RSC Advances
·
2016
·Vol. 6
·期 56
·51221-51228
·
IF 3.289
Yanliang Yang,Jiping Ma,Xiuquan Jia,Zhongtian Du,Ying Duan,Jie Xu
Al2O3 modified by alkaline earth metals M–Al2O3 (M = Mg, Ca, Sr, Ba) was synthesised by coprecipitation method. The nickel-based catalysts supported by M–Al2O3 were prepared by impregnation method. The catalysts were characterized by TEM, N2 adsorption/desorption, XRD, H2-TPR, NH3-TPD and XPS, and used for the direct hydrogenation of furfural to tetrahydrofurfuryl alcohol (THFA) in water. The reaction was demonstrated to proceed through furfuryl alcohol as an intermediate. The modification of Al2O3 by alkaline earth metals has a significant effect on the activity and selectivity of THFA. A high yield of THFA was obtained over Ni/Ba–Al2O3 under optimized conditions. Moreover, the catalyst is recyclable and reusable at least four times without significant loss of the conversion of furfural and selectivity of THFA.
研究领域:
催化化学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2024
·
IF 7.2
Luqman Abdullahi Sani,Haolong Bai,Zifu Xu,Liangliang Fu,Yining Sun,Xiaorui Huang,He Gao,Xuejing Liu,Dingrong Bai,Zhanguo Zhang,Fabing Su,Jiao Liu,Guangwen Xu
Ni/Al 2 O 3 catalysts (noted as Ni/Al-350, Ni/Al-500, and Ni/Al-700, respectively) were synthesized by a facile solution combustion method but at different combustion temperatures (350 °C, 500 °C, and 700 °C, respectively). For comparison, Ni/Al 2 O 3 (noted as Ni/Al-100) was also prepared by the impregnation method and applied in the methanation reaction. The Ni/Al 2 O 3 synthesized at the combustion temperature of 350 °C showed better performance than the others at higher combustion temperatures, and the activity for CO 2 methanation followed an order of Ni/Al-350 > Ni/Al-500 > Ni/Al-700 > Ni/Al-100. The increase in the combustion temperature decreased active sites for the H 2 and CO 2 adsorption, which could be associated with the reduced Ni dispersion and basic sites, thus lowering its activity and increasing its carbon deposition rate.
研究领域:
催化化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Han-Bing Gao,Le-Le Qiu,Fa-Peng Wu,Jian Xiao,Yun-Peng Zhao,Jing Liang,Yong-Hui Bai,Fang-Jing Liu,Jing-Pei Cao
Catalytic hydrogenolysis of C O bonds in lignin provides a promising route to produce high value-added biofuels and chemicals. However, designing highly active and stable catalysts for this process is still a challenge. Herein, a series of Ni/Al 2 O 3 catalysts were synthesized by calcination and reduction of layered double hydroxide precursors, and their activities were evaluated in the catalytic conversion of lignin-derived compounds. Diphenyl ether was completely converted with a 100% monomeric selectivity (cyclohexane and cyclohexanol) over the optimized Ni/Al 2 O 3 -500 under the optimal conditions of 200 ℃, 0.5 MPa H 2 and 1.5 h, indicating the excellent catalytic activity in the cleavage of C O bonds of the catalyst. The excellent catalytic performances of Ni/Al 2 O 3 -500 were originated from its relatively large specific surface area, well-developed porosity, small crystallite size, high Ni 0 concentration and strong interaction between the active metal and support. The reusability experiments show that Ni/Al 2 O 3 -500 possesses a relatively high stability for six reuses. Moreover, various lignin model compounds can be completely converted to corresponding monomeric products over Ni/Al 2 O 3 -500, indicating the applicability of this ingenious catalyst. The application of the hydrotalcite-derived Ni-based catalysts with high activity and stability provides a promising approach for the efficient hydrogenolysis of lignin derivatives.
