Deoxygenation of Bio-oil during Pyrolysis of Biomass in the Presence of CaO in a Fluidized-Bed Reactor

Lin, Yu-Yu; Zhang, Chu; Zhang, Mingchuan; Zhang, Jian

doi:10.1021/ef1009605

Cited by 183 publications

(111 citation statements)

References 31 publications

(46 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Since water in the biomass is comparable for all the experiments, it can be assumed that the addition of waste tyre to the feedstock blend also promotes dehydration reactions, being this effect more apparent at higher waste tyre ratios. It can be assumed that the presence of some additives in the waste tyres, such as CaO [29], is favouring dehydration reactions. Density also decreases from 1.2 to 1.1 g/cm 3 as the waste tyre increases in the blend.…”

Section: Liquid Characterisationmentioning

confidence: 99%

Co-pyrolysis of biomass with waste tyres: Upgrading of liquid bio-fuel

Martínez

Veses

Mastral

et al. 2014

Fuel Processing Technology

264

125

View full text Add to dashboard Cite

Co-pyrolysis of forestry wastes and waste tyres is carried out using different facilities: a fixed bed reactor and a continuous auger reactor. Remarkably, only one phase is found in the liquid fraction, which is not achieved by mixture of the pure liquids. In addition, positive effects between waste tyre and biomass are evidenced, being more notable even synergetic in the auger reactor. It is found that whilst acidity, density and oxygen content decrease, pH and calorific value increase with respect to the merely biomass pyrolysis liquid, leading to upgraded bio-oil. Upgrading process is linked to the presence of radical interactions between waste tyres and biomass pyrolysis products. In addition, it is observed that the addition of waste tyres to the feedstock blend is significantly decreasing the amount of aldehydes and phenolic compounds, which is beneficial for improving the stability of the new bio-oils.

show abstract

Section: Liquid Characterisationmentioning

confidence: 99%

Co-pyrolysis of biomass with waste tyres: Upgrading of liquid bio-fuel

Martínez

Veses

Mastral

et al. 2014

Fuel Processing Technology

264

125

View full text Add to dashboard Cite

show abstract

“…These elements tend to catalyze pyrolysis reactions which usually lead to degradation and polymerization of the intermediate products [40,41]. Studies have shown that the addition of alkaline earth metal (Ca) promotes the formation of liquid product during pyrolysis [42,43] and therefore, the increased aqueous phase bio-oil (Table 3). The yield of bio-char observed is attributed to the combined effect of K and Si in the ash.…”

Section: Pyrolysis Product Distribution and Physicochemical Propertiementioning

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

“…The results at 90 °C imply that the alkali metals (K and Na) were reduced approximately equally with all leaching acids but that the alkaline earth metals (Mg and Ca) were not. The result could be beneficial, as alkaline earth metals have been used as catalysts for de-oxygenation during pyrolysis [57,58], by favouring depolymerisation reactions over dehydration reactions [59]. Sulphuric acid caused a large increase in S, indicating that either some of the acid was not washed out during the neutralising step or S became incorporated into the biomass and thus could not be removed through water washing alone.…”

Section: Biomass Leachingmentioning

confidence: 99%

The use of demineralisation and torrefaction to improve the properties of biomass intended as a feedstock for fast pyrolysis

Wigley

Yip

Pang

2015

Journal of Analytical and Applied Pyrolysis

View full text Add to dashboard Cite

Pre-treatments of biomass were investigated to reduce its undesirable properties which may affect the quality of fast pyrolysis bio-oil. A pre-treatment sequence was developed in this study to incorporate both biomass demineralisation and torrefaction. Demineralisation was performed by dilute acid leaching, primarily to reduce the inorganic concentration in raw biomass, whereas torrefaction targeted a reduction of the carboxyl, moisture and oxygen content. The liquid produced during torrefaction was recycled back as the leaching reagent for demineralisation. This solution contained dilute organic acids; therefore, the viability of leaching with organic acids (acetic and formic acid) compared to commonly used mineral acids (sulphuric, nitric and hydrochloric acid) was validated. Synthetic leaching solutions reduced the inorganic content in raw biomass from 0.41 wt% to 0.14 wt% when leached with 1% formic acid and to 0.16 wt% when leached with 1% acetic acid, which was comparable to leaching with the mineral acids. Recycled torrefaction liquid that contained other acidic compounds in small quantities reduced the inorganic content to 0.14 wt%, suggesting it is effective to use the recycled torrefaction liquid as the leaching solution. From the experimental results, the optimal conditions for biomass torrefaction were 260 °C for 20 min to minimise the char formation during pyrolysis, based on the increase in the acid-insoluble fraction of the biomass. However, the torrefaction temperature may be increased to 280 °C if further reductions in acetyl and oxygen content are required. Higher temperatures are associated with severe biomass loss and the initiation of hydrogen loss. It should be noted that even at 280 °C, the oxygen reduction is minimal. If oxygen reduction is the principal target when pre-treating biomass, it is suggested that torrefaction alone is not a suitable method to obtain bio-oil with a low oxygen content due to the low pyrolysis yields obtainable. This study demonstrated that the combined use of demineralisation and torrefaction as biomass pre-treatments has the ability to decrease the inorganic, acetyl and moisture content of biomass, which reduces undesirable catalytic reactions during fast pyrolysis to improve the quality of bio-oil produced.

show abstract

Deoxygenation of Bio-oil during Pyrolysis of Biomass in the Presence of CaO in a Fluidized-Bed Reactor

Cited by 183 publications

References 31 publications

Co-pyrolysis of biomass with waste tyres: Upgrading of liquid bio-fuel

Co-pyrolysis of biomass with waste tyres: Upgrading of liquid bio-fuel

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

The use of demineralisation and torrefaction to improve the properties of biomass intended as a feedstock for fast pyrolysis

Contact Info

Product

Resources

About