Thermal decomposition of Cu(NO3)2·3H2O at reduced pressures

Morozov, Igor; Znamenkov, Konstantin O.; Korenev, Yu. M.; Shlyakhtin, O.A.

doi:10.1016/s0040-6031(03)00057-1

Cited by 79 publications

(47 citation statements)

References 12 publications

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“…However, their actual form is not exactly known. The thermal degradation of metal nitrates in inert atmosphere has been broadly studied in the literature [25][26][27][28][29][30][31] and it was found that nitrates were removed as NO x between 150 and 300 • C. Similarly to the thermal decomposition of nitrocellulose -cellulose doped with nitric acid -it might be assumed that those NO x are mainly NO 2 [32]. Since carbon-based materials are efficient adsorbents [33], the extra-nitrogen measured in chars might therefore originate from the partial adsorption of NO 2 on the carbonaceous material [34] ( Table 3).…”

Section: Expression Of Product Yields On a "Catalyst-free Basis"mentioning

confidence: 99%

Catalytic effect of metal nitrate salts during pyrolysis of impregnated biomass

Eibner

Broust

Blin

et al. 2015

Journal of Analytical and Applied Pyrolysis

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b s t r a c tCatalytic pyrolysis is a promising way to improve bio-oil product quality. In this study, metal salts were directly impregnated in biomass to generate in situ catalysts and investigate their impact on pyrolysis products. Seven metals -Ce, Mn, Fe, Co, Ni, Cu and Zn -were selected and impregnated in eucalyptus using nitrate salts. A fixed-bed reactor, pre-heated at 500• C and inerted with N 2 flow, was used for pyrolysis. Both gas and bio-oil compositions were analysed, paying particular attention to the production of anhydrosugars. The anhydrosugar yields were found to be strongly influenced by the presence of metal salt catalysts. In particular, both Zn and Co salts yielded more anhydrosugars in comparison with catalyst-free sample. Moreover, LAC (1-hydroxy-(1R)-3,6-dioxabicyclo[3.2.1]octan-2-one) was produced in higher amounts than levoglucosan which is commonly produced without any catalyst. Metals were found to remain in all chars and tended to form metal-based nanoparticles (e.g. Cu 0 , Ni 0 , ZnO) able to act as in situ catalysts during the pyrolysis process. It seems that those metal nanoparticles are closely related to LAC production. In parallel to metal cations, nitrates were also suspected to play a significant role during pyrolysis. The suspected impact of anions on levoglucosenone production is discussed. Concerning gas yields, the impregnated nitrate salts were found to strongly affect CO 2 production.

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Section: Expression Of Product Yields On a "Catalyst-free Basis"mentioning

confidence: 99%

Catalytic effect of metal nitrate salts during pyrolysis of impregnated biomass

Eibner

Broust

Blin

et al. 2015

Journal of Analytical and Applied Pyrolysis

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“…Heat treatment temperatures are selected based on the thermal decomposition data of hydrated copper nitrate. In a nitrogen atmosphere, Cu(NO 3 ) 2 ·3H 2 O first melts at 116-152 °C, converts to β-Cu 2 (OH) 3 NO 3 at 199-217 °C, and decomposes to CuO at 263-310 °C [42]. CuO decomposes at >450 °C to Cu 2 O [43] and finally decomposes to metallic copper at higher temperatures.…”

Section: Adsorbent Preparationmentioning

confidence: 99%

Adsorption of Thiophenic Compounds from Model Diesel Fuel Using Copper and Nickel Impregnated Activated Carbons

2012

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Adsorption of sulfur compoundsby porous materials is an effective way to produce cleaner diesel fuel.In this study, adsorption of refractory thiophenic sulfur compounds, i.e., benzothiophene (BT), dibenzothiophene (DBT), and 4,6-dimethyldibenzothiophene (4,6-DMDBT) in single-solute systems from n-hexane solutions onto metal-impregnated activated carbons was investigated. A hydrogen-treated activated carbon fiber was selectively loaded with Ni, NiO, Cu, Cu 2 O, and CuO species to systematically assess the impact of each metal species on the adsorption of thiophenic compounds (TC). Metal-loaded adsorbents had the same total metal contents and similar microporosities, but contained different types of copper or nickel species. All metal-loaded adsorbents showed enhanced adsorption of tested TC. Cu 2 O-or NiO-loaded adsorbents exhibited the highest uptakes, due to more specific interactions between Cu + or Ni 2+ species and TC molecules. The theoretical monolyer coverage of TC on the exposed Cu + sites was estimated and compared with that calculated from the experimental data. Results suggested catalytic conversion of TC molecules to other compounds on the Cu + sites, followed by adsorption of reaction products onto the carbon surface or multilayer accumulation of TC molecules on the Cu + sites. TC adsorption uptake of the majority of adsorbents followed the order of: 4,6-DMDBT > DBT > BT due to higher intensity of specific and non-specific interactions of larger TC molecules with adsorbents.

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“…People have successfully discovered and synthesized plenty of spin materials which are very well described by the low-dimensional Heisenberg-type spin models. The long list includes, to name only a few, the diamond spin chain material azurite5, the kagome spin liquid herbertsmithite6, and Cu(NO 3 ) 2 ·2.5 H 2 O (copper nitrate hemipentahydrate, hereinafter referred to as “CN”) as an alternating Heisenberg antiferromagnetic chain (AHAFC)7891011121314151617181920212223242526272829.…”

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confidence: 99%

Criticality-Enhanced Magnetocaloric Effect in Quantum Spin Chain Material Copper Nitrate

Xiang

Chen

et al. 2017

Sci Rep

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In this work, a systematic study of Cu(NO3)2·2.5 H2O (copper nitrate hemipentahydrate, CN), an alternating Heisenberg antiferromagnetic chain model material, is performed with multi-technique approach including thermal tensor network (TTN) simulations, first-principles calculations, as well as magnetization measurements. Employing a cutting-edge TTN method developed in the present work, we verify the couplings J = 5.13 K, α = 0.23(1) and Landé factors g∥= 2.31, g⊥ = 2.14 in CN, with which the magnetothermal properties have been fitted strikingly well. Based on first-principles calculations, we reveal explicitly the spin chain scenario in CN by displaying the calculated electron density distributions, from which the distinct superexchange paths are visualized. On top of that, we investigated the magnetocaloric effect (MCE) in CN by calculating its isentropes and magnetic Grüneisen parameter. Prominent quantum criticality-enhanced MCE was uncovered near both critical fields of intermediate strengths as 2.87 and 4.08 T, respectively. We propose that CN is potentially a very promising quantum critical coolant.

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Thermal decomposition of Cu(NO3)2·3H2O at reduced pressures

Cited by 79 publications

References 12 publications

Catalytic effect of metal nitrate salts during pyrolysis of impregnated biomass

Catalytic effect of metal nitrate salts during pyrolysis of impregnated biomass

Adsorption of Thiophenic Compounds from Model Diesel Fuel Using Copper and Nickel Impregnated Activated Carbons

Criticality-Enhanced Magnetocaloric Effect in Quantum Spin Chain Material Copper Nitrate

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