INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Wenjie Zhang,Jing Zhao,Linfeng Wang,Guofu Liu,Dekui Shen,Huiyan Zhang
The pyrolytic reforming of toluene to hydrogen and CNTs over the commercial and self-prepared Al 2 O 3 loaded with Fe through the impregnation method is investigated in a fixed bed reactor under the temperature from 600 °C to 800 °C. The physicochemical properties of Fe–Al 2 O 3 catalysts and Al 2 O 3 supports were characterized by XPS, H 2 -TPR, HRTEM and H 2 -pulse chemisorption . The reforming process over the catalyst of Fe loaded on self-prepared Al 2 O 3 gives the excellent H 2 yield of 27.8 mmol/(g-Fe) and graphite yield of 82.6 wt%, which is much higher than those from that over the catalyst of Fe loaded on the commercial Al 2 O 3 . It is evidenced by H 2 -pulse chemisorption that 5.1 % of Fe 0+ dispersion over the commercial Al 2 O 3 with mainly-exposed (110) facet while 11.2 % of Fe 0+ dispersion over self-prepared Al 2 O 3 with mainly-exposed (111) facet were obtained. The adsorption energy of iron cluster (Fe 4 ) with Al 2 O 3 (111) facet was estimated to be −14.5 eV through the DFT simulation, which is notably higher than that of iron cluster (Fe 4 ) with Al 2 O 3 (110) facet as −9.1 eV. With regard to the MD simulation along with XRD analysis of the Fe 3 C crystallite , Fe 0+ particles can be prominently molten at the high Fe 0+ dispersion over Al 2 O 3 facet, promoting the carbon solubility for the assembly of multi-wall CNTs without the deposition of unwanted amorphous carbon .
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2018
·
IF 3.956
Limo He,Song Hu,Long Jiang,Guang Liao,Xiaofang Chen,Hengda Han,Lingfeng Xiao,Qiangqiang Ren,Yi Wang,Sheng Su,Jun Xiang
The effects of catalyst supports (γ-Al 2 O 3 and α-Al 2 O 3 ) on hydrogen yield and carbon nanotubes formation were studied during steam reforming of toluene over Ni-based catalysts. Hydrogen yield and CNTs quality over Ni/γ-Al 2 O 3 were better than those over Ni/α-Al 2 O 3 at S/C ratio of 1 due to the high Ni dispersion of Ni/γ-Al 2 O 3 . With the increasing of steam addition, CNTs production remarkably increased over Ni/α-Al 2 O 3 , while it decreased over Ni/γ-Al 2 O 3 . The CNTs on Ni/γ-Al 2 O 3 were corroded at S/C ratio of 3 by excess steam. Toluene conversion and hydrogen yield over Ni/α-Al 2 O 3 were significantly larger than those over Ni/γ-Al 2 O 3 , which was attributed to the different effects of CNTs on catalytic activity . The strong interaction between Ni particle and γ-Al 2 O 3 led to the base-growth mechanism of CNTs on Ni/γ-Al 2 O 3 in which Ni particles located at the bottom of CNTs, thus the growth of CNTs covered Ni active sites and decreased catalytic activity of Ni/γ-Al 2 O 3 . By contrast, owing to weak interaction, CNTs grown on Ni/α-Al 2 O 3 followed tip-growth mechanism that would increase Ni dispersion and promote reforming reaction .
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
ENERGY & FUELS
·
2015
·
IF 2.79
Yane Zheng,Kongzhai Li,Hua Wang,Xing Zhu,Yonggang Wei,Min Zheng,Yuhao Wang
Chemical-looping reforming of methane (CLRM) offers a potentially effective approach for the coproduction of syngas and pure hydrogen. Macroporous CeO2–ZrO2 solid solutions with different pore sizes were prepared as oxygen carriers for the CLRM system. The physical and chemical properties of the oxygen carriers were characterized by the techniques of scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP), X-ray powder diffraction (XRD), N2 adsorption–desorption, Raman spectra, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR), and temperature-programmed oxidation (TPO). The relationship among the structural features, the concentration of oxygen defect, and the oxygen mobility of the macroporous CeO2–ZrO2 solid solutions and the nonporous sample were also discussed. It is found that the specific surface area and oxygen mobility of such oxides are closed correlated to their performance for the CLRM process. Compared with the nonporous sample, the macroporous CeO2–ZrO2 solid solutions own lower specific surface area and better oxygen mobility due to the relatively high concentration of the oxygen vacancy. This allows such oxides to own both high conversion and selectivity for the oxidation of methane to syngas using a chemical-looping concept. The presence of the macroporous structure also improves the reoxidation rate and hydrogen yield (the hydrogen yield increased by 50%) in the water splitting step. This can be attributed to the abundant channels in the materials, which may improve the dynamic conditions of the gas–solid reactions, resulting in relatively high utilization rate of oxygen carriers. The pore size also affects the activity of the macroporous oxygen carriers. The increase of the pore size slightly reduces the reactivity of the oxygen carrier due to partial collapse of the macroporous structure. The macroporous Ce–Zr-100 oxygen carrier with a pore size of 100 nm exhibits excellent activity and stability in the coproduction of pure hydrogen and high-quality syngas, even after 40 times successive redox cycles.
