Kinetics of thermal decomposition of CuSO<sub>4</sub> · 5H<sub>2</sub>O to CuO

Gadalla, Ahmed M.

doi:10.1002/kin.550160604

Cited by 21 publications

(2 citation statements)

References 14 publications

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“…The improved SO 2 -tolerance can be explained by the theory of ionic polarization. [7a] Specifically, the decomposition temperature of Y 2 (SO 4 ) 3 is higher than that of copper sulfate, [17,28] so the Y ions will be preferentially sulfated, thereby inhibiting Cu 2 + poisoning which results in the formation of copper sulfate species. Indeed, the occurrence of SO 2 desorption on the Y species (520 °C) accompanied by a decreased SO 2 desorption signal for the Cu species (450 °C) in Cu(0.25)-Y(0.12)-AEI(10) (SO 2 -TPD; Figure 7d) provides further evidence for our proposition.…”

Section: So 2 -Tolerancementioning

confidence: 99%

Rare‐earth Yttrium Exchanged Cu‐SSZ‐39 Zeolite with Superior Hydrothermal Stability and SO₂‐Tolerance in NH₃‐SCR of NOx

Kong

Zhao

et al. 2022

ChemCatChem

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With the increasingly stringent restrictions on engine exhaust gases, efforts to enhance the activity, hydrothermal stability, and SO2‐tolerance of NH3‐SCR catalysts are highly desirable and challenging. Here, we present the concept of controlled sitings of the metal active sites by modifying Cu‐SSZ‐39 with yttrium (Y) as the rare‐earth metal for enhanced NH3‐SCR performances. Cu(0.25)‐Y(0.12)‐AEI(10) shows superior NOx conversion even after harsh hydrothermal aging at 900 °C, conditions under which standard Cu‐AEI cannot withstand. After long‐term SO2 poisoning, Cu(0.25)‐Y(0.12)‐AEI(10) shows a significantly higher NOx conversion than both Cu‐AEI and conventional Cu‐CHA. The structure‐activity correlation obtained from multiple characterizations, kinetics analyses and DFT calculations reveal that the Y ions act to inhibit dealumination during hydrothermal aging, as a sacrificial agent for SO2‐poisoning, and to stabilize catalytically active Cu centers within the zeolite framework. This synthesis concept provides insight into design of more stable and active NH3‐SCR catalysts in future.

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Section: So 2 -Tolerancementioning

confidence: 99%

Rare‐earth Yttrium Exchanged Cu‐SSZ‐39 Zeolite with Superior Hydrothermal Stability and SO₂‐Tolerance in NH₃‐SCR of NOx

Kong

Zhao

et al. 2022

ChemCatChem

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“…CuSO 4 [see Fig. 1 of Gadalla (1984) Unit-cell symmetry and dimensions of compounds with the general formula GlyÁM 2+ SO 4 ÁnH 2 O.…”

Section: Introductionmentioning

confidence: 99%

X-ray and neutron powder diffraction analyses of Gly·MgSO₄·5H₂O and Gly·MgSO₄·3H₂O, and their deuterated counterparts

