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

Zhang, Xiaodong; Han, Dong; Yin, Wen; Liu, Ning; Zuo, Yuanhui; Cui, Lifeng

doi:10.1016/j.cej.2015.08.064

Cited by 71 publications

(12 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…. In this sense, SBA-15 support is known to present very low acidity mainly given by the presence of silanol groups [32][33][34]. According to Table 1, it was observed that PtIr-SBA-15 catalyst was slightly acidic catalyst compared to the mesoporous carbon-based materials that present almost no acidity.…”

Section: Tpd Of Nh3mentioning

confidence: 99%

Bimetallic platinum/iridium modified mesoporous catalysts applied in the hydrogenation of HMF

et al. 2021

View full text Add to dashboard Cite

Catalytic transformation of 5-hydroxymethylfurfural (HMF) to produce 2,5-dimethylfuran (DMF) was studied over bimetallic (PtIr) and monometallic (Pt) catalysts supported on CMK-3 and SBA-15 mesoporous materials. The optimum temperature and hydrogen pressure for the maximum production of DMF were 120 °C and 15 atm, respectively. Increases in temperature and pressure decreased the selectivity to DMF. The catalysts were broadly characterized by different techniques, such as XRD, N2-isotherms, XPS, TPR, TEM and NH3-TPD. It was found that the metallic particles were well reduced and highly dispersed on the surface ofsupports having large surface areas and narrow pore size distributions. The PtIr alloy species catalytic sites were very active and selective towards the formation of the desired DMF. PtIr-CMK-3 catalyst showed an excellent activity, selectivity and stability to be applied in this process.

show abstract

Section: Tpd Of Nh3mentioning

confidence: 99%

Bimetallic platinum/iridium modified mesoporous catalysts applied in the hydrogenation of HMF

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The abundant surface oxygen atoms of the CuMn RC catalyst can react with the absorbed CO and thus lead to better catalytic activity in the Mars-van Krevelen type mechanism (MvK) which was frequently suggested for the metal oxides [40]. It was clear from the Table 3 and Fig.…”

mentioning

confidence: 70%

The choice of precursors in the synthesizing of CuMnOx catalysts for maximizing CO oxidation

2018

View full text Add to dashboard Cite

The hopcalite (CuMnOx) catalyst is a well-known catalyst for CO oxidation at a low temperature and it is synthesized by the co-precipitation method with different types of precursors. Activity of the CuMnOx catalysts for CO oxidation is strongly dependent upon the combination of precursors, ranking in order {Mn(Ac) 2 + Cu(NO 3 ) 2 } > {Mn(Ac) 2 + Cu(Ac) 2 } > {Mn(N O 3 ) 2 + Cu(NO 3 ) 2 } > {Mn(NO 3 ) 2 + Cu(AC) 2 }. All the precursors were precipitated by KMnO 4 solution and the precursors mostly comprised of MnO 2 , Mn 2 O 3 and CuO phases. Keeping the same precipitant while changing the precursors caused a change in the lattice oxygen mobility which influenced the CO oxidation activity. The calcination strategy of the precursors has great influence on the activity of resulting catalysts. The reactive calcination (RC) conditions produce multifarious phenomena of CO oxidation and the precursor decomposition in a single-step process. The activity order of the catalysts for CO oxidation was as follows: reactive calcination (RC) > flowing air > stagnant air. Therefore, we recommended that the RC route was the more appropriate calcination route for the production of highly active CuMnOx catalysts. All the catalysts were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller analysis, X-ray photoelectron spectroscopy and scanning electron microscopy technique. The influence of precursors on the structural properties and the catalytic activity of co-precipitation derived binary CuMnOx catalysts for CO oxidation has been investigated.

show abstract

“…The TOFs per total amount of silver were comparable with values reported in literature. [48,57] The reaction order of carbon monoxide was higher than oxygen, indicating a lower CO coverage at the silver surface. For 15 Ag_SN_SS-1CO, the difference in T X = 50% between the heating and cooling was 15 °C for both gas flow Table 2.…”

Section: Co Oxidationmentioning

confidence: 99%

Utilization of Silver Silicate for the Formation of Highly Dispersed Silver on Silica Catalysts

2022

View full text Add to dashboard Cite

Supported silver catalysts with small and uniform particle sizes are promising for selective hydrogenation or oxidation reactions. However, during catalyst preparation, transport of the silver precursors often leads to large silver particles, especially at higher silver loadings. In this paper, the use of silver silicate as an intermediate for the preparation of silica-supported silver nanoparticles is reported. Supported silver silicate was prepared by reacting silver nitrate with silica. Subsequently, the silver silicate was reduced to prepare supported silver nanoparticles of ~2 nm in size at a loading of 15 wt% Ag. The utilization of silver silicate limited the transport of silver species during precursor decomposition, resulting in silver nanoparticles 20 times smaller than those formed by direct reduction of a supported silver nitrate precursor. The catalysts were applied in carbon monoxide oxidation, which confirmed the high dispersion as well as the excellent stability of the supported silver nanoparticles thus prepared.

show abstract

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

Cited by 71 publications

References 41 publications

Bimetallic platinum/iridium modified mesoporous catalysts applied in the hydrogenation of HMF

Bimetallic platinum/iridium modified mesoporous catalysts applied in the hydrogenation of HMF

The choice of precursors in the synthesizing of CuMnOx catalysts for maximizing CO oxidation

Utilization of Silver Silicate for the Formation of Highly Dispersed Silver on Silica Catalysts

Contact Info

Product

Resources

About