On the synthesis of molybdenum carbide with cobalt addition via gas-solid reactions in a CH4/H2 atmosphere

Due to ever more severe environmental regulations regarding SOx, NOx and other pollutants' emissions, there has been an interest in developing new and improved catalysts for hydroprocessing reactions. Mo2C has been reported to display good selectivity and activity for those reactions, especiall...

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Principais autores: Araujo, Camila Pacelly Brandão de, Souza, Carlson Pereira de, Maia, Lucas Mateus Dantas, Souto, Maria Veronilda Macedo, Barbosa, Cleonilson Mafra
Formato: article
Idioma:English
Publicado em: Brazilian Society of Chemical Engineering
Assuntos:
Molybdenum carbide
Cobalt
Fixed bed reactor
Solid state doping
Endereço do item:https://repositorio.ufrn.br/handle/123456789/32532
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spelling ri-123456789-325322021-05-17T14:21:12Z On the synthesis of molybdenum carbide with cobalt addition via gas-solid reactions in a CH4/H2 atmosphere Araujo, Camila Pacelly Brandão de Souza, Carlson Pereira de Maia, Lucas Mateus Dantas Souto, Maria Veronilda Macedo Barbosa, Cleonilson Mafra Molybdenum carbide Cobalt Fixed bed reactor Solid state doping Due to ever more severe environmental regulations regarding SOx, NOx and other pollutants' emissions, there has been an interest in developing new and improved catalysts for hydroprocessing reactions. Mo2C has been reported to display good selectivity and activity for those reactions, especially for HDS. Addition of another metal to the carbide structure may improve catalytic properties. Mo2C with low cobalt addition (2.5 and 5%) was obtained via gas-solid reaction in a fixed bed reactor with CH4 (5%)/H2 atmosphere. XRD and TG/DTA analysis of the precursors were carried out in order to understand its mass loss profile, doping metal presence and phase distributions. CoMoO4 as well as MoO3 were identified after calcining doped precursors at 600 °C/180min. SEM, XRD, XRF, TOC, BET and laser granulometric analysis of the reaction products were also performed. Compositions verified by XRF and theoretical values were compatible. At 700 °C both carbide (Mo2C) and oxide (MoO2) phases are present, as identified in XRD analysis and observed by SEM. At 750 °C only single phase Mo2C was verified by XRD, indicating Co dispersion on the carbide matrix. Morphology at this temperature is compatible with pure Mo2C, though XRF indicates Co presence on the material 2021-05-17T14:21:11Z 2021-05-17T14:21:11Z 2016 article ARAUJO, C. P. B. ; SOUZA, C. P. de; MAIA, L. M. D.; SOUTO, M. V. M.; BARBOSA, C. M.. On the synthesis of molybdenum carbide with cobalt addition via gas-solid reactions in CH4/H2 atmosphere. Brazilian Journal of Chemical Engineering, v. 33, p. 577-588, 2016. Disponível em: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322016000300577#c1. Acesso em: 06 Abr. 2021. http://dx.doi.org/10.1590/0104-6632.20160333s20150107 0104-6632 1678-4383 https://repositorio.ufrn.br/handle/123456789/32532 10.1590/0104-6632.20160333s20150107 en Attribution-NonCommercial 3.0 Brazil http://creativecommons.org/licenses/by-nc/3.0/br/ application/pdf Brazilian Society of Chemical Engineering
institution Repositório Institucional
collection RI - UFRN
language English
topic Molybdenum carbide
Cobalt
Fixed bed reactor
Solid state doping
spellingShingle Molybdenum carbide
Cobalt
Fixed bed reactor
Solid state doping
Araujo, Camila Pacelly Brandão de
Souza, Carlson Pereira de
Maia, Lucas Mateus Dantas
Souto, Maria Veronilda Macedo
Barbosa, Cleonilson Mafra
On the synthesis of molybdenum carbide with cobalt addition via gas-solid reactions in a CH4/H2 atmosphere
description Due to ever more severe environmental regulations regarding SOx, NOx and other pollutants' emissions, there has been an interest in developing new and improved catalysts for hydroprocessing reactions. Mo2C has been reported to display good selectivity and activity for those reactions, especially for HDS. Addition of another metal to the carbide structure may improve catalytic properties. Mo2C with low cobalt addition (2.5 and 5%) was obtained via gas-solid reaction in a fixed bed reactor with CH4 (5%)/H2 atmosphere. XRD and TG/DTA analysis of the precursors were carried out in order to understand its mass loss profile, doping metal presence and phase distributions. CoMoO4 as well as MoO3 were identified after calcining doped precursors at 600 °C/180min. SEM, XRD, XRF, TOC, BET and laser granulometric analysis of the reaction products were also performed. Compositions verified by XRF and theoretical values were compatible. At 700 °C both carbide (Mo2C) and oxide (MoO2) phases are present, as identified in XRD analysis and observed by SEM. At 750 °C only single phase Mo2C was verified by XRD, indicating Co dispersion on the carbide matrix. Morphology at this temperature is compatible with pure Mo2C, though XRF indicates Co presence on the material
format article
author Araujo, Camila Pacelly Brandão de
Souza, Carlson Pereira de
Maia, Lucas Mateus Dantas
Souto, Maria Veronilda Macedo
Barbosa, Cleonilson Mafra
author_facet Araujo, Camila Pacelly Brandão de
Souza, Carlson Pereira de
Maia, Lucas Mateus Dantas
Souto, Maria Veronilda Macedo
Barbosa, Cleonilson Mafra
author_sort Araujo, Camila Pacelly Brandão de
title On the synthesis of molybdenum carbide with cobalt addition via gas-solid reactions in a CH4/H2 atmosphere
title_short On the synthesis of molybdenum carbide with cobalt addition via gas-solid reactions in a CH4/H2 atmosphere
title_full On the synthesis of molybdenum carbide with cobalt addition via gas-solid reactions in a CH4/H2 atmosphere
title_fullStr On the synthesis of molybdenum carbide with cobalt addition via gas-solid reactions in a CH4/H2 atmosphere
title_full_unstemmed On the synthesis of molybdenum carbide with cobalt addition via gas-solid reactions in a CH4/H2 atmosphere
title_sort on the synthesis of molybdenum carbide with cobalt addition via gas-solid reactions in a ch4/h2 atmosphere
publisher Brazilian Society of Chemical Engineering
publishDate 2021
url https://repositorio.ufrn.br/handle/123456789/32532
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