INDUSTRIAL CROPS AND PRODUCTS
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2019
·
IF 4.191
Gaofeng Chen,Tingzhou Lei,Zhiwei Wang,Shijie Liu,Xiaofeng He,Qian Guan,Xiaofei Xin,Haiyan Xu
A mesoporous composite CoCuK/ZrO 2 -SiO 2 catalyst with high activity and long life was prepared by vacuum impregnation and multisolvent self-assembly. The catalytic activity of the mesoporous catalyst was investigated for the synthesis of ethanol and higher alcohols from biomass syngas from wheat straw. The catalyst was characterized by small-angle X-ray diffraction, power XRD, N 2 adsorption and desorption experiments (BET), and transmission electron microscopy (TEM). The effects on the reaction activity and products from the addition of alkali metal promoter K, the modification of ZrO 2 and different copper/cobalt compositions were analyzed. The life of the catalyst was determined using a pressurized fixed-bed reactor. The results show that the catalyst possesses the high CO hydrogenation activity, high C 2+ OH selectivity and high life expectancy needed to meet industrial applications.
研究领域:
催化化学
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可再生能源
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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
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2019
·
IF 4.084
Yang Liu,Haimiao Yu,Jiecheng Liu,Dezhen Chen
In this study, innovative Ni-based catalysts supported by five typical slag carriers (magnesium slag (MS), steel slag (SS), blast furnace slag (BFS), pyrite cinder (PyC) and calcium silicate slag (CSS)) were prepared by wet impregnation. With the prepared catalysts and Ni/γ-Al 2 O 3 catalyst, catalytic reforming of pyrolysis volatiles from pine sawdust for syngas production and tar removal was investigated. The catalysts were characterized by BET, XRD , SEM, TEM and Raman. The catalytic performances of the six catalysts were decreasing in the following order: Ni/MS > Ni/γ-Al 2 O 3 > Ni/SS > Ni/BFS > Ni/CSS > Ni/PyC. Ni/MS catalyst exhibited excellent catalytic reactivity as well as thermal stability in terms of tar conversion (95.19%), gas yield (1.46 Nm 3 /kg) and CO 2 capture ability (CO 2 yield of 0.5%). Both amorphous carbon and graphite-type carbon were formed on the catalysts after catalytic reforming and the D/G ratio (the relative intensity ratio of the D-band to the G-band) was positively correlated to the catalytic activity .
研究领域:
催化
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化学工程
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2015
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IF 2.711
Lianfang Wang,Ang Cao,Guilong Liu,Lihong Zhang,Yuan Liu
Higher alcohols synthesis (HAS) is a strong exothermal reaction which leads to the formation of hotspots on the catalysts and the hotspots result in poor selectivity, and Cu–Co based catalysts are one of the most promising to which the formation of Cu–Co alloy is critical. Therefore a new scheme was proposed, based on the excellent thermal conductivity of carbon fibers (CFs) and the uniform mixing of metal ions in layered double hydroxides (LDHs), the latter favors the formation of metallic alloy. Nanocomposites of LDHs and CFs were prepared by using co-precipitation method and used for HAS, and characterized by using FTIR, N 2 adsorption–desorption, XRD, TPR, SEM and TEM techniques. In the composites, nanosheets with the typical LDHs morphology are perpendicularly grown on the surface of CFs while intersecting each other, creating a highly open and porous structure. After reduction, Cu–Co-alloy nanoparticles are formed from the LDHs. The resultant catalysts showed high activity and much high selectivity to higher alcohols. The reported methods can be expanded to prepare other LDHs/CFs composites.
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
APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
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IF 11.698
Fen Wang,Wei-Zhen Li,Jing-Dong Lin,Zhi-Qiang Chen,Yong Wang
Catalyst durability is one of the major problems hindering the commercialization of partial oxidation of methane (POM) for syngas production. We report that a Pt/MgAl 2 O 4 -HS catalyst with the MgAl 2 O 4 -HS support being synthesized via hydrolysis solvothermal (HS) method demonstrates high stability for POM during a 500 h life testing at 900 °C without detectable coke formation, while a Pt/MgAl 2 O 4 -CP counterpart in which MgAl 2 O 4 was prepared by an optimized co-precipitation (CP) method exhibits continuous deactivation accompanied by coking. Using a suite of characterizations incluidng BET, H 2 chemisorption, XRD, STEM, TEM, TG/DTA and TPD of NH 3 and CO 2 , we reveal that the high catalytic durability of the Pt/MgAl 2 O 4 -HS is due to the spinel surface of MgAl 2 O 4 -HS that can efficiently stabilize Pt against sintering. The Pt/MgAl 2 O 4 -CP, however, has defect Al 2 O 3 or MgO-like species on the MgAl 2 O 4 -CP surface, inhibiting its capability to stabilize Pt. We confirm that the POM reaction undergoes a combustion-reforming pathway by monitoring the temperatures and gaseous product compositions along the catalyst bed. These results provide guidance for rational design of a longevity catalyst for POM process.
