DFT insights into the adsorption of NH3-SCR related small gases in Mn-MOF-74

2016 ◽  
Vol 18 (41) ◽  
pp. 28854-28863 ◽  
Author(s):  
Minhua Zhang ◽  
Xuewei Huang ◽  
Yifei Chen
Keyword(s):  
Competitive Adsorption ◽  
Adsorption Properties ◽  
Nh3 Scr

The adsorption properties of six NH3-SCR related small gases and the competitive adsorption of NH3, SO2 and NH3, H2O were investigated.

Adsorption properties of CH4 and CO2 in quartz nanopores studied by molecular simulation

RSC Advances ◽  
2016 ◽  
Vol 6 (39) ◽  
pp. 32770-32778 ◽  
Author(s):  
Haoyang Sun ◽  
Wenchao Sun ◽  
Hui Zhao ◽  
Yange Sun ◽  
Dianrui Zhang ◽  
...  
Keyword(s):  
Molecular Simulation ◽  
Binary Mixtures ◽  
Adsorption Isotherms ◽  
Competitive Adsorption ◽  
Adsorption Properties ◽  
Density Distributions ◽  
Adsorption Density ◽  
Surface Hydroxylation

Competitive adsorption isotherms and adsorption density distributions of binary mixtures containing CH4 and CO2 in nanopores with 100% and 60% surface hydroxylation at 323 K.

Tailored activity of Cu–Fe bimetallic Beta zeolite with promising C3H6 resistance for NH3-SCR

2021 ◽  
Author(s):  
Qi Zhao ◽  
Bingbing Chen ◽  
Bolin Zou ◽  
Limei Yu ◽  
Chuan Shi
Keyword(s):  
Competitive Adsorption ◽  
Beta Zeolite ◽  
Nh3 Scr

The introduction of Cu has inhibited the polymerization of C3H6 and promoted the oxidation of C3H6, which alleviated competitive adsorption between C3H6 and NOx, therefore results in the enhanced NH3-SCR performance in the presence of C3H6.

The removal of Cu(II) and Pb(II) ions from aqueous solutions by temperature-sensitive hydrogels based on N-isopropylacrylamide and itaconic acid

2021 ◽  
pp. 1-19
Author(s):  
Bengi Özkahraman ◽  
Eren Yıldırım ◽  
Serkan Emik ◽  
Işıl Acar
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Kinetics ◽  
Itaconic Acid ◽  
Competitive Adsorption ◽  
Adsorption Properties ◽  
Temperature Sensitive ◽  
Order Model ◽  
Ion Removal ◽  
Adsorption Capacities ◽  
Pseudo Second Order

This study deals with the potential use of poly(N-isopropylacrylamide-co-itaconic acid) temperature-sensitive hydrogels as an adsorbent for the removal of Cu(II) and Pb(II) ions from aqueous solutions. For this aim, the adsorption properties of hydrogels were examined by adsorption capacities, adsorption isotherm, and adsorption kinetics experiments. To describe the adsorption characteristics of hydrogels, the obtained experimental data were evaluated by Langmuir, Freundlich, Redlich-Peterson, and Dubinin-Radushkevich isotherm models. Adsorption kinetics experiments were carried out not only in single systems but also in binary systems where both ions were at equal initial concentrations for competitive adsorption studies. To predict the behaviors of the competitive and non-competitive adsorption process of ions onto hydrogels, the experimental adsorption data were analyzed by the pseudo-first-order model and the pseudo-second-order model. According to non-competitive ion removal findings, the adsorption capacities followed order Cu(II) >  Pb(II) for all hydrogels, and the pseudo-second-order kinetic model explained the adsorption properties of the hydrogels. Competitive ion removal studies showed that all hydrogels were selective to Cu(II) ion. Furthermore, in the case of comparative investigations both of competitive Cu(II) and competitive Pb(II) removal by hydrogels, the metal ion removal capacity of N10 hydrogel was found as a bit higher than that of N7.5 and N5 in 48 h. That is, as the acidic group content increased in the hydrogel network, the adsorption capacity values also increased. In addition, the reusability of temperature-sensitive hydrogels seems possible without regeneration or after regenerating with acid, in case the temperature is increased above the LCST. Furthermore, even if it cannot be reused, these hydrogels that retain metal ions reach very small volumes by shrinking when the LSCT is exceeded, and thus they can be eliminated more easily than other conventional gels due to their small size. As a result, this temperature-sensitive hydrogel may propose as an alternative environmentally friendly adsorbent candidate for can be used for water purification and wastewater treatment.

scholarly journals Laponites® for the Recovery of 133Cs, 59Co, and 88Sr from Aqueous Solutions and Subsequent Storage: Impact of Grafted Silane Loads

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 572
Author(s):  
Thomas Thiebault ◽  
Jocelyne Brendlé ◽  
Grégoire Augé ◽  
Lionel Limousy
Keyword(s):  
Competitive Adsorption ◽  
Saline Solution ◽  
Covalent Binding ◽  
Adsorption Properties ◽  
Inorganic Cations ◽  
Adsorption Sites ◽  
Initial Load ◽  
Subsequent Storage ◽  
Saline Solutions

In this study, silylated Laponites® (LAP) were synthetized with various loads of 3-aminopropyltriethoxysilane (APTES) to evaluate their adsorption properties of 133Cs, 59Co, and 88Sr during single-solute and competitive experiments. The increase in the initial load of APTES increased the adsorbed amount of APTES in the resulted grafted clay. The characterization of LAP-APTES exhibited a covalent binding between APTES and LAP and emphasized the adsorption sites of APTES for each tested load. In comparison with raw LAP, LAP-APTES displayed significantly higher adsorption properties of Co2+, Cs+, and Sr2+. The competitive adsorption of these three contaminants provides a deeper understanding of the affinity between adsorbate and adsorbent. Therefore, Co2+ displayed a strong and specific adsorption onto LAP-APTES. Except for Cs+, the adsorption capacity was improved with increasing the load of APTES. Finally, the desorption behavior of the three contaminants was tested in saline solutions. Cs+ and Sr2+ were significantly released especially by inorganic cations displaying the same valence. Conversely, desorption of Co2+ was very low whatever the saline solution. LAP-APTES, therefore, presented suitable adsorption properties for the removal of radionuclides especially for Co2+, making this material suitable to improve the decontamination of radioactive wastewaters.

A MnO2-based catalyst with H2O resistance for NH3-SCR: Study of catalytic activity and reactants-H2O competitive adsorption

2020 ◽  
Vol 270 ◽  
pp. 118860 ◽  
Author(s):  
Ningqiang Zhang ◽  
Lingcong Li ◽  
Yizhong Guo ◽  
Junda He ◽  
Rui Wu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Competitive Adsorption ◽  
Nh3 Scr
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