China is short of potassium resources, it only produces about 30 t of potash fertilizers per year. While China used about 650 t of potash fertilizer in 2000 by importing more than 95% of its potash fertilizers from Ca...China is short of potassium resources, it only produces about 30 t of potash fertilizers per year. While China used about 650 t of potash fertilizer in 2000 by importing more than 95% of its potash fertilizers from Canada or Europe. So, using varieties with high K utilization efficiency was very important.展开更多
The reverse water gas shift reaction(RWGS)can convert CO_(2) into green syngas,but its efficiency is limited by a low CO_(2) utilization rate.High temperatures can promote CO_(2) conversion rates in RWGS;however,most ...The reverse water gas shift reaction(RWGS)can convert CO_(2) into green syngas,but its efficiency is limited by a low CO_(2) utilization rate.High temperatures can promote CO_(2) conversion rates in RWGS;however,most catalysts are unstable and inactive at high temperatures.In this study,we synthesized a two-dimensional high-entropy oxide to stabilize Pt single atoms(Pt@CeYLaScZrO_(x))for high-temperature RWGS.Compared to the 494 mmol g^(−1) h^(−1) CO production rate of Pt@ZrO_(2) at 600℃ in RWGS,Pt@CeYLaScZrO_(x) exhibited a significantly higher CO production rate of 1350 mmol g^(−1) h^(−1),a CO_(2) conversion rate of 55%and stable operation for 72 h at 600℃,exhibiting unparalleled high-temperature stability.Various characterizations confirmed the robustness of Pt single atoms in Pt@CeYLaScZrO_(x) during high-temperature RWGS,and theoretical calculations indicated that the high-entropy property of CeYLaScZrO_(x) contributed to the thermodynamically stable state of Pt single atoms,preventing Pt sintering.As a result,Pt@CeYLaScZrO_(x) could operate in photothermal RWGS under 3.2 kW m^(−2) intensity of sunlight irradiation,achieving a CO generation rate of~13.6 ml min^(−1),a CO_(2) conversion rate of 45%and stable operation for 100 h.This work provides a universal solution for preparing noble metal single-atom catalysts that remain stable under hydrogen-rich and high-temperature environments.展开更多
文摘China is short of potassium resources, it only produces about 30 t of potash fertilizers per year. While China used about 650 t of potash fertilizer in 2000 by importing more than 95% of its potash fertilizers from Canada or Europe. So, using varieties with high K utilization efficiency was very important.
基金supported by the Natural Science Foundation of Hebei Province(Grant No.B2022201090,B2023204034,B2023201107,B2021201074,2023HBQZYCXY001,and B2024201096)the National Natural Science Foundation of China(Grant No.52371220,U23A20139)the Hebei Education Department(Grant No,QN2022059),and Hebei University(050001-521100302025,050001-513300201004).
文摘The reverse water gas shift reaction(RWGS)can convert CO_(2) into green syngas,but its efficiency is limited by a low CO_(2) utilization rate.High temperatures can promote CO_(2) conversion rates in RWGS;however,most catalysts are unstable and inactive at high temperatures.In this study,we synthesized a two-dimensional high-entropy oxide to stabilize Pt single atoms(Pt@CeYLaScZrO_(x))for high-temperature RWGS.Compared to the 494 mmol g^(−1) h^(−1) CO production rate of Pt@ZrO_(2) at 600℃ in RWGS,Pt@CeYLaScZrO_(x) exhibited a significantly higher CO production rate of 1350 mmol g^(−1) h^(−1),a CO_(2) conversion rate of 55%and stable operation for 72 h at 600℃,exhibiting unparalleled high-temperature stability.Various characterizations confirmed the robustness of Pt single atoms in Pt@CeYLaScZrO_(x) during high-temperature RWGS,and theoretical calculations indicated that the high-entropy property of CeYLaScZrO_(x) contributed to the thermodynamically stable state of Pt single atoms,preventing Pt sintering.As a result,Pt@CeYLaScZrO_(x) could operate in photothermal RWGS under 3.2 kW m^(−2) intensity of sunlight irradiation,achieving a CO generation rate of~13.6 ml min^(−1),a CO_(2) conversion rate of 45%and stable operation for 100 h.This work provides a universal solution for preparing noble metal single-atom catalysts that remain stable under hydrogen-rich and high-temperature environments.
