PtSn/γ-Al2O3 isobutane dehydrogenation catalysts: The effect of alkaline metals addition

Siri, Guillermo Jorge; Bertolini, G.; Casella, Mónica Laura; Ferretti, Osmar A.

doi:10.1016/j.matlet.2005.03.013

Cited by 65 publications

(35 citation statements)

References 17 publications

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“…As the chromium posed great danger to the environment, the platinum supported catalysts are mainly studied. The researches on the platinum supported on the alumina have been carried out many years and made great progresses [7][8][9][10][11], the main method taken to modify the Pt based catalysts is to add some metals such as Re, In, Sn, Ga, Bi [12][13][14][15]. However, the catalysts still have some defects on the stability and activity.…”

Section: Introductionmentioning

confidence: 99%

Effect of K Addition on Catalytic Performance of PtSn/ZSM-5 Catalyst for Propane Dehydrogenation

et al. 2010

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PtSnK/ZSM-5 catalysts with different amounts of K were prepared by the sequential impregnation method on HZSM-5 zeolites, and their catalytic activities and stabilities in propane dehydrogenation were investigated. The effect of the addition of K on the physicochemical properties was studied by means of BET, XRD, SEM, NH 3 -TPD, TPR, and TPO. The results indicated that the addition of K had an obvious impact on the catalytic performance of the PtSn/ZSM-5 catalyst. A suitable amount of K could not only change the acid of the catalysts but also improve the relation between metals and the support, thus reduce the deactivation rate and increase the selectivity to propylene. It was found that the propylene selectivity and yield could reach the maximum when the content of K was 0.8%.

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Section: Introductionmentioning

confidence: 99%

Effect of K Addition on Catalytic Performance of PtSn/ZSM-5 Catalyst for Propane Dehydrogenation

et al. 2010

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“…It was reported in the literature [25] that the addition of sodium to PtSn/Al 2 O 3 increased the catalytic performance in the n-butane dehydrogenation reaction, which was attributed to a geometric modification of the metallic phase by the presence of sodium. Siri et al [26] investigated the effect of sodium promoter on catalytic properties of PtSn/c-Al 2 O 3 in the isobutene dehydrogenation, and found the addition of sodium improved the stability level of the catalysts. This behavior was explained that Na ?…”

Section: Introductionmentioning

confidence: 99%

Effect of Sodium Addition to PtSn/AlSBA-15 on the Catalytic Properties in Propane Dehydrogenation

et al. 2010

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The effect of Na addition to PtSn/AlSBA-15 on the catalytic properties in propane dehydrogenation was studied. The catalysts were characterized by XRF, BET, HR-TEM, NH 3 -TPD, TPO and TPR. Results showed that the presence of sodium could not only modify the acid function of the catalysts but also the structure of metallic phase, thus reduce the amount of coke deposition. Among the catalysts investigated, PtSnNa (1.0%)/AlSBA-15 had the best catalytic performance in terms of propane conversion and stability. The high catalytic performance may be owing to the strong interaction between metal and support.

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“…It is well established that improving catalytic performance and poisoning the acid sites of support can also be achieved by the addition of alkali or alkali earth metals to the catalyst formulation [21][22][23][24][25] for dehydrogenation catalysts. Tu and Chen [24] reported that the initial turnover frequencies were improved by adding alkaline earth metal ions to Cu/SiO 2 catalysts in the ethanol dehydrogenation, and the activity and stability of these systems varied according to the sequence: Mg [ Ca [ Sr [ Ba.…”

Section: Introductionmentioning

confidence: 99%

Influence of Calcium Addition on Catalytic Properties of PtSn/ZSM-5 Catalyst for Propane Dehydrogenation

et al. 2009

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In this work the influence of the Ca addition to PtSn/ZSM-5 catalyst on its performance for propane dehydrogenation was investigated. The catalysts were characterized by X-ray diffraction, BET analysis, TEM, NH 3 -TPD, TPO and TG. Results showed that the addition of calcium could not only modify the characteristics and properties of both acid and metal function but also suppress coke deposits on the catalyst. The addition of 0.9 wt% Ca to PtSn/ZSM-5 prompted catalytic activity. However, the incorporation of excessive Ca resulted in catalyst deactivation. TPR results implied that excessive Ca promoted the reduction of oxidized tin species to Sn 0 . The Sn 0 probably could interact with Pt to produce a PtSn alloy which led to the diminution of catalytic activity.

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PtSn/γ-Al2O3 isobutane dehydrogenation catalysts: The effect of alkaline metals addition

Cited by 65 publications

References 17 publications

Effect of K Addition on Catalytic Performance of PtSn/ZSM-5 Catalyst for Propane Dehydrogenation

Effect of K Addition on Catalytic Performance of PtSn/ZSM-5 Catalyst for Propane Dehydrogenation

Effect of Sodium Addition to PtSn/AlSBA-15 on the Catalytic Properties in Propane Dehydrogenation

Influence of Calcium Addition on Catalytic Properties of PtSn/ZSM-5 Catalyst for Propane Dehydrogenation

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