Recent progresses in catalytic tar elimination during biomass gasification or pyrolysis—A review

Abstract:The production of hydrogen-enriched syngas from the thermo-chemical conversion of biomass was studied using Ni/CaAlO x catalysts prepared by coprecipitation method. The effect of Ca addition with different molar ratios of Ca:Al (1:3, 1:2, 1:1, 2:1, 3:1) on the properties and catalytic behaviour in relation to syngas production and the coke formation on the surface of the catalysts were investigated.Catalysts were characterized by BET, XRD, TPR, SEM, and TEM. The SEM and TEM results showed that rod-shaped nano-particles were highly dispersed on the surface of the catalyst. The particle size of NiO was slightly affected with the increase of Ca content in the catalyst. It appeared that the selectivity of CO was increased and the selectivity of CO 2 was reduced with the increase of Ca addition to the catalyst. For example, CO 2 concentration was reduced from 20 to 12 Vol.%, when the molar ratio of Ca/Al was increased from 1:3 to 3:1 for the Ni/CaAlO x catalyst; it is suggested that the water gas shift reaction was inhibited and CO 2 reforming reactions were promoted in the presence of the catalyst with higher Ca content. The CO/H 2 molar ratio could be manipulated by changing the Ca content in the catalyst, while the H 2 concentration remained almost constant (around 45 Vol.%). Thus, using the Ni/CaAlO x catalyst developed in this work could provide a promising route to control the syngas composition, which is an important factor for syngas applications.

show abstract

“…However, this process has challenges towards large-scale development, i.e. low hydrogen production and high tar content in the syngas [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…This type of confined reaction space with uniform Ni particles could enhance the production of H 2 -enriched syngas. However, the nanopores of catalysts have diffusion limitations for largemolecular weight biomass compounds and thus reduce the catalytic performance for syngas production [13].…”

Section: Introductionmentioning

confidence: 99%

Characteristics and catalytic properties of Ni/CaAlO x catalyst for hydrogen-enriched syngas production from pyrolysis-steam reforming of biomass sawdust

Chen

Dong

et al. 2016

Applied Catalysis B: Environmental

143

View full text Add to dashboard Cite

show abstract

“…However, one significant challenge for catalytic gasification is the fast deactivation of catalysts due to coke formation and sintering, which limits the application of catalytic gasification in the emerging bio-refining industry [10][11][12]. Therefore, developing highly stable catalysts with satisfactory catalytic properties are highly desired for biomass gasification.…”

Section: Introductionmentioning

confidence: 99%

Catalytic steam reforming of volatiles released via pyrolysis of wood sawdust for hydrogen-rich gas production on Fe–Zn/Al2O3 nanocatalysts

Chen

Dong

et al. 2015

Fuel

View full text Add to dashboard Cite

Abstract:Thermo-chemical processing of biomass is a promising alternative to produce renewable hydrogen as a clean fuel or renewable syngas for a sustainable chemical industry. However, the fast deactivation of catalysts due to coke formation and sintering limits the application of catalytic thermo-chemical processing in the emerging bio-refining industry. In this research, Fe-Zn/Al 2 O 3 nanocatalysts have been prepared for the production of hydrogen through pyrolysis catalytic reforming of wood sawdust. Through characterization, it was found that Fe and Zn were well distributed on the surface with a narrow particle size. During the reactions, the yield of hydrogen increased with the increase of Zn content, as Zn is an efficient metal promoter for enhancing the performance of the Fe active site in the reaction. The 20% Fe/Al 2 O 3 catalyst with Zn/Al ratio of 1:1 showed the best performance in the process in relation to the hydrogen production and resistance to coke formation on the surface of the reacted catalyst. All the catalysts showed ultra-high stability during the process and nearly no sintering were observed on the used catalysts. Therefore, the nanocatalysts prepared in this work from natural-abundant and low-cost metals have promising catalytic properties (high metal dispersion and stability) to produce H 2 -rich syngas with optimal H 2 /CO ratio from the thermo-chemical processing of biomass.

show abstract

“…[1][2][3][4][5] Gasification is one of the thermochemical treatments, which converts biomass into syngas via partial oxidation at high temperature. [6][7][8][9][10][11][12] Steam or air has been used as gasifying agent. [11][12][13] The syngas can then be used to synthesize various chemicals (e.g., synthesis of methanol via Fischer-Tropsch reaction).…”

Section: Introductionmentioning

confidence: 99%

“…For these applications, however, impurities contained in the syngas such as tar, acidic gases and particulates need to be removed. 8,9,11,13,14 Among the impurities, tar is a major concern for biomass gasification due to a relatively low operation temperatures compared to coal gasification.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Gasification of Mandarin Waste Residue using Ni/CeO₂-ZrO₂

Kim¹,

Kim²,

Park³

et al. 2013

Bulletin of the Korean Chemical Society

View full text Add to dashboard Cite

Catalytic gasification of mandarin waste residue was carried out using direct and indirect catalyst-contact methods for the first time. In the indirect method, non-catalytic reaction in a reactor was followed by catalytic upgrading of vapor product in another reactor. Two different catalysts, Ni/γ-Al2O3 and Ni/CeO2-ZrO2, were employed. CeO2-ZrO2 support was prepared using hydrothermal synthesis in supercritical water. The catalysts were characterized by H2-temperature programmed reduction and Brunauer-Emmett-Teller analyses. Under the condition of equivalent ratio (ER) = 0, the indirect catalyst-contact method led to a higher gas yield than the direct method. Under ER = 0.2, the yield of biogas obtained over Ni/CeO2-ZrO2 was higher than that obtained over Ni/γ-Al2O3. Also, the coke formation of Ni/CeO2-ZrO2 was lower than that of Ni/γ-Al2O3. Such results were attributed to the higher reducibility and better lattice oxygen mobility of Ni/CeO2-ZrO2, which were advantageous for partial oxidation reaction.

show abstract

Recent progresses in catalytic tar elimination during biomass gasification or pyrolysis—A review

Cited by 503 publications

References 167 publications

Characteristics and catalytic properties of Ni/CaAlO x catalyst for hydrogen-enriched syngas production from pyrolysis-steam reforming of biomass sawdust

Characteristics and catalytic properties of Ni/CaAlO x catalyst for hydrogen-enriched syngas production from pyrolysis-steam reforming of biomass sawdust

Catalytic steam reforming of volatiles released via pyrolysis of wood sawdust for hydrogen-rich gas production on Fe–Zn/Al2O3 nanocatalysts

Catalytic Gasification of Mandarin Waste Residue using Ni/CeO₂-ZrO₂

Contact Info

Product

Resources

About

Recent progresses in catalytic tar elimination during biomass gasification or pyrolysis—A review

Cited by 503 publications

References 167 publications

Characteristics and catalytic properties of Ni/CaAlO x catalyst for hydrogen-enriched syngas production from pyrolysis-steam reforming of biomass sawdust

Characteristics and catalytic properties of Ni/CaAlO x catalyst for hydrogen-enriched syngas production from pyrolysis-steam reforming of biomass sawdust

Catalytic steam reforming of volatiles released via pyrolysis of wood sawdust for hydrogen-rich gas production on Fe–Zn/Al2O3 nanocatalysts

Catalytic Gasification of Mandarin Waste Residue using Ni/CeO2-ZrO2

Contact Info

Product

Resources

About

Catalytic Gasification of Mandarin Waste Residue using Ni/CeO₂-ZrO₂