2015
DOI: 10.1021/ef502125j
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Cracking Characteristics of Simulated Dust-Containing Coal Pyrolysis Volatiles over Regenerated Nickel-Based Catalysts

Abstract: Two catalysts, 2%NiO/1%CeO 2 −Al 2 O 3 and 2%NiO/1%CeO 2 /2%ZrO 2 −Al 2 O 3 , were employed in the conversion of tar in coal pyrolysis volatiles to investigate the interrelationship between dust collection and tar cracking as well as the effect of Ce/Zr doping on catalyst performance. In a fixed-bed catalytic reactor, a tar model mixture (57 wt % toluene, 14 wt % methylnaphthalene, 14 wt % cyclohexane, and 15 wt % dodecane) and simulated dusts (various metal oxides) were introduced to mimic real coal pyrolysis… Show more

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Cited by 12 publications
(7 citation statements)
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“…Most researchers have reported some increase in tar reforming activity and lower coke deposition when the partial pressure of water is increased. ,,, However, there appears to exist an optimum water partial pressure, for most catalysts. When the partial pressure exceeds the optimum, the activity decreases, e.g., for Ni/Fe 2 O 3 –Al 2 O 3 , and other Ni-based catalysts . Our results seem to agree with this.…”
Section: Results and Discussionsupporting
confidence: 86%
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“…Most researchers have reported some increase in tar reforming activity and lower coke deposition when the partial pressure of water is increased. ,,, However, there appears to exist an optimum water partial pressure, for most catalysts. When the partial pressure exceeds the optimum, the activity decreases, e.g., for Ni/Fe 2 O 3 –Al 2 O 3 , and other Ni-based catalysts . Our results seem to agree with this.…”
Section: Results and Discussionsupporting
confidence: 86%
“…When the partial pressure exceeds the optimum, the activity decreases, e.g., for Ni/Fe 2 O 3 −Al 2 O 3 , 61 and other Nibased catalysts. 20 Our results seem to agree with this.…”
Section: Industrial and Engineering Chemistry Researchsupporting
confidence: 87%
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“…11−14 However, many factors are affecting the stability of the catalyst, such as mechanical strength, surface area, and surface carbon deposition or hightemperature sintering. 15,16 Additionally, the regeneration of catalyst incurs a large energy consumption. Therefore, the oxygen carrier (OC) might be used to carry out a chemical looping reforming (CLR) of coal tar.…”
Section: Introductionmentioning
confidence: 99%
“…It is beneficial to use the chemical method to convert the macromolecular tar into smaller combustible gas molecules. Among the chemical methods, the catalytic cracking method uses a catalyst to reduce the activation energy and has a higher tar conversion efficiency at a higher reaction rate. However, many factors are affecting the stability of the catalyst, such as mechanical strength, surface area, and surface carbon deposition or high-temperature sintering. , Additionally, the regeneration of catalyst incurs a large energy consumption. Therefore, the oxygen carrier (OC) might be used to carry out a chemical looping reforming (CLR) of coal tar.…”
Section: Introductionmentioning
confidence: 99%