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 MATERIALS SCIENCE
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2016
·Vol. 51
·期 11
·5216-5231
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IF 2.302
Cao Ang,Liu Guilong,Wang Lianfang,Liu Jingge,Yue Yizhi,Zhang Lihong,Liu Yuan
Abstract Nanostructured CuCo-LDH/CNT composites were successfully synthesized according to the co-precipitation method and firstly used for higher alcohol synthesis. The structural characterization and morphological observation demonstrated that CuCo-LDHs were in situ grown on the CNTs surface, and the CNTs support favored the dispersion of LDHs; meanwhile, a mechanism for growing the LDHs on CNTs was proposed, and the reported methods could be expanded to prepare other LDHs/CNT composites. After reduction, due to the strong interaction between CuCo-LDHs and CNTs, Cu–Co alloy, nanoparticles with small and uniform size were obtained and highly dispersed on the Al 2 O 3 matrix and CNTs surface. In particular, the high thermal conductivity of CNTs suppressed the formation of hot spots, thus effectively inhibited the generation of hydrocarbons and CO 2 . The resultant CuCo-LDHs/CNTs composite exhibited better catalytic performance and higher selectivity to C 2+ alcohols than the pristine LDHs did, which turned out to be one of the best catalysts for HAS. Graphical Abstract
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 PROCESSING TECHNOLOGY
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2022
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IF 8.129
Xiudong Zhu,Yunshan Shang,Jingyun Chen,Hui Wei,Deping Xu,Xiongchao Lin,Yonggang Wang
A series of lanthanum oxide modified Cu Co based catalysts for the direct conversion of syngas to higher alcohols were synthesized via the coprecipitation method. The influence of lanthanum on the textural properties and catalytic performance was investigated. It was found that lanthanum-modified Cu Co based catalysts possessed a novel nanosheet structure to form more oxygen vacancies . Compared with CuCo catalyst, the dissociative CO adsorption and associative CO adsorption capacities of La x CuCo catalysts were improved markedly, and formate and methoxy intermediates were more easily formed on the surface of La x CuCo catalysts, which is attributed to the proper synergy of the surface active sites (Cu 0 , Co 0 , and oxygen vacancies). In particular, the addition of lanthanum species reduced the thickness of the nanosheets and facilitated the high dispersion of La x CuCo after reaction by acting as isolation islands to restrain the aggregation and growth of crystal grain. The evaluation results showed that optimized La 0.3 CuCo catalyst exhibited the highest CO conversion of 25.4%, superior total alcohols selectivity of 61.4%, and C 2+ alcohols selectivity of 79.03% among the total alcohol products, and excellent stability.
