TiO2 with a high sulfate content—thermogravimetric analysis, determination of acid sites by infrared spectroscopy and catalytic activity

2003 ◽  
Vol 85 (1) ◽  
pp. 69-74 ◽  
Author(s):  
Lúcia Kiyomi Noda ◽  
Rusiene Monteiro de Almeida ◽  
Norberto Sanches Gonçalves ◽  
Luiz Fernando Dias Probst ◽  
Oswaldo Sala
Keyword(s):  
Catalytic Activity ◽  
Infrared Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Acid Sites ◽  
Sulfate Content ◽  
High Sulfate ◽  
Analysis Determination

Removal of methylene blue by orange and uvaia seeds

2015 ◽  
Vol 3 (3) ◽  
pp. 236-251
Author(s):  
Bianca Mesquita Coelho Botrel ◽  
Zuy Maria Magriotis ◽  
Adelir Aparecida Saczk ◽  
Sabrina Mesquita Coelho ◽  
Priscila Ferreira De Sales
Keyword(s):  
Methylene Blue ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Contact Time ◽  
Low Cost ◽  
Acid Sites ◽  
Maximum Adsorption Capacity ◽  
Elemental Chemical Analysis

In this study, the adsorption behavior of methylene blue (MB) was investigated using orange seed (OS) and uvaia seed (US) as low cost adsorbents. These materials were characterized using FTIR (Fourier transform infrared spectroscopy), elemental chemical analysis (CHNO), thermogravimetric analysis (TGA), zeta potential, specific surface area and a test for determination of acid sites. The parameters evaluated in the kinetic study of adsorption were contact time, initial dye concentration, mass of adsorbent and pH. The adsorption of MB onto OS and US samples could be explained by Elovich ?s kinetic model. The experimental isotherms data, carried out at the temperatures of 25°C, 35°C, 45°C and 55°C, were better represented by Sips. It was verified that the adsorption was spontaneous and endothermic according to the thermodynamic parameters ?G°, ?H ° and ?S ° evaluated. The OS and US maximum adsorption capacity at the temperature of 25°C was 38 mg g-1 and 48 mg g-1 , respectively. The reuse tests performed at three subsequent times showed that there was no significant decrease regarding the materials efficiency, therefore emphasizing its viability as biosorbents.

The Characterization of Hydrocarbon Intermediates in H-ZSM-5

1987 ◽  
Vol 111 ◽  
Author(s):  
T. J. Gricus Kofke ◽  
R. J. Gorte ◽  
W. E. Farneth
Keyword(s):  
Infrared Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Acid Site ◽  
Adsorbed Molecule ◽  
Temperature Programmed Desorption ◽  
Acid Sites ◽  
Adsorption State ◽  
Brönsted Acid ◽  
Temperature Programmed

AbstractWe have examined the adsorption of simple alcohols and 2-propanamine on H-ZSM-5 zeolites with Si/Al2 ratios between 38 and 520. Thermogravimetric analysis (TGA) demonstrated that most of the molecules display a clearly defined adsorption state corresponding to a coverage of one molecule per Al site. Temperature programmed desorption (TPD) and transmission infrared spectroscopy results for each of the molecules in this 1:1 adsorption state are consistent with adsorption being due to the transfer of a proton from the zeolite to the adsorbed molecule. These results provide additional evidence that carefully prepared H-ZSM-5 is a Bronsted acid, with one acid site per framework Al atom, in which all of the acid sites are identical in strength.

scholarly journals Synthesis, Spectroscopic, Thermal, and Catalytic Properties of Eight New Complexes of Metal(II) Formates or Propionates with Imidazole, Relationship between the Carbon Chain Length and Catalytic Activity

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 142
Author(s):  
Bartłomiej Rogalewicz ◽  
Tomasz Maniecki ◽  
Radosław Ciesielski ◽  
Agnieszka Czylkowska
Keyword(s):  
Fourier Transform ◽  
Catalytic Activity ◽  
Infrared Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Chain Length ◽  
Catalytic Properties ◽  
Absorption Spectrometry ◽  
Carbon Chain ◽  
Carbon Chain Length ◽  
The Relationship