研究领域:
催化化学
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生物质转化
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·
IF 3.205
Zhiming Gao,Lin Cui,Hongwei Ma
Four methods were adopted to prepare samples 20%NiO/Al 2 O 3 with calcination fixed at 500 °C, which were then reduced into 20%Ni/Al 2 O 3 and used as catalysts for reaction of selective methanation of CO in H 2 -rich gas (CO-SMET). XRD and TPR measurements indicate that nickel aluminates were formed in the calcined samples and their formation was influenced by preparation methods. Higher temperatures were required to reduce the calcined samples more efficiently and to achieve a higher catalytic activity for CO-SMET. Among the four methods, the precipitation method using ammonium carbonate as precipitant produced the highest catalytic activity both for CO methanation and for CO 2 methanation after reduction at 800 °C for 2 h. The calcined sample 20%NiO/Al 2 O 3 prepared with the method was therefore used as support and impregnated with Ru 3+ solution. Ru addition promoted reduction of Ni 2+ ions in the calcined sample even at the low temperatures of 400 °C and 500 °C. The catalyst 1%Ru–20%Ni/Al 2 O 3 reduced at 500 °C thus had a superior performance, removing CO to ca. 30 ppm with a selectivity as high as 75% at reaction temperature of 220 °C.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Cheng Wang,Fengsheng Zhan,Shan Wang,Yi Wei,Jianbing Ji
Methane pyrolysis is a promising sustainable technology for CO 2 -free hydrogen production. However, the development of stable methods for methane pyrolysis to produce hydrogen at lower temperatures has presented significant challenges. This study presents a reaction system that combines molten carbonate with Ni/Al 2 O 3 catalyst and investigates methane pyrolysis using this system in a bubble-cap reactor. Remarkably, this system exhibited a low activation energy of 145.8 kJ per mole, enabling the achievement of a methane conversion of 92.5 % at 580 °C by employing a double-layer bubble cap tray configuration. Furthermore, the system showcases sustained activity for a duration of up to 72 h.
研究领域:
化学工程
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2025
·
IF 9.4
Da Cui,Peng Zhang,Shuang Wu,Hon Man Luk,Yixi Wu,Bin Liu,Shuo Pan,Jingru Bai,Qing Wang,Xuehua Zhang
Oil shale has garnered significant attention as a supplementary energy source to traditional fossil fuels. In this study, we investigated the catalytic hydrothermal liquefaction (HTL) of shale oil sludge using three catalysts (Fe, Na 2 CO 3 , Ni/Al 2 O 3 ) and three combinations in pairs. The hydrothermal oil (HTO) yield, energy recovery (ER), and conversion rate (CR) of organic matters were comprehensively analyzed under six catalyst conditions. Both Fe + Na 2 CO 3 and Fe + Ni/Al 2 O 3 paired catalyst combinations achieved similar HTO yields of 28.43 % and 28.13 % along with ER values of 56.19 % and 57.94 % respectively. Moreover, these two groups achieved remarkably high CR values of 81.88 % and 81.02 %, respectively. The HTO from the Fe + Ni/Al 2 O 3 combination has the highest H/C ratio and the lowest O/C ratio at 1.682 and 0.032, respectively. Elemental composition, Fourier transform infrared spectroscopy (FT-IR), and gas chromatography-mass spectrometry (GC-MS) analyses of HTO were conducted in this study. The HTO produced by using Fe + Ni/Al 2 O 3 exhibited the most ideal distillation distribution, with fractions below diesel accounting for up to 96.94 %. Based on the catalytic functions of Fe, Ni, and Al 2 O 3 , six potential synergistic mechanisms of Fe + Ni/Al 2 O 3 were summarized. These mechanisms highlighted Fe + Ni/Al 2 O 3 's roles in promoting compound conversion pathways in HTO, ultimately revealing the synergistic catalytic mechanism.
