Role of the Al chemical environment in the formation of silver species and its CO oxidation activity

Qu, Zhenping; Zhang, Xiaodong; Yu, Fangli; Liu, Xianchun; Fu, Qiang

doi:10.1016/j.jcat.2014.11.005

Cited by 29 publications

(32 citation statements)

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“…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%

“…Ordered mesoporous silica and heteroatoms incorporated mesoporous silica materials are both considered a good catalyst support with large surface area and well-defined pore size [1,4,26,28,29]. Recently, Al incorporated mesoporous silica materials (aluminosilicate) with acidic and defect sites have attracted great attention [4,26].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Al incorporated mesoporous silica materials (aluminosilicate) with acidic and defect sites have attracted great attention [4,26]. A variety of Ag species supported on mesoporous silica and aluminosilicate supports have been studied for http://dx.doi.org/10.1016/j.cej.2015.08.064 1385-8947/Ó 2015 Elsevier B.V. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

“…It is found that Ag/silica catalysts show excellently high activity in CO oxidation at room temperature [6,9]. Further studies indicated that the incorporation of Al in SBA-15 has positive effect on the structural and textural characteristics of catalysts [4,26]. A large number of Al atoms are introduced into mesoporous frameworks of SBA-15 using ''pH-adjusting" method with aluminum isopropoxide [4] and Al 2 (SO 4 ) 3 Á18H 2 O [26] as alumina sources.…”

Section: Introductionmentioning

confidence: 99%

“…Further studies indicated that the incorporation of Al in SBA-15 has positive effect on the structural and textural characteristics of catalysts [4,26]. A large number of Al atoms are introduced into mesoporous frameworks of SBA-15 using ''pH-adjusting" method with aluminum isopropoxide [4] and Al 2 (SO 4 ) 3 Á18H 2 O [26] as alumina sources. The catalytic performance for CO oxidation [4] and selective CO oxidation [26] of Ag/ Al-SBA-15 catalyst were investigated, respectively.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Self Cite

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Bimetallic Effects of Silver‐Modified Nickel Catalysts and their Synergy in Glycerol Hydrogenolysis

Chen

Zhang

et al. 2016

ChemCatChem

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A series of Ag‐modified Ni catalysts was prepared, and the role of bimetallic effects on the selective cleavage of C−O and C−C bonds was investigated in glycerol hydrogenolysis, a model reaction for the utilization of biomass‐derived polyols. Compared to Raney Ni, the optimal Raney Ni6Ag catalyst was more active in glycerol conversion and efficient for C−O bond cleavage to afford a higher selectivity toward C3 products (1,2‐propanediol and lactic acid; 88 %) at the same ∼70 % conversion of glycerol, especially 1,2‐propanediol (73 %). On Ni catalysts, the hydrogenation of adsorbed species was the most likely rate‐limiting step in glycerol hydrogenolysis under alkaline conditions. The Ag additive enhanced the hydrogenation ability of Ni catalysts, which should be related to the higher strength of the adsorption of hydrogen and the lower strength of the adsorption of substrates on Ni sites because of the formation of Ni‐Ag alloys. A mechanistic interpretation was presented for the excellent catalytic behavior.

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Identifying the Active Silver Species in Carbonylation of Dimethyl Ether over Ag−HMOR

Cai

Liu

et al. 2020

ChemCatChem

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As one of the key steps in ethanol production from syngas, dimethyl ether (DME) carbonylation to methyl acetate (MA) catalyzed by zeolite has drawn much attention. H‐mordenite (HMOR) modified with metal has been continuously developed for improving catalytic performance. Here, we investigated the role of Ag species through three series of Ag−HMOR catalysts prepared through altering Ag loading, varying reduction temperature and additional ion exchange. TEM, XPS, CO FTIR and UV‐Vis spectroscopy were employed to identify the nature and the amount of Ag species in xAg−HM with different Ag loading. Taken together with catalytic performance evaluation, 5Ag−HM with the moderate size of Ag0 species (Agnδ+ and Agm clusters) was proved to have greatest promotion effect on DME carbonylation. This was also evidenced by further improved MA formation rate over catalysts via elevating reduction temperature or via additional NH4Cl ion exchange, which contained more Ag0 and fewer Ag+ species respectively. These provide insight into metal‐modified HMOR, inspiring design and fabrication of zeolite catalysts with multi‐active sites.

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Role of the Al chemical environment in the formation of silver species and its CO oxidation activity

Cited by 29 publications

References 50 publications

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

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

Bimetallic Effects of Silver‐Modified Nickel Catalysts and their Synergy in Glycerol Hydrogenolysis

Identifying the Active Silver Species in Carbonylation of Dimethyl Ether over Ag−HMOR

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