ACS Sustainable Chemistry & Engineering
·
2022
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IF 9.224
Chao Miao,Kaixuan Shang,Lixing Liang,Shumei Chen,Jing Ouyang
In this work, a Ni-based catalyst supported on a core–shell structure catalytic carrier material (Ni/ZSM-5@MCM-41) based on kaolinite tailings is reported, which exhibits excellent CO2 methanation performance at atmospheric pressure. At 400 °C, CO2 conversion and CH4 selectivity reach 80 and 97% with the space velocity of 12,000 mL gcat–1 h–1, respectively, and it can maintain good stability during the 80 h stability test. Compared with traditional Ni/ZSM-5 and Ni/MCM-41 catalysts, Ni/ZSM-5@MCM-41 has more substantial confinement effects on the active components, and the active components are more evenly dispersed on surface of the carrier. In addition, it is confirmed by the in situ diffuse reflectance infrared Fourier transform spectroscopy technique that CO2 methanation over the Ni/ZSM-5@MCM-41 catalyst follows the path of formate and CO as intermediates.
研究领域:
催化
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化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Xiaoxuan Ma,Tianyang Guo,Peng Fu,Zhiyu Li,Kaiwei Sun,Liang Zheng,Huiyan Zhang
Aromatic hydrocarbons (AHs) production from in-situ catalytic co-pyrolysis (CCP) of biomass and plastics is a promising technology. However, the combined effects of the mixing mode and proportion of raw materials in catalytic co-pyrolysis and the double-size effect of micro-mesoporous core-shell catalysts on AHs production remain questionable. The formation characteristics and mechanism of AHs in CCP process were studied from mass transfer and free radial direction. The results showed that the yield of BTEX (benzene, toluene, ethylbenzene, and xylene) was 20.44 wt% when the mass ratio of cellulose/polyethylene/cellulose (C-P-C) was 0.5:1:0.5 at 500 ℃. The free radicals generated during the breaking of polyethylene bonds can promote the transfer of hydrogen atoms to cellulose pyrolysis intermediates, which results in mass transfer effect. The C-P-C loading mode makes hydrogen atoms always pass through the cellulose without escaping, and the increase of polyethylene ratio makes the number of hydrogen free radicals increase significantly, both of which jointly regulate the hydrogen free radical mass transfer efficiency. However, the high concentration of hydrogen free radicals can quench the pyrolysis of cellulose. The conjugated double size effect of ZSM-5 @MCM-41 leads to their greater catalytic capacity for free radical carrying co-pyrolysis products compared to ZSM-5. With the increase of mesoporous shell, the yield of BTEX increases first and then decreases, but the yield of coke is opposite. The BTEX yield of 1.0SH-Z5 @ M41 is 3.15 times that of ZSM-5, and the coke yield is only 14.70% that of ZSM-5. The reaction pathway of promoting cellulose pyrolysis by polyethylene and the mechanism of hydrogen free radical - mass transfer co-pyrolysis involved were put forward.
研究领域:
能源与环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Jiarong Li,Zhe Liu,Guangfa Hu,Ruimin Gao,Ronglan Zhang,Jianshe Zhao
A series of hybrid catalyst PMoW@HKUST-1@ZSM-5-MCM-41 was prepared in which H 3 PMo 6 W 6 O 40 were supported in the pore of micro/mesoporous materials ZSM-5-MCM-41 and HKUST-1 by one-pot method. Five types of ZSM-5-MCM-41 were prepared and corresponding ODS catalysts PMOW@HKUST-1@ZSM-5-MCM-41 were synthesized. The prepared catalysts were characterized and the most efficient catalyst was selected by XRD, FT-IR, UV–vis, N 2 adsorption-desorption, SEM, TEM. The removal of DBT reached 98.13 % by using PMoW@HKUST-1@ZSM-5-MCM-41−2 under 60 °C with molecular oxygen as oxidant after 150 min. After desulfurization, the catalyst can be simply recovered and reused 7 times with an unnoticeable decrease in catalytic activity, indicating the successful combination of heteropolyacids and micro/mesoporous materials for desulfurization.
研究领域:
化学工程
·
催化材料
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2019
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IF 3.782
Li Renna,Chong Shijia,Altaf Naveed,Gao Yanshan,Louis Benoit,Wang Qiang
In this research, we investigated the hydrophobicity and dynamic adsorption-desorption behaviors of volatile organic compounds (VOCs) by applying different optimized coating dosage (25, 50, and 75%) on designed novel ZSM-5/MCM-41 and ZSM-5/Silicalite-1 hierarchical composites. The relatively large specific surface area and pore volume of adsorbents ZSM-5/MCM-41 and ZSM-5/Silicalite-1 composites with excellent stability were affirmed by ex-situ XRD, FTIR, BET, SEM, and water contact angle analyses. Regarding, toluene adsorption-desorption investigation, ZSM-5/MCM-41 composite lead a longer stable toluene breakthrough time no matter under dry or 50% humid conditions. However, under different loading dosage condition, the breakthrough time of 75% coating ratio was the longest, which was 1.6 times as long as that of pure ZSM-5 under wet adsorption. Meanwhile, the complete elimination of toluene for ZSM-5/MCM-41-75% was done by largest desorption peak area and the lowest desorption temperature of 101.9°C, while, the largest contact angle of ZSM-5/MCM-41-75% was 17.0° higher than pure ZSM-5 zeolite. Therefore, we believe that the present hydrophobic sorbent will provide new insight with great research potential for removing low concentration of VOCs at industrial scale.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）