研究领域:
能源化学
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2024
·
IF 5.6
Bowen Luo,Xiaoxin Chen,Yongxiang Guo,Riyang Shu,Chao Wang,Jianping Liu,Junyao Wang,Zhipeng Tian,Ying Chen
Hydrodeoxygenation (HDO) is a crucial technique for upgrading biomass-derived compounds, playing a significant role in the advancement of sustainable energy technologies. Under harsh reaction conditions, conventional HDO catalysts often suffer from reduced efficiency due to particle aggregation. This study presents a highly efficient Ni/Al 2 O 3 -C catalyst that mitigates this issue by stabilizing Ni metal particles and enhancing metal-support interactions. Characterization of the catalyst was carried out using XRD, TEM, and CO-TPD, which revealed that the incorporation of Al species improved metal dispersion and reduced the size of the Ni particles. Guaiacol, a phenolic compound derived from lignin, was chosen to evaluate the HDO performance under mild conditions. The optimized Ni/3Al 2 O 3 -5C catalyst achieved a guaiacol conversion of 99.9 % with a cyclohexane selectivity of 99.8 % at 210 °C. The outstanding performance is attributed to the high hydrogenation capacity of the small Ni particles and the acid sites on the carbon surface. Metal-support interactions stabilize the Ni particles, preventing leaching and deactivation. The catalyst has also exhibited comparable effectiveness in the HDO of both lignin-derived compounds and lignin-oils, confirming its adaptability across various substrates. The study demonstrates that Al 2 O 3 -C plays a crucial role in enhancing both the structural stability and catalytic efficiency of HDO catalysts, offering a promising approach for upgrading biomass-derived compounds.
研究领域:
催化化学
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生物质能
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可再生能源
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Shan Jiang,Qian Zhang,Xizi Lin,Wenjun Liu,Songbai Qiu,Riyang Shu
Hydrodeoxygenation (HDO) is an effective method for upgrading lignin-derived phenolic compounds into high-quality liquid fuels, and the support rational design of HDO catalysts is critical for boosting reaction efficiency. In this study, a series of Ni/Al 2 O 3 -C catalysts with different ratio of Al 2 O 3 and carbon components were proposed for the HDO of lignin-derived phenolic compounds. Ni/Al 2 O 3 -C-0.25 catalyst is screened for a superior HDO efficacy compared to the other catalysts, in which guaiacol can be completely converted at 220 °C, with 99.9 % cyclohexane selectivity produced at 4 h. Various characterizations for the catalysts were carried out, including BET, XRD, TEM, XPS and NH 3 -TPD. According to the characterization results, Ni/Al 2 O 3 -C-0.25 catalyst presents little dense Al 2 O 3 fiber structure, which favors the Ni metal dispersion and possesses the smallest Ni metal particle size (10.9 nm). This leads to the outstanding catalytic hydrogenation activity. Moreover, the specific interaction between Al 2 O 3 and carbon in Ni/Al 2 O 3 -C-0.25 catalyst results in the moderate acid property, which promotes the deoxygenation process of the intermediate products, as evidenced by the effective cleavage of C-O bond and the enhanced selectivity of cyclohexane products. The adaptation of Ni/Al 2 O 3 -C-0.25 catalyst to lignin-oil upgrade was also investigated, with a rise of hydrocarbon content from 6.1% to 47.5%. These results indicate that the catalysts with this composite support had the potential to upgrade lignin-derived phenolic compounds to superior grade hydrocarbon liquid fuels.
研究领域:
化学工程
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催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 10
·6764-6773
·
IF 3.5
Huihui Yan,Kun Wang,Liping Zhao,Peng Zhang,Han Chen,Jing Liu,Lian Gao
A new type of Ni/Al 2 O 3 self-supporting catalysts, with high specific surface area, was fabricated by blow-spinning technology. These Ni/Al 2 O 3 self-supporting catalysts are hollow flexible fibers and were utilized for the dry reforming of methane. The Ni/Al 2 O 3 catalysts exhibited exceptional catalytic performance, maintaining their activity for over 150-h at a high temperature of 800°C. The Ni nanoparticles disputed on the hollow fibers demonstrated remarkable resistance to sintering and coking during high-temperature catalysis. This was a noteworthy feature, as sintering and coking are common challenges faced by catalysts during high-temperature reactions. Furthermore, the catalysts retained its activity even after a rigorous 150-h test at 800°C, indicating its durability and stability. Importantly, the Ni/Al 2 O 3 self-supporting could be successfully reactivated after the test, further highlighting its reusable nature. This study offers promising new avenues for the development of high-temperature, self-supporting, and reactivatable catalysts.
