Novel Pt/Mg(In)(Al)O catalysts for ethane and propane dehydrogenation

Sun, Pingping; Siddiqi, Georges; Vining, William C.; Chi, Miaofang; Bell, Alexis T.

doi:10.1016/j.jcat.2011.06.008

Cited by 220 publications

(200 citation statements)

References 51 publications

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“…This effect is most pronounced for ethane dehydrogenation and results in a less pronounced activity loss due to the migration of cokes to the support. Sun et al 41 support this statement by proving that, for propane dehydrogenation, a small increase in selectivity to propene is observed within the first hour, after which the selectivity becomes stable. This corresponds to a switch from propane conversion into methane and coke on unalloyed Pt particles to conversion into propene on intermetallic PtIn particles.…”

Section: Ch 3 Ch 2 Oh ⇌ Ch 3 Cho + Hmentioning

confidence: 84%

“…38,[41][42][43][44]51,52 Deactivation due to coking on metal clusters is often reported as the cause of activity decline of hydrotalcite-based bimetallic catalysts. 41,43,52 Hence, the development of activation or regeneration procedures is of significant importance for enhancing the catalyst life-time and its potential commercial exploitation. Akporiaye et al 52 investigated the effect of a single reduction as activation procedure for a PtSnCs on hydrotalcite catalyst for propane dehydrogenation, compared to a reduction-oxidation-reduction cycle before the start of the reaction.…”

Section: Ch 3 Ch 2 Oh ⇌ Ch 3 Cho + Hmentioning

confidence: 99%

“…This corresponds to a switch from propane conversion into methane and coke on unalloyed Pt particles to conversion into propene on intermetallic PtIn particles. 41 More recently, Redekop et al proved the migration of coke from the Pt particles to the support by means of TAP. 53 In this work, the one-pot synthesis of an intermetallic PdZn catalyst is pursued.…”

Section: Ch 3 Ch 2 Oh ⇌ Ch 3 Cho + Hmentioning

confidence: 99%

See 2 more Smart Citations

Formation and stability of an active PdZn nanoparticle catalyst on a hydrotalcite-based support for ethanol dehydrogenation

Waele

Galvita

Poelman

et al. 2017

Catal. Sci. Technol.

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A hydrotalcite-based PdZn nanoparticle catalyst, PdZn/MgĲAl)ĲPd)ĲZn)O x has been synthesized via a onepot procedure. The activation comprising H 2 and air treatmentĲs) allows tuning the nanoparticle formation and, hence, the catalyst performance. Based on an elaborate set of characterization data from EXAFS, in situ XRD, STEM and CO chemisorption, it is concluded that single reduction leads to the formation of Pdrich alloy nanoparticles, i.e., a PdZn shell with a Pd core. Cycled reduction, i.e., 3 subsequent hydrogen and air treatments, ensures the formation of more homogeneously mixed PdZn nanoparticles. Compared with a PdZn/ZnO reference catalyst, the nanoparticles obtained after cycled reduction exhibit a higher initial average turnover frequency in ethanol dehydrogenation, i.e., 7.0 molEtOH (mol Pd s) −1 rather than 3.2 molEtOH (mol Pd s). An activity loss is observed during the first hours on stream. It is attributed to coking of the Pd sites which are also deemed responsible for acetaldehyde decomposition. Hence, the acetaldehyde selectivity steadily increases during the first hours on stream. Subsequently, the acetaldehyde space time yield and selectivity stabilize at 0.7 × 10 −4 mol s −1 kg −1Pd and 98%, respectively.

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Section: Ch 3 Ch 2 Oh ⇌ Ch 3 Cho + Hmentioning

confidence: 84%

Section: Ch 3 Ch 2 Oh ⇌ Ch 3 Cho + Hmentioning

confidence: 99%

Section: Ch 3 Ch 2 Oh ⇌ Ch 3 Cho + Hmentioning

confidence: 99%

See 1 more Smart Citation

Formation and stability of an active PdZn nanoparticle catalyst on a hydrotalcite-based support for ethanol dehydrogenation

Waele

Galvita

Poelman

et al. 2017

Catal. Sci. Technol.

