheric residue of petroleum (ATR) using AlSBA-15 mesoporous material by TG and Py-GC/MS

Analysis of thermal and oxidative stability of biodiesel from Jatropha curcas L. and beef tallow

Synthesis of alumina impregnated with potassium iodide catalyst for biodiesel production from rice bran oil

Thermal catalytic cracking of buriti oil (Mauritia flexuosa L.) over LaSBA-15 mesoporous materials

Caffeic Acid: An Efficient Antioxidant for Soybean Biodiesel Contaminated with Metals

Kinetic behavior of sunflower oil pyrolysis over mesoporous materials

Model-free kinetics applied for the removal of CTMA⁺ and TPA⁺ of the nanostructured hybrid AlMCM-41/ZSM-5 material

Effect of the AL-MCM-41 catalyst on the catalytic pyrolysis of atmospheric petroleum residue (ATR)

Kinetic study of low density polyethylene degradation on the silicoaluminophospate SAPO-11

Kinetic study of degradation of heavy oil over MCM-41

Thermal stability evaluation of methylic biodiesel obtained for different oilseeds

Evaluation of the thermal stability of biodiesel blends of castor oil and passion fruit

Filter options

Publication date

Keywords

Data set

Journal

INFONA - science communication portal

Search results for: Valter J. Fernandes

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Keywords

Data set

Journal

Reporting an error / abuse

Sending the report failed

Accessibility options