scholarly journals Catalytic effect of alkali and alkaline earth metals on fast pyrolysis pre‐treatment of agricultural waste

2021 ◽  
Author(s):  
Angel Alcazar‐Ruiz ◽  
María Luz Ortiz ◽  
Luz Sanchez‐Silva ◽  
Fernando Dorado
Keyword(s):  
Alkaline Earth ◽  
Catalytic Effect ◽  
Agricultural Waste ◽  
Fast Pyrolysis ◽  
Alkaline Earth Metals ◽  
Pre Treatment

scholarly journals Combined organic acid leaching and torrefaction as pine wood pretreatment before fast pyrolysis

2019 ◽  
Vol 23 (Suppl. 5) ◽  
pp. 1403-1411 ◽  
Author(s):  
Roel Westerhof ◽  
Stijn Oudenhoven ◽  
Xun Hu ◽  
Swaaij van ◽  
Sascha Kersten
Keyword(s):  
Alkaline Earth ◽  
Produced Water ◽  
Acetic Acid Solution ◽  
Fast Pyrolysis ◽  
Acid Leaching ◽  
Wood Particle ◽  
Alkaline Earth Metals ◽  
Pine Wood ◽  
Pre Treatment ◽  
Pyrolytic Lignin

Reducing pine wood particle size is beneficial for acid leaching (shorter leaching time, smaller equipment size) and also for pyrolysis (low pyrolysis time, high oil and sugar yields). Torrefaction helps to improve the energy efficiency of grinding. However, it is not well established whether alkali and alkaline earth metals can still be removed effectively, after torrefaction, by leaching with an acetic acid solution, while keeping high oil and sugar yields. To investigate this, an experimental study was carried out combining torrefaction (290?C, 20 minutes) and subsequently acid leaching of pine wood as pretreatment step before fast pyrolysis of the feedstock at 530?C. The oil, char, gas, water, pyrolytic lignin, light oxygenates and levoglucosan yields were compared with the results obtained from fast pyrolysis of untreated pine wood and acid leached pine wood at 530?C. In addition, pyrolysis vapors were condensed step-wise into two distinguished fractions (condensation T = 80?C) to increase the levoglucosan concentration up to 45 wt.% with or without applying torrefaction as pretreatment. Intra-particle reactions during torrefaction are more profound in the presence of alkali and alkaline earth metals. Cellulose and lignin derived products (e.g. levolucosan (~0.2 kg/kg pine wood) and pyrolytic lignin (~0.11 kg/kg pine wood) were not affected by the torrefaction pre-treatment of acid leached pine wood. In general, torrefaction of acid leached pine wood followed by fast pyrolysis showed similar total organics, char, gas, light oxygenates and produced water yields compared to fast pyrolysis of acid leached pine wood. Contrary, when acid leaching is applied after torrefaction the organics (dry bio-oil) and light oxygenates yields are quite comparable to the results of untreated pine wood fast pyrolysis.

Catalytic Effect of Alkali and Alkaline Earth Metals in Lignin Pyrolysis: A Density Functional Theory Study

2020 ◽  
Vol 34 (8) ◽  
pp. 9734-9740 ◽  
Author(s):  
Keunhong Jeong ◽  
Hye Jin Jeong ◽  
Gunwoo Lee ◽  
Sang Hoon Kim ◽  
Kwang Ho Kim ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Alkaline Earth ◽  
Catalytic Effect ◽  
Alkaline Earth Metals ◽  
Density Functional Theory Study ◽  
Functional Theory

Kinetic understanding of the effect of Na and Mg on pyrolytic behavior of lignin using a distributed activation energy model and density functional theory modeling

2019 ◽  
Vol 21 (5) ◽  
pp. 1099-1107 ◽  
Author(s):  
Kwang Ho Kim ◽  
Keunhong Jeong ◽  
Seung-Soo Kim ◽  
Robert C. Brown
Keyword(s):  
Activation Energy ◽  
Density Functional Theory ◽  
Density Functional ◽  
Alkaline Earth ◽  
Catalytic Effect ◽  
Energy Model ◽  
Alkaline Earth Metals ◽  
Distributed Activation Energy Model ◽  
Functional Theory ◽  
Naturally Occurring

The catalytic effect of Na and Mg, naturally occurring alkali and alkaline earth metals, on lignin pyrolysis was systematically analyzed using a distributed activation energy model and computational modeling.

Effect of Alkali and Alkaline Earth Metals on in-Situ Catalytic Fast Pyrolysis of Lignocellulosic Biomass: A Microreactor Study

2016 ◽  
Vol 30 (4) ◽  
pp. 3045-3056 ◽  
Author(s):  
Ravishankar Mahadevan ◽  
Sushil Adhikari ◽  
Rajdeep Shakya ◽  
Kaige Wang ◽  
David Dayton ◽  
...  
Keyword(s):  
Lignocellulosic Biomass ◽  
Alkaline Earth ◽  
Fast Pyrolysis ◽  
Alkaline Earth Metals ◽  
Catalytic Fast Pyrolysis

Catalytic effect of alkali and alkaline earth metals in different occurrence modes in Zhundong coals

2018 ◽  
Vol 13 (3) ◽  
pp. e2190 ◽  
Author(s):  
Dingcheng Liang ◽  
Qiang Xie ◽  
Huabing Zhou ◽  
Mingshun Yang ◽  
Junya Cao ◽  
...  
Keyword(s):  
Alkaline Earth ◽  
Catalytic Effect ◽  
Alkaline Earth Metals
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