Temperature-programmed sulfidation and oxidation of Ni-Mo/alumina catalysts and reaction with ammonia

Zeuthen, P.; Blom, Peder; Muegge, Brian; Massoth, F.E.

doi:10.1016/s0166-9834(00)84097-x

Cited by 47 publications

(9 citation statements)

References 13 publications

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“…The intensity of the Mo 2 C peaks in the Mo 2 C/γ-Al 2 O 3 -P is higher than the catalyst without P suggesting that the particle size is larger for the former catalyst, even though the support surface area is larger. This result is consistent with a decreased interaction between MoO 3 and γ-Al 2 O 3 -P likely due to the formation of a P layer on the support, causing the formation of larger MoO 3 grains and consequently larger particles of Mo 2 C. This phenomenon of interaction was also observed by Zeuthen et al [15], who suggested that this was due to the formation of an AlPO 4 phase. The dispersions of the Mo 2 C catalysts are compared in Table 1.…”

Section: Characterizationsupporting

confidence: 88%

Novel Supported Bimetallic Carbide Catalysts for Coprocessing of Coal with Waste Materials

Chen¹,

Cox²,

Allen³

et al. 1998

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Section: Characterizationsupporting

confidence: 88%

Novel Supported Bimetallic Carbide Catalysts for Coprocessing of Coal with Waste Materials

Chen¹,

Cox²,

Allen³

et al. 1998

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“…It should be noted that the TGA was carried out under the presence of air; thus, the oxidation and combustion occurred in parallel with pyrolysis throughout the analyses. By comparing the current TGA analyses with the Temperature-Programmed Oxidation (TPO) studies of fresh presulfided and spent NiMo/Al 2 O 3 catalyst, several similarities can be found. − The first mass derivatives peak observed in the fresh presulfided catalyst at 265 °C in Figure -b can be attributed to the oxidation of molybdenum sulfide. Marafi et al evidenced the MoS 2 oxidation at 265 °C by detecting SO 2 in TPO analysis of fresh presulfided Mo/Alumina .…”

Section: Resultsmentioning

confidence: 81%

“…The second mass derivative peak in the fresh presulfided catalyst with a maximum at 450 °C can be referred to two different sources. First, it can be partially due to the oxidation of NiMoS and NiS phases which was evidenced by Zeuthen et al during the study of NiMo/Al 2 O 3 with different Ni/Mo ratios . The authors reported that the peak at 450 °C was absent in presulfided Mo/Alumina catalyst but clearly appeared in the presence of Ni and Mo together on the catalyst.…”

Section: Resultsmentioning

confidence: 91%

“…First, it can be partially due to the oxidation of NiMoS and NiS phases which was evidenced by Zeuthen et al during the study of NiMo/Al 2 O 3 with different Ni/Mo ratios. 44 The authors reported that the peak at 450 °C was absent in presulfided Mo/Alumina catalyst but clearly appeared in the presence of Ni and Mo together on the catalyst. The second SO 2 peak in Figure 14-c is also located at the same temperature which justifies the oxidation of sulfur species on fresh sulfided catalyst in this region.…”

Section: Energy and Fuelsmentioning

confidence: 99%

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Experimental Study on Catalytic Hydroprocessing of Solubilized Asphaltene in Water: A Proof of Concept To Upgrade Asphaltene in the Aqueous Phase

2016

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To prepare the solubilized asphaltene in water (SAW), the feedstock of hydroprocessing experiments, oxidation reactions were conducted in a 550 mL batch reactor in the presence of NaOH in aqueous phase. At 240 °C and 2 h residence time the asphaltenes conversion reached 80% with 50% yield to SAW. The characterization of solubilized asphaltene in water (SAW) revealed that it contains a wide range of carboxylic acids with various alkyl tails. The presence of carboxylate and carboxylic functional groups in the SAW structure was also confirmed with FTIR analyses. The catalytic hydroprocessing of SAW was studied in a 100 mL batch reactor with presulfided NiMo/γ-Al 2 O 3 catalyst. The hydroprocessing results at 320 °C and 3 h residence time for SAW prepared at different severities shows that higher oxidation temperature produces the lighter liquid hydrocarbons, which suggests the oxy-cracking of asphaltene through wet oxidation. Increasing the concentration of solubilized asphaltene in water increased solids formation in hydroprocessing from 12.5% for nonconcentrated SAW to 26% for 10 times concentrated solution. The hydrogen deficiency was evidenced in hydroprocessing of high concentrated SAW, where increasing the initial hydrogen pressure from 600 psig to 1000 psig suppressed the solid formation from 26% to 9.5%. Liquid products from hydroprocessing mainly consisted of two cyclohexyl fused hydrocarbons with higher selectivity to naphthenic and lower selectivity to aromatic compounds. Detecting CO 2 as a major component in the gas phase in parallel with the results of GC/MS before and after hydroprocessing confirms that oxygen removal is dominated by decarboxylation.

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“…Los efectos estructurales debido a la adición de un tercer elemento a los catalizadores típicos de hidrotratamiento ha sido estudiado por diferentes investigadores [69]. La mayoría de los estudios de la influencia de aditivos se han enfocado en la actividad catalítica o selectividad, así como, el tiempo de vida del catalizador.…”

Section: Metales Preciosos Como Aditivos En Catalizadores Comos Y Nimosunclassified

Estudio del efecto del Pt en el catalizador CoMoS soportado en Al2O3-TiO2 en la Hidrodesoxigenación de Guayacol

Venegas

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del CONACyT y cuenta con apoyo del mismo Consejo con el convenio 003893; por lo que agradece la beca recibida, a través del convenio No. 597906 para el desarrollo de esta tesis. Agradecimientos Personales Me gustaría agradecer antes que nada a Dios por darme la fortaleza en los momentos de debilidad y el entendimiento para lograr este objetivo. A mis padres, gracias por siempre apoyarme en mis sueños y enseñarme que todo es posible con esfuerzo y dedicación. Por siempre darme palabras de aliento cuando por momentos pensé en rendirme y por ser mi soporte en la vida. A mis hermanos, por siempre sacarme una sonrisa y aunque nuestras vidas sean completamente diferentes, somos el complemento perfecto, los amo. A mi asesor el Dr. José Antonio de los Reyes, por la confianza depositada en mí y en este proyecto y por compartirme su conocimiento. A los revisores de esta tesis, Dra. Nancy Martín, Dr. Carlos Santolalla y Dr. Andrés Tavizón por la disposición y paciencia para revisar este trabajo. A mi gran amigo Andrés Granados, gracias por esas interminables pláticas sobre ciencia y tus consejos a lo largo del camino, por compartir conmigo no sólo mis momentos felices, sino también los más desastrosos, vergonzosos y tristes.

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Temperature-programmed sulfidation and oxidation of Ni-Mo/alumina catalysts and reaction with ammonia

Cited by 47 publications

References 13 publications

Novel Supported Bimetallic Carbide Catalysts for Coprocessing of Coal with Waste Materials

Novel Supported Bimetallic Carbide Catalysts for Coprocessing of Coal with Waste Materials

Experimental Study on Catalytic Hydroprocessing of Solubilized Asphaltene in Water: A Proof of Concept To Upgrade Asphaltene in the Aqueous Phase

Estudio del efecto del Pt en el catalizador CoMoS soportado en Al2O3-TiO2 en la Hidrodesoxigenación de Guayacol

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