New sulfur adsorbents derived from layered double hydroxides

Sparks, Dennis E.; Morgan, Tonya; Patterson, Patricia M.; Tackett, S. Adam; Morris, Erin; Crocker, Mark

doi:10.1016/j.apcatb.2008.01.012

Cited by 44 publications

(14 citation statements)

References 22 publications

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“…XRD patterns of uncalcined Ni/Al HTLcs with various Ni/Al molar ratios are displayed in Figure 3. It is observed that uncalcined Ni/Al HTLcs represent X-ray diffractogram characteristics of HTLcs, with sharp and symmetric peaks of (003), (006), (110) and (113) planes, and broad and asymmetric peaks of (012), (015) and (018) planes (Sparks et al, 2008). Figure 4 showed XRD patterns of Ni/Al LDOs obtained from Ni/Al HTLcs with various Ni/Al molar ratios calcined at 300°C.…”

Section: Activity Characterization Of Ni/al Ldosmentioning

confidence: 99%

Adsorption Performance of Gaseous HCN on Ni/Al Hydrotalcite-Derived Oxides

Zhao

Yang

et al. 2019

J. Chem. Eng. Japan

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Ni/Al hydrotalcite-derived oxides (Ni/Al LDOs) prepared with various Ni/Al ratios at 300°C were used to investigate the removal of gaseous hydrogen cyanide (HCN). The results showed that Ni/Al LDOs exhibited outstanding performance for HCN removal, especially LDO with a Ni/Al ratio of 4 due to the formation of Ni/Al metal oxides (NiO and Al 2 O 3) and the disappearance of hydrotalcite after 300°C calcination. Comparison of LDO with other Ni/Al ratios, LDO with a Ni/Al ratio of 4 had a higher surface area of 178 mg 2 /g and smaller mesopores of 5.46 nm as determined by nitrogen adsorption/ desorption isotherms. CO 2 temperature programmed desorption (CO 2-TPD) experiments revealed that the weak basic sites and Ni-O group of the LDO with a Ni/Al ratio of 4 dominated HCN removal. Fourier-transform infrared (FTIR) spectra analysis demonstrated that adsorbed CN was converted into [Ni(CN) 4 ] 2 , implying the occurrence of chemical adsorption. Further experiments found that a relatively low concentration water vapor can promote the removal e ciency of HCN on Ni/Al LDOs, while the inhibiting e ect on the removal e ciency of HCN was observed in the presence of water vapor with high concentration due to its competitive adsorption e ect. These ndings are helpful for the development of innovative technology for the removal of HCN, and also provide a new treatment strategy for HCN based on Ni/Al LDOs.

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Section: Activity Characterization Of Ni/al Ldosmentioning

confidence: 99%

Adsorption Performance of Gaseous HCN on Ni/Al Hydrotalcite-Derived Oxides

Zhao

Yang

et al. 2019

J. Chem. Eng. Japan

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“…As shown in Figure 2, the peaks of the original LDH (Figure 2a) Figure 2a shows characteristics of LDHs, featuring sharp and symmetric reflections for the (003), (006), (110), and (113) planes, and asymmetric peaks for the (012), (015), and (018) planes. [20] The XRD patterns of the original LDH can be assigned to the Mg-Al LDH (Mg 4 Al 2 (OH) 12 CO 3 • 3H 2 O, JCPDS 51-1525). The basal spacing (d 003 ) of the original Mg-Al LDH is 770 pm which is close to values reported by Pode et al [21] After H 2 S sorption, XRD patterns of the H 2 S-loaded LDH at 20 8C (Figure 2b) showed no significant change, implying that H 2 S sorption on the Mg-Al LDH may be a physical sorption.…”

Section: Characterization Of the Sorbentmentioning

confidence: 99%

Sorptive Removal of Hydrogen Sulfide from Gas Streams by an Mg‐Al Layered Double Hydroxide

et al. 2015

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Mg-Al layered double hydroxides (Mg-Al LDHs) were used as an adsorbent for hydrogen sulfide (H 2 S) removal. Removal efficiency of H 2 S by the MgAl LDH has been investigated at different temperatures and humidity. The results have shown Mg-Al LDH to be highly promising as an adsorbent for H 2 S removal. Research results about sorption mechanisms indicate that at lower temperatures (20 ºC), H 2 S removal by Mg-Al LDHs is mainly a physical sorption process; however, at higher temperature (> 40 ºC), it is dominated by chemical reactions involving ion exchange. Confirmation of the redox reaction between H 2 S and Mg-Al LDHs was provided by XPS data. The results obtained demonstrate that the H 2 S removal efficiency of Mg-Al LDHs increases with the temperature increasing, and decreases with the water vapour content increasing.

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“…The effects of metal species and content, and the basic density were also discussed. Published results indicated the important effects of dynamic conditions of the experiment and H 2 O content [3,[11][12][13][14][15]17]. So, far little attention was paid to the importance of carbon surface chemical feature for COS hydrolysis and basic strength.…”

Section: Introductionmentioning

confidence: 98%

Catalytic hydrolysis of carbonyl sulfide over modified coal-based activated carbons by loading metal

Tang

et al. 2010

J. Cent. South Univ. Technol.

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A novel type of metal oxide/activated carbon catalyst was prepared by sol-gel method for the hydrolysis of carbonyl sulfide (COS). The influences of the calcination temperature, additive content (2.5%−10.0% Fe 2 O 3 , mass fraction) and the basic density of the activation process were thoroughly investigated. The surface of catalysts was characterized by Boehm titration. The products were characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD) and X-ray photoelectron spectroscopy (XPS). The results show that catalysts with 2.5%−5.0% Fe 2 O 3 after calcining at 500 ℃ have superior activity. The conversion rate of COS increases with increasing the relative density of basic capacity loaded onto activated carbon(AC), and the activity follows the order: KOH＞Na 2 CO 3 ＞NaHCO 3 . Boehm titration data clearly show that the total acidity increases (from 0.06 to 0.48 mmol/g) and the basic groups decrease (from 0.78 to 0.56 mmol/g) after COS hydrolysis and H 2 S adsorption. The XPS results show that the product of H 2 S may be absorbed by the interaction with metal compounds and O 2 to form sulfate (171.28 eV) and element sulfur (164.44 eV), which lead to catalysts poisoning.

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New sulfur adsorbents derived from layered double hydroxides

Cited by 44 publications

References 22 publications

Adsorption Performance of Gaseous HCN on Ni/Al Hydrotalcite-Derived Oxides

Adsorption Performance of Gaseous HCN on Ni/Al Hydrotalcite-Derived Oxides

Sorptive Removal of Hydrogen Sulfide from Gas Streams by an Mg‐Al Layered Double Hydroxide

Catalytic hydrolysis of carbonyl sulfide over modified coal-based activated carbons by loading metal

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