Hydrogen production from biogas reforming and the effect of H2S on CH4 conversion

Chattanathan, Shyamsundar Ayalur; Adhikari, Sushil; McVey, Matthew; Fasina, Oladiran

doi:10.1016/j.ijhydene.2014.09.162

Cited by 53 publications

(22 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this case, the results showed quite stable and active behavior for at least 6 h of operation. Chattanathan et al studied the effect of H 2 S on CH 4 conversion with a commercial catalyst, but quick deactivation was measured and no data about the catalyst composition was offered [16]. Among the literature available regarding sulfur deactivation under the biogas steam reforming process, Appari et al studied the deactivation and regeneration of a Ni catalyst during steam reforming of model biogas.…”

Section: Introductionmentioning

confidence: 99%

Catalyst Deactivation and Regeneration Processes in Biogas Tri-Reforming Process. The Effect of Hydrogen Sulfide Addition

et al. 2018

View full text Add to dashboard Cite

Abstract:This work studies Ni-based catalyst deactivation and regeneration processes in the presence of H 2 S under a biogas tri-reforming process for hydrogen production, which is an energy vector of great interest. 25 ppm of hydrogen sulfide were continuously added to the system in order to provoke an observable catalyst deactivation, and once fully deactivated two different regeneration processes were studied: a self-regeneration and a regeneration by low temperature oxidation. For that purpose, several Ni-based catalysts and a bimetallic Rh-Ni catalyst supported on alumina modified with CeO 2 and ZrO 2 were used as well as a commercial Katalco 57-5 for comparison purposes. Ni/Ce-Al 2 O 3 and Ni/Ce-Zr-Al 2 O 3 catalysts almost recovered their initial activity. For these catalysts, after the regeneration under oxidative conditions at low temperature, the CO 2 conversions achieved-79.5% and 86.9%, respectively-were significantly higher than the ones obtained before sulfur poisoning-66.7% and 45.2%, respectively. This effect could be attributed to the support modification with CeO 2 and the higher selectivity achieved for the Reverse Water-Gas-Shift (rWGS) reaction after catalysts deactivation. As expected, the bimetallic Rh-Ni/Ce-Al 2 O 3 catalyst showed higher resistance to deactivation and its sulfur poisoning seems to be reversible. In the case of the commercial and Ni/Zr-Al 2 O 3 catalysts, they did not recover their activity.

show abstract

Section: Introductionmentioning

confidence: 99%

Catalyst Deactivation and Regeneration Processes in Biogas Tri-Reforming Process. The Effect of Hydrogen Sulfide Addition

et al. 2018

View full text Add to dashboard Cite

show abstract

“…CaO and CaCO 3 are chosen in this study as the H 2 S sorbents. 34 (16) CaO þ CO 2 ↔CaCO 3 ; ΔH 298 K ¼ −178 kJ=mole (17) As indicated in Equation 17, CaO can also serve as a CO 2 sorbent similar to the SE-WGSR and sorptionenhanced steam-methane reforming reaction (SE-SRM) for enhancing H 2 yield based on Le Chatelier's principle. [26][27][28][29] The forward reaction in Equation 17 is also known as the carbonation reaction.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…For x H 2 S = 1000 ppm, the H 2 S conversion does not take place at temperatures lower than 610°C. This is because Equation 16 is an endothermic reaction that takes place as the temperature is high enough. For x H 2 S = 100 ppm case, the temperature required to activate the H 2 S conversion by CaCO 3 increases to 670°C as shown in Figure 10A.…”

Section: Drb Performance Using Caco 3 As H 2 S Sorbentmentioning

confidence: 99%

“…In addition to carbon deposition, another major technological challenge in DRB is the effect of sulfurous compounds on catalyst activity. As mentioned above, the major sulfurous compound in biogas is H 2 S. It has been reported by several studies that the catalyst activity could be significantly affected by very low H 2 S concentration present in the biogas . In the study by Chattanathan et al, catalytic reforming for syngas production was carried out using three different H 2 S concentrations contained in the biogas.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

H ₂ S effect on dry reforming of biogas for syngas production

Chein

Yang

2019

Int J Energy Res

View full text Add to dashboard Cite

Summary The effect of hydrogen sulfide (H2S) on dry reforming of biogas for syngas production was studied both experimentally and theoretically. In the experimental work, the H2S effect on Ni‐based catalyst activity was examined for reaction temperatures ranging from 600°C to 800°C. It was found that the presence of H2S deactivated the Ni‐based catalysts significantly because of sulfur poisoning. Although bimetallic Pt‐Ni catalyst has better performance compared with monometallic Ni catalyst, deactivation was still found. The time‐on‐stream measured data also indicated that sulfur‐poisoned catalyst can be regenerated at high reaction temperatures. In the theoretical work, a thermodynamic equilibrium model was used to analyze the H2S removal effect in dry reforming of H2S‐contained biogas. Calcium oxide (CaO) and calcium carbonate (CaCO3) were used as the H2S sorbent. The results indicated that H2S removal depends on the initial H2S concentration and reaction temperature for both sorbents. Although CO2 was also removed by CaO, the results from equilibrium analysis indicated that the dry reforming reaction in the presence of CaO was feasible similar to the sorption enhanced water‐gas shift and steam‐methane reforming reactions. The simulation results also indicated that CaO was a more preferable H2S sorbent than CaCO3 because syngas with an H2/CO ratio closer to 2 can be produced and requires lower heat duty.

show abstract

“…At Bottrop WWTP, municipal and industrial sewage sludge is digested [2]. Chattanathan et al [9] found in their study on the effect of H 2 S on CH 4 conversion during biogas reforming, that the CH 4 conversion drops to about 20% with small amounts of H 2 S (0.5 mol%) compared to 65% and 85% in the absence of H 2 S.…”

Section: Introductionmentioning

confidence: 99%

Biogas as a source for producing hydrogen at wastewater treatment plants – EuWaK – A pilot project

Reinders¹,

Beckhaus

Illing³

et al. 2015

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

Hydrogen production from biogas reforming and the effect of H2S on CH4 conversion

Cited by 53 publications

References 16 publications

Catalyst Deactivation and Regeneration Processes in Biogas Tri-Reforming Process. The Effect of Hydrogen Sulfide Addition

Catalyst Deactivation and Regeneration Processes in Biogas Tri-Reforming Process. The Effect of Hydrogen Sulfide Addition

H ₂ S effect on dry reforming of biogas for syngas production

Biogas as a source for producing hydrogen at wastewater treatment plants – EuWaK – A pilot project

Contact Info

Product

Resources

About

Hydrogen production from biogas reforming and the effect of H2S on CH4 conversion

Cited by 53 publications

References 16 publications

Catalyst Deactivation and Regeneration Processes in Biogas Tri-Reforming Process. The Effect of Hydrogen Sulfide Addition

Catalyst Deactivation and Regeneration Processes in Biogas Tri-Reforming Process. The Effect of Hydrogen Sulfide Addition

H 2 S effect on dry reforming of biogas for syngas production

Biogas as a source for producing hydrogen at wastewater treatment plants – EuWaK – A pilot project

Contact Info

Product

Resources

About

H ₂ S effect on dry reforming of biogas for syngas production