Yao Sheng’s research while affiliated with Nanyang Normal University and other places

What is this page?


This page lists works of an author who doesn't have a ResearchGate profile or hasn't added the works to their profile yet. It is automatically generated from public (personal) data to further our legitimate goal of comprehensive and accurate scientific recordkeeping. If you are this author and want this page removed, please let us know.

Publications (17)


XRD patterns of the SBA‐15, P/SBA‐500, CeP/SBA‐T and Ce/SBA‐500 samples.
(a) N2 sorption isotherms and (b) BJH pore size distributions of the SBA‐15, P/SBA‐500, CeP/SBA‐T and Ce/SBA‐500 samples.
Pyridine‐FTIR difference spectra of the SBA‐15, P/SBA‐500, CeP/SBA‐T and Ce/SBA‐500 samples.
(a) NH3‐TPD and (b) CO2‐TPD profiles of the SBA‐15, P/SBA‐500, CeP/SBA‐T and Ce/SBA‐500 samples.
Catalytic performance under the conditions of 280 °C, LHSV=0.6 mL g⁻¹ h⁻¹, and methanol/catechol=5. (a) catechol conversion and (b) product selectivity of the SBA‐15, P/SBA‐500, CeP/SBA−T and Ce/SBA‐500 catalysts.

+3

Highly Active and Stable P2O5 Catalysts Supported on Mesoporous Silica Promoted with Ce for the O‐Methylation of Catechol
  • Article
  • Publisher preview available

July 2024

·

15 Reads

Runduo Hong

·

Yao Sheng

·

Linkai Zhou

·

[...]

·

Xueguang Wang

P2O5 has been widely used as an acid‐base catalyst for the O‐methylation of catechol to guaiacol due to its suitable acid strength; however, its stability, which is a significant concern for industrial applications, has not seen significant breakthroughs. Herein, we developed a facile impregnation strategy to synthesize Ce promote P2O5 supported on mesoporous silica (CeP/SBA). The CeP/SBA‐500 carbonized at 500 °C exhibited the highest catalytic activity with a catechol conversion of 71.5 %. The high activity stems from the addition of Ce, forming CePO4, which exhibits improved surface acidity compared to P2O5. Importantly, chemisorption and in situ infrared studies revealed that CePO4 shows stronger adsorption of catechol, which then rapidly converts to guaiacol. The CeP/SBA‐500 exhibits excellent stability with no activity decrease after 10 h of continuous flow reaction, attributed to the absence of a decrease in CePO4 surface acidity.

View access options

Figure 4. TEM images of (a) Ni/CaO, (b) Li-Ni/CaO, (c) Na-Ni/CaO, and (d) K-Ni/CaO DFMs.
Figure 8. Twenty cycles of integrated CO2 capture and hydrogenation of the Na-Ni/CaO DFM. Temperature: 650 °C; GHSV: 6000 mL·g −1 ·h −1 .
Physicochemical properties of the reduced Ni/CaO and M-Ni/CaO (M = Li, Na, and K) DFMs.
The integrated CO 2 capture and hydrogenation performance of Ni/CaO and M-Ni/CaO (M = Li, Na, and K) DFMs at 650 • C.
The Effect of Alkali Metals (Li, Na, and K) on Ni/CaO Dual-Functional Materials for Integrated CO2 Capture and Hydrogenation

August 2023

·

83 Reads

·

7 Citations

Materials

Ni/CaO, a low-cost dual-functional material (DFM), has been widely studied for integrated CO2 capture and hydrogenation. The core of this dual-functional material should possess both good CO2 capture–conversion performance and structural stability. Here, we synthesized Ni/CaO DFMs modified with alkali metals (Na, K, and Li) through a combination of precipitation and combustion methods. It was found that Na-modified Ni/CaO (Na-Ni/CaO) DFM offered stable CO2 capture–conversion activity over 20 cycles, with a high CO2 capture capacity of 10.8 mmol/g and a high CO2 conversion rate of 60.5% at the same temperature of 650 °C. The enhanced CO2 capture capacity was attributed to the improved surface basicity of Na-Ni/CaO. In addition, the incorporation of Na into DFMs had a favorable effect on the formation of double salts, which shorten the CO2 capture and release process and promoted DFM stability by hindering their aggregation and the sintering of DFMs.



