Nanoconfinement of Ag nanoparticles inside mesoporous channels of MCM-41 molecule sieve as a regenerable and H2O resistance sorbent for Hg0 removal in natural gas

Zhang, Huawei; Sun, Huamin; Zhang, Dingyuan; Zhang, Wenrui; Chen, Shaojie; Li, Min; Liang, Peng

doi:10.1016/j.cej.2018.12.059

Cited by 54 publications

(24 citation statements)

References 31 publications

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“…However, for the S–Ag/MCM-41, the Ag nanoparticles size (about 19 nm) was much larger than that of Ag/MCM-41, most of which were loaded on the outside surface of molecule sieve. As expected, the Ag/MCM-41 displayed a superior Hg 0 adsorption performance compared with S–Ag/MCM-41 …”

Section: Natural Mineral Sorbentssupporting

confidence: 75%

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Mercury Removal from Flue Gas by Noncarbon Sorbents

Yang

Zhao

et al. 2021

Energy Fuels

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Mercury emitted from coal-fired power production industries is an enormous threat to human health and ecosystems. Sorbent injection is a promising and feasible strategy for mercury removal from the flue gas. Activated carbons (ACs) are the most explored mercury sorbents, which generally displayed high adsorption capacity. However, ACs still suffer from some disadvantages, such as impeding the utilization of fly ash in concrete production, difficulty to be regenerated for recycle, and so on. Thus, many noncarbon sorbents have been developed as supplementary options besides ACs for mercury removal. A review on the recent progress regarding noncarbon sorbents for removing mercury is provided. In this contribution, the Hg 0 removal capacities of natural minerals, waste-derived sorbents, metal oxides, metal sulfides, and magnetic adsorbents have been summarized. Particularly, the modification methods as well as their intrinsic roles for each types of noncarbon sorbents have been presented and discussed in depth. This work provides guidance for the design and exploration of noncarbon adsorbents, which can be applied in both coal-fired power plants and other nonpower production industries.

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Section: Natural Mineral Sorbentssupporting

confidence: 75%

Section: Natural Mineral Sorbentsmentioning

confidence: 99%

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Mercury Removal from Flue Gas by Noncarbon Sorbents

Yang

Zhao

et al. 2021

Energy Fuels

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“…Since the discovery of MCM-41, researchers have taken an interest in its synthesis and application because of its large internal surface, high thermal and hydrothermal stability, possibility of controlling the pore dimension, and potential acidity. Indeed, MCM-41 has been widely studied in adsorption [3][4][5][6], CO 2 capture [7][8][9], catalysis [10][11][12], drug delivery [13,14], and biomedical applications [15] in the last five years. Traditional mesoporous silica materials were synthesized with sodium silicate, tetraethyl orthosilicate, or tetramethyl orthosilicate as silicon sources.…”

Section: Introductionmentioning

confidence: 99%

Simple Synthesis and Characterization of Hexagonal and Ordered Al–MCM–41 from Natural Perlite

Chen

et al. 2019

Minerals

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Silica reagents are expensive and toxic for use in the synthesis of mesoporous silica materials. It is imperative to take an interest in green silicon sources. In this paper, we report the synthesis of hexagonal and ordered aluminum-containing mesoporous silica materials (Al–MCM–41) from natural perlite mineral without addition of silica or aluminum reagents. A pretreatment process involving acid leaching, alkali leaching, and strongly acidic cation exchange resins treatment was critical to obtain silicon and aluminum sources from natural perlite mineral. The Al–MCM–41 material was synthesized via a hydrothermal reaction with hexadecyl trimethyl ammonium bromide (CTAB) as the template and subsequent calcination. The resulting mesophase had a hexagonal and ordered mesoporous structure, confirmed by small-angle X-ray diffraction (SAXRD) and transmission electron microscopy (TEM). Al–MCM–41 material had a high Brunauer–Emmet–Teller (BET) surface area of 1024 m2/g, pore volume of 0.72 cm3/g and an average pore diameter of 2.8 nm with a pore size distribution centered at 2.5 nm. The thermal behavior of the as-synthesized samples during calcination was investigated by thermogravimetry (TG) and differential thermogravimetry (DTG) analysis. The Al–MCM–41 material showed a negative surface charge in aqueous solution with the pH value ranging from 2 to 13. The variations of chemical structures from natural perlite to Al–MCM–41 were traced by wide-angle X-ray diffraction (WAXRD) and Fourier-transform infrared spectroscopy (FTIR). A proposed mechanism for the synthesis of hexagonal and ordered mesoporous silica materials from natural perlite is discussed.

