scholarly journals Thermal decomposition behavior and kinetics for pyrolysis and catalytic pyrolysis of Douglas fir

RSC Advances ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 2196-2202 ◽  
Author(s):  
Lu Wang ◽  
Hanwu Lei ◽  
Jian Liu ◽  
Quan Bu
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Thermogravimetric Analysis ◽  
Catalytic Pyrolysis ◽  
Douglas Fir ◽  
Thermal Decomposition Behavior ◽  
Decomposition Behavior

Investigation of non-catalytic and catalytic pyrolysis of DF by thermogravimetric analysis revealed that the application of ZSM-5 reduced the activation energy.

scholarly journals Thermal degradation behaviour of some polydithiooxamide metal complexes

2006 ◽  
Vol 31 (1) ◽  
pp. 45-52 ◽  
Author(s):  
H. Al-Maydama ◽  
A. El-Shekeil ◽  
M. A. Khalid ◽  
A. Al-Karbouly
Keyword(s):  
Thermal Decomposition ◽  
Thermogravimetric Analysis ◽  
Integral Method ◽  
Valence Shell ◽  
Degradation Behaviour ◽  
Thermal Stabilities ◽  
Electron Pairs ◽  
Thermal Decomposition Behavior ◽  
The Difference ◽  
Decomposition Behavior

The thermal decomposition behavior of the Fe(II), Co(II), Ni(II) and Zn(II) complexes of polydithiooxamide has been investigated by thermogravimetric analysis (TGA) at a heating rate of 20°C min-1 under nitrogen. The Coats-Redfern integral method is used to evaluate the kinetic parameters for the successive steps in the decomposition sequence observed in the TGA curves. The processes of thermal decomposition taking place in the four complexes are studied comparatively as the TGA curves indicate the difference in the thermal decomposition behavior of these complexes. The thermal stabilities of these complexes are discussed in terms of repulsion among electron pairs in the valence shell of the central ion and electronegativity effects.

scholarly journals Unexpected thermal decomposition behavior of poly(N-vinylimidazole)-l-poly(tetrahydrofuran) amphiphilic conetworks, a class of chemically forced blends

RSC Advances ◽  
2015 ◽  
Vol 5 (23) ◽  
pp. 17413-17423 ◽  
Author(s):  
Csaba Fodor ◽  
János Bozi ◽  
Marianne Blazsó ◽  
Béla Iván
Keyword(s):  
Mass Spectrometry ◽  
Thermal Decomposition ◽  
Thermogravimetric Analysis ◽  
Chemical Processes ◽  
Thermal Decomposition Behavior ◽  
Decomposition Behavior

The underlying chemical processes of the unexpected thermal decomposition behavior of poly(N-vinylimidazole)-l-poly(tetrahydrofuran) amphiphilic conetworks were investigated by thermogravimetric analysis and thermogravimetry-mass spectrometry.

scholarly journals Thermal Decomposition Behavior of Melaminium Benzoate Dihydrate

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
N. Kanagathara ◽  
M. K. Marchewka ◽  
K. Pawlus ◽  
S. Gunasekaran ◽  
G. Anbalagan
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Effective Activation Energy ◽  
Preexponential Factor ◽  
Effective Activation ◽  
Heating Rates ◽  
Monoclinic System ◽  
Model Free ◽  
Thermal Decomposition Behavior ◽  
Decomposition Behavior

Crystals of melaminium benzoate dihydrate (MBDH) have been grown from aqueous solution by slow solvent evaporation method at room temperature. Powder X-ray diffraction analysis confirms that MBDH crystallizes in the monoclinic system (C2/c). Thermal decomposition behavior of MBDH has been studied by thermogravimetric analysis at three different heating rates: 10, 15, and 20°C/min. Nonisothermal studies of MBDH revealed that the decomposition occurs in three stages. The values of effective activation energy (Ea) and preexponential factor (ln A) of each stage of thermal decomposition for all heating rates were calculated by model free methods: Arrhenius, Flynn-Wall, Friedman, Kissinger, and Kim-Park methods. A significant variation of effective activation energy (Ea) with conversion (α) indicates that the process is kinetically complex. The linear relationship between the A and Ea values was established (compensation effect). Avrami-Erofeev model (A3), contracting cylinder (R2), and Avrami-Erofeev model (A4) were accepted by stages I, II, and III, respectively. DSC has also been performed.

