Formation of silver active states in Ag/ZSM-5 catalysts for CO oxidation

Kolobova, Ekaterina; Pestryakov, Alexey; Shemeryankina, A.; Kotolevich, Yulia; Martynyuk, O.; Tiznado, H.; Bogdanchikova, Nina

doi:10.1016/j.fuel.2014.07.011

Cited by 42 publications

(35 citation statements)

References 52 publications

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“…For Ag/Al-SBA-15 (25) catalyst the beneficial effect of Al 3+ on metal dispersion and catalytic activity is counterbalanced by Ag 2 O formed. Further increase in the Al content (Al-SBA-15 (10,5)) causes the agglomeration of Ag particles on the catalyst surface. Moreover, H 2 -TPR results (Fig.…”

Section: Effect Of Al On the Structure And Catalytic Activities Of Sumentioning

confidence: 99%

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Study of catalytic activity at the Ag/Al-SBA-15 catalysts for CO oxidation and selective CO oxidation

Zhang

Han

Yin

et al. 2016

Chemical Engineering Journal

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Section: Effect Of Al On the Structure And Catalytic Activities Of Sumentioning

confidence: 99%

“…There are many factors affecting its catalytic activity; e.g. the size and state of noble metal species [1][2][3][4][5], preparation methods [6][7][8], and pretreatment conditions [9][10][11][12][13]. However, they are often inter-related depending on choice of the support [1].…”

Section: Introductionmentioning

confidence: 99%

Study of catalytic activity at the Ag/Al-SBA-15 catalysts for CO oxidation and selective CO oxidation

Zhang

Han

Yin

et al. 2016

Chemical Engineering Journal

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“…The use of metal Lewis acids broadens the range of catalytic applications, for example, hydroisomerization reactions, [15] selectivec atalytic reduction (SCR) in catalytic converters, [16] and the productiono ff ine chemicals, [17] among others. Herein, we examineA g-exchanged MFI (Ag-ZSM-5),w hich has provent o be an active catalyst forS CR, [18] CO oxidation, [19] and alkane aromatization [20] reactions. The activity of Ag-ZSM-5 catalysts is attributed, in part, to the redox and acidic properties of Ag species.…”

Section: Introductionmentioning

confidence: 99%

Silver‐Promoted Dehydroaromatization of Ethylene over ZSM‐5 Catalysts

et al. 2017

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The shape selectivity of ZSM‐5 (MFI type) catalysts is ideal for the production of C6–C8 aromatics. Developing high‐performance zeolite catalysts with improved selectivity to aromatics, particularly from diversified (non‐petroleum) feedstocks, has broad commercial appeal. Non‐oxidative coupling (NOC) of ethylene was examined over Ag‐ZSM‐5 catalysts at 400 °C and shows that Ag+ sites promote dehydroaromatization with enhanced selectivity to toluene and xylenes. Metal exchange of H‐ZSM‐5 results in Ag zoning wherein Ag+ site density is higher on the exterior of ZSM‐5 particles. Catalyst performance was characterized with varying Ag loading as well as the use of methane co‐feed. Aromatic selectivity is about 60 % on Ag‐ZSM‐5 compared to 20 % on H‐ZSM‐5, which is qualitatively consistent with density functional theory (DFT) showing that ethylene forms strong complexes with Ag+ (Lewis acid) sites. DFT calculations also reveal that ethylene activation on H+ (Brønsted acid) sites is more energetically favorable, and likely constitutes the first mechanistic step in ethylene‐to‐liquids (ETL) reactions. Ag‐ZSM‐5 is thus identified as an effective catalyst for low‐temperature ETL reactions that has the potential to outperform conventional metal‐exchanged zeolites.

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“…Ag-supported catalysts have been extensively used in NOx abatement [25], the selective catalytic reduction of NO [26], the selective catalytic oxidation of ammonia [27], CO oxidation [28] or ethylene epoxidation [29] as well as in hydrogenation of C=O groups in the presence of a C=C bond [30]. Moreover, silver plays also very important role in bimetallic catalytic systems [31,32].…”

Section: Introductionmentioning

confidence: 99%