Oxygen-Induced Enhancement in Low-Temperature Dechlorination of PVC: An Experimental and DFT Study on the Oxidative Pyrolysis Process

2021 ◽  
Vol 9 (7) ◽  
pp. 2835-2843
Author(s):  
Linzheng Wang ◽  
Rui-zhi Zhang ◽  
Ruiqu Deng ◽  
Yong-hao Luo
Author(s):  
Emma Jakab ◽  
Zoltán Sebestyén ◽  
Bence Babinszki ◽  
Eszter Barta-Rajnai ◽  
Zsuzsanna Czégény ◽  
...  

SummaryThe thermo-oxidative decomposition of lovage (Levisticum officinale) and davana (Artemisia pallens) essential oils has been studied by pyrolysis-gas chromatography/mass spectrometry in 9% oxygen and 91% nitrogen atmosphere at 300 °C to simulate low-temperature tobacco heating conditions. Both lovage and davana oils contain numerous chemical substances; the main components of both oils are various oxygen-containing compounds. Isobenzofuranones are the most important constituents of lovage oil, and their relative intensity changed significantly during oxidative pyrolysis. (Z)-ligustilide underwent two kinds of decomposition reactions: an aromatization reaction resulting in the formation of butylidenephthalide and the scission of the lactone ring with the elimination of carbon dioxide or carbon monoxide. Davanone is the main component of davana oil, which did not decompose considerably during low-temperature oxidative pyrolysis. However, the relative yield of the second most intensive component, bicyclogermacrene, reduced markedly due to bond rearrangement reactions. Davana ether underwent oxidation reactions leading to the formation of various furanic compounds. The changes in the composition of both essential oils could be interpreted in terms of bond splitting, intramolecular rearrangement mechanisms and oxidation reactions of several constituents during low-temperature oxidative pyrolysis. The applied thermo-oxidative method was found to be suitable to study the stability of the essential oils and monitor the decomposition products under simulated tobacco heating conditions. In spite of the complicated composition of the essential oils, no evidence for interaction between the oil components was found. [Beitr. Tabakforsch. Int. 29 (2020) 27–43]


2020 ◽  
Vol 493 ◽  
pp. 111044
Author(s):  
Jin Jiang ◽  
Ruizi Zheng ◽  
Yong Jia ◽  
Lina Guo ◽  
Mingyan Huang ◽  
...  

Data ◽  
2020 ◽  
Vol 5 (2) ◽  
pp. 48 ◽  
Author(s):  
Kacper Świechowski ◽  
Ewa Syguła ◽  
Jacek A. Koziel ◽  
Paweł Stępień ◽  
Szymon Kugler ◽  
...  

New technologies to valorize refuse-derived fuels (RDFs) will be required in the near future due to emerging trends of (1) the cement industry’s demands for high-quality alternative fuels and (2) the decreasing calorific value of the fuels derived from municipal solid waste (MSW) and currently used in cement/incineration plants. Low-temperature pyrolysis can increase the calorific value of processed material, leading to the production of value-added carbonized solid fuel (CSF). This dataset summarizes the key properties of MSW-derived CSF. Pyrolysis experiments were completed using eight types of organic waste and their two RDF mixtures. Organic waste represented common morphological groups of MSW, i.e., cartons, fabrics, kitchen waste, paper, plastic, rubber, PAP/AL/PE composite packaging (multi-material packaging also known as Tetra Pak cartons), and wood. The pyrolysis was conducted at temperatures ranging from 300 to 500 °C (20 °C intervals), with a retention (process) time of 20 to 60 min (20 min intervals). The mass yield, energy densification ratio, and energy yield were determined to characterize the pyrolysis process efficiency. The raw materials and produced CSF were tested with proximate analyses (moisture content, organic matter content, ash content, and combustible part content) and with ultimate analyses (elemental composition C, H, N, S) and high heating value (HHV). Additionally, differential scanning calorimetry (DSC) and thermogravimetric analyses (TGA) of the pyrolysis process were performed. The dataset documents the changes in fuel properties of RDF resulting from low-temperature pyrolysis as a function of the pyrolysis conditions and feedstock type. The greatest HHV improvements were observed for fabrics (up to 65%), PAP/AL/PE composite packaging (up to 56%), and wood (up to 46%).


ChemCatChem ◽  
2017 ◽  
Vol 9 (10) ◽  
pp. 1837-1844 ◽  
Author(s):  
David S. McGuinness ◽  
Jim Patel ◽  
Mohamad Hassan Amin ◽  
Suresh K. Bhargava

1998 ◽  
Vol 13 (4) ◽  
pp. 834-836
Author(s):  
T. Manabe ◽  
I. Yamaguchi ◽  
W. Kondo ◽  
T. Kumagai ◽  
S. Mizuta

Epitaxially grown LiNbO3 thin films were prepared on sapphire(012) (R-plane) substrates by a dipping-pyrolysis process using two kinds of lithium sources, i.e., Li-2-ethylhexanoate and Li-trifluoroacetate, which are pyrolyzed in air to Li2CO3 and LiF, respectively. Crystallization temperature and alignment of LiNbO3 films on sapphire(012) were found to depend greatly on the Li sources. Dominantly [100]-oriented epitaxial LiNbO3 films were crystallized at around 600 °C using 2-ethylhexanoate, whereas dominantly [012]-oriented epitaxial LiNbO3 films resulted at a temperature as low as 400 °C using trifluoroacetate.


2014 ◽  
Vol 16 (12) ◽  
pp. 5640-5648 ◽  
Author(s):  
Ping Wu ◽  
Pan Du ◽  
Hui Zhang ◽  
Chenxin Cai

We demonstrate by a DFT study that graphdiyne is a good, low-cost, and metal-free catalyst for low-temperature CO oxidation.


2004 ◽  
Vol 83 (2) ◽  
pp. 137-148 ◽  
Author(s):  
Hidetoshi YAMAMOTO ◽  
Masamichi ASANO ◽  
Tatsuya IKEDA ◽  
Tomomasa TAGUCHI ◽  
Takao HARA

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