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Preparation of Ni/bentonite catalyst and its applications in the catalytic hydrogenation of nitrobenzene to aniline

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Chinese Journal of Chemical Engineering 2016年第9期24卷 1195-1200页

作者： Yuexiu jiang Xiliang Li Zuzeng Qin hongbing ji Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology School of Chemistry and Chemical Engineering Guangxi University School of Chemistry and Chemical Engineering Sun Yat-sen University

Ni supported on bentonite was prepared by the impregnation method with different nickel contents, applied to the hydrogenation of nitrobenzene to aniline in a fixed-bed reactor, and it was characterized by X-ray diffraction（XRD）, H2-temperature programmed reduction（H2-TPR）, and X-ray photoelectron spectrometry（XPS）. The results showed that Ni/bentonite catalyst with 20 wt% nickel content provided a higher conversion of nitrobenzene and selectivity of aniline compared to other catalysts. NiO was the precursor of the active component of the catalyst, and the small crystallite size as well as the highly dispersed NiO on the Ni/bentonite-20 catalyst, contributed to the catalytic performance. The hydrogenation of nitrobenzene was carried out at 300℃ with a H_2 gaseous hourly space velocity of 4800 ml·（g cat）^-1·h^-1and a nitrobenzene liquid hourly space velocity of4.8 ml·（g cat）^-1·h^-1 over Ni/bentonite-20. A 95.7% nitrobenzene conversion and 98.8% aniline selectivity were obtained. While the nitrobenzene liquid hourly space velocity was 4.8 ml·（g cat）^-1·h^-1, the yield of aniline was more than 95.0% during a 10-hour reaction.

关键词： Ni/bentonite catalyst Catalysis Support Hydrogenation Nitrobenzene

Deep oxidation in propane oxidative dehydrogenation to propene over V_2O_5/γ-Al_2O_3 studied by in-situ DRIFTS

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Journal of Natural Gas Chemistry 2009年第3期18卷 359-364页

作者： Yunbing He hongbing ji jianhua Xu Lefu Wang School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 Guangdong China

In-situ DRIFTS was used to study the deep oxidation of propane, a side reaction during propane oxidative dehydrogenation to propene. Strong adsorption of propene was supposed to be the main reason for the deep oxidation. It was found that gaseous oxygen in the feed and the reaction temperature had great influence on the reaction. To obtain a relative high selectivity to propene, the reaction temperature should be maintained at 150-250℃ with a proper content of gaseous oxygen in the feed for a certain catalyst and some modifiers which could weaken the adsorption of propene on the catalyst surface would be favorable.

关键词： propane propene oxidative dehydrogenation in-situ DRIFTS deep oxidation

Experimental simulation of capillary effect on rough flat surfaces

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Particuology 2022年第1期20卷 115-123页

作者： Ziwen Zuo Junfeng Wang Yuanping Huo Dongbao Wang hongbing ji Institute for Energy Research Jiangsu UniversityZhenjiang 212013China School of Energy and Power Engineering Jiangsu University.Zhenjiang 212013China Fine Chemical Industry Research Institute School of ChemistrySun Yat-sen UniversityGuangzhou 510275China

The movement of the liquid column inside the slit was utilized to experimentally simulate the characteristics of the capillary force per unit length for different rough flat *** movement of the liquid column was achieved by continuously changing the slit *** maximum climb height and contact angle of the liquid column were observed during this process to study the relationship between capillary force and contact surface *** on the assumption that the microstructures on the rough surfaces are of the same form and continuously and uniformly distributed,it is shown that the capillary force per unit length under homogeneous wetting is independent of the *** heterogeneous wetting,the capillary force per unit length is positively correlated with the *** results also indicate that the appearance of"contact line pinning"is caused by insufficient capillary force along the direction of liquid column movement.