研究领域:
能源材料学
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催化化学
✓ 已验证
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Muhammad Irfan,Aimin Li,Lei Zhang,Guozhao Ji,Yuan Gao
Catalytic gasification, coupled with in-situ CO 2 capture over Ni-CaO catalyst, is considered to be an effective approach for H 2 -rich and tar-free syngas production. However, the poor stability of Ni-CaO based catalyst raises a question regarding its large scale application. In this study, HfO 2 was used as a stabilizer and promoter for the Ni-CaO catalyst system. The stability of catalyst was evaluated through cyclic carbonation-calcination test with a thermogravimetric analyzer. The results showed that HfO 2 incorporated catalysts performed better stability towards cyclic CO 2 capture. The effect of different HfO 2 additions in catalyst, catalyst to municipal solid waste (C/MSW) ratio, gasification temperature, and moisture content (MC) of MSW was investigated on syngas composition, H 2 yield, dry gas yield (DGY) and product distribution (syngas, tar and char). The results indicated that H 2 yield was improved from 212 mL/g (without catalyst) to 442 mL/g with Ni-CaO (NC) catalyst and further improved with the application of HfO 2 promoted catalysts (Ni-CaO-HfO 2 ). The catalyst with 20% HfO 2 (NCH-20) exhibited maximum H 2 yield of 597 mL/g. Moreover, a significant reduction in tar content from 8.79 wt% (without catalyst), 3.19 wt% (with Ni-CaO) to 2.81 wt% (with NCH-20) was also recorded with HfO 2 promoted catalysts.
研究领域:
化学工程
·
环境科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·
IF 2.93
Shurong Wang,Qinjie Cai,Fan Zhang,Xinbao Li,Li Zhang,Zhongyang Luo
Catalytic reforming of three typical bio-oil model compounds, phenol, acetic acid and hydroxyacetone , has been carried out over a Ni/nano-Al 2 O 3 catalyst. Al 2 O 3 , in the form of nano-rods of length approximately 40 nm, was selected as the catalyst support. The catalyst showed superior performance in terms of activity and stability. The conversions for phenol, acetic acid and hydroxyacetone reached 84.2%, 98.2% and 98.7%, respectively, at the reaction temperature of 700 °C. The corresponding hydrogen yields were 69%, 87% and 97.2%. The catalyst maintained its high reactivity for more than 10 h in the catalytic reforming of three model compounds. The influences of steam to carbon ratio, catalyst loading and Ni content in the catalyst on the reforming performance were also investigated. In addition, the possible decomposition pathways for phenol, acetic acid and hydroxyacetone are proposed.
研究领域:
能源化学
·
催化科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2024
·Vol. 31
·期 4
·1375-1386
·
IF 2.5
Shu Yue,Tao Jianghui,Wang Yanni,Huang Liangzhu,Wang Yabin B.
In comparison with traditional mesoporous materials, dendritic mesoporous silica&titania nanospheres (DMSTNs) with three-dimensional central radial pore channels and multiscale pores have larger pore volume, higher specific surface area, and easier accessible surfaces, making them promising carrier platforms for the applications in catalysis, drug delivery, heavy metals adsorption, etc. In this study, DMSTNs have been manufactured by a one-pot co-condensation method using titanium(diisopropoxide)bis(2,4-pentanedionate) (TDA) as the titanium source. Their morphologies and structures have been finely tuned by TDA content, reaction temperature, stirring rate, solvents, and so forth. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) have been utilized to directly reveal their differences. Two typical kinds of DMSTNs synthesized at different temperatures have been compared, covering N 2 adsorption-desorption isotherms, X-ray photoelectron spectroscopy (XPS), Raman spectrum, ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis-DRS), Fourier Transform Infrared spectroscopy (FT-IR), etc. XPS and Raman results testify that the chemical composition and architecture of these DMSTNs resemble those of titanium silicalite-1 (TS-1) zeolite. The hydrogen yield and the corresponding rate of DMSTNs synthesized at 120 ℃ are 3.56 µmol·g -1 and 0.71 µmol·g -1 ·h -1 , being about 2.99 times higher than those of DMSNs that solely own SiO 2 in the skeleton. Nevertheless, DMSTNs synthesized at 70 ℃ possess a 10.08 µmol·g -1 yield and a 2.04 µmol·g -1 ·h -1 rate, nearly 8.47 times higher than those of DMSNs.
