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276 results on '"Lu, Ji-Qing"'

65. Efficient and Selective Electroreduction of CO2 to HCOOH over Bismuth‐Based Bromide Perovskites in Acidic Electrolytes.

Author

Wang, Yan, Wang, Chun, Wei, Yi, Wei, Fang, Kong, Lichun, Feng, Jiuju, Lu, Ji‐Qing, Zhou, Xiaocheng, and Yang, Fa

Subjects
ELECTROLYTIC reduction, ELECTROLYTES, PEROVSKITE, ACTIVATION energy, METAL halides, OPTOELECTRONIC devices, CHEMICAL weathering, HYDROGEN evolution reactions
Abstract

Metal halide perovskites, primarily used as optoelectronic devices, have not been applied for electrochemical conversion due to their insufficient stability in moisture. Herein, two bismuth‐based perovskites are introduced as novel electrocatalysts to convert CO2 into HCOOH in aqueous acidic media (pH 2.5), exhibiting a high Faradaic efficiency for HCOOH of >80 % in a wide potential range from −0.75 to −1.25 V. Their structural evolution against water was dynamically monitored by in situ spectra. Theoretical calculations further reveal that the formation of intermediate OCHO* on bismuth sites of Cs3Bi2Br9(111) play a pivotal role toward HCOOH production, which has a lower energy barrier than that on Cs2AgBiBr6(001) surfaces. Significantly, CO2 reacts with protons instead of water which can enhance CO2 reduction rate and suppress hydrogen evolution by avoiding carbonate formation in acidic electrolytes. This work paves the way for the extensive investigation of halide perovskites in aqueous systems. [ABSTRACT FROM AUTHOR]

Published
2022
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71. Functional Porous Ionic Polymers as Efficient Heterogeneous Catalysts for the Chemical Fixation of CO 2 under Mild Conditions.

Author

Dai, Zhifeng, Long, Yang, Liu, Jianliang, Bao, Yuanfei, Zheng, Liping, Ma, Jiacong, Liu, Jiayi, Zhang, Fei, Xiong, Yubing, and Lu, Ji-Qing

Subjects
HETEROGENEOUS catalysts, CONDUCTING polymers, CARBON dioxide, POROUS polymers, CATALYTIC activity, RING formation (Chemistry), PHOSPHONIUM compounds
Abstract

The development of efficient and metal-free heterogeneous catalysts for the chemical fixation of CO2 into value-added products is still a challenge. Herein, we reported two kinds of polar group (−COOH, −OH)-functionalized porous ionic polymers (PIPs) that were constructed from the corresponding phosphonium salt monomers (v-PBC and v-PBH) using a solvothermal radical polymerization method. The resulting PIPs (POP-PBC and POP-PBH) can be used as efficient bifunctional heterogeneous catalysts in the cycloaddition reaction of CO2 with epoxides under relatively low temperature, ambient pressure, and metal-free conditions without any additives. It was found that the catalytic activities of the POP-PBC and POP-PBH were comparable with the homogeneous catalysts of Me-PBC and PBH and were higher than that of the POP-PPh3-COOH that was synthesized through a post-modification method, indicating the importance of the high concentration catalytic active sites in the heterogeneous catalysts. Reaction under low CO2 concentration conditions showed that the activity of the POP-PBC (with a conversion of 53.8% and a selectivity of 99.0%) was higher than that of the POP-PBH (with a conversion of 32.3% and a selectivity of 99.0%), verifying the promoting effect of the polar group (−COOH group) in the porous framework. The POP-PBC can also be recycled at least five times without a significant loss of catalytic activity, indicating the high stability and robustness of the PIPs-based heterogeneous catalysts. [ABSTRACT FROM AUTHOR]

Published
2022
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73. Metal-Free Ceria Catalysis for Selective Hydrogenation of Crotonaldehyde

Author

Zhang, Zhenhua, primary, Wang, Zhi-Qiang, additional, Li, Zhaorui, additional, Zheng, Wan-Bin, additional, Fan, Liping, additional, Zhang, Jing, additional, Hu, Yi-Ming, additional, Luo, Meng-Fei, additional, Wu, Xin-Ping, additional, Gong, Xue-Qing, additional, Huang, Weixin, additional, and Lu, Ji-Qing, additional