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“…Hg 2+ can be effectively captured by the wet flue gas desulfurization system. − However, the secondary pollution caused by Hg 2+ reduction in desulfurization solution limits the widespread application of the two technologies. , For the sorbent injection technology, Hg 0 and Hg 2+ in flue gas are adsorbed on the sorbent surface to form particulate-bound mercury (Hg p ). − Subsequently, Hg-laden sorbents can be efficiently collected by particulate control devices (such as electrostatic precipitators and fabric filters). − Mercury within used sorbents can be recovered for centralized control during the regeneration process of sorbents . Therefore, sorbent injection is regarded as the most promising technology for mercury removal from flue gas. − …”

Section: Introductionmentioning

confidence: 99%

Nature of Active Sites and an Oxygen-Assisted Reaction Mechanism for Mercury Capture by Spinel-Type CuMn₂O₄ Sorbents

et al. 2019

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CuMn2O4 spinel has been experimentally demonstrated to be a kind of promising sorbent for Hg0 capture from flue gas due to its excellent adsorption performance, regenerability, and recyclability. Theoretical studies based on the state-of-the-art density functional theory (DFT) were performed to gain an understanding of several important aspects of Hg0 removal by a CuMn2O4 sorbent, including active sites and the reaction mechanism. DFT calculation results show that Hg0 and HgO adsorption on the CuMn2O4 surface is dominated by the chemisorption mechanism. The stronger interaction between Hg0 and the CuMn2O4 surface is closely associated with orbital hybridization between the Hg atom and surface metal atoms (Cu and Mn). CuMn2O4 shows an excellent O2-activation ability due to the lower energy barrier. O2 dissociation reaction on the CuMn2O4 surface is activated by 6.31 kJ/mol and is exothermic by 101.37 kJ/mol. The chemisorbed oxygen atom produced from molecular O2 dissociation reacts with adsorbed Hg0 to form HgO species. O2* species can also directly react with adsorbed Hg0. The most favorable pathway for gaseous HgO formation is described by a three-step process, namely Hg0 adsorption, Hg0 oxidation, and HgO desorption. In the comprehensive mercury adsorption–oxidation–desorption process, HgO desorption is predicted to be rate-limiting.

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Nanoconfinement of Ag nanoparticles inside mesoporous channels of MCM-41 molecule sieve as a regenerable and H2O resistance sorbent for Hg0 removal in natural gas

Cited by 54 publications

References 31 publications

Mercury Removal from Flue Gas by Noncarbon Sorbents

Mercury Removal from Flue Gas by Noncarbon Sorbents

Simple Synthesis and Characterization of Hexagonal and Ordered Al–MCM–41 from Natural Perlite

Nature of Active Sites and an Oxygen-Assisted Reaction Mechanism for Mercury Capture by Spinel-Type CuMn₂O₄ Sorbents

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Nanoconfinement of Ag nanoparticles inside mesoporous channels of MCM-41 molecule sieve as a regenerable and H2O resistance sorbent for Hg0 removal in natural gas

Cited by 54 publications

References 31 publications

Mercury Removal from Flue Gas by Noncarbon Sorbents

Mercury Removal from Flue Gas by Noncarbon Sorbents

Simple Synthesis and Characterization of Hexagonal and Ordered Al–MCM–41 from Natural Perlite

Nature of Active Sites and an Oxygen-Assisted Reaction Mechanism for Mercury Capture by Spinel-Type CuMn2O4 Sorbents

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Product

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Nature of Active Sites and an Oxygen-Assisted Reaction Mechanism for Mercury Capture by Spinel-Type CuMn₂O₄ Sorbents