In one of our previously published articles, we reported the synthesis, spectroscopic, thermal, and catalytic properties of four new M(II) acetate (where M = Co, Ni, Cu, Zn) complexes with imidazole. Presented compounds exhibited activity in the reaction on catalytic oxidation of styrene. In this study we have synthesized and investigated properties of analogous compounds, however using formates or propionates of mentioned metal cations instead of acetates. Such an approach allowed us to draw valuable conclusions concerning the relationship between the carbon chain length and catalytic activity, which is an important factor for catalyst modeling. Synthesized compounds have been thoroughly investigated using appropriate analytic techniques: AAS (Atomic Absorption Spectrometry), FTIR (Fourier-Transform Infrared Spectroscopy), and TGA (Thermogravimetric Analysis). Catalytic properties have been studied under the same previous conditions, using GC-FID (GC-chromatograph equipped with FID detector).

scholarly journals RECYCLING OF Eucalipto cloeziana UNDER BIOCHAR DIFFERENT PYROLISIS TEMPERATURES

FLORESTA ◽  
2019 ◽  
Vol 49 (2) ◽  
pp. 199
Author(s):  
Evair Antônio Siebeneichler ◽  
Natália Aragão Figueredo ◽  
Liovando Marciano Costa ◽  
Jairo Tronto
Keyword(s):  
Thermal Stability ◽  
Environmental Management ◽  
Thermal Decomposition ◽  
Thermogravimetric Analysis ◽  
Heating Rates ◽  
Carbon Compounds ◽  
Eucalyptus Cloeziana ◽  
Analysis Determination ◽  
Do So

In the thermal decomposition of the biomass, products which include carbon compounds are generated. Biochar, a by-product of decomposition, has been efficient in retaining carbon, as well for agricultural and environmental management. Thus, the objective of this research is to evaluate the thermal stability and the recalcitrance of eucalyptus-derived bioburden due to different heating rates and pyrolysis temperatures. To do so, biochar were produced from Eucalyptus cloeziana at nine pyrolysis temperatures and three heating rates, and thermogravimetric analysis, determination of C and functional groups by FTIR were performed. Increasing the aromaticity of the biochromes produced, at higher temperatures, results in an increase in their recalcitrance, as demonstrated by the increase in thermal resistance and the oxidation by acid dichromate.

scholarly journals Nano MgO catalyst for chemical depolymerization of polyethylene terephthalate (PET)

2018 ◽  
Vol 16 (36) ◽  
pp. 85-93
Author(s):  
Mohammed A. Alhussain Alzuhairi
Keyword(s):  
Differential Scanning Calorimetry ◽  
Catalytic Activity ◽  
Infrared Spectroscopy ◽  
Reaction Time ◽  
Thermogravimetric Analysis ◽  
Weight Ratio ◽  
Chemical Recycling ◽  
Scanning Calorimetry ◽  
Molecular Masses ◽  
Time Of Reaction

This paper focuses firstly on the production of monomers bis (2-hydroxyethyl) terephthalate (BHET) and oligomers by using two different form of MgO light active and Nano Magnesium oxide with different weight ratio (0.15, 0.25 and 0.5) by using chemical recycling glass condenser at 190 ˚C. The second purpose is to study the effect of catalyst ratio, time of reaction and yield of products of the product. Elemental analysis for Carbon –Hydrogen and Nitrogen (CHN), differential scanning calorimetry (DSC), infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) have been investigated. Results indicated the catalytic activity was found to correlate with surface area; however, LA MgO has shown an exceptional activity, still it is higher than Nano MgO in order to reduce the reaction time till 30 minutes instead of 7 hours without catalyst. The analysis of the thermograms has indicated the presence of various kinds of monomer, dimer and oligomers that are formed during the recycling; this is particularly evident due to new peaks indicating the formation of BHET monomer and oligomer of lower molecular masses.

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