The Thermal Decomposition Behavior of Graphene Oxide/HMX Composites

2015 ◽  
Vol 645-646 ◽  
pp. 110-114 ◽  
Author(s):  
Gui Yu Zeng ◽  
Jian Hua Zhou ◽  
Cong Mei Lin
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Graphene Oxide ◽  
Interlayer Space ◽  
Decomposition Process ◽  
Thermal Decomposition Process ◽  
Hummers Method ◽  
Thermal Decomposition Behavior ◽  
Decomposition Behavior ◽  
Decomposition Activation Energy

Graphene oxide (GO) was prepared by Hummers method and GO/1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) composite was prepared via an ultrasonic compounding method. The structure of GO was characterized using XRD and SEM, the thermal decomposition of HMX and GO/HMX composite was analyzed by DSC/TG test. The results show that interlayer space of GO increases markedly, the thermal decomposition process of HMX can be promoted with the nanolayer structure of GO, resulting the reduced thermal decomposition activation energy of about 50 kJ/mol with 1% GO.

scholarly journals Study on Blending of Wall Material of the Nonel Tube by CSW/PE-g-MAH

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Hong-wei Li ◽  
Bin-bin Zhang ◽  
Ji-nian Yang ◽  
Huan Li ◽  
Ji-chang Gui ◽  
...  
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Composite System ◽  
Interfacial Structure ◽  
Wall Material ◽  
Thermal Decomposition Behavior ◽  
Decomposition Behavior ◽  
Calcium Sulfate Whiskers ◽  
Melting And Crystallization ◽  
Decomposition Activation Energy

In order to improve the strength and resistance of ordinary nonel tubes, calcium sulfate whiskers (CSW, treated with silane coupling agent) and maleic anhydride grafted polyethylene (PE-g-MAH) are used to control the wall material of the nonel tube that the blending of the low-density polyethylene was enhanced. The effects of mass fraction of CSW or PE-g-MAH on the tensile properties, interfacial structure, melting and crystallization characteristics, and thermal decomposition behavior of the composite system were studied, and the thermal decomposition kinetics were calculated. The results show that, relative to pure LDPE, the strength of LDPE/CSW (85/15) is increased by 7.58%, and the strength of LDPE/CSW/PE-g-MAH (84/15/1) is increased by 7.58%. The addition of CSW or PE-g-MAH has gradually changed the fracture mode of the LDPE matrix. Thermal analysis shows that CSW can reduce the crystallinity of LDPE. The melting and crystallization characteristics of LDPE/CSW/PE-g-MAH composites have little effect, but the thermal decomposition stability is improved. The kinetic analysis showed that the reaction order (n) was around 1, CSW could improve LDPE/CSW thermal decomposition activation energy, and PE-g-MAH increased the thermal decomposition activation energy of LDPE/CSW/PE-g-MAH.

scholarly journals Thermal Decomposition Kinetics of Poly(L-lactic acid) after Heat Treatment

2015 ◽  
Vol 9 (1) ◽  
pp. 28-32
Author(s):  
Yan-Hua Cai ◽  
Yun-Chen Xie ◽  
Ying- Tang ◽  
Li-Sha Zhao
Keyword(s):  
Heat Treatment ◽  
Activation Energy ◽  
Thermal Decomposition ◽  
Lactic Acid ◽  
Decomposition Kinetics ◽  
Thermal Decomposition Kinetics ◽  
Isothermal Heat Treatment ◽  
Order Kinetic ◽  
Thermal Decomposition Behavior ◽  
Decomposition Behavior

Thermal decomposition behavior of Poly(L-lactic acid) (PLLA) and PLLA composites after different heat treatment were investigated using thermogravimetric analysis. Firstly, the thermal decomposition results of neat PLLA showed that the decomposition of PLLA was a first-order kinetic reaction, and thermal decomposition kinetics indicated that the heat treatment significantly affected activation energy of thermal decomposition of PLLA. The measurement results also exhibited that the onset decomposition temperature of PLLA treated below 115°C was lower than that of the pristine PLLA. Then, the effect of additive CaCo3 on the thermal decomposition behavior of PLLA was evaluated. The addition of CaCo3 could significantly improve the crystallization performance of PLLA, but the CaCo3 did not change the decomposition trend of PLLA, and the thermal decomposition behavior of PLLA/CaCo3 composites after isothermal heat treatment was similar to that of PLLA. However, the thermal decomposition activation energy of PLLA/CaCo3 is lower than that of PLLA.

Influence of thermal decomposition behavior of titanium precursors on (Ba,Sr)TiO3 thin films

2001 ◽  
Vol 11 (PR3) ◽  
pp. Pr3-675-Pr3-682 ◽  
Author(s):  
Y. S. Min ◽  
Y. J. Cho ◽  
D. Kim ◽  
J. H. Lee ◽  
B. M. Kim ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Decomposition ◽  
Thermal Decomposition Behavior ◽  
Decomposition Behavior
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