研究领域:
材料科学
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化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Xiang Luo,Yu Hong,Fuchen Wang,Siqi Hao,Chengheng Pang,Edward Lester,Tao Wu
In this study, different types of nano Ni x Mg y O solid solutions for the steam reforming of methanol were prepared via three different preparation methods. The solid solutions were characterised systematically by using a suite of characterisation techniques. TEM analysis demonstrated that Ni particles in these solid solutions were in nano-scale with an average size of 9.6–12 nm. The catalytic performance of these catalysts was evaluated using a fixed-bed reactor operated under atmospheric pressure at four different temperatures, i.e., 400, 500, 600 and 700 °C, and at two steam-to-carbon ratios (S/C), i.e., S/C = 1 and 3. Results showed that the nano Ni x Mg y O material (Ni x Mg y O-hydro), which was prepared using a hydrothermal method, achieved the highest methanol conversion efficiency of 97.4% and hydrogen yield of 58.5% under a S/C ratio of 3. The evaluation on carbon deposition resistance showed that nano Ni x Mg y O-hydro had no detectable carbon deposited under a S/C ratio of 3. In addition, physical and chemical properties of these catalysts were also studied by using H 2 -Temperature-Programmed Reduction/Desorption(H 2 -TPR/D), CO 2 -Temperature- Programmed Desorption(CO 2 -TPD) and X-ray Photoelectron Spectroscopy(XPS). The outstanding carbon deposition resistance of Ni x Mg y O-hydro was attributed to the “isolation effect” of the Ni x Mg y O solid solution structure, which restricts Ni nano particles from aggregation. The high basicity of the surface of Ni x Mg y O-hydro catalyst also resulted in the enhanced adsorption of CO 2 and therefore contributed to anti-carbon deposition by providing oxygen to promote the gasification reaction between carbon and CO 2 .
研究领域:
催化化学
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材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 9
·1-12
·
IF 2.4
Zhong Yuhang,Xu Hui,Li Zhiguo,Zhang Yuqi,Hou Jianyuan,Yuan Yuan,Liu Xingang,Zhang Renxi
This study demonstrates an innovative approach for green and efficient hydrogen production from seawater, utilizing Cu–Fe/Al 2 O 3 catalysts coupled with a dielectric barrier discharge (DBD) system. The catalytic performance was systematically evaluated under varying voltages and Cu/Fe ratios in a DBD reactor to optimize hydrogen production efficiency. Subsequent investigations focused on humidity and gas flow rate effects using the optimal catalyst (Cu/Fe/Al 2 O 3 = 2:1:9). Multimodal characterization (XRD, XPS, FTIR, OES) combined with DFT calculations revealed the mechanistic role of Cu–Fe/Al 2 O 3 in plasma-driven hydrogen generation. The synergistic interaction between Fe and Cu enhanced hydroxyl/hydrogen radical generation through improved adsorption, thereby boosting hydrogen evolution efficiency and yield. The optimized system achieved a maximum hydrogen yield of 7.4 g/kWh at 3 kV operating voltage, 3 L/min argon flow, and 100% relative humidity, establishing an energy-efficient pathway for sustainable hydrogen production from seawater. Graphical
研究领域:
能源科学
·
等离子体化学
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催化
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环境工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Boan Cui,Jiahao Zhao,Yuanyuan Liu,Gangqiang Wu,Jinlong Cui
Si-based hydrolysis hydrogen production is considered a promising green hydrogen generation technology due to its ability to rapidly release hydrogen under ambient temperature and pressure, with non-toxic and pollution-free reaction products. However, the intrinsic chemical inertness of silicon and the rapid formation of a dense SiO 2 passivation layer on its surface in aqueous environments severely hinder its reaction with water, thereby limiting the hydrolysis reaction rate and hydrogen production efficiency. In this work, waste silicon powder was mixed with calcium hydride (CaH 2 ) via ball milling to prepare Si/CaH 2 composite materials. The key factors influencing their hydrolysis performance were investigated by varying the ball milling time and hydrolysis conditions. The Si/CaH 2 @15h sample exhibited a high hydrogen yield of 1049 mL/g and an impressive hydrogen generation efficiency of 91.06 % when hydrolyzed in 0.5 M NaF solution. This composite material also demonstrated excellent hydrogen generation performance in fuel cell testing, achieving effective hydrogen-to-electricity conversion. This study provides a new approach for Si-based hydrolysis hydrogen production and photovoltaic resource recycling, offering a scalable method for fuel cell applications.