Water-induced synthesis of Pd nanotetrahedrons on g-C3N4 for highly efficient hydrogenation of nitroaromatic

February 2023

·

38 Reads

·

6 Citations

Colloids and Surfaces A Physicochemical and Engineering Aspects

g-C3N4 supported Pd nanotetrahedrons (Pd NTs@g-C3N4) are first prepared by an in-situ growth method with water-induced process. The unique Pd nanotetrahedrons with four (111) facets exposed have been prepared by simply varying the dosage of water without the other synthesis condition changed. The optimized Pd NTs@gC3N4 exhibits higher activity (TOF value: 51462 h− 1 ) toward the hydrogenation of nitrobenzene with respect to the commercial Pd/C. The enhanced activity is attributed to the small size and tetrahedral shape with higher surface energy and more active surface. Most importantly, the Pd NTs@g-C3N4 still shows excellent activity and selectivity for nitrobenzene hydrogenation without obviously deactivation after ten cycles. In addition, the vertical and parallel adsorption behaviors of nitrobenzene molecules on Pd (111) surface are analyzed in detail using the density functional theory (DFT) method, and the interaction mechanism between nitrobenzene and palladium is studied by the charge density difference method.


Figure 3. TPD profiles of (a,b) NH3-TPD and (c,d) CO2-TPD of APO catalysts with different P/Al ratios and calcination temperatures.
Figure 4. FT-IR spectra after pyridine adsorption of APO catalysts with (a) different P/Al ratios and (b) calcination temperatures.
Figure 7. (a) Stability test of APO(0.7)-475 for the selective O-methylation of catechol with DMC to guaiacol. Reaction condition: 3 g APO catalyst, molar ratio of catechol to DMC = 1: 6, 300 ° C, LHSV = 0.4 h −1 . (b) TG profiles of the fresh and spent APO(0.7)-475.
Physico-chemical characteristics of APO catalysts.
Efficient and Stable O-Methylation of Catechol with Dimethyl Carbonate over Aluminophosphate Catalysts

January 2023

·

102 Reads

Catalysts

The O-methylation of catechol is an effective method for the industrial production of guaiacol used as an important chemical. However, the low catechol conversion and poor catalyst stability are the most critical issues that need to be addressed. Herein, the O-methylation of catechol with dimethyl carbonate was investigated over aluminophosphate (APO) catalysts, using a continuous-flow system to produce guaiacol. APO catalysts were synthesized with varying P/Al molar ratios and calcination temperatures to study their effects on catalytic performance for the reaction. The physico-chemical properties of the APO catalysts were thoroughly investigated using XRD, NH3-TPD, CO2-TPD, FTIR, and Py-FTIR. The P/Al molar ratio and catalyst calcination temperature significantly influenced the structure and texture, as well as the surface acid-base properties of APO. Both the medium acid and medium base sites were observed over APO catalysts, and the Lewis acid sites acted as the main active sites. The APO (P/Al = 0.7) exhibited the highest catalytic activity and excellent stability, due to the suitable medium acid-base pairs.


Rh promotional effects on Pt–Rh alloy catalysts for chemoselective hydrogenation of nitrobenzene to p-aminophenol

September 2022

·

34 Reads

·

33 Citations

Chemical Engineering Journal

Hydrogenation of nitrobenzene to p-aminophenol over solid metal catalysts in acid medium is a sustainable and efficient protocol. However, it is challenging to fabricate such a catalyst that can achieve both high activity and unparalleled selectivity. Herein, a facile incipient wetness impregnation strategy is proposed and employed to synthesize an activated carbon supported Pt–Rh alloy catalyst. The Pt–Rh/AC catalyst exhibits simultaneously improved activity (TOF value: 10872 h⁻¹) and p-aminophenol selectivity (ca. 95.4%). The enhanced activity is attributed to the formation of well dispersed Pt–Rh bimetallic nanoparticles caused by the promoting effect of Rh for the reduction of Pt²⁺. Chemisorption and in situ infrared studies reveal that Pt–Rh bimetallic nanoparticles surfaces were enriched by Pt accompanying with possible electron transfer from Rh to Pt. The density functional theory calculations suggest that the adsorption of generated phenylhydroxylamine intermediate was inhibited over electron-rich Pt to avoid its subsequent hydrogenation to form aniline, resulting in excellent selectivity for p-aminophenol.