关键词： Contact angle Contact line Capillary force Rough surfaces

Cumene Liquid Oxidation to Cumene Hydroperoxide over CuO Nanoparticle with Molecular Oxygen under Mild Condition

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Journal of Natural Gas Chemistry 2007年第4期16卷 393-398页

作者： Meiying Zhang Lefu Wang hongbing ji Bing Wu Xiaoping Zeng Analytical and Testing Center South China University of Technology Guangzhou 510650 Guangdong China School of Chemical and Energy Engineering South China University of Technology Guangzhou 510650 Guangdong China

CuO nanoparticle was synthesized via wet chemical method and was characterized diffraction （XRD）, nitrogen adsorption-desorption, and scanning electron microscopy （SEM） by X-ray Catalytic oxidation of cumene with molecular oxygen was studied over CuO nanoparticle. The catalysts showed markedly higher activities as compared to CuO prepared by conventional method, CuO/Al2O3, or homogeneous copper catalyst under comparable reaction conditions. The cumene conversion, cumene hydroperoxide （CHP） yield, and selectivity using 0.25 g CuO nanoparticle catalyst and 0.1 mol cumene at 358 K for 7 h were 44.2%, 41.2% and 93.2%, respectively. The catalyst can be recycled. After 6 recycled experiments, no loss of catalytic activity was observed.

关键词： nanoparticle CuO cumene liquid oxidation

Tannic Acid as a Polyphenol Material-Assisted Synthesis of Cyclic Carbonates Using CO2 as a Feedstock： Kinetic Characteristic and Mechanism Studies

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Chinese Journal of Chemistry 2017年第5期35卷 659-664页

作者： Rongchang Luo Wuying Zhang Xiantai Zhou hongbing ji School of Chemistry Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province Sun Yat-sen University Guangzhou Guangdong 510275 China

Tannic acid （TA）/KI as a cheap,green,highly-efficient,biocompatible,and recyclable catalytic system represents the excellent synergistic effect in the cycloaddition reactions of CO2 and epoxides under solvent-free conditions,which is originated from hydrogen bonding between the hydrogen atoms of phenolic hydroxyl groups within TA and the oxygen atom of the ***,it is considerable to be a sustainable methodology for the utilization of bio-resources.

关键词： carbon dioxide cyclic carbonate tannic acid kinetic study cooperative effect

Ni/bentonite catalysts prepared by solution combustion method for CO_2 methanation

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Chinese Journal of Chemical Engineering 2018年第11期26卷 2361-2367页

作者： Yuexiu jiang Tongxia Huang Lihui Dong Zuzeng Qin hongbing ji School of Chemistry and Chemical Engineering Guangxi Key Laboratory of Electrochemical Energy MaterialsGuangxi University School of Chemistry Sun Yat-sen University

A 20 wt% Ni/bentonite catalyst was prepared by a solution combustion synthesis (SCS), which exhibited higher activity for the CO_2methanation than that of an impregnation method (IPM), and the catalyst prepared by SCS showed a CO_2 conversion of 85% and a CH4selectivity of 100% at 300 °C, atmospheric pressure, and 3600 ml·(g cat)-1·h-1, and the catalyst exhibited stable within a 110-h reaction. The results showed higher me- tallic Ni dispersion, smaller Ni particle size, larger specific surface area and lower reduction temperature in the Ni/ bentonite prepared by SCS than that of IPM. And the Ni/bentonite prepared by the SCS moderated the interaction between NiO and bentonite.

关键词： CO2 methanation Ni/bentonite catalyst Solution combustion synthesis Impregnation method

Recyclable bifunctional aluminum salen catalyst for CO2 fixation:the efficient formation of five-membered heterocyclic compounds

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Science China Chemistry 2017年第7期60卷 979-989页

作者： Rongchang Luo Zhi Yang Wuying Zhang Xiantai Zhou hongbing ji Key Laboratory of Low-Carbon Chemistry&Energy Conservation of Guangdong Province School of ChemistrySun Yat-sen UniversityGuangzhou 510275China

