Reactive adsorption desulfurization over a Ni/ZnO adsorbent prepared by homogeneous precipitation

Ai-Hua, Kong; Wei, Yanyu; Li, Yonghong

doi:10.1007/s11705-013-1322-9

Cited by 12 publications

(5 citation statements)

References 12 publications

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“…The justification for using high temperatures to achieve a high conversion in the elimination of thiophene is the fact that at these temperatures, the weakening of its bonds is favored. The results are in agreement with those obtained by Kong et al [50], which concluded that Ni/ZnO does not adsorb the thiophene effectively at 300 °C. Despite the fact that some studies, e.g., the one by Zhang and co-workers [34], claim that a pre-reduction of the sorbent under H2 flow at 360 °C for 6 h was necessary prior to the desulfurization activity test, in our case, the sorbent seems to have been activated in situ in accordance with the study of Bezverkhyy and co-workers [36].…”

Section: Resultssupporting

confidence: 93%

“…For that reason, the base case scenario operating conditions were taken from other applications. Temperature and pressure were specifically set according to studies dealing with thiophene and benzothiophene removal from gasoline and using the Ni/ZnO S-Zorb process [48,49] or sorbents containing Ni/ZnO in their formulations [30,50], with NiO content similar to that of the sorbent used in our study (5 wt% NiO) [48]. It must be noted that the reaction atmosphere is very different.…”

Section: Resultsmentioning

confidence: 99%

“…It must be noted that the reaction atmosphere is very different. For instance, in the work of Kong et al [50], thiophene at a sulfur concentration of 100 ppmw was added to sulfur-free n-heptane used as a model gasoline A. Model gasoline B contained a 100 ppmw sulfur as thiophene and 35 wt% of isopentene as olefins, 15 wt% toluene as aromatic compounds.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the effect of compounds such as toluene is hardly ever studied in those papers. The only reference found is in the work by Kong and co-workers [50]. They evaluated the reactive adsorption desulfurization over a Ni/ZnO adsorbent preparing a synthetic gasoline blend which had a 15 wt% toluene as an aromatic compound.…”

Section: Effect Of Aromatic Inorganic Pollutantsmentioning

confidence: 99%

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Removal of Organic Sulfur Pollutants from Gasification Gases at Intermediate Temperature by Means of a Zinc–Nickel-Oxide Sorbent for Integration in Biofuel Production

Sánchez-Hervás,

Ortiz,

Martí

et al. 2023

Catalysts

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Production of renewable fuels from gasification is based on catalytic processes. Deep desulfurization is required to avoid the poisoning of the catalysts. It means the removal of H2S but also of organic sulfur species. Conventional cleaning consists of a several-step complex approach comprising catalytic hydro-treating followed by H2S removal. In this work, a single-stage process using a zinc and nickel oxide sorbent has been investigated for the removal of organic sulfur species present in syngas. The process is called reactive adsorption and comes from the refinery industry. The challenge investigated by CIEMAT was to prove for the first time that the concept is also valid for syngas. We have studied the process at a lab scale. Thiophene and benzothiophene, two of the main syngas organic sulfur compounds, were selected as target species to remove. The experimental study comprised the analysis of the effect of temperature (250–450 °C), pressure (1–10 bar), space velocity (2000–3500 h−1), tar components (toluene), sulfur species (H2S), and syngas components (H2, CO, and full syngas CO/CO2/CH4/H2). Operating conditions for removal of thiophene and benzothiophene were determined. Increasing pressure and temperature had a positive effect, and full conversion was achieved at 450 °C, 10 bar and 3500 h−1, accompanied by simultaneous hydrogen sulfide capture by the sorbent in accordance with the reactive adsorption desulfurization (RADS) process. Space velocity and hydrogen content in the syngas had little effect on desulfurization. Thiophene conversions from 39% to 75% were obtained when feeding synthetic syngas mimicking different compositions, spanning from air to steam-oxygen-blown gasification. Toluene, as a model tar component present in syngas, did not strongly affect the removal of thiophene and benzothiophene. H2S inhibited their conversion, falling, respectively, to 2% and 69% at 350 °C and 30% and 80% at 400 °C under full syngas blends.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Effect Of Aromatic Inorganic Pollutantsmentioning

confidence: 99%

See 2 more Smart Citations

Removal of Organic Sulfur Pollutants from Gasification Gases at Intermediate Temperature by Means of a Zinc–Nickel-Oxide Sorbent for Integration in Biofuel Production

Sánchez-Hervás,

Ortiz,

Martí

et al. 2023

Catalysts

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“…A wide variety of materials starting from activated carbon (AC), , silica-based sorbents, zeolites 2 , metal oxides, metal–organic frameworks, − graphene-like boron nitride, and metal-exchanged and -impregnated activated carbon, zeolite, and mesoporous materials have been reported in the past for adsorption. Carbon-based adsorbents are preferred due to their maneuvering capacity with a variety of starting materials for obtaining high surface area, controllable physical texture, high mechanical strength, and possible surface modifications apart from the availability of various sources such as coal, wood, polymer, biomaterials such as rice husk, Cassia fistula , organic wastes, carbon cloth, carbon aerogels, resin-derived carbon spheres, rubber tires, − and so on.…”

Section: Introductionmentioning

confidence: 99%

Investigating Adsorptive Deep Desulfurization of Fuels Using Metal-Modified Adsorbents and Process Intensification by Acoustic Cavitation

Suryawanshi

Bhandari

Sorokhaibam

et al. 2018

Ind. Eng. Chem. Res.

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The harmful impact on the environment due to SO x emissions from fuels and increasingly strict norms over the years have amplified deep-desulfurization challenges, consequently enhancing attractiveness of adsorptive separations. The present work focuses on investigating metal modifications and process intensification using acoustic cavitation for improving sulfur removal behavior and selectivity. The proof of concept was elucidated using two model adsorbents: one commercial Shirasagi TAC adsorbent and another newer adsorbent derived from Cassia fistula biomass. Single- and double-metal modifications were studied using zinc, cobalt, nickel, and copper. An attempt was made to further improve the sulfur removal using process intensification using acoustic cavitation coupled with adsorption. The removal of three refractory sulfur compounds (viz. thiophene, benzothiophene, and dibenzothiophene) was studied, and the performance was compared for both single- and double-metal modifications apart from process intensification. In the case of TAC, a high capacity for sulfur removal, up to 23 mg S/g, was obtained, especially for dibenzothiophene. Process intensification using cavitation coupled with adsorption further improved sulfur removal to the extent of 100%, and for metal-modified TAC, a capacity increase up to 38 mg S/g for dibenzothiophene was obtained. The results indicate that the combined effect of metal modification and process intensification can substantially improve the sulfur-removal efficiency of carbon adsorbents.

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Desulfurization Technologies

2018

Biodesulfurization in Petroleum Refining

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Reactive adsorption desulfurization over a Ni/ZnO adsorbent prepared by homogeneous precipitation

Cited by 12 publications

References 12 publications

Removal of Organic Sulfur Pollutants from Gasification Gases at Intermediate Temperature by Means of a Zinc–Nickel-Oxide Sorbent for Integration in Biofuel Production

Removal of Organic Sulfur Pollutants from Gasification Gases at Intermediate Temperature by Means of a Zinc–Nickel-Oxide Sorbent for Integration in Biofuel Production

Investigating Adsorptive Deep Desulfurization of Fuels Using Metal-Modified Adsorbents and Process Intensification by Acoustic Cavitation

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