Figure 1. (a) XRD patterns of P-ACC, 1%Pt/ACC, and 1%Pt/xP-ACC. TEM images of (b) 1%Pt/ACC, (c) 1%Pt/3P-ACC, (d) 1%Pt/5P-ACC, and (e) 1%Pt/7P-ACC. (f) HAADF-STEM image of 1%Pt/5P-ACC and elemental mapping images of Pt and P.
Figure 2. (a) Pt 4f XPS spectra of the 1%Pt/ACC and 1%Pt/xP-ACC samples. (b) P 2p XPS spectra of the P-ACC, 1%Pt/ACC, and 1%Pt/ xP-ACC samples.
Figure 3. H 2 -TPD profiles of the 1%Pt/ACC and 1%Pt/xP-ACC samples.
Figure 4. Effects of (a) the reaction time, (b) the surfactant, (c) the acid concentration, and (d) the temperature on the hydrogenation of NB to PAP using the 1%Pt/5P-ACC catalyst.
Comparison of Different Reported Catalysts for This Reaction
Phosphorus-Doped Activated Coconut Shell Carbon-Anchored Highly Dispersed Pt for the Chemoselective Hydrogenation of Nitrobenzene to p -Aminophenol

March 2022

·

54 Reads

·

18 Citations

ACS Omega

Highly dispersed Pt nanoparticles (∼2.5 nm) on phosphorus-doped activated coconut shell carbon (Pt/P-ACC) were synthesized by a two-step impregnation route. Pt/P-ACC showed a high activity, chemoselectivity, and reusability toward the hydrogenation of nitrobenzene to p-aminophenol, with hydrogen as the reducing agent in sulfuric acid. The effects of P species on the catalyst structure, surface properties, and catalytic performance were investigated. It was found that the Pt/P-ACC catalyst had an excellent catalytic activity due to its smaller Pt nanoparticles and higher content of surface-active metal compared with Pt/ACC. Besides, the experimental results and in situ infrared studies demonstrated that the interaction effect between the Pt and P species imbued the surface of Pt with an electron-rich feature, which decreased the adsorption of electron-rich substrates (that is, phenylhydroxylamine) and prevented their full hydrogenation, leading to enhanced selectivity during the hydrogenation of nitrobenzene to p-aminophenol.


(a) N2 sorption isotherms and (b) BJH pore size distributions of SiO2, C@SiO2, Cu/C@SiO2, Ni/C@SiO2, and Ni1Cux/C@SiO2 catalysts, (c) Raman spectra of the Ni/C@SiO2 and Ni1Cux/C@SiO2 catalysts, and (d) XRD patterns of Ni1Cu0.24‐H2@SiO2, Cu/C@SiO2, Ni/C@SiO2, and Ni1Cux/C@SiO2 catalysts.
TEM images of (a) Ni/C@SiO2, (b) Ni1Cu0.12/C@SiO2, (c) Ni1Cu0.24/C@SiO2, (d) Ni1Cu0.36/C@SiO2, (e) Cu/C@SiO2, and (f) HRTEM of Ni1Cu0.24/C@SiO2.
HAADF‐STEM images of Ni1Cu0.24/C@SiO2 (a) HAADF spectrum, (b) Elemental mapping images, (c) Compositional line scan profile of Ni and Cu nanoparticles, and (d) EDS elemental analysis.
XPS spectra of the Ni/C@SiO2 and Ni1Cux/C@SiO2 catalysts (a) Ni 2p XPS spectra, (b) the percentage of Ni⁰ in Ni 2p region, (c) Cu 2p XPS spectra, and (d) the percentage of Cu⁰ in Cu 2p region.
Recyclability texts of the prepared catalysts for the hydrogenation of nitrobenzene (a) Ni1Cu0.24/C@SiO2, (b) Ni/C@SiO2.
Effect of Cu Content on Structure of NiCu Alloy Catalyst and Catalytic Performance for Nitroarenes Hydrogenation

February 2022

·

21 Reads

·

1 Citation

Carbon doped silica‐supported NiCu alloy nanoparticles (Ni1Cux/C@SiO2) with different Cu/Ni molar ratio (x=0.12, 0.24, 0.36) were fabricated via one‐step impregnation, following in situ carbonization reduction. Effects of Cu content on catalyst structure, surface properties and particle sizes were investigated by Brunauer‐Emmett‐Teller (BET), inductively coupled plasma (ICP), Raman, X‐ray diffraction (XRD), transmission electron microscopy (TEM) and X‐ray photoelectron spectroscopy (XPS). The surface Ni⁰ content increased with increasing Cu content, but showed a maximum at 0.24 of Cu/Ni molar ratio, because the smaller NiCu alloy nanoparticle formed and the segregation of antioxidative Cu atoms on the surface protected the metallic Ni from oxidation. The Ni1Cux/C@SiO2 were investigated for nitrobenzene hydrogenation with H2. The optimal Ni1Cu0.24/C@SiO2 catalyst with the highest Ni⁰ content showed markedly improved catalytic activity compared to monometallic Ni/C@SiO2. The Ni⁰ species were the active sites for the hydrogenation of nitrobenzene. The Ni1Cu0.24/C@SiO2 could transform various substituted nitroarenes to corresponding aromatic amines. Moreover, the Ni1Cu0.24/C@SiO2 could be recycled for 8 times without decrease in catalytic performance, exhibiting superior anti‐oxidation and anti‐leaching abilities.


