Controlled nitration of anisole over HNO3/PO4/MoO3/SiO2/solvent systems

Adamiak, Joanna

doi:10.1016/j.molcata.2015.06.025

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…MoOx catalysts have applications in various catalytic reactions, e.g. partial oxidation for light alkenes, hydrotreating, hydrodenitrogenation, or hydrodesulfurisation [1][2][3][4][5]. Molybdenum carbide is also applied as a catalyst for e.g.…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition of ammonium molybdates

Kovács

Hunyadi

Lucena

et al. 2016

J Therm Anal Calorim

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The thermal behavior of ammonium molybdates, i.e. (NH 4 ) 6 Mo 7 O 24 •4H 2 O (1) and (NH 4 ) 2 MoO 4 (2), was studied in inert (N 2 ) and oxidizing (air) atmospheres by TG/DTA-MS, XRD, FTIR and SEM. The thermal decomposition sequence of 2 had similarities to 1; however, there were significant differences as well. When both of them were annealed, NH 3 and H 2 O were released parallel, and in air the asevolved NH 3 was burnt partially into NO and N 2 O. In both atmospheres, while 1 decomposed in four steps, the thermal decomposition of 2 involved 5 steps. In the case of 1, the intermediate products were Most decomposition steps were endothermic, except for the last step around 400 °C, where crystallization from the residual amorphous phase had an exothermic heat effect. In addition, the combustion of NH 3 also changed the DTA curve into exothermic in some cases. The morphology of the final products was characterized by 1-5 m sheet-like particles, except for annealing 2 in N 2 , when 0.5-1 m thick and 5-10 m long needle-shaped particles were detected.

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Section: Introductionmentioning

confidence: 99%

Thermal decomposition of ammonium molybdates

Kovács

Hunyadi

Lucena

et al. 2016

J Therm Anal Calorim

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“…Nowadays, ammonium molybdates, such as ammonium decamolybdate ((NH 4 ) 8 Mo 10 O 34 ), ammonium paramolybdate (APM, (NH 4 ) 6 Mo 7 O 24 ·4H 2 O), ammonium tetramolybdate (AQM, (NH 4 ) 2 Mo 4 O 13 ), ammonium dimolybdate (ADM, (NH 4 ) 2 Mo 2 O 7 ), and ammonium monomolybdate ((NH 4 ) 2 MoO 4 ), are widely used for the preparation of molybdenum oxides, reduced molybdenum oxides, mixed molybdenum oxides, or supported molybdenum oxide catalysts. − They can also be the precursors for molybdenum carbide or molybdenum metal . In addition, molybdate can be used as a corrosion inhibitor, which plays an important role in the corrosion delay of metals , or used in the manufacture of molybdenum-containing catalysts. − Wang et al added 2 wt % of (NH 4 ) 6 Mo 7 O 24 to the ceramic tile polishing waste and heated at 1200 °C for 30 min to prepare foam ceramics with excellent properties .…”

Section: Introductionmentioning

confidence: 99%

Direct Synthesis of Pure Ammonium Molybdates from Ammonium Tetramolybdate and Ammonium bicarbonate

Yang

et al. 2020

ACS Sustainable Chem. Eng.

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Ammonium molybdate production is a complex process with serious environmental pollution. The objective of this work is to develop a sustainable one-step technology to directly produce ammonium molybdates. Results show that the starting material, ammonium tetramolybdate ((NH4)2Mo4O13), can stoichiometrically react with ammonium bicarbonate (NH4HCO3) to directly generate other ammonium molybdates by a solid–gas phase combination reaction in an airtight container under different experimental conditions. The X-ray diffraction analysis indicates that the transformation of ammonium tetramolybdate is a stepwise process of adding ammonium and that the product can be determined by the amount of NH4HCO3 added. Moreover, ammonium heptamolybdate ((NH4)6Mo7O24·4H2O) is more readily to form at lower temperatures because of the attachment of crystal water. Ammonium dimolybdate ((NH4)2Mo2O7) and ammonium decamolybdate ((NH4)8Mo10O34) are formed successively with increasing reaction temperature. The scanning electron microscopy images reveal that the synthesized ammonium molybdates present quite different morphologies. The proposed method is cost-effective and sustainable for cleaner production of commercial ammonium molybdates, and it may also have a broad spectrum of application for conversions of other readily soluble metal salts in metallurgy and chemical engineering fields.

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