Figure - available from: Catalysis Letters
This content is subject to copyright. Terms and conditions apply.
Hydrogenation performance with H2 pressure (a) and reaction time (b). 0.02 g catalyst with 1.7% of Rh species, 0.07 g BA, 20 mL water, 0.5 MPa H2 (b), RT, 5 h (a)
Source publication
Rh/NaNbO3 catalyst was prepared by a facile solvothermal method combined with photo-deposition technique. Over this catalyst, both conversion and selectivity were up to 100.0% in ten reaction recycles for the selective hydrogenation of benzoic acid to cyclohexane carboxylic acid at room temperature and 0.5 MPa H2 pressure. TOF value of the catalyst...
Similar publications
The demand of nylon-66 has been sharply increased in industry because of its high mechanical strength, high rigidity, excellent stability. The deep hydrogenation of adiponitrile (ADN) to 1, 6-hexanediamine (HDA) is considered as a crucial step to produce nylon-66 in industry. Herein, we report a diffusing strategy to prepare surface Pd-rich PdAg na...
p>Presentation of simulation results on a new metascintillator concept (semi-monolithic) combining state-of-the art timing resolution and depth-of-interaction, with the application of neural networks to provide accurate estimations of energy sharing and energy of interaction.</p
In order to improve the accuracy of pulse laser ranging based on time-of-flight (TOF), this paper proposes a laser ranging method based on double threshold echo pulse prediction correction. By using two high-speed comparators with different thresholds to detect the pulse-echo signal, the initial TOF, pulse width, and edge rate can be obtained. Thes...
Precisely tailoring the oxidation state of single‐atomic metal in heterogeneous catalysis is an efficient way to stabilize the single‐atomic site and promote their activity, but realizing this approach remains to be a grand challenge to date. Herein, we report a class of stable single‐atomic catalysts with well‐tuned oxidation state of Pt by formin...
The conversion of carbon dioxide (CO2) into organic carbonates under ambient temperatures and pressures with high conversion and selectivity still faces a great challenge. The zerovalent atomic catalysts (ACs), featuring accurate structure and valence states, provide a new and accurate model system for catalysis. Herein we developed a general pread...
Citations
... Cyclohexane carboxylic acid (CCA) is an important organic intermediate for therapeutic drugs, such as ansatrienin, praziquantel and caprolactam, 1,2 and its derivatives are important intermediates for organic synthesis in ne chemical industries, such as trans-4-isopropylcyclohexyl acid and cyclohexylmethyl carbamate. For industrial scale synthesis of CCA, selective hydrogenation of benzoic acid (BA) to CCA has attracted growing research attention in the past few years [3][4][5][6][7][8][9][10][11][12] (listed in Table S1 †). At 80°C and 1 MPa H 2 , Qiu et al. 13 realized a CCA selectivity of 100% at a conversion of 89.4% over Ru nanoparticles loaded on N-doped porous two-dimensional carbon nanosheets without hydrogenated intermediates (pathway I as illustrated in Scheme 1). ...
Electrocatalytic hydrogenation of benzoic acid (BA) to cyclohexanecarboxylic acid (CCA) at ambient temperature and pressure has been recognized as a promising alternative to thermal hydrogenation since water is required as the hydrogen source. So far, only a few Pt-based electrocatalysts have been developed in acidic electrolyte. To overcome the limitations of reactant solubility and catalyst corrosion, herein, carbon fiber-supported Ru electrocatalysts with abundant Ru/RuO2 heterojunctions were fabricated via cyclic electrodeposition between −0.8 and 1.1 V vs. Ag/AgCl. In an alkaline environment, a Ru/RuO2 catalyst achieves an excellent ECH reactivity in terms of high BA conversion (100%) and selectivity towards CCA (100%) within 180 min at a current density of 200/3 mA cm⁻², showing exceptional reusability and long-term stability. 1-Cyclohexenecarboxylic acid (CEA) was identified as the reaction intermediate, whose the selectivity is governed by the applied potential. Kinetic studies demonstrate that ECH of BA over Ru/RuO2 follows a Langmuir–Hinshelwood (L–H) mechanism. In situ Raman spectroscopy and theoretical calculations reveal that the Ru/RuO2 interface enhances the adsorption strength of CEA, thereby facilitating the production of fully hydrogenated CCA. This work provides a deep understanding of the ECH pathway of BA in alkaline media, and gives a new methodology to fabricate heterostructure electrocatalysts.
