@article{wang_gao_krzystowczyk_iftikhar_dou_cai_wang_ruan_ye_li_2022, title={High-throughput oxygen chemical potential engineering of perovskite oxides for chemical looping applications}, volume={2}, ISSN={["1754-5706"]}, url={https://doi.org/10.1039/D1EE02889H}, DOI={10.1039/d1ee02889h}, abstractNote={Integrating DFT, machine learning and experimental verifications, a high-throughput screening scheme is performed to rationally engineer the redox properties of SrFeO 3− δ based perovskites for chemical looping applications.}, number={4}, journal={ENERGY & ENVIRONMENTAL SCIENCE}, publisher={Royal Society of Chemistry (RSC)}, author={Wang, Xijun and Gao, Yunfei and Krzystowczyk, Emily and Iftikhar, Sherafghan and Dou, Jian and Cai, Runxia and Wang, Haiying and Ruan, Chongyan and Ye, Sheng and Li, Fanxing}, year={2022}, month={Feb} }
 @article{ruan_wang_wang_zheng_li_lin_liu_li_wang_2022, title={Selective catalytic oxidation of ammonia to nitric oxide via chemical looping}, volume={13}, ISSN={["2041-1723"]}, url={https://doi.org/10.1038/s41467-022-28370-0}, DOI={10.1038/s41467-022-28370-0}, abstractNote={Abstract Selective oxidation of ammonia to nitric oxide over platinum-group metal alloy gauzes is the crucial step for nitric acid production, a century-old yet greenhouse gas and capital intensive process. Therefore, developing alternative ammonia oxidation technologies with low environmental impacts and reduced catalyst cost are of significant importance. Herein, we propose and demonstrate a chemical looping ammonia oxidation catalyst and process to replace the costly noble metal catalysts and to reduce greenhouse gas emission. The proposed process exhibit near complete NH 3 conversion and exceptional NO selectivity with negligible N 2 O production, using nonprecious V 2 O 5 redox catalyst at 650 o C. Operando spectroscopy techniques and density functional theory calculations point towards a modified, temporally separated Mars-van Krevelen mechanism featuring a reversible V 5+ /V 4+ redox cycle. The V = O sites are suggested to be the catalytically active center leading to the formation of the oxidation products. Meanwhile, both V = O and doubly coordinated oxygen participate in the hydrogen transfer process. The outstanding performance originates from the low activation energies for the successive hydrogen abstraction, facile NO formation as well as the easy regeneration of V = O species. Our results highlight a transformational process in extending the chemical looping strategy to producing base chemicals in a sustainable and cost-effective manner.}, number={1}, journal={NATURE COMMUNICATIONS}, publisher={Springer Science and Business Media LLC}, author={Ruan, Chongyan and Wang, Xijun and Wang, Chaojie and Zheng, Lirong and Li, Lin and Lin, Jian and Liu, Xiaoyan and Li, Fanxing and Wang, Xiaodong}, year={2022}, month={Feb} }
 @article{ohayon dahan_landau_vidruk nehemya_edri_herskowitz_ruan_li_2021, title={Core-Shell Fe2O3@La1-xSrxFeO3-delta Material for Catalytic Oxidations: Coverage of Iron Oxide Core, Oxygen Storage Capacity and Reactivity of Surface Oxygens}, volume={14}, ISSN={["1996-1944"]}, url={https://www.mdpi.com/1996-1944/14/23/7355}, DOI={10.3390/ma14237355}, abstractNote={A series of Fe2O3@LSF (La0.8Sr0.2FeO3-δ perovskite) core-shell materials (CSM) was prepared by infiltration of LSF precursors gel containing various complexants and their mixtures to nanocrystalline aggregates of hematite followed by thermal treatment. The content of LSF phase and amount of carboxyl groups in complexant determine the percent coverage of iron oxide core with the LSF shell. The most conformal coating core-shell material was prepared with citric acid as the complexant, contained 60 wt% LSF with 98% core coverage. The morphology of the CSM was studied by HRTEM-EELS combined with SEM-FIB for particles cross-sections. The reactivity of surface oxygen species and their amounts were determined by H2-TPR, TGA-DTG, the oxidation state of surface oxygen ions by XPS. It was found that at complete core coverage with perovskite shell, the distribution of surface oxygen species according to redox reactivity in CSM resemble pure LSF, but its lattice oxygen storage capacity is 2-2.5 times higher. At partial coverage, the distribution of surface oxygen species according to redox reactivity resembles that in iron oxide.}, number={23}, journal={MATERIALS}, publisher={MDPI AG}, author={Ohayon Dahan, Hen and Landau, Miron V. and Vidruk Nehemya, Roxana and Edri, Eran and Herskowitz, Moti and Ruan, Chongyan and Li, Fanxing}, year={2021}, month={Dec} }