Novel MoP/HY catalyst for the selective conversion of naphthalene to tetralin

Usman, Muhammad; Li, Dan; Razzaq, Rauf; Muhammad, Yaseen; Li, Chunshan; Zhang, Suojiang

doi:10.1016/j.jiec.2014.08.033

Cited by 43 publications

(24 citation statements)

References 47 publications

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“…As the reaction temperature increases from 210 to 300 • C, the extent of hydrogenation of naphthalene increases from 0.23 to about 0.3, while further temperature increases to 380 • C resulted in a decrease to 0.11. Therefore, the catalyst had a higher hydrogenation activity at a temperature of 300 • C, which is consistent with that reported in the literature [23,24].…”

Section: Effect Of Reaction Temperaturesupporting

confidence: 92%

Hydrogenation and Dehydrogenation of Tetralin and Naphthalene to Explore Heavy Oil Upgrading Using NiMo/Al2O3 and CoMo/Al2O3 Catalysts Heated with Steel Balls via Induction

et al. 2020

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This paper reports the hydrogenation and dehydrogenation of tetralin and naphthalene as model reactions that mimic polyaromatic compounds found in heavy oil. The focus is to explore complex heavy oil upgrading using NiMo/Al2O3 and CoMo/Al2O3 catalysts heated inductively with 3 mm steel balls. The application is to augment and create uniform temperature in the vicinity of the CAtalytic upgrading PRocess In-situ (CAPRI) combined with the Toe-to-Heel Air Injection (THAI) process. The effect of temperature in the range of 210–380 °C and flowrate of 1–3 mL/min were studied at catalyst/steel balls 70% (v/v), pressure 18 bar, and gas flowrate 200 mL/min (H2 or N2). The fixed bed kinetics data were described with a first-order rate equation and an assumed plug flow model. It was found that Ni metal showed higher hydrogenation/dehydrogenation functionality than Co. As the reaction temperature increased from 210 to 300 °C, naphthalene hydrogenation increased, while further temperature increases to 380 °C caused a decrease. The apparent activation energy achieved for naphthalene hydrogenation was 16.3 kJ/mol. The rate of naphthalene hydrogenation was faster than tetralin with the rate constant in the ratio of 1:2.5 (tetralin/naphthalene). It was demonstrated that an inductively heated mixed catalytic bed had a smaller temperature gradient between the catalyst and the surrounding fluid than the conventional heated one. This favored endothermic tetralin dehydrogenation rather than exothermic naphthalene hydrogenation. It was also found that tetralin dehydrogenation produced six times more coke and caused more catalyst pore plugging than naphthalene hydrogenation. Hence, hydrogen addition enhanced the desorption of products from the catalyst surface and reduced coke formation.

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Section: Effect Of Reaction Temperaturesupporting

confidence: 92%

Hydrogenation and Dehydrogenation of Tetralin and Naphthalene to Explore Heavy Oil Upgrading Using NiMo/Al2O3 and CoMo/Al2O3 Catalysts Heated with Steel Balls via Induction

et al. 2020

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“…[36] Besides, good dispersion of the metal species and limited segregation of the related oxide particles could also obscure the metal and metal-oxide species from observation by XRD. [37] Althought he XRD signals of metals andm etal oxidesw ithin the bimetallic catalysts are not as intense as that of the HY support, they are strong enough to show the existence of different metals and metal oxidesint he different synthesized catalysts, as shown in Figure 4( 2 q = 33-508). The existence of these bimetallic particles in the prepared catalysts wasf urther verifiedb ye nergy-dispersive X-ray spectroscopy( EDX), as depicted in Figure S2.…”

Section: Structural Characterization Of Ru-based Bifunctional Catalysmentioning

confidence: 96%

“…The presence of reduced metals and metal oxides was not clear from the XRD patterns compared with the signals of HY zeolite. [37] Althought he XRD signals of metals andm etal oxidesw ithin the bimetallic catalysts are not as intense as that of the HY support, they are strong enough to show the existence of different metals and metal oxidesint he different synthesized catalysts, as shown in Figure 4( 2 q = 33-508). [36] Besides, good dispersion of the metal species and limited segregation of the related oxide particles could also obscure the metal and metal-oxide species from observation by XRD.…”