Efficient and recyclable bimetallic Co−Cu catalysts for selective hydrogenation of halogenated nitroarenes

December 2021

·

17 Reads

·

19 Citations

Journal of Alloys and Compounds

Silica supported N-doped carbon layers encapsulating Co−Cu nanoparticles (Co1Cux@CN/SiO2) were prepared by a one-step impregnation of Co(NO3)2·6H2O, Cu(NO3)2·3H2O, urea and glucose, following in situ carbothermal reduction. Effects of Cu contents on the catalytic performance of the Co1Cux@CN/SiO2 catalysts were investigated for selective hydrogenation of p-chloronitrobenzene to p-chloroaniline. The Co1Cu0.30@CN/SiO2 with Cu/Co molar ratio of 0.30:1 presented much higher activity and stability than the monometallic [email protected]/SiO2 catalyst. The addition of Cu into Co1Cux@CN/SiO2 catalysts had favorable effects on the formation of highly active Co−N sites and N-doped carbon layer. The role of the N-doped carbon layer was to protect the Co from oxidation by air, and the Co1Cu0.30@CN/SiO2 could be reused for at least 12 cycles without decrease in catalytic efficiency. Mechanistic and in situ infrared studies revealed that the interaction effect between the Co and Cu atoms made the surface of Co highly electron rich, which decreased adsorption of halogen groups and resulting in the enhanced selectivity during chemoselective hydrogenation of halogenated nitroarenes for a wide scope of substrates.


Highly efficient non-noble metallic NiCu nanoalloy catalysts for hydrogenation of nitroarenes

August 2021

·

45 Reads

·

16 Citations

Highly dispersed NiCu alloy nanoparticles supported on carbon-doped silica (NiCu/[email protected]) were first prepared through one-step impregnation with a mixed solution of nickel nitrate, cupric nitrate and glucose, followed by in situ carbothermal reduction. The addition of Cu to the NiCu/[email protected] materials not only improved the dispersion of metallic Ni particles, but also significantly enhanced the anti-oxidation ability of the catalyst. The effects of catalyst calcination temperatures and Cu element on the catalytic properties of the NiCu/[email protected] materials were investigated for nitrobenzene hydrogenation as a model reaction. The results indicated that the NiCu/[email protected] catalyst carbonized at 800 °C exhibited the highest activity for the hydrogenation of nitrobenzene with a turnover frequency (TOF) of as high as 46.5 s-1, and the superior catalytic activity of NiCu/[email protected] to Ni/[email protected] could be attributed to both the smaller Ni particles and the higher TOFs of metallic Ni due to the electronic interaction between the Ni and Cu atoms. The NiCu/[email protected] catalyst could be recycled at least 10 times without noticeable loss of catalytic performance in the hydrogenation of nitrobenzene, exhibiting better stability compared with the Ni/[email protected] catalyst. Moreover, the NiCu/[email protected] catalyst could smoothly transform various substituted nitro aromatics to the corresponding aromatic amines with high selectivities.


Citations (14)


... iii Alkali metal catalysts Alkali metals, categorized within Group 1A of the periodic table, encompass elements like Li, Na, and K. Multiple studies have evidenced the effectiveness of alkali metal catalysts in tar steam reforming, contributing to improved syngas quality [176,177]. However, a significant drawback of these catalysts lies in their tendency to vaporize at typical gasification reaction temperatures and the challenges involved in their downstream recovery. ...

Reference:

A review of cleaning technologies for biomass-derived syngas
The Effect of Alkali Metals (Li, Na, and K) on Ni/CaO Dual-Functional Materials for Integrated CO2 Capture and Hydrogenation

Materials

... Numerous efforts have been dedicated to resolving this sintering issue. In previous studies, we successfully applied a three-dimensional Ni/CaO network composed of mesopores and macropores in a stable high-temperature ICCU process thanks to its unique porosity structure [28,29]. Recently, the doping approach of DFMs with alkali metals, such as Li, Na, K, and Cs, has been considered a promising strategy to promote the ICCU process. ...

Catalytic Synthesis of CO by Combining CO 2 Capture and Hydrogenation over Three-Dimensional Ni/CaO Networks
  • Citing Article
  • May 2023

Energy & Fuels

... Aniline is an important intermediate in syntheses of organic chemical raw materials that are widely used in organic dyes, pesticides, pharmaceuticals and textiles. [1][2][3][4][5][6][7] Nitrobenzene hydrogenation is a common method for industrial aniline production. Traditional metal catalysts generally have high catalytic activity, but oen have poor stability and cannot be reused. ...

