Synergistic Pt/MgO/SBA-15 nanocatalysts for glycerol oxidation in base-free medium: Catalyst design and mechanistic study

Yan, Hao; Qin, Hansong; Feng, Xiang; Jin, Xin; Liang, Wei; Sheng, Nan; Chen, Zhu; Wang, Hongmei; Yin, Bangtang; Liu, Yibin; Chen, Xiaobo

doi:10.1016/j.jcat.2019.01.015

Cited by 62 publications

(59 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(6) Water formed and the active Au sites were recovered. This mechanism was in accordance with the key reaction steps proposed by Comotti et al [87] and the DFT calculation results reported in the literature [83].…”

Section: Reaction Mechanismsupporting

confidence: 92%

See 1 more Smart Citation

Structural sensitivity of heterogeneous catalysts for sustainable chemical synthesis of gluconic acid from glucose

Yan

Zhang

Sun

et al. 2020

Chinese Journal of Catalysis

Self Cite

View full text Add to dashboard Cite

Section: Reaction Mechanismsupporting

confidence: 92%

“…Glucose molecules coordinated on the basic sites on the surface of the catalyst via carbonyl groups. (2) The adsorbed glucose molecule reacted with water to form the RCH(OH)2 intermediate[82][83][84]. (3)The RCH(OH)2 intermediate coordinated to the Au species via Au-H bonds and formed an unstable hydride.…”

mentioning

confidence: 99%

Structural sensitivity of heterogeneous catalysts for sustainable chemical synthesis of gluconic acid from glucose

Yan

Zhang

Sun

et al. 2020

Chinese Journal of Catalysis

Self Cite

View full text Add to dashboard Cite

“…35 A small characteristic peak located at~40 is attributed to the existence of MgO with uniform distribution (Figure S2b), which is in accordance with the EDX-mapping result. 16 The type IV isotherms for N 2 adsorption also confirm the existence of mesoporous MgO/SBA-15 supports with a pore-size distribution concentrated at~7.8 nm (Figure S3). 36 The MgO/SBA-15 supports with less MgO doping content (especially Mg/Si < 0.1) possess sufficient specific surface area (>600 m 2 /g) and pore volume (>0.7 cm 3 /g), promoting the uniform distribution of AuPt alloy nanoparticles (Table S3).…”

Section: Dft Calculationsmentioning

confidence: 58%

“…For CO 2 -TPD, 0.1 g sample was pre-processed at 550 C in 100 ml/min He for 3 hr. 16 After the temperature drops to room temperature, CO 2 was purged into the quartz tube until adsorption equilibrium. He (100 ml/ min) was then purged to remove the gas phase CO 2 .…”

Section: Catalyst Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Au‐Promoted Pt nanoparticles supported on MgO/SBA‐15 as an efficient catalyst for selective oxidation of glycerol

et al. 2021

Self Cite

View full text Add to dashboard Cite

A systematic study of Au-promoted and unpromoted Pt/MgO/SBA-15 catalyst is developed to separate the promoter effect from electron transfer effect between Au and Pt. Multi-characterizations revealed that Au and Pt metals in these bimetallic catalysts mainly exist in the form of alloy, and the main role of Au is to reduce the size of AuPt alloy nanoparticles, thus enhancing the adsorption and activation of intermediate products. Through the optimization of various factors (including MgO content, Au/Pt molar ratio, reaction temperature and time), the Au 1 Pt 2 /MgO/SBA-15 (0.05) catalyst exhibits excellent catalytic activity and glyceric acid selectivity for the selective oxidation of glycerol. Density functional theory calculation confirmed that the synergistic effect between Pt and Au active sites could facilitate the oxidation of primary hydroxyl group by promoting the activation of C H bond and the oxidation of aldehyde group. The results may give insights on designing effective Pt based bimetallic catalyst for selective oxidation of glycerol.

show abstract

Kinetics decoupling activity and selectivity of Pt nanocatalyst for enhanced glycerol oxidation performance

et al. 2021

View full text Add to dashboard Cite

Herein, we demonstrate a kinetics and a mechanistic strategy to disentangle the origins of the significantly improved activity and selectivity of Pt‐catalyzed glycerol oxidation. The unchanged reactant reaction orders and activation energies suggest the same kinetics despite variable Pt particle sizes, based on which a Michaelis–Menten kinetics treatment is conducted to individually quantify the number and activity of Pt active site. Together with multiple characterization results, the volcano‐shaped activity is mainly arising from the quantity change of Pt active site. Moreover, the atomic structure of bimetallic Pt─Sb catalyst is well elucidated by the formation of Pt─SbO interface along with partial Sb incorporation into Pt lattice, chelating with glycerol to poison Pt active sites for primary hydroxyl activation while creating interfacial site for second hydroxyl activation, further evidenced by kinetics shift. The kinetics strategy could be extended to other metal catalysts with simultaneously high activity and selectivity.

show abstract

Synergistic Pt/MgO/SBA-15 nanocatalysts for glycerol oxidation in base-free medium: Catalyst design and mechanistic study

Cited by 62 publications

References 47 publications

Structural sensitivity of heterogeneous catalysts for sustainable chemical synthesis of gluconic acid from glucose

Structural sensitivity of heterogeneous catalysts for sustainable chemical synthesis of gluconic acid from glucose

Au‐Promoted Pt nanoparticles supported on MgO/SBA‐15 as an efficient catalyst for selective oxidation of glycerol

Kinetics decoupling activity and selectivity of Pt nanocatalyst for enhanced glycerol oxidation performance

Contact Info

Product

Resources

About