Development of a bimetallic dolomite based tar cracking catalyst

Sun, Yunjuan; Jiang, Jianchun; Kantarelis, Efthymios; Xu, Junming; Li, Linna; Zhao, Shuheng; Yang, Weihong

doi:10.1016/j.catcom.2011.12.040

Cited by 31 publications

(9 citation statements)

References 30 publications

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“…Catalyst reduction: αK 2 O 2 -C αC  αK O-C αCO (12) Catalyst reduction: (1 -α)K 2 O 2 -C + (1 -α)CO  (1 -α)K 2 O-C + (1 -α)CO 2 (13) Overall reaction: αC H 2 O  H + (1 -α)CO 2 (2α -1)CO (14) The complicated potassium intermediates such as K 2 O-C and K 2 O 2 -C could dominate the catalytic process. From above reactions, two redox cycles of K 2 CO 3 and reduced K 2 CO 3 promote the carbon conversion and enhance H 2 yield for steam gasification of biomass or tar.…”

Section: Catalyst Reusabilitymentioning

confidence: 99%

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Catalytic steam reforming of tar derived from steam gasification of sunflower stalk over ethylene glycol assisting prepared Ni/MCM-41

Karnjanakom

Guan

Bayu

et al. 2015

Energy Conversion and Management

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Ethylene glycol (EG) assisted impregnation of nickel catalyst on MCM-41 (Ni/MCM-41-EG) was performed and applied for steam reforming of tar derived from biomass. The catalyst was characterized by SEM-EDX, BET, XRD, and TPR. It is found that smaller nickel particles were well dispersed on MCM-41 and better catalytic activity was shown for the Ni/MCM-41-EG when compared with the catalyst of Ni/MCM-41 prepared by using the conventional impregnation method. H 2 yield increased approximately 8 % when using 20 wt.% Ni/MCM-41-EG instead of 20 wt.% Ni/MCM-41 for the steam reforming of tar derived from sunflower stalk. The catalyst reusability was also tested up to five cycles, and no obvious activity reduction was observed. It indicates that EG assisted impregnation method is a good way to prepare metal loaded porous catalyst with high catalytic activity, high loading amount and long-term stability for the tar reforming.

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Section: Catalyst Reusabilitymentioning

confidence: 99%

“…Various catalysts such as calcite, dolomite, olivine and metal oxide have been investigated for the tar reforming [12][13][14][15][16]. Nickel is one of catalysts for O-H, C-H and C-C cracking during the tar reforming.…”

Section: Introductionmentioning

confidence: 99%

Catalytic steam reforming of tar derived from steam gasification of sunflower stalk over ethylene glycol assisting prepared Ni/MCM-41

Karnjanakom

Guan

Bayu

et al. 2015

Energy Conversion and Management

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“…Boucif et al (2010) investigated the adsorptive behavior of thermally treated dolomite in adsorbing azo dyes. (3) The use of thermally treated dolomite as an esterification catalyst (Ngamcharussrivichai et al, 2007;Miao et al, 2010;Yoosuk et al, 2011;Ilgen, 2012 (4) The application of dolomite as a catalyst in the catalytic pyrolysis of organic waste (Yu et al, 2009;Andrés et al, 2011;González et al, 2011;Sarıoğlan, 2012;Sun et al, 2012;Wang et al, 2012). Andrés et al investigated the catalytic behavior of dolomite in the catalysis of sewage sludge in air-steam gasification.…”

Section: Introductionmentioning

confidence: 99%

The thermochemical activity of dolomite occurred in dolomite–palygorskite

Xie

Chen

Xing

et al. 2016

Applied Clay Science

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“…A pseudo-order reaction, with respect to toluene concentration, has been widely accepted by many researchers for the purposes of conducting an overall tar decomposition kinetic study, with the tar decomposition rate usually assumed to be first-order. ,− The equation can be expressed as follows: In this study, the reactor was consider as plug flow, hence the apparent rate constant can be calculated by eq as follows: where τ is the mean space time and GHSV is the gas hourly space velocity. To determine the activation energy; E a , and pre-exponential factor, A, eq can be linearized according to the Coats–Redfern method as follows: E a and A can be obtained from a plot of ln k app against 1/ T for the first order reaction.…”