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“…Indium was chosen as a second metal because of its similar properties to tin, and based on its ability to suppress coke formation on platinum catalysts used in dehydrogenation of light alkenes [35]. Silica was used as support material because CO 2 activation is limited on this inert support material, and in the same time allows high degree of nickel reduction [36].…”

Section: Introductionmentioning

confidence: 99%

Carbon dioxide reforming of methane over Ni–In/SiO2 catalyst without coke formation

Károlyi

Németh

Evangelisti

et al. 2018

Journal of Industrial and Engineering Chemistry

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Keywords dry reforming of methane, silica supported nickel catalyst, nickel-indium bimetallic catalyst, coke formation, biogas conversion Highlights· Ni-In/SiO 2 catalysts were prepared by deposition-precipitation with urea. · Both metals were in metallic state after reduction at 700 °C. · Interaction of the two metals was evidenced by TPR, XPS. · The presence of indium in the close vicinity of nickel prevents coke formation. Graphical abstract AbstractThe development of a carbon tolerant nickel catalyst for carbon dioxide reforming of methane (dry reforming of methane, DRM) has been in the focus of catalysis research for several years.In the present study, 3wt%Ni/SiO 2 and bimetallic 3wt%Ni-2wt%In/SiO 2 catalysts (corresponding to 3:1 Ni:In ratio) were prepared by deposition precipitation with urea. Our intention was to modify the nickel surface with a second metal which is known from its ability to reduce surface coke formation. A methane rich reaction mixture (CH 4 :CO 2 :Ar = 2 69:30:1) was used for the catalytic tests at 600 °C and 675 °C. TPO measurements after the catalytic tests showed that there was no surface carbon formation on the indium containing catalyst.Temperature-programmed reduction measurements of the catalysts showed that both nickel and indium was completely reduced after one hour reduction at 700 °C suggesting interaction of the two metals. CO pulse chemisorption experiments revealed that the particle size was similar on the monometallic and bimetallic catalyst, and CO-TPD measurements showed completely different desorption behavior of CO, suggesting the presence of different active sites on the two catalysts. XPS experiments gave similar results, furthermore it was found that after reduction, the Ni/In ratio on the surface was 2.2 compared to the initial value (~3), which refers to the surface enrichment of indium in the bimetallic particles.The lack of coke formation on the indium containing catalyst might be explained by the interplay between a geometric and a chemical effect, that is, indium atoms are most likely situated on the edge and step sites of a nickel particle, influencing reactant adsorption and hindering the growth of carbon nanostructures and/or providing an oxygen rich indium suboxide surface through the reaction with CO 2 in the close vicinity of catalytically active nickel sites, which also inhibits the accumulation of carbon deposits during DRM.

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“…5 In addition, Pt and Pt-based catalysts on hydrotalcite (Mg(Al)O) increase the activity of dehydrogenation of ethane to ethene. 2,6,7 Several studies have shown the catalytic capabilities of stoichiometric and defective MgO(100) surfaces, as well as transition metal catalysts supported on such. 8−12 Successive dehydrogenation to alkynes, and methane production from cracking, can result in coke fouling.…”

Section: Introductionmentioning

confidence: 99%

Alloying Pt Sub-nano-clusters with Boron: Sintering Preventative and Coke Antagonist?

2015

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Immobilized Pt clusters are interesting catalysts for dehydrogenation of alkanes. However, surface-deposited Pt clusters deactivate rapidly via sintering and coke deposition. The results reported here suggest that adding boron to oxide-supported Pt clusters could be a "magic bullet" against both means of deactivation. The model systems studied herein are pure and B-doped Pt clusters deposited on MgO(100). The nonstoichiometric boride cluster obtained via such alloying is found to anchor to the support via a covalent B−O bond, and the cluster-surface binding is much stronger than in the case of pure Pt clusters. Additionally, B introduces covalency to the intracluster bonding, leading to structural distortion and stabilization. The energy required to dissociate a Pt atom from a boride cluster is significantly larger than that of pure Pt clusters. These energetic arguments lead to the proposal that sintering via both Ostwald ripening and particle coalescence would be discouraged relative to pure Pt clusters. Finally, it is shown that the affinity to C also drops dramatically for borated clusters, discouraging coking and increasing the selectivity of potential cluster catalysts.

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Novel Pt/Mg(In)(Al)O catalysts for ethane and propane dehydrogenation

Cited by 220 publications

References 51 publications

Formation and stability of an active PdZn nanoparticle catalyst on a hydrotalcite-based support for ethanol dehydrogenation

Formation and stability of an active PdZn nanoparticle catalyst on a hydrotalcite-based support for ethanol dehydrogenation

Carbon dioxide reforming of methane over Ni–In/SiO2 catalyst without coke formation

Alloying Pt Sub-nano-clusters with Boron: Sintering Preventative and Coke Antagonist?

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