Characteristics of rice husk tar secondary thermal cracking

Zhai, Ming; Wang, Xinyu; Dong, Peng; Qi, Guoli; Huang, Yudong

doi:10.1016/j.energy.2015.10.029

Cited by 48 publications

(17 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…High biooil yield up to 75 % can be obtained under a careful control of process parameters [10][11][12]. Studies on pyrolysis of RH to bio-oil have been carried out by many researchers [13][14][15][16][17][18][19][20][21][22][23][24]. Bio-oil yields between 25 and 38 wt% rich in acid and ketones are mostly recorded during the pyrolysis of RH at around 600°C [15,16,19,[21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Co-pyrolysis of Rice Husk with Underutilized Biomass Species: A Sustainable Route for Production of Precursors for Fuels and Valuable Chemicals

Mohammed

Lim

Kazi

et al. 2016

Waste Biomass Valor

View full text Add to dashboard Cite

In this study, co-pyrolysis of rice husk with underutilized biomass, Napier grass and sago waste was carried out in a fixed bed reactor at 600°C, 30°C/min and 5 L/min nitrogen flowrate. Two-phase bio-oil (organic and aqueous) was collected and characterized using standard analytical techniques. 34.13-45.55 wt% total boil-oil yield was recorded using assorted biomass compared to pure risk husk biomass with 31.51 wt% yield. The organic phase consist mainly benzene derivatives with higher proportion in the oil from the co-pyrolysis process relative to the organic phase from the pyrolysis of the individual biomass while the aqueous phase in all cases was predominantly water, acids, ketones, aldehydes, sugars and traces of phenolics. This study has demonstrated a good approach towards increasing valorization of rice husk in a single reaction step for the production of high grade bio-oil, which can be transformed into fuel and valuable chemicals.

show abstract

Section: Introductionmentioning

confidence: 99%

Co-pyrolysis of Rice Husk with Underutilized Biomass Species: A Sustainable Route for Production of Precursors for Fuels and Valuable Chemicals

Mohammed

Lim

Kazi

et al. 2016

Waste Biomass Valor

View full text Add to dashboard Cite

show abstract

“…As observed from Figure A, tar conversion efficiency improved significantly from 44.4% to 85% when the temperature increases from 600°C to 800°C. That was ascribe to the conversion of long‐chained tar products into light weight gaseous hydrocarbons or other small molecule liquid products through demethylation, intramolecular bridge bonds, and hydrogen bonds breakdown at high temperature . The syngas yield and the volume concentration of four major gases were displayed in Figure B,C.…”

Section: Resultsmentioning

confidence: 69%

“…That was ascribe to the conversion of long-chained tar products into light weight gaseous hydrocarbons or other small molecule liquid products through demethylation, intramolecular bridge bonds, and hydrogen bonds breakdown at high temperature. 47 The syngas yield and the volume concentration of four major gases were displayed in Figure 12 B,C. The total gas yield experienced an upward trend from 0.8 to 1.14 L/g, with the increasing temperature from 600°C up to 800°C, corresponding to the enhanced tar conversion efficiency.…”

Section: Effects Of Temperature On Catalytic Crackingmentioning

confidence: 99%

The influence of preparation method of char supported metallic Ni catalysts on the catalytic performance for reforming of biomass tar

Zhang

2019

Int J Energy Res

View full text Add to dashboard Cite

Summary The char‐supported nickel catalysts prepared by wet impregnation and precipitation‐deposition methods under different nickel loadings and catalytic temperatures for catalytic reforming of rice husk tar were investigated. The influences of preparation methods on the physicochemical properties of catalysts and catalytic activity towards tar conversion and gas yield were studied. The results showed that char‐supported metallic Ni catalysts can be directly used without a reduction process because of carbon thermal reaction during calcination. The preparation method had a significant influence on the porosity and Ni dispersion of catalysts. The addition of Ni to char improved the specific surface area from 60 m2 g−1 to 346.8 m2 g−1 because of activation effect of nickel nitrate on char pore structure. The precipitation‐deposition method produced higher surface area, smaller Ni nanoparticulates with more corner and step sites, as well as more concentrated size distribution than those of wet impregnation method, leading to higher catalytic activity, in terms of high tar conversion efficiency (83%) and increasing syngas yield. The selectivity to phenols and naphthalene for precipitation‐deposited catalysts was strengthened, and the relative content of heavy tars was decreased remarkably. The increasing H2 yield and concentration were indicative of efficient conversion of macromolecular organic matters into small molecules gases. In addition, the precipitation‐deposited catalyst exhibited weaker Ni sintering after reaction. The catalytic cracking temperature of 800°C and Ni loading of 10 wt% exhibited the best catalytic effects on gas distribution and tar conversion.

show abstract

“…The uncertainty estimation of kinetic parameters, which will result in a difference between the estimated product yields and the practical values, may be caused by heating dynamics in the experiment or the absence of secondary charring reactions in the kinetic studies [22]. Lately, some scholars modified the kinetic scheme of biomass pyrolysis to include secondary charring reactions [22][23][24]. However, the kinetic studies on the secondary charring reactions in the multi-component competitive scheme are rare.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study on the Pyrolysis of Medium Density Fiberboard: Effects of Secondary Charring Reactions

et al. 2018

View full text Add to dashboard Cite

The reaction models employed in the kinetic studies of biomass pyrolysis generally do not include the secondary charring reactions. The aim of this work is to propose an applicable kinetic model to characterize the pyrolysis mechanism of medium density fiberboard (MDF) and to evaluate the effects of secondary charring reactions on estimated products yields. The kinetic study for pyrolysis of MDF was performed by a thermogravimetric analyzer over a heating rate range from 10 to 40 °C/min in a nitrogen atmosphere. Four stages related to the degradation of resin, hemicellulose, cellulose, and lignin could be distinguished from the thermogravimetric analyses (TGA). Based on the four components and multi-component parallel reaction scheme, a kinetic model considering secondary charring reactions was proposed. A comparison model was also provided. An efficient optimization algorithm, differential evolution (DE), was coupled with the two models to determine the kinetic parameters. Comparisons of the results of the two models to experiment showed that the mass fraction (TG) and mass loss rate (DTG) calculated by the model considering secondary charring reactions were in better agreement with the experimental data. Furthermore, higher product yields than the experimental values will be obtained if secondary charring reactions were not considered in the kinetic study of MDF pyrolysis. On the contrary, with the consideration of secondary charring reactions, the estimated product yield had little error with the experimental data.

show abstract

Characteristics of rice husk tar secondary thermal cracking

Cited by 48 publications

References 20 publications

Co-pyrolysis of Rice Husk with Underutilized Biomass Species: A Sustainable Route for Production of Precursors for Fuels and Valuable Chemicals

Co-pyrolysis of Rice Husk with Underutilized Biomass Species: A Sustainable Route for Production of Precursors for Fuels and Valuable Chemicals

The influence of preparation method of char supported metallic Ni catalysts on the catalytic performance for reforming of biomass tar

Kinetic Study on the Pyrolysis of Medium Density Fiberboard: Effects of Secondary Charring Reactions

Contact Info

Product

Resources

About