研究领域:
材料科学
·
能源化学
·
环境工程
·
可再生能源
·
氢能技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SUPERCRITICAL FLUIDS
·
2018
·
IF 3.122
Chenyu Wang,Wei Zhu,Cheng Chen,Hao Zhang,Naixi Lin,Ying Su
Dewatered sewage sludge with different moisture contents was treated with a nickel catalyst in supercritical water in a batch quartz tube micro-reactor at different temperatures and reaction times. The catalytic activity of the nickel wire catalyst was investigated. Because of the gradual deactivation of the catalyst, the hydrogen yield decreased by 8–72% after five catalytic cycles. The temperature has the largest influence on the deactivation rate of the nickel catalyst. The decline rate of the hydrogen yield decreased from 67% to 8% when the temperature was increased from 400 °C to 500 °C. SEM, EDS and TPO were used to characterize the spent catalyst. The results showed that the deactivation of the nickel catalyst is caused by the deposition of char/coke on the catalyst surface. Finally, the relationship between the reaction conditions and catalyst deactivation was investigated from the viewpoint of the organic matter degradation pathway.
研究领域:
环境工程
·
化学工程
·
催化
·
废物管理
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xiangge Wang,Xiaoxiao Lu,Wen-Jie Chen,Chunmei Xiao,Miaoling Huang,Xiaoyang Pan,Bo Weng,Shijing Liang
In recent years, piezo-catalytic hydrogen production has been widely investigated for potential applications. Despite various strategies having been utilized to enhance the performance of piezocatalysts, there is a scant report on improving catalytic activity through the modulation of carrier migration pathways. Herein, we have successfully synthesized BiOCl with exposed {001} and {010} facets through facet engineering. The built-in electric field within the BiOCl crystals is oriented perpendicular to the {001} facets and parallel to the {010} facets, leading to differing charge carrier transfer pathways in the two samples. Specifically, in the BiOCl-010 sample, due to the electric field parallel to the nanosheet plane, charge carriers migrate along the x-axis. In contrast, in the BiOCl-001 sample, the electric field is perpendicular to the nanosheet plane, causing charge carriers to transfer along the z-axis, resulting in a shorter charge carrier migration distance. Consequently, BiOCl-001 demonstrates superior piezo-catalytic performance compared to BiOCl-010 toward H2 production and dye degradation. Both samples exhibit identical morphologies and similar energy band structures. Therefore, the enhanced performance is attributed to its shorter charge transport distance as well as the relatively higher piezoelectric coefficient associated with the {001} facets of BiOCl, which facilitates effective carrier separation.
研究领域:
材料科学
·
催化
·
纳米技术
·
环境科学
·
能量转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 236
·期 10
·1-13
·
IF 3
Li Yuan,Fan Jun,Huang Bingyao,Li Hongyan,Zhao Jie,Li Kai,Wang Fei
Removal of PH 3 from industrial gases have attracted extensive attention due to its high toxicity and catalyst poisoning characteristics. In this study, a series of copper-based support-free catalysts were synthesized by a facile method using different nitrogen and carbon sources. The 100% removal of PH 3 could reach 540 min in micro-oxygen environment by using the obtained catalyst. The X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS) results exhibited that the formation of Cu 3 P was contributed to the deactivation of the catalysts, which was considered as active component for the decomposition of PH 3 . The PH 3 decomposition performance could achieve 99% under 450 ℃ with 90% yield of H 2 using the exhausted catalysts. This strategy is beneficial for the development of dephosphorization catalyst and provides a new route for the secondary use of exhausted catalysts. Graphical A facile strategy was employed for synthesize support-free catalysts for PH3 oxidation by using Cu(NO3)2 and different nitrogen resources or carbon resource. The performance were thoroughly compared. The exhausted catalyst was conducted in the PH3 catalytic dissociation reaction, where the conversion rate of PH3 could reach 99% with 90% hydrogen production under 450 ℃.
研究领域:
环境催化
·
材料科学
·
工业气体净化
·
化学工程
✓ 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）