研究领域:
材料科学
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催化化学
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能源转化
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Hongcai Su,Ekkachai Kanchanatip,Defeng Wang,Haidan Zhang,Antoni,Ishrat Mubeen,Zhicheng Huang,Mi Yan
Ni/Al 2 O 3 catalyst is the one of promising catalysts for enhancing H 2 production from supercritical water gasification (SCWG) of biomass. However, due to carbon deposition , the deactivation of Ni/Al 2 O 3 catalyst is still a serious issue. In this work, the effects of lanthanum (La) as promoter on the properties and catalytic performance of Ni/Al 2 O 3 in SCWG of food waste were investigated. La promoted Ni/Al 2 O 3 catalysts with different La loading content (3–15 wt%) were prepared via impregnation method. The catalysts were characterized using XRD , SEM, BET techniques. The SCWG experiments were carried out in a Hastelloy batch reactor in the operating temperature range of 420–480 °C, and evaluated based on H 2 production. The stability of the catalysts was assessed by the amount of carbon deposition on catalyst surface and their catalytic activity after reuse cycles. The results showed that 9 wt% La promoter is the optimal loading as Ni/9La–Al 2 O 3 catalyst performed best performance with the highest H 2 yield of 8.03 mol/kg, and H 2 mole fraction of 42.46% at 480 °C. La promoted Ni/Al 2 O 3 catalysts have better anti-carbon deposition properties than bare Ni/Al 2 O 3 catalyst, resulting in better gasification efficiency after reuse cycles. Ni/9La–Al 2 O 3 catalyst showed high catalytic activity in SCWG of food waste and had good stability as it was still active for enhancing H 2 production when used in SCWG for the third time, which indicated that La promoted Ni/Al 2 O 3 catalysts are potential additive to improve the SCWG of food waste.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2013
·
IF 3.548
Ying Wang,Jun Peng,Chen Zhou,Zi-Yian Lim,Chunzheng Wu,Shuang Ye,Wei Guo Wang
Ni/ x Pr-Al 2 O 3 ( x = 5, 10, 15, 20 wt%) catalysts with an application in autothermal reforming of methane were prepared by sequential impregnation synthesis; its catalytic performance was evaluated and compared with that of Ni/γ-Al 2 O 3 catalyst; the physicochemical properties of the catalysts were characterized by X-ray diffraction (XRD), Transmission electron microscope (TEM), X-Ray Photoelectron Spectrometer (XPS), Thermo Gravimetric Analyzer (TGA) and H 2 -temperature programmed reduction techniques (TPR). The results showed that Pr addition promoted the reduction of nickel particle size on the surface. TPR experiments suggested a heterogeneous distribution of nickel oxide particles over x Pr-Al 2 O 3 supports and the promotion of NiO reduction by Pr modification. The CH 4 conversion increased with elevating levels of Pr addition from 5% to 10%, then decreased with Pr content from 10% to 20%. For the stability catalytic tests, Ni/ x Pr-Al 2 O 3 catalysts maintained the high activity after 48 h while Ni/Al 2 O 3 had a significant deactivation.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 9
·2282-2290
·
IF 5.726
Dawei Zhou,Peixue Wang,Yan Long,Yuqing Fei,Youquan Deng
The thermal cracking behavior of diethyl hexamethylenedicarbamate (EHDC) was investigated in this work. The polymers formed under different conditions were analyzed by IR and TG, indicating that the polymers were mixtures of EHDC, polyureas, imines and others. The polymers could be converted to EHDC by a simple alcoholysis reaction for the first time over Fe–Ni/Al2O3 catalysts. Under the optimized reaction conditions, the yield of EHDC could reach up to 52% with 99% selectivity over 8% Fe–3% Ni/Al2O3 catalysts. The catalysts were extensively characterized by BET, XPS, XRD, SEM, TEM, H2-TPR and NH3-TPD, showing that the interaction effect between Fe species and Ni species may be attributed to high catalytic performance of the catalyst. Meanwhile, the loss of active components resulted in decreased catalytic activity.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）