Influence of the metallic content on Pt-Ir/Nb 2 O 5 catalysts for decalin selective ring opening

Benítez, Viviana M.; Lima, Simone Pereira de; Rangel, María do Carmo; Ruiz, Dóris; Reyes, Patricio; Pieck, C.L.

doi:10.1016/j.cattod.2016.10.004

Cited by 15 publications

(11 citation statements)

References 58 publications

(70 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the other samples, it is probable that the adsorbed ammonia quantity was so low that, due to the equipment detection limit, it was not possible to identify the desorption peaks in TPD profiles. In all cases, whole acidity values were lower than the ones obtained by other authors [32] for pure niobium oxide (403 mmol NH 3 .g -1 ). It could show that cobalt interaction decreased niobium oxide acidity.…”

Section: Cocanb Cosrnbcontrasting

confidence: 71%

“…Magnesium ions incorporation into cobalt niobate crystalline structure is facilitated because Mg 2+ has low ionic radius value (0.72 Å). On the other hand, this did not happen with Ca 2+ and Sr 2+ ions, because they have higher ion radius values, 1.00 and 1.18 Å, respectively [32]. Regarding the variety of phases found, other authors also observed cobalt niobate different phases formation [8,13,31,33] because, just like niobium, cobalt can assume different oxidation states and shows varied phases, depending on the support and the preparation method [7,8,15,29].…”

Section: Resultsmentioning

confidence: 97%

See 1 more Smart Citation

Synthesis, Characterization and Catalytic Evaluation of Cobalt and Niobium Oxide Solids Modified with Alkaline Earth Metals

et al. 2020

Self Cite

View full text Add to dashboard Cite

Cobalt and niobium oxide solids modified with alkaline earth metals (Mg, Ca, and Sr) were synthesized and characterized to compare the second element effect on the catalyst structural and chemical properties. The materials were prepared by co-precipitation of cobalt nitrate and niobium oxalate solutions using ammonium hydroxide as precipitating agent. The samples were characterized by XRD, SEM, Ra-man, BET, TPR, ammonia TPD and cyclohexane dehydrogenation reaction (CHD). Results showed that Mg, Ca or Sr addition changed cobalt niobate crystalline structure, leading to alkaline earth metal nio-bates with lower crystallinity. It was observed that Mg, Ca or Sr increased the solids acidity and changed cobalt niobate reduction behavior so that the lowest amount of metallic cobalt was obtained when Mg was incorporated. Modifiers also decreased cobalt niobate dehydrogenation activity. This effect was higher with Mg or Sr addition.

show abstract

Section: Cocanb Cosrnbcontrasting

confidence: 71%

Section: Resultsmentioning

confidence: 97%

Synthesis, Characterization and Catalytic Evaluation of Cobalt and Niobium Oxide Solids Modified with Alkaline Earth Metals

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Among them, niobium oxide (Nb 2 O 5 ) has been used as a solid acid catalyst with the Lewis acid sites on its surface for various heterogeneous or homogeneous catalysis. 15,[30][31][32][33][34][35][36][37][38] Oxygen vacancies were introduced into Nb 2 O 5 via thermal treatment to obtain defective Nb 2 O 5 -supported Pt catalysts for CO oxidation. 36 So, niobium pentoxide supported platinum metal catalyst may be a promising catalyst.…”

Section: Introductionmentioning

confidence: 99%

“…S5, † which indicates that Pt is uniformly dispersed on the support, but size and form of Pt are still unclear. Consulting other groups' work about Pt/Nb 2 O 5 , Pt species were loaded on Nb 2 O 5 with size of particles of 2.7-17.9 nm,30,31,36,44 while the Pt species of calcined samples in this work cannot be identied on HRTEM images, suggesting that ultrane Pt species supported in Nb 2 O 5 obtained by the urea-based deposition-precipitation approach, proving the superiority of nanosized Nb 2 O 5 in this work.…”

mentioning

confidence: 99%

Ultra-fine platinum species supported on niobium pentoxide for CO oxidation

Wang

Wang³

et al. 2020

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…The existence of noble metals can increase the reactivity of aromatics hydrogenation. Hydrogenolysis of aromatics on metal catalysts is a favorable way for accomplishing SRO reaction (Benitez et al 2017). Recent research proved that hydrogenation of aromatics should be accomplished ahead of ring opening (Do et al 2006;Mouli et al 2007;Ziaei-Azad and Sayari 2016).…”

Section: Introductionmentioning

confidence: 99%

Preparation of a highly efficient Pt/USY catalyst for hydrogenation and selective ring-opening reaction of tetralin

et al. 2018

View full text Add to dashboard Cite

Ultrastable Y zeolite (USY)-supported Pt catalyst was prepared by gas-bubbling-assisted membrane reduction. The influence of reaction conditions and the metal and acid sites of catalysts on the catalytic performance of catalyst in hydrogenation and selective ring opening of tetralin, 1,2,3,4-tetrahydronaphthalene (THN), was studied. It was found that the optimal reaction conditions were at a temperature of 280°C, hydrogen pressure of 4 MPa, liquid hourly space velocity of 2 h-1 and H 2 /THN ratio of 750. Under these optimal conditions, a high conversion of almost 100% was achieved on the 0.3Pt/USY catalyst. XRD patterns and TEM images revealed that Pt particles were highly dispersed on the USY, favorable to the hydrogenation reaction of tetralin. Ammonia temperature-programmed desorption and Py-IR results indicated that the introduction of Pt can reduce the acid sites of USY, particularly the strong acid sites of USY. Thus, the hydrocracking reaction can be suppressed.

show abstract

Influence of the metallic content on Pt-Ir/Nb 2 O 5 catalysts for decalin selective ring opening

Cited by 15 publications

References 58 publications

Synthesis, Characterization and Catalytic Evaluation of Cobalt and Niobium Oxide Solids Modified with Alkaline Earth Metals

Synthesis, Characterization and Catalytic Evaluation of Cobalt and Niobium Oxide Solids Modified with Alkaline Earth Metals

Ultra-fine platinum species supported on niobium pentoxide for CO oxidation

Preparation of a highly efficient Pt/USY catalyst for hydrogenation and selective ring-opening reaction of tetralin

Contact Info

Product

Resources

About