A5088766369- Zeolite Catalysis and Synthesis
- Mesoporous Materials and Catalysis
- Catalysis and Hydrodesulfurization Studies
- Carbon Dioxide Capture Technologies
- Catalytic Processes in Materials Science
- Polymer Nanocomposites and Properties
- Catalysis for Biomass Conversion
- Polymer crystallization and properties
- Membrane Separation and Gas Transport
- Recycling and Waste Management Techniques
- Metal-Organic Frameworks: Synthesis and Applications
- Catalysis and Oxidation Reactions
- Thermal and Kinetic Analysis
- Chemical Synthesis and Characterization
- Nanomaterials for catalytic reactions
- Concrete and Cement Materials Research
- Layered Double Hydroxides Synthesis and Applications
- Catalysts for Methane Reforming
- Flame retardant materials and properties
- Chemical Looping and Thermochemical Processes
Universidade Federal de Sergipe
2018-2024
Universidade Federal de Campina Grande
2021
Abstract The thermo-catalytic degradation of polyethylene (PE) and ultra-high molecular weight (UHMWPE) was studied in the presence zeolites (ZSM-5, ZSM-22, ferrierite) with different pore systems textural properties. were physically mixed polymers proportion 30 wt% submitted to thermogravimetric analysis at heating rates 5, 10, 20, °C.min-1. activation energy process determined using Flynn-Wall-Ozawa method. addition has considerably reduced temperature degradation. ZSM-22 demonstrated...
This paper discussed the synthesis of LTA zeolite from Pinheiro clay (PIN) aiming for adsorption CO2. To obtain LTA-PIN zeolite, PIN was submitted to acid treatment, followed by calcination and hydrothermal treatment. These treatments promoted reorganization crystalline structure PIN, leading with 95.79% purity confirmed XRD, SEM, XRF, FTIR results. The performance similar one standard zeolite. CO2 zeolites could be properly described pseudo-second-order kinetic Freundlich isotherm models,...
The synthesis of SSZ-13 was studied by evaluating the influence two types crystallization seeds with CHA structure (S1 prepared in fluoride medium and S2 conversion zeolite Y), SiO2/Al2O3 (28, 40, 60 100) OH/SiO2 (0.6 0.8) ratios. Choline chloride used as structure-directing agent crystallizations occurred at 140 ºC from 24 to 96 h. S1 led coexistence zeolites P, while promoted all ratios = 0.8, formation pure after samples are formed clusters crystals cuboid-like morphology exhibited...
The synthesis of ZSM-22 zeolite has been extensively studied due to its properties form selectivity, acidity and hydrothermal stability, which is applied in important reactions the areas petroleum refining petrochemicals. In view this, present work different approaches using: 1-diaminohexane as a structure directing agent, (ii) methanol seed crystals, (iii) aging gel with addition polymer, surfactant silane (iv) starch, calcium carbonate silanized silica subsequent desilication. Thus,...
The hydrothermal synthesis of MCM-22 zeolite was investigated in reaction systems with different proportions sodium and potassium cations. content R, defined as the molar ratio between total inorganic cations amounts mixture, varied from 0 to 0.9, keeping constant cationic concentration alkalinity system. materials were characterized by X-ray diffraction (XRD), N2 adsorption/desorption scanning electron microscopy (SEM). K+ ions favored formation when 45% replaced potassium, reducing time...
Neste trabalho foi preparado o precursor (P)MCM-22 a partir do método hidrotérmico em sistema estático e realizadas modificações térmica, deslaminação acidificação. Esse estudo tem finalidade otimizar modificação que promove desorganização das lamelas zeolítico torna os sítios ativos mais acessíveis. O sob condições hidrotérmica com temperatura de 150 oC tempo cristalização 7 dias. processo realizado via intumescimento lamelar CTABr posterior esfoliação por sonicação. Foram utilizadas...