The selective hydrogenation of biomass‐derived benzoic acid (BA) to cyclohexane carboxylic acid (CCA) is vital to producing fine chemicals from renewable sources. Herein, a novel nitrogen‐doped carbon supported bimetallic catalyst (Ni1Co1/NC) was synthesized via a PVP‐assisted method to catalyze the selective hydrogenation of BA to CCA. Compared with the non‐doped Ni1Co1/C and single counterparts, Ni1Co1/NC exhibited a substantially enhanced activity, with 98.1% yield of CCA. The excellent performance was attributed to the NiCo synergistic effect and N‐doped thin carbon layer, which could increase the total proportion of Ni⁰ and Co⁰ species via donating electrons to Co and thus improve the H2 adsorption capacity, the hydrogenation activity of aromatic rings in BA and the stability. This work demonstrates a synergetic effect between NiCo bimetal and N‐doped thin carbon layer. This would pave the way for the rational design and synthesis of high‐performance non‐noble catalysts used in BA hydrogenation.
Selective hydrogenation of benzoic acid (BA) under mild conditions is of great significance for industrial applications. In this study, Ru catalysts supported on P and N-doped mesoporous carbons (PPNC) were...
Niobium is considered to have a good resistance in various chemical environments. However, during the corrosion process, a dense product that forms on the surface was used here as a catalyst for the degradation of the methylene blue dye. The niobium catalyst was formed at room temperature (28°–30 °C) by simple precipitation using immersion of sample in an alkali medium. X-ray diffraction spectroscopy and scanning electron microscopy confirmed the synthesis of Na8Nb6O19.13H2O and its octahedral shape, respectively. Thermogravimetry analysis indicated the thermal stability of the synthesized catalyst. X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and Raman spectroscopic data show the presence of sodium, niobium and oxygen elements in the prepared catalyst. Methylene blue was degraded effectively (90%) and the process obeys the pseudo-first-order kinetics and the degradation was completed in 0.9934 min−1.
The electrocatalytic hydrogenation of aromatic rings in benzoic acid derivatives has arisen as a notionally engaging substitute for thermal catalysis under mild conditions. However, the utilization of organic solvents and...
A novel PtRu/Ni(OH) 2 electrode with a unique coral-shaped architecture was developed for electrocatalytic hydrogenation of benzoic acid into cyclohexanecarboxylic acid, simultaneously showing record conversion, selectivity and faradaic efficiency.
Herein, we present recent advances in the application of metal nanoparticles in the selective hydrogenation of C–C double bonds. The review focuses on reduction methods of alkenes, arenes, and aromatic heterocycles, which were classified according to transition metals used as catalysts. The majority of described systems concern direct hydrogenation, which is of particular importance to industrial processes. Nonetheless, interesting transfer hydrogenation protocols were also developed, which may be incredibly convenient for laboratory purposes. Some of the methods are distinguished with excellent chemoselectivity making them the perfect tool for the synthesis of compounds containing reducible functional groups. Apart from noble metals, the application of earth-abundant ones as catalysts was a subject of studies, and the related methods were highlighted.
Cyclohexanecarboxylic acid (CCA), an important chemical and pharmaceutical intermediate, is commonly produced from thermal catalytic hydrogenation of benzoic acid (BA) under high temperature and pressure. Herein, electrocatalytic hydrogenation (ECH) for highly selective conversion of BA into CCA using carbon fibers with different graphitization degree (carbon fiber paper (CFP), carbon fiber cloth (CFC)) supported commercial platinum carbon (Pt/C) electrode was reported for the first time without using external H2. Our experimental results show that, at room temperature and 1 atm, the BA conversion and the CCA selectivity are both as high as 100% in 0.05 M H2SO4 over carbon fiber paper (CFP)-supported Pt/C (Pt/C/CFP). Meanwhile, Pt/C/CFP electrode still maintains outstanding stability after 10 reaction cycles. In situ Raman results and theoretical calculations reveal that the adsorption strength of BA over Pt/C/carbon fibers electrode varies with the graphitization degree of carbon fibers along with the applied potential. The superior ECH performance of the Pt/C/CFP is mainly attributed to the high dispersity of Pt/C catalysts on CFP as well as unique electronic interaction, which improved the adsorption and activation of BA. Typically, CFP with few defects can induce the accumulation of electrons around the Pt regions and enhance the electron-deficient aromatic adsorption thus improving the ECH performance of Pt/C/CFP, which is the opposite for CFC with more defects.