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
Biomass Conversion and Biorefinery
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2022
·Vol. 13
·期 15
·14049-14058
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IF 4.05
Yan Mi,Zhang Yan,Grisdanurak Nurak,Wibowo Haryo,Yu Caimeng,Kanchanatip Ekkachai
One outstanding advantage of supercritical water gasification (SCWG) coupled with CO 2 capture and storage (CCS) technology is to realize the conversion of bio-waste into hydrogen-rich syngas. In this study, metal organic frameworks of copper benzene-1,3,5-tricarboxylate (Cu-BTC) were synthesized via solvothermal method with different synthesis time and used as adsorbent for capturing CO 2 from SCWG model syngas. The effect of synthesis time, adsorption temperature, and adsorption pressure on CO 2 adsorption capacity of Cu-BTC was evaluated using analysis of variance (ANOVA). The Pareto chart showed that adsorption pressure had significant effect on CO 2 adsorption capacity, and the surface plot indicated that CO 2 adsorption capacity increased with higher adsorption pressure and lower adsorption temperature. Cu-BTC with 48-h synthesis time had the largest specific surface area (1737 cm 2 /g) and pore volume (0.73 cm 3 /g), and it exhibited the highest CO 2 capacity of 19.83 mmol/g and 13.56 mmol/g at 0 °C and 25 °C, respectively. The adsorption results showed that CO 2 concentration in multi-component gas decreased from 48.75 to 12.9%, and H 2 concentration increased from 38.75 to 75.45%. Therefore, Cu-BTC has the potential for removal of CO 2 from SCWG syngas, and more work is necessary to further improve the adsorption capacity and selectivity. Graphical abstract
研究领域:
能源科学
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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
Journal of Energy Chemistry
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2022
·
IF 13.599
Chenguang Wang,Chengyan Wen,Zheng Liang,Zhipeng Tian,Qian Jiang,Yuhe Liao,Xunzhu Jiang,Lungang Chen,Qiying Liu,Longlong Ma,Michiel Dusselier
Direct conversion of syngas to aromatics has great potential to decrease fossil fuel dependence. Here, a unique structured hybrid catalyst composed of Fe 3 O 4 nanoparticles intimately dispersed inside an acidic zeolite is developed. 1 to 4 nm sized Fe 3 O 4 nanoparticles end up evenly dispersed in an acidic and slightly mesoporous Al-ZSM-5 based on Fe 3 O 4 restructuring during co-hydrothermal synthesis using organosilane modification. A very high aromatic productivity of 214 mmol aromatics h −1 g Fe −1 can be obtained with a remarkable 62% aromatic selectivity in hydrocarbons. This catalyst has excellent sintering resistance ability and maintains stable aromatics production over 570 h. The synthetic insights that postulate a mechanism for the metastable oxide-zeolite reorganization during hydrothermal synthesis could serve as a generic route to sinter-resistant oxide-zeolite composite materials with uniform, well-dispersed oxide nanoparticles in close intimacy with - and partially confined in - a zeolite matrix.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Lang Pei,Zhenggang Luo,Xusheng Wang,Zhanfeng Ma,Yuhang Nie,Jiasong Zhong,Ding Yang,Sateesh Bandaru,Bao-Lian Su
The conversion of CO 2 into syngas , a mixture of CO and H 2 , via photocatalytic reduction , is a promising approach towards achieving a sustainable carbon economy. However, the evolution of highly adjustable syngas, particularly without the use of sacrifice reagents or additional cocatalysts, remains a significant challenge. In this study, a step-scheme (S-scheme) 0D ZnGa 2 O 4 nanodots (∼7 nm) rooted g-C 3 N 4 nanosheets (denoted as ZnGa 2 O 4 /C 3 N 4 ) heterojunction photocatalyst was synthesized vis a facial in-situ growth strategy for efficient CO 2 -to-syngas conversion. Both experimental and theoretical studies have demonstrated that the polymeric nature of g-C 3 N 4 and highly distributed ZnGa 2 O 4 nanodots synergistically contribute to a strong interaction between metal oxide and C 3 N 4 support. Furthermore, the desirable S-scheme heterojunction in ZnGa 2 O 4 /C 3 N 4 efficiently promotes charge separation, enabling strong photoredox ability. As a result, the S-scheme ZnGa 2 O 4 /C 3 N 4 exhibited remarkable activity and selectivity in photochemical conversion of CO 2 into syngas, with a syngas production rate of up to 103.3 μ mol g −1 h −1 , even in the absence of sacrificial agents and cocatalyst. Impressively, the CO/H 2 ratio of syngas can be tunable within a wide range from 1:4 to 2:1. This work exemplifies the effectiveness of a meticulously designed S-scheme heterojunction photocatalyst for CO 2 -to-syngas conversion with adjustable composition , thus paving the way for new possibilities in sustainable energy conversion and utilization.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Catalysis
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2023
·
IF 12.9
Shaoxia Guo,Zhuoshi Li,Rui Yin,Jianbao Li,Zhuang Zeng,Zhiwei Hu,Guangyuan Luo,Jing Lv,Shouying Huang,Yue Wang,Xinbin Ma
Higher alcohol synthesis (HAS) from syngas is highly attractive but still challenging due to the complexity of the reaction system and the difficulty in modulating the carbon number distribution of products, especially in improving the selectivity toward ethanol or short-chain alcohols over a single catalyst. Herein, we propose a CoMnOx nanocomposite catalyst with the Co/Mn molar ratio of 1/2 prepared by the facile sol–gel method and found that it could selectively produce short-chain alcohols in the HAS. The C2-5OH proportion in the total alcohol reached 75.5 C%, in which the ethanol proportion was as high as 48.0 C%, breaking through the Anderson-Schulz–Flory distribution and outperforming most of the reported cobalt-based catalysts for HAS. Multiple characterizations and contrast experiments indicated that oxygen vacancies in MnOx that formed during reduction and reaction can dissociate CO but are inactive in C–C coupling, thus generating lots of CHx* monomers. The CHx* intermediates could react with the CO* species adsorbed on the neighboring Co2C species, greatly stimulating the production of ethanol. It is also demonstrated that the oxygen vacancies possibly facilitated the carbonization of cobalt and enhanced the alcohol selectivity, while the untransformed CoxMn1–xO was not active in the reaction. These findings may provide potentials in designing catalysts for highly selective production of ethanol and short-chain products in HAS from syngas.
