Catalytic cracking of biomass tar over char supported nickel catalyst

Hu, Mian; Laghari, Muhammad Younis; Cui, Baihui; Xiao, Bo; Zhang, Beiping; Guo, Dabin

doi:10.1016/j.energy.2017.12.096

Cited by 162 publications

(74 citation statements)

References 45 publications

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“…Guo et al 15 reported that polycyclic aromatics and O-containing compounds in tar undergo facile cracking to produce monocyclic aromatics during Niloaded coal pyrolysis. The benzene-related compounds obtained from N-hexane soluble fractions of the tar were lower.…”

Section: Effect Of Ni─ca Catalysts On Light Aromatic Hydrocarbonsmentioning

confidence: 99%

“…12 The study also revealed that coal pyrolysis and volatile hydrogenation are the main steps in the hydrogasification process. 14,15 In addition, the presence of coal chars with porous structures, char-C materials with amorphous structures, and alkali and alkaline earth metallic species have been reported to affect the catalytic activity of coal char. On the other hand, the catalytic activity of the Ni─Ca system has been investigated for reducing heavy tar.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Ni─Ca binary catalystic activities for production of light aromatics from catalytic pyrolysis of brown coal

Zhang

Liu

et al. 2019

Asia-Pacific J Chem Eng

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The pyrolysis behavior of Ni─Ca-loaded Yunnan brown coals (Shi Caoxing [SCX] and Guo Jiashan [GJS]) was studied in a fixed-bed reactor to investigate the effects of Ni, Ca, and Ni─Ca loading on the yields of the obtained liquids and light aromatic hydrocarbons. Structural variations of the prepared coal chars were characterized by the scanning electron microscope-energy dispersion X-ray, Fourier-transform infrared spectroscopy, X-ray diffractometer, Brunauer-Emmett-Teller analysis, and elemental analysis. The effects of the Ni, Ca, and Ni─Ca loadings on the tar yield and upgradation of pyrolysis tar were evaluated. The results revealed that the use of the Ni─Ca catalyst affords improved yields of the liquid products and tar. Furthermore, the light hydrocarbon liquids contents in the coal tar was improved with the use of the Ni─Ca catalyst. The heavy components and polycyclic aromatic hydrocarbons in the coal tar could be easy to convert into light hydrocarbon liquids (phenol, cresol, xylenols, and naphthalene) with the SCX brown coal pyrolysis. In contrast, the catalytic pyrolysis of GJS brown coal was inhibited by the Ni─Ca catalyst. The study revealed that the catalytic activity of the Ni─Ca catalyst greatly depends on the type of the coal substrate and was promoted or inhibited depending on the type of the brown coal. Highlights1. The content of light aromatic hydrocarbons is improved by Ni─Ca catalyst.2. The Ca promoter reacted with ash (S and Al) to form CaSO 4 , and CaAl 4 O 7 compounds.3. Phenols are the main components in the light aromatic hydrocarbons. 4. The catalytic activity of the Ni─Ca catalyst promoted or inhibited by coal rank.

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Section: Effect Of Ni─ca Catalysts On Light Aromatic Hydrocarbonsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of Ni─Ca binary catalystic activities for production of light aromatics from catalytic pyrolysis of brown coal

Zhang

Liu

et al. 2019

Asia-Pacific J Chem Eng

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“…Nevertheless, the metallic clusters (Ni +1/+2 ) can be auto-reduced via H 2 or by continuous carbothermal reduction: [45] Ni n+ is carbothermally reduced on carbon surfaces at temperatures above 500 • C, while hydrogen reduction could take place at similar conditions. In a recent study, Hu et al [30] demonstrated that NiO can undergo carbothermal reduction when char is used as support in the catalytic cracking of biomass-derived tars. They suggest that the cokes/soot deposited at lower temperatures (about 650 • C) is further converted at higher temperatures, favoring this way the reaction of nickel oxide with carbon deposits (C + NiO → Ni + CO).…”

Section: Auto-reduction and Catalysts Activitymentioning

confidence: 99%

“…Significant drawback for using carbon-supported catalysts is the fact that, under the gasification atmosphere, the support can be burnt or gasified leading to metal sintering and thereof to the irreversible deactivation of the catalyst. On the other hand, Hu et al [30] demonstrated that, the consumption of support (through carbon gasification and Boudouard's reactions) could lead to the carbothermal reduction of the metallic phases. In a recent paper, Arteaga et al [32] demonstrated that ammonia-based salts could be used as doping element to increase the thermal resistance of carbon materials developed from cellulose.…”

Section: Introductionmentioning

confidence: 99%

“…In a similar study, Wang et al [13] investigated char and char-supported nickel catalysts for secondary syngas cleanup and conditioning; latter were prepared by mechanically mixing NiO and char particles in various ratios and achieved 97% tar removal. In a more recent study, Hu et al [30] demonstrated that char-supported Ni was effective for removing polycyclic aromatics, O-containing and heterocyclic compounds.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic Conversion of Model Tars over Carbon-Supported Ni and Fe

et al. 2018

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Tar removal from gasification gases is a determinant step to guarantee the operational feasibility of gasification-to-chemicals/energy systems. This study aimed to develop novel carbon-supported catalysts for the elimination of tarry aromatics (toluene, naphthalene and benzene) from gasification gases. Effects of reaction temperature (700 < T < 900 • C) and catalyst nature (Fe 0 and Ni 0 ) on the activity were assessed by considering thermo-catalytic conversion and steam reforming, under a simulated gasification gas. The catalysts (Ni and Fe) and support (AC) were characterized by X-ray diffraction (XRD), N 2 physisorption, thermogravimetric analysis (TGA), transmission electron microscopy (TEM) and compositional analyses. Both catalysts and support, presented a mesoporous-like texture with a considerable high surface area (690 < S BET < 743 m 2 /g). Furthermore, dispersion of the metal nanoparticles (active phase) was uniform as confirmed by TEM images. Results from activity tests suggest that Ni/AC has higher effectivity for converting tars than Fe/AC, as confirmed by the low apparent activation energies (34 < E app < 98 kJ/mol) for naphthalene and benzene conversion between 700 and 900 • C. The conversion was 100% above 850 • C; nevertheless; below 750 • C, a sharp reduction in benzene conversion was observed, which was attributed to reversible carbon deposition.

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Thermal‐Chemical Treatment of Sewage Sludge Toward Enhanced Energy and Resource Recovery

Guo

et al. 2021

Sustainable Resource Management, Volume I

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Catalytic cracking of biomass tar over char supported nickel catalyst

Cited by 162 publications

References 45 publications

Investigation of Ni─Ca binary catalystic activities for production of light aromatics from catalytic pyrolysis of brown coal

Investigation of Ni─Ca binary catalystic activities for production of light aromatics from catalytic pyrolysis of brown coal

Catalytic Conversion of Model Tars over Carbon-Supported Ni and Fe

Thermal‐Chemical Treatment of Sewage Sludge Toward Enhanced Energy and Resource Recovery

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