A variety of unique Al(salen) complexes functionalized by imidazolium-based ionic liquid(IL) moieties with the salen ligand at the two sides of 3,3′-position have been successfully prepared, rather than familiar 5,5′-position reported *** catalytic activity obtained by these bifunctional catalysts could be superior to those of the binary type catalysts in the formation of five-membered heterocyclic compounds from the cycloaddition reaction of CO_2 and three-membered heterocyclic compounds(including terminal epoxides and N-substituted aziridines), presumably due to the distinguished intramolecularly synergistic catalysis, which might lead to perform the cycloaddition reaction at ambient conditions and retain excellent yield and unprecedented chemo-or regioselectivity. Moreover, the polyether-based trifunctional Al(salen) catalysts with the best catalytic performance could be regenerated and reused at least eight times without any obvious decreases in catalytic activity. Finally,the kinetic investigation suggested the structure of catalysts had important influences on the catalytic activity, thereby proposing the possible reaction mechanism.

关键词： carbon dioxide cyclic carbonate salen aluminum bifunctional catalyst cooperative effect

Influence of Zr, Ce, and La on Co_3O_4 catalyst for CO_2 methanation at low temperature

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Chinese Journal of Chemical Engineering 2018年第4期26卷 768-774页

作者： Yuwen Zhou Yuexiu jiang Zuzeng Qin Qinruo Xie hongbing ji School of Chemistry and Chemical Engineering Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology Guangxi University School of Chemistry Sun Yat-sen University School of Biology and Chemical Engineering Guangxi University of Science and Technology

The Co3O4 and Zr-,Ce-,and La-Co3O4 catalysts were prepared,characterized,and applied to produce CH4 from CO2 catalytic hydrogenation in low temperature as 140–220℃.The results indicated that the addition of Zr,Ce,or La to the Co3O4 decreased the crystallite sizes of Co and the outer-shell electron density of Co^3＋,and increased the specific surface area,which would provide more active sites for the CO2 ***,the addition of Zr also changed the reducing state of Co3O4 via an obvious change in the interaction between Co3O4 and ***,Zr doped into the Co3O4 increased the basic intensity of the weak and medium basic sites,as well as the amount of Lewis acid sites,and Bronsted acid sites were also found on the Zr-Co3O4 *** introduction of Zr,Ce,or La favored the production of CH4,and the Zr-Co3O4catalyst exhibited the highest CO2 conversion（58.2%）and CH4 selectivity（100%）at 200℃,and 0.5 MPa with a gaseous hourly space velocity of 18,000 ml·g^-1（cat）·h^-1,and the catalytic activity of CO2methanation for the Zr-,Ce-,and La-Co3O4 exhibited more stable than Co3O4 in a 20-h reaction.

关键词： CO2 hydrogenation Methanation Co3O4 catalyst Cobalt-zirconium interaction Basic sites

Palladium nanoclusters entrapped in polyurea:A recyclable and efficient catalyst for reduction of nitro-benzenes and hydrodechlorination of halogeno-benzenes

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Science China Chemistry 2010年第7期53卷 1520-1524页

作者： ji hongbing LONG QingPing HE YunBing YAO XingDong The Key Laboratory of Low-carbon Chemistry&Energy Conservation of Guangdong Province School of Chemistry and Chemical EngineeringSun Yat-sen UniversityGuangzhou 510275China College of Chemistry&Ecological Engineering Guangxi University for NationalitiesNanning 530006China

Polyurea-entrapped palladium nanoclusters have been prepared by interfacial polymerization in W/O emulsion and showed high thermal stability and chemical stability with the content of 0.12 mmol g-1 *** catalyst exhibited dual catalytic activity for reduction of nitro compounds and hydrodehalogenation of aromatic chlorides in atmospheric hydrogen with 100% yield for reduction of nitro compounds and >99% yield for hydrodehalogenation of aromatic *** immobilizing method was particularly effective and eliminated the need of special chelating groups.

关键词： polyurea-entrapped palladium nanocluster interfacial polymerization reduction hydrodehalogenation immobilization