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
Catalysts
·
2019
·Vol. 9
·期 2
·199
·
IF 3.444
Xiaoli Li,Junfeng Zhang,Min Zhang,Wei Zhang,Meng Zhang,Hongjuan Xie,Yingquan Wu,Yisheng Tan
The types of supports employed profoundly influence the physicochemical properties and performances of as-prepared catalysts in almost all catalytic systems. Herein, Cu catalysts, with different supports (SiO2, Al2O3), were prepared by a facile impregnation method and used for the direct synthesis of higher alcohols from CO hydrogenation. The prepared catalysts were characterized using multiple techniques, such as X-ray diffraction (XRD), N2sorption, H2-temperature-programmed reduction (H2-TPR), temperature-programmed desorption of ammonia (NH3-TPD), X-ray photoelectron spectroscopy (XPS) and in situ Fourier-transform infrared spectroscopy (FTIR), etc. Compared to the Cu/Al2O3catalyst, the Cu/SiO2catalyst easily promoted the formation of a higher amount of C1 oxygenate species on the surface, which is closely related to the formation of higher alcohols. Simultaneously, the Cu/Al2O3and Cu/SiO2catalysts showed obvious differences in the CO conversion, alcohol distribution, and CO2selectivity, which were probably originated from differences in the structural and physicochemical properties, such as the types of copper species, the reduction behaviors, acidity, and electronic properties. Besides, it was also found that the gap in performances in two kinds of catalysts with the different supports could be narrowed by the addition of potassium because of its neutralization to surface acidy of Al2O3and the creation of new basic sites, as well as the alteration of electronic properties.
研究领域:
催化化学
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能源化学
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材料化学
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工业催化
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表面科学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2026
·
IF 3.4
Jingyi Zhang,Jiaming Wu,Yuren Zhao,Keyan Li,Xinwen Guo
Photocatalytic conversion of CO2 and H2O into syngas offers a green and sustainable pathway for the production of chemical feedstocks. However, most high-yield syngas production systems rely on a noble metal photosensitizer or cocatalyst, making it challenging to obtain cost-effective syngas. In this work, we designed and prepared S-scheme TiO2/CN heterojunctions with varying mass ratios by calcining the mixture of NH2-MIL-125(Ti) and pristine carbon nitride (CN). The combination of TiO2 with CN significantly enhances visible light absorption, and the formation of an S-scheme heterojunction effectively improves the separation and migration of photogenerated carriers. In addition, the enlarged specific surface area as well as the enhanced CO2 adsorption capacity also promote the photocatalytic CO2 reduction. Without any noble metal photosensitizer or cocatalyst, the 150TiO2/CN heterojunction demonstrated excellent performance to produce syngas. The production rates of CO and H2 are 6.2 and 1.9 mmol g–1 h–1, respectively, and the syngas production rate was 3.4 and 29.5 times that of pure CN and TiO2, respectively, when high-purity CO2 is used as the feed gas and the ratio of H2O/MeCN in solvent is 1:4. By adjustment of the composition of feed gas and solvent, high yield syngas with widely tunable CO/H2 ratios from 3.3:1 to 1:3.7 was achieved, and the maximum syngas production rate reached 12.1 mmol g–1 h–1. This work provides insights into the design of highly efficient photocatalysts for CO2 conversion to fuels or chemicals.
✓ 已验证
DOI
高影响因子
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