Water-induced synthesis of Pd nanotetrahedrons on g-C3N4 for highly efficient hydrogenation of nitroaromatic
  • Citing Article
  • February 2023

Colloids and Surfaces A Physicochemical and Engineering Aspects

... For the us-PtRuPNiO@TiO x catalyst, the energy barrier for the direct pathway (∼4 eV) was higher than that for the indirect pathway (1.76 eV), demonstrating that the indirect pathway is more plausible. 23,24 The detailed pathways are shown in Figure 3B,C. It is well known that color of the 4-NP solution changes from light yellow to bright yellow after the addition of a reducing agent owing to the formation of 4-nitrophenolate. ...

Rh promotional effects on Pt–Rh alloy catalysts for chemoselective hydrogenation of nitrobenzene to p-aminophenol
  • Citing Article
  • September 2022

Chemical Engineering Journal

... A comparison of the conversion and selectivity of dissimilar catalysts ( Figure 3F) showed that us-PtRuPNiNiO@TiO x has the highest catalytic efficiency among the reported Pt-based catalysts. [22][23][24][25][26][27] ...

Phosphorus-Doped Activated Coconut Shell Carbon-Anchored Highly Dispersed Pt for the Chemoselective Hydrogenation of Nitrobenzene to p -Aminophenol

ACS Omega

... Thus, the hydrogenation reaction has become crucial for a sustainable chemical industry. The reason for that is its series of advantages including the use of molecular hydrogen [14,15] to overcome the issues associated with other mild reducing agents, [16] such as sodium borohydrate [17-19], which produces sodium borate as a byproduct, or hydrazine hydrate [20], which, although interesting for being capable of generating hydrogen in situ, has toxicity and safe handling issues that limit its industrial application [6]. Moreover, heterogeneous metal catalysts can be easily separated and reused. ...

Efficient and recyclable bimetallic Co−Cu catalysts for selective hydrogenation of halogenated nitroarenes
  • Citing Article
  • December 2021

Journal of Alloys and Compounds

... In the reaction, NiO acted as the reducing agent and CoO as an oxidizing agent. NiO could donate electrons to CoO, thereby reducing CoO to Co metal [68], which can act as an additional catalyst and improve the overall reaction kinetics and H 2 generation rate. Another reason for enhanced catalytic activity could be the synergistic effects between the Ni and Co. ...

Highly efficient non-noble metallic NiCu nanoalloy catalysts for hydrogenation of nitroarenes

... Moreover, Mo carbides also are the active phases, owning similar catalytic properties with the precious metals because of the introduction of carbon atoms [11][12][13][14][15][16][17][18] . They have been applied in hydrogenation [19][20][21][22][23] , steam reforming of methanol [24] , and water gas shift reaction [25] . Among them, β-Mo 2 C demonstrated excellent activity and selectivity in CO 2 reduction [26] , hydrogen production [27] , and hydrodeoxygenation reactions [28] . ...

One-step synthesis of mesoporous alumina-supported molybdenum carbide with enhanced activity for thiophene hydrodesulfurization
  • Citing Article
  • May 2021

Journal of Environmental Chemical Engineering

... Nevertheless, heterogeneous catalysts are preferred due to their easy separation and recyclability. They are usually based on noble metals (Pt [17,18], Pd [19,20], Au [21], Ru [22], Ir [23]) supported on a variety of materials exhibiting considerably high surface area. It has been observed that the strength of the interaction between the support and the noble metal catalyst produces good conversions; however, there are still issues associated with selectivity. ...

Highly Selective Hydrogenation of Halogenated Nitroarenes over Ru/CN Nanocomposites by in situ Pyrolysis Route
  • Citing Article
  • June 2020

New Journal of Chemistry

... Recently, Lykakis and co-workers Co(III) complex using N,S based ligands and utilized for transfer hydrogenation of nitro-aromatics. In this literature, cobalt-based heterogeneous protocols were established for the transfer hydrogenation of nitro-aromatics to the equivalent amines using N 2 H 4 ⋅H 2 O [26][27][28][29][30][31][32]. A closer appearance at the above-described cobalt complexes were important for the nitro reduction reaction. ...

In Situ Synthesized Silica‐Supported Co@N‐Doped Carbon as Highly Efficient and Reusable Catalysts for Selective Reduction of Halogenated Nitroaromatics