et al. 2016

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We have identified a new compound in the glycine-MgSO4-water ternary system, namely glycine magnesium sulfate trihydrate (or Gly·MgSO4·3H2O) {systematic name: catena-poly[[tetraaquamagnesium(II)]-μ-glycine-κ(2)O:O'-[diaquabis(sulfato-κO)magnesium(II)]-μ-glycine-κ(2)O:O']; [Mg(SO4)(C2D5NO2)(D2O)3]n}, which can be grown from a supersaturated solution at ∼350 K and which may also be formed by heating the previously known glycine magnesium sulfate pentahydrate (or Gly·MgSO4·5H2O) {systematic name: hexaaquamagnesium(II) tetraaquadiglycinemagnesium(II) disulfate; [Mg(D2O)6][Mg(C2D5NO2)2(D2O)4](SO4)2} above ∼330 K in air. X-ray powder diffraction analysis reveals that the trihydrate phase is monoclinic (space group P21/n), with a unit-cell metric very similar to that of recently identified Gly·CoSO4·3H2O [Tepavitcharova et al. (2012). J. Mol. Struct. 1018, 113-121]. In order to obtain an accurate determination of all structural parameters, including the locations of H atoms, and to better understand the relationship between the pentahydrate and the trihydrate, neutron powder diffraction measurements of both (fully deuterated) phases were carried out at 10 K at the ISIS neutron spallation source, these being complemented with X-ray powder diffraction measurements and Raman spectroscopy. At 10 K, glycine magnesium sulfate pentahydrate, structurally described by the `double' formula [Gly(d5)·MgSO4·5D2O]2, is triclinic (space group P-1, Z = 1), and glycine magnesium sulfate trihydrate, which may be described by the formula Gly(d5)·MgSO4·3D2O, is monoclinic (space group P21/n, Z = 4). In the pentahydrate, there are two symmetry-inequivalent MgO6 octahedra on sites of -1 symmetry and two SO4 tetrahedra with site symmetry 1. The octahedra comprise one [tetraaquadiglcyinemagnesium](2+) ion (centred on Mg1) and one [hexaaquamagnesium](2+) ion (centred on Mg2), and the glycine zwitterion, NH3(+)CH2COO(-), adopts a monodentate coordination to Mg2. In the trihydrate, there are two pairs of symmetry-inequivalent MgO6 octahedra on sites of -1 symmetry and two pairs of SO4 tetrahedra with site symmetry 1; the glycine zwitterion adopts a binuclear-bidentate bridging function between Mg1 and Mg2, whilst the Mg2 octahedra form a corner-sharing arrangement with the sulfate tetrahedra. These bridged polyhedra thus constitute infinite polymeric chains extending along the b axis of the crystal. A range of O-H...O, N-H...O and C-H...O hydrogen bonds, including some three-centred interactions, complete the three-dimensional framework of each crystal.

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Study of kinetics of thermal decomposition of uranyl nitrate complexes with N-alkylcaprolactams by means of non-isothermal gravimetry

Lu¹,

Yang²,

Sun³

1995

Journal of Thermal Analysis

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Kinetics of thermal decomposition of CuSO₄ · 5H₂O to CuO

Cited by 21 publications

References 14 publications

Rare‐earth Yttrium Exchanged Cu‐SSZ‐39 Zeolite with Superior Hydrothermal Stability and SO₂‐Tolerance in NH₃‐SCR of NOx

Rare‐earth Yttrium Exchanged Cu‐SSZ‐39 Zeolite with Superior Hydrothermal Stability and SO₂‐Tolerance in NH₃‐SCR of NOx

X-ray and neutron powder diffraction analyses of Gly·MgSO₄·5H₂O and Gly·MgSO₄·3H₂O, and their deuterated counterparts

Study of kinetics of thermal decomposition of uranyl nitrate complexes with N-alkylcaprolactams by means of non-isothermal gravimetry

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Kinetics of thermal decomposition of CuSO4 · 5H2O to CuO

Cited by 21 publications

References 14 publications

Rare‐earth Yttrium Exchanged Cu‐SSZ‐39 Zeolite with Superior Hydrothermal Stability and SO2‐Tolerance in NH3‐SCR of NOx

Rare‐earth Yttrium Exchanged Cu‐SSZ‐39 Zeolite with Superior Hydrothermal Stability and SO2‐Tolerance in NH3‐SCR of NOx

X-ray and neutron powder diffraction analyses of Gly·MgSO4·5H2O and Gly·MgSO4·3H2O, and their deuterated counterparts

Study of kinetics of thermal decomposition of uranyl nitrate complexes with N-alkylcaprolactams by means of non-isothermal gravimetry

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Kinetics of thermal decomposition of CuSO₄ · 5H₂O to CuO

Rare‐earth Yttrium Exchanged Cu‐SSZ‐39 Zeolite with Superior Hydrothermal Stability and SO₂‐Tolerance in NH₃‐SCR of NOx

Rare‐earth Yttrium Exchanged Cu‐SSZ‐39 Zeolite with Superior Hydrothermal Stability and SO₂‐Tolerance in NH₃‐SCR of NOx

X-ray and neutron powder diffraction analyses of Gly·MgSO₄·5H₂O and Gly·MgSO₄·3H₂O, and their deuterated counterparts