Section: Kinetic Parametersmentioning

confidence: 99%

An Experimental Investigation of the Catalytic Activity of Natural Calcium-Rich Minerals and a Novel Dual-Supported CaO–Ca₁₂Al₁₄O₃₃/Al₂O₃ Catalyst for Biotar Steam Reforming

Yin

Tremain

et al. 2018

Energy Fuels

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Tar removal plays a key role in the process efficiency and viability of biomass gasification for syngas production applications. Among currently available tar treatment technologies, catalytic cracking was found to be the most attractive due to minimal energy losses by avoiding cooling of the raw product gas. Naturally available calcium-based catalysts, particularly stone dust and dolomite, have been proven to be effective for biotar cracking; however, they have poor resistance to attrition and undergo deactivation after a few carbonation/calcination cycles. As such, these characteristics play a critical role in determining the viability of their application at a large-scale. Hence to overcome the shortcomings previously stated, a novel dual supported calcium-based catalyst which includes a stable support with great mechanical strength (alumina, Al2O3, and mayenite, Ca12Al14O33) dosed with CaO nanoparticles was synthesized by wet impregnation of calcium on alumina particles with and without the assistance of ultrasonication, referred to as CA and CAU respectively. The synthesized catalysts, as well as the naturally occurring calcium rich minerals stone dust and dolomite, were physically and chemically characterized using a variety of analytical techniques. The synthesized catalysts showed superior mechanical strength up to 5 times greater than the natural minerals. Each of the natural and synthesized catalysts was then investigated in a fixed bed reactor for steam reforming of biotars. In these experiments, toluene was used as a model tar compound to assess the catalytic activity of each and determine the best option in terms of catalytic activity, cost, and mechanical strength. The synthesized CA catalyst without ultrasonic treatment exhibited better tar cracking performance in comparison to stone dust and dolomite in the temperature range of 600 to 800 °C. The synthesized CA catalyst also had the greatest performance in terms of superior surface area and mechanical strength due to the core support of Al2O3. This makes it a potential bed material for further study of tar cracking in large-scale fluidized applications.

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Development of a bimetallic dolomite based tar cracking catalyst

Cited by 31 publications

References 30 publications

Catalytic steam reforming of tar derived from steam gasification of sunflower stalk over ethylene glycol assisting prepared Ni/MCM-41

Catalytic steam reforming of tar derived from steam gasification of sunflower stalk over ethylene glycol assisting prepared Ni/MCM-41

The thermochemical activity of dolomite occurred in dolomite–palygorskite

An Experimental Investigation of the Catalytic Activity of Natural Calcium-Rich Minerals and a Novel Dual-Supported CaO–Ca₁₂Al₁₄O₃₃/Al₂O₃ Catalyst for Biotar Steam Reforming

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Development of a bimetallic dolomite based tar cracking catalyst

Cited by 31 publications

References 30 publications

Catalytic steam reforming of tar derived from steam gasification of sunflower stalk over ethylene glycol assisting prepared Ni/MCM-41

Catalytic steam reforming of tar derived from steam gasification of sunflower stalk over ethylene glycol assisting prepared Ni/MCM-41

The thermochemical activity of dolomite occurred in dolomite–palygorskite

An Experimental Investigation of the Catalytic Activity of Natural Calcium-Rich Minerals and a Novel Dual-Supported CaO–Ca12Al14O33/Al2O3 Catalyst for Biotar Steam Reforming

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Product

Resources

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An Experimental Investigation of the Catalytic Activity of Natural Calcium-Rich Minerals and a Novel Dual-Supported CaO–Ca₁₂Al₁₄O₃₃/Al₂O₃ Catalyst for Biotar Steam Reforming