Section: Structural Characterization Of Ru-based Bifunctional Catalysmentioning

confidence: 99%

One‐Pot Process for Hydrodeoxygenation of Lignin to Alkanes Using Ru‐Based Bimetallic and Bifunctional Catalysts Supported on Zeolite Y

et al. 2017

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The synthesis of high-efficiency and low-cost catalysts for hydrodeoxygenation (HDO) of waste lignin to advanced biofuels is crucial for enhancing current biorefinery processes. Inexpensive transition metals, including Fe, Ni, Cu, and Zn, were severally co-loaded with Ru on HY zeolite to form bimetallic and bifunctional catalysts. These catalysts were subsequently tested for HDO conversion of softwood lignin and several lignin model compounds. Results indicated that the inexpensive earth-abundant metals could modulate the hydrogenolysis activity of Ru and decrease the yield of low-molecular-weight gaseous products. Among these catalysts, Ru-Cu/HY showed the best HDO performance, affording the highest selectivity to hydrocarbon products. The improved catalytic performance of Ru-Cu/HY was probably a result of the following three factors: (1) high total and strong acid sites, (2) good dispersion of metal species and limited segregation, and (3) high adsorption capacity for polar fractions, including hydroxyl groups and ether bonds. Moreover, all bifunctional catalysts proved to be superior over the combination catalysts of Ru/Al O and HY zeolite.

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“…The density of acid sites was measured by temperature-programmed desorption of ammonia (NH3-TPD). The desorption peaks below 200, 200-400, and 400-600 °C were considered as weakly, moderately, and strongly acidic, respectively [26][27][28][29]. As shown in Figure 2B, the ammonia desorption peaks of all three SAPO-34 zeolites confirmed the presence of both weakly and strongly acidic sites but the relative ratio of total acidic sites varies the increases in direct correlation according to the Si/Al ratio.…”

Section: Resultsmentioning

confidence: 90%

Propene Adsorption-Chemisorption Behaviors on H-SAPO-34 Zeolite Catalysts at Different Temperatures

et al. 2019

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Propene is an important synthetic industrial product predominantly formed by a methanol-to-olefins (MTO) catalytic process. Propene is known to form oligomers on zeolite catalysts, and paramters to separate it from mixtures and its diffusion properties are difficult to measure. Herein, we explored the adsorption–chemisorption behavior of propene by choosing SAPO-34 zeolites with three different degrees of acidity at various adsorption temperatures in an ultra-high-vacuum adsorption system. H-SAPO-34 zeolites were prepared by a hydrothermal method, and their structural, morphological, and acidic properties were investigated by XRD, SEM, EDX, and temperature-programmed desorption of ammonia (NH3-TPD) analysis techniques. The XRD analysis revealed the highly crystalline structure which posses cubic morphology as confirmed by SEM images. The analysis of adsorption of propene on SAPO-34 revealed that a chemical reaction (chemisorption) was observed between zeolite and propene at room temperature (RT) when the concentration of acidic sites was high (0.158 mmol/g). The reaction was negligible when the concentration of the acidic sites was low (0.1 mmol/g) at RT. However, the propene showed no reactivity with the highly acidic SAPO-34 at low temperatures, i.e., −56 °C (using octane + dry ice), −20 °C (using NaCl + ice), and 0 °C (using ice + water). In general, low-temperature conditions were found to be helpful in inhibiting the chemisorption of propene on the highly acidic H-SAPO-34 catalysts, which can facilitate propene separation and allow for reliable monitoring of kinetic parameters.

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Novel MoP/HY catalyst for the selective conversion of naphthalene to tetralin

Cited by 43 publications

References 47 publications

Hydrogenation and Dehydrogenation of Tetralin and Naphthalene to Explore Heavy Oil Upgrading Using NiMo/Al2O3 and CoMo/Al2O3 Catalysts Heated with Steel Balls via Induction

Hydrogenation and Dehydrogenation of Tetralin and Naphthalene to Explore Heavy Oil Upgrading Using NiMo/Al2O3 and CoMo/Al2O3 Catalysts Heated with Steel Balls via Induction

One‐Pot Process for Hydrodeoxygenation of Lignin to Alkanes Using Ru‐Based Bimetallic and Bifunctional Catalysts Supported on Zeolite Y

Propene Adsorption-Chemisorption Behaviors on H-SAPO-34 Zeolite Catalysts at Different Temperatures

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