Sulfur Resistance of Pt‐W Catalysts

Betti, Carolina; Badano, Juan; Rivas, I.; Mazzieri, Vanina A.; Maccarrone, María Juliana; Coloma, Fernando; Vera, Carlos Román; Quiroga, Mónica

doi:10.1155/2013/502014

Cited by 8 publications

(2 citation statements)

References 38 publications

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“…Other studies of kinetic of the selective hydrogenation of pyrolysis gasoline were presented by Zhou et al (2007). The group has already been studying the activity and sulfur resistance of Pd-Ni, Pt-Ni and Pt-W bimetallic catalysts, prepared by successive impregnations, in the selective hydrogenation of styrene to ethylbenzene (Betti et al 2012a(Betti et al , 2018.…”

Section: Introductionmentioning

confidence: 99%

Activity and sulfur resistance of co-impregnated bimetallic PdNi/γ-Al2O3 catalysts during hydrogenation of styrene

Betti

Badano

Lederhos

et al. 2021

Braz. J. Chem. Eng.

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Pyrolysis gasoline (PyGas) is an unstable byproduct of the pyrolysis of naphtha and other hydrocarbons for the production of olefins. PyGas is stabilized by hydrogenation at mild conditions. The hydrogenation of styrene to ethylbenzene is considered a model test reaction for studying the selectivity of the catalysts because it has the slowest rate of conversion. The catalytic activity and selectivity of two bimetallic coimpregnated Pd-Ni catalysts supported on γ-alumina were assessed and compared to those of a commercial monometallic Pd catalyst (AXENS LD265). The laboratory-prepared catalysts had different metal content and Pd:Ni atomic ratios (1:1 and 1:7). Catalytic tests of selective hydrogenation of styrene to ethylbenzene were made in a batch stirred tank reactor and in a continuous fixed bed trickle bed reactor. The sulfur resistance of the bimetallic catalysts in semicontinuous condition, was assessed by means of the same operational conditions using thiophene as a model poison compound. The support, Pd-Ni coimpregnated catalysts and LD265 commercial catalysts were further characterized by N 2 chemisorption,

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Section: Introductionmentioning

confidence: 99%

Activity and sulfur resistance of co-impregnated bimetallic PdNi/γ-Al2O3 catalysts during hydrogenation of styrene

Betti

Badano

Lederhos

et al. 2021

Braz. J. Chem. Eng.

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“…In a previous work our group studied Pt-Ni and Pt-W catalysts, and reported electronic and steric effects that improved the activity or the sulfur resistance. 7,8 The objectives of this work were three: (i) the synthesis of bimetallic Pd-Ni catalysts varying the order of impregnation of the metals and the kind of precursor; chlorided and nitrogenated precursors were used; (ii) the catalytic evaluation of these catalysts; (iii) the assessment of the resistance of the catalysts to deactivation by sulfur poisoning. Four bimetallic catalysts were synthesized: PdNiN, NiNPd, PdNiCl and NiClPd.…”

Section: Introductionmentioning

confidence: 99%

MORE ACTIVE AND SULFUR RESISTANT BIMETALLIC Pd-NI CATALYSTS

Betti¹,

Carrara²,

Badano³

et al. 2017

Quim. Nova

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The influence of the kind of metal precursor and the sequence of impregnation on the properties of Pd-Ni catalysts was evaluated during the test reaction of selective hydrogenation of styrene to ethylbenzene by means of physicochemical characterization. The focus was put on the final hydrogenating activity and the resistance to deactivation by sulfided compounds (thiophene). The used techniques of characterization were ICP, XPS, XDR, TPR, CO chemisorption and TEM. XPS results indicated the presence of different Pd species: Pd δ-, Pd 0 and Pd δ+ . In the case of the Ni containing catalysts, Ni 0 and NiO species were also detected. These palladium and nickel species would be responsables of the variation of activity and sulfurresistance of the catalysts. NiClPd catalysts had a higher resistance to deactivation by sulfur poisoning. This was associated to a higher concentration of Pd η+ Cl x O y species that would prevent the adsorption of thiophene by both steric and electronic effects. It could also be due to the lower concentration of Pd 0 and Ni 0 on these catalysts, as compared to those shown by the PdNiCl catalysts. Both the Pd 0 and Ni 0 species are more prone to poisoning because of their higher electronic availability.

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