Thermodynamic analysis of dry reforming of CH4 with CO2 at high pressures

Chein, Reiyu; Chen, Y.C.; Yu, Ching-Tsung; Chung, J. N.

doi:10.1016/j.jngse.2015.07.001

Cited by 129 publications

(58 citation statements)

References 42 publications

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“…8) showed that the excess of CH 4 in the feed gas had a positive effect on CO 2 conversion, the negative effect on CH 4 conversion and led to higher formation of H 2 when compared to the tests with equimolar feed gas composition, which is in agreement with calculations of thermodynamic equilibrium reported in literature [48,[52][53][54][55]. On the other hand, the tests carried out in the excess of CO 2 in the feed caused a decrease in both CH 4 and CO 2 conversions.…”

Section: Samplesupporting

confidence: 88%

“…It is important to mention that the HTNi25-Ce catalyst showed the most stable performance when the excess of CO 2 was introduced to the reactor. According to thermodynamic model calculations [48,[52][53][54][55], the application of the excess of CO 2 should have a positive effect on catalyst stability, as lower formation of carbon deposits should be expected. Additionally, Ce promotion may help to oxidize deposited coke via reverse Boudouard reaction.…”

Section: Samplementioning

confidence: 99%

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Catalytic activity of hydrotalcite-derived catalysts in the dry reforming of methane: on the effect of Ce promotion and feed gas composition

Dębek

Motak

Gálvez

et al. 2017

Reac Kinet Mech Cat

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Ni/Al and Ni/Mg/Al hydrotalcite-derived materials containing various Ni loadings were synthesized and subsequently promoted with Ce-species via adsorption from [Ce(EDTA)] -complexes. The obtained materials were characterized by elemental analysis (ICP-MS), XRD, H 2 -TPR, CO 2 -TPD, TG and low temperature N 2 sorption experiments. The amount of the introduced Ce was dependent on the nickel and magnesia content in catalysts precursors, and it influenced materials properties (i.e. basicity, reducibility of Ni species) in various ways and the catalytic performance in the dry reforming of methane (DRM). The promoted catalysts showed improved performance with CH 4 and CO 2 conversions at 550°C in the range of 35-55 and 35-45%, respectively. The extent of the improvement was dependent on the nickel content and the presence of magnesia. In general, Ce promotion increased materials stability by changing of the type of carbonaceous deposits. Ce modification hindered the transformation of amorphous carbonaceous deposits to graphitic carbon. The former may be easier oxidized and contribute to syngas production. Two selected catalysts were additionally tested in DRM at elevated temperatures (650 and 750°C) and over various feed gas compositions.

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Section: Samplesupporting

confidence: 88%

Section: Samplementioning

confidence: 99%

Catalytic activity of hydrotalcite-derived catalysts in the dry reforming of methane: on the effect of Ce promotion and feed gas composition

Dębek

Motak

Gálvez

et al. 2017

Reac Kinet Mech Cat

View full text Add to dashboard Cite

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“…above 700°C) and low pressure (i.e. around atmospheric pressure) [9,10]. The main products of this reaction are CO and H 2 , but coke deposition is inevitable below 900°C at atmospheric pressure [10].…”

Section: Introductionmentioning

confidence: 99%

“…around atmospheric pressure) [9,10]. The main products of this reaction are CO and H 2 , but coke deposition is inevitable below 900°C at atmospheric pressure [10]. Water was usually reported as another by-product in the literature, and was recently quantified by Rêgo de Vasconcelos et al [11].…”

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite supported bimetallic cobalt and nickel catalysts for syngas production from dry reforming of methane

Phan

Sane

Vasconcelos

et al. 2018

Applied Catalysis B: Environmental

139

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A B S T R A C T Hydroxyapatite (HAP, Ca 10 (PO 4 ) 6 (OH) 2 ) has all the criteria of a catalyst support, in particular its high thermal stability. However it is still less studied in the heterogeneous catalysis. For the first time, hydroxyapatite supported bimetallic Co-Ni catalysts were prepared and evaluated in the dry reforming of methane (DRM) process. Nanoparticles containing both nickel and cobalt were well formed on the surface of HAP by conventional impregnation methods. No modification of HAP structure was observed after metals deposition. DRM reaction was carried out at 700-750°C and around 1.6 bar, using a fixed-bed reactor which was fed with a mixture of 20%vol CH 4 , 20%vol CO 2 and 60%vol N 2 . CH 4 and CO 2 conversion reached up to 60 and 68% at 700°C, respectively, and 73 and 79% at 750°C, respectively during long reaction times of 50-160 h. Water as a by-product could be quantified along the catalytic reaction indicating the implication of reverse water-gas-shift reaction. TEM-EDX analysis of the used catalysts recovered after catalytic tests showed that coke deposition was limited and there was slight modification of metals particle size. The results obtained were very promising for the design of an efficient catalytic system for DRM process.

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“…A C C E P T E D ACCEPTED MANUSCRIPT Chein et al (2015) conducted thermodynamic analysis of dry reforming of CO 2 with CH 4 (DRM) at high pressures. The thermodynamic equilibrium of DRM was studied using the Gibbs-free-energy minimization at elevated pressures.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

Catalytic conversion of natural gas and methane to synthesis gas and beyond: A collection of published research (2009–2015)

Wood

2015

Journal of Natural Gas Science and Engineering

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Thermodynamic analysis of dry reforming of CH4 with CO2 at high pressures

Cited by 129 publications

References 42 publications

Catalytic activity of hydrotalcite-derived catalysts in the dry reforming of methane: on the effect of Ce promotion and feed gas composition

Catalytic activity of hydrotalcite-derived catalysts in the dry reforming of methane: on the effect of Ce promotion and feed gas composition

Hydroxyapatite supported bimetallic cobalt and nickel catalysts for syngas production from dry reforming of methane

Catalytic conversion of natural gas and methane to synthesis gas and beyond: A collection of published research (2009–2015)

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