Catalytic and Thermal Cracking of Coal-Derived Liquid in a Fixed-Bed Reactor

Shamsi, Abolghasem

doi:10.1021/ie9504765

Cited by 22 publications

(15 citation statements)

References 14 publications

(13 reference statements)

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“…Only a comparison with tar reduction was made (Shan et al, 2018). The Charcoal in this work gave lower apparent activation energies (Ea) values in comparison to several different chars (85.8 KJ/mol for sorbent-free coal char (Shamsi et al, 1996) (Shamsi et al, 1996), BASF (58 KJ/mol) (Aznar, 1998), and G1-25 S (58 KJ/mol) (Aznar, 1998). And it gives pre-exponential factors (k0) higher than the commercial biomass char (1.0 × 10 4 s -1 ) (El-Rub et al, 2008), and foster wheeler char (1.30 × 10 4 s -1 ) (Shamsi et al, 1996).…”

Section: Kinetic Aspects Of Catalytic Reformingmentioning

confidence: 87%

Study on Hydrogen Production Oyf Bio-Oil Catalytic Reforming by Charcoal Catalyst

Zhang¹

2019

Appl. Ecol. Env. Res.

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In this study Charcoal was used as a primary bio-oil steam reforming catalyst. The performance of the catalyst was investigated. The dynamic parameters of the first order dynamic equation were calculated. The stability of charcoal was also examined. The results indicated that first, when reforming temperatures were lower than 700 °C, the bio-oil contents in the outlet dry gas were very high. This indicated unsuitability for further catalytic reforming over a metal catalyst. Second, the catalytic activity of charcoal became very significant under high temperature conditions (≥ 800 °C); thus, the apparent activation energy of the first order kinetic rate constant is 56.98 kJ/mol, and the pre-exponential factor is 1.58 × 10 4 s -1 . Third, the bio-oil contents in the outlet dry gas varied from a decrease to a slight increase in the first 2 h under a catalytic reforming temperature of 900 °C, a WHSV (weight hourly space velocity) of 2.6 h -1 , a bio-oil feeding rate of 47.02 g/h, and a S/B (mass steam-to-bio-oil) ratio of 2. Overall, the charcoal exhibited an excellent bio-oil removal rate (conversion > 99.6%) and the bio-oil contents in the outlet dry gas were lower than 1.89 g/Nm 3 , hence signifying suitability for further reforming over metal catalysts.

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Section: Kinetic Aspects Of Catalytic Reformingmentioning

confidence: 87%

Study on Hydrogen Production Oyf Bio-Oil Catalytic Reforming by Charcoal Catalyst

Zhang¹

2019

Appl. Ecol. Env. Res.

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“…When secondary cracking of non-condensable volatiles occurs, the yields of gas products and char increases because of thermal cracking. The use of activated carbon has been discovered to enhance both cracking and coking reactions of tar components via secondary reactions such as dealkylation and opening of hydroaromatic rings into gaseous fractions and polymerization reactions into char (Shamsi, 1996). It indicates that pyrolysis coupled with activated carbon enabled reforming has great potential for biomass conversion into high-value syngas at moderate operating temperatures.…”

Section: Evaluation Of Pyrolytic Yieldsmentioning

confidence: 99%

Production of H2-Rich Syngas From Lignocellulosic Biomass Using Microwave-Assisted Pyrolysis Coupled With Activated Carbon Enabled Reforming

et al. 2020

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This study focuses on the use of a microwave reactor that combines biomass pyrolysis, at mild temperature, with catalytic reforming of the pyrolytic gas, using activated carbon, for generating hydrogen-rich synthesis gas. The traditional pyrolysis of biomass coupled with the reforming of its pyrolytic yields were also conducted using an electrically heated reactor. The bio-oil attained from conventional pyrolysis was higher in comparison to the yield from microwave pyrolysis. The reforming of the pyrolytic gas fraction led to reductions in bio-oil yield to <3.0 wt%, with a simultaneous increase in gaseous yields. An increase in the syngas and H 2 selectivity was discovered with the reforming process such that the use of microwave pyrolysis with activated carbon reforming produced 85 vol% synthesis gas fraction containing 55 vol% H 2 in comparison to the 74 vol% syngas fraction with 30 vol% H 2 obtained without the reforming. Cracking reactions were improved with microwave heating, while deoxidation and dehydrogenation reactions were enhanced by activated carbon, which creates a reduction environment. Consequently, these reactions generated H 2 -rich syngas formation. The approach implemented in this study revealed higher H 2 , syngas yield and that the overall LHV of products has huge potential in the transformation of biomass into high-value synthesis gas.

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“…As a result, it becomes an industrial common practice and necessity to upgrade coal‐derived liquids by reducing the oxygen content before transportation and utilization . Consequently, catalytic upgrading of coals and coal derivatives has attracted significant attentions due to the potential in producing alternatives to crude oil with similar combustion performance and compatibility with current petroleum‐based infrastructure …”

Section: Introductionmentioning

confidence: 99%

A Novel Evaluation Method Developed for the Denitrogenation and Deoxygenation on Molecules in Coal during Catalytic Treatments

et al. 2019

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In‐depth understanding of coal conversion processes is a key step for clean and efficient utilization of coals in chemical industry. Currently, most analytic methods aim to evaluate heteroatom release on the entire molecules. However, the production of value‐added chemicals from complex mixtures like coals are technically demanding which inevitably requires in‐depth fundamental knowledge of the treatment processes for coals. In‐source collision‐activated dissociation (ISCAD), a mass spectrometric method, can obtain details of aromatic cores and was employed in this work to provide in‐depth understanding of the catalytic conversion process of a low‐rank coal under different solvent conditions. Different heteroatom release patterns on aromatic and alkyl locations were observed for the solvents. Each solvent exhibited a characteristic preference over deoxygenation/denitrogenation on aromatic versus alkyl positions. Such preference is important for developing a desired catalytic treatment for a targeted heteroatom release. Overall, this study provides novel insights in catalytic heteroatom release processes during coal conversion that may be critical for the production of value‐added chemicals from coals.

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Catalytic and Thermal Cracking of Coal-Derived Liquid in a Fixed-Bed Reactor

Cited by 22 publications

References 14 publications

Study on Hydrogen Production Oyf Bio-Oil Catalytic Reforming by Charcoal Catalyst

Study on Hydrogen Production Oyf Bio-Oil Catalytic Reforming by Charcoal Catalyst

Production of H2-Rich Syngas From Lignocellulosic Biomass Using Microwave-Assisted Pyrolysis Coupled With Activated Carbon Enabled Reforming

A Novel Evaluation Method Developed for the Denitrogenation and Deoxygenation on Molecules in Coal during Catalytic Treatments

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