Published
2020
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79. CO and C3H8 total oxidation over Pd catalysts supported on commercial Ce-Zr solid solution: Effects of the calcination temperature and hydrothermal treatment

Author

Zhang Xuanyu, LU Ji-Qing, HU Geng-Shen, Zhou Renmei, and Luo Mengfei

Subjects
Chemistry, law, Metallurgy, Hydrothermal treatment, Calcination, General Chemistry, Hydrothermal circulation, Incipient wetness impregnation, law.invention, Nuclear chemistry, Solid solution, Catalysis
Abstract

A series of Pd catalysts supported on commercial Ce-Zr solid solution(Pd/CZ) calcined at different temperatures( 750, 900 and 1050 °C) was prepared via an incipient wetness impregnation method. The activities of the fresh and hydrothermally aged Pd/CZ catalysts were tested for total oxidation of CO and C3H8. For CO oxidation, the activity of either fresh or aged Pd/CZ catalysts decreased with the elevating of calcination temperature of CZ support, with a fresh catalyst calcined at 750 °C possessing the highest activity and hydrothermal stability. For C3H8 total oxidation, the activity of Pd/CZ catalysts could be improved by increasing the calcination temperature of support. However, the aged Pd/CZ catalysts showed higher activity than corresponding fresh Pd/CZ catalysts. The turnover frequency( TOF) over Pd/CZ catalyst for CO oxidation increased with increasing reduction ability of the catalysts, with a fresh catalyst calcined at 750 °C having the highest value(0.27 s−1). However, the TOF of Pd/CZ catalyst for C3H8 total oxidation was mainly affected by the size of Pd particles, and large Pd particles possessed a higher activity, with the highest TOF value(0.96 s−1) obtained over an aged catalyst calcined at 1050 °C.

Published
2015

80. Zinc Oxide Morphology‐Dependent Pd/ZnO Catalysis in Base‐Free CO2 Hydrogenation into Formic Acid.

Author

Zhang, Jing, Fan, Liping, Zhao, Feiyue, Fu, Yanghe, Lu, Ji‐Qing, Zhang, Zhenhua, Teng, Botao, and Huang, Weixin

Subjects
FORMIC acid, ZINC oxide, CATALYSIS, HYDROGENATION, CARBON dioxide, CATALYSTS, PALLADIUM oxides
Abstract

Pd/ZnO catalysts with ca. 2 wt.% Pd loading employing ZnO nanocrystals with various morphologies as supports, including ZnO nanoplates (p−ZnO) predominantly exposing polar {002} facets, ZnO nanorods (r−ZnO) predominantly exposing nonpolar {100} and {101} facets, and commercial ZnO (c−ZnO) exposing random facets, have been prepared as catalysts for the catalytic reaction of CO2 hydrogenation into formic acid (FA) without the addition of base under mild conditions. A remarkable morphology‐dependence of zinc oxide in the Pd/ZnO catalysts was observed. Catalytic activities of various Pd/ZnO catalysts in CO2 hydrogenation into FA follow an order of Pd/r−ZnO>Pd/p−ZnO>Pd/c−ZnO, and all the catalysts are stable. Kinetic study, CO2‐TPD analysis, and in situ DRIFTS spectra provide evidence that all the Pd/ZnO catalysts follow a similar catalytic mechanism that CO2 activation is the rate‐determining step. Consequently, r−ZnO, possessing a higher density of weak basic sites than p−ZnO and c−ZnO, can act as a superb support to prepare Pd/r−ZnO catalyst, which is more active than Pd/p−ZnO and Pd/c−ZnO catalysts for the production of FA. These findings nicely demonstrate the crystal‐plane engineering of the metal oxide support in tuning the catalytic performance of Pd‐based catalysts for CO2 hydrogenation into FA. [ABSTRACT FROM AUTHOR]

Published
2020
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