三维结构的分子筛既是天然存在的,也可以在实验室中合成。沸石分子筛具有广泛的应用,如环境修复,催化活性,生物技术应用,气体传感和医疗应用。虽然天然分子筛很容易获得,但由于其易于纯相合成,离子交换能力好,尺寸均匀等优点,目前越来...三维结构的分子筛既是天然存在的,也可以在实验室中合成。沸石分子筛具有广泛的应用,如环境修复,催化活性,生物技术应用,气体传感和医疗应用。虽然天然分子筛很容易获得,但由于其易于纯相合成,离子交换能力好,尺寸均匀等优点,目前越来越重视分子筛的合成。近年来,如何从低成本材料合成分子筛,特别是如何解决主要的环境问题,也受到了人们的广泛关注。在不同的合成方法中,水热法被广泛应用于以粉煤灰、稻壳灰、高炉渣和高岭土等廉价原料合成各种分子筛。因此,本文对分子筛合成方法及其在环境工程中的潜在应用进行综述。Molecular sieves with the three-dimensional structures occur naturally or can be synthesized in the laboratory. Zeolites have versatile applications such as environmental remediation, catalytic activity, biotechnological application, gas sensing and medicinal applications. Although, naturally occurring molecular sieves are readily available, nowadays, more emphasis is given on the synthesis of the molecular sieves due to their easy synthesis in the pure form, better ion exchange capabilities and uniform in size. Recently, much attention has also been paid on how molecular sieve is being synthesized from low-cost material, particularly, by resolving the major environmental issues. Among different synthesis methods, hydrothermal method is commonly found to be used widely in the synthesis of various molecular sieves from inexpensive raw materials such as fly ash, rice husk ash, blast furnace slag and kaolin. Hence, the main purpose of this review is to make an effective resolution of molecular sieve synthesis methods together with potential applications in environmental engineering.展开更多
钙钛矿氧化物(ABO3)催化剂具有高活性和热稳定性,以及可调节的元素组成和可调控的氧化还原性质,使其性能得到改善,因此是VOCs催化氧化领域最具竞争力的材料之一。尽管ABO3催化剂具有广泛的应用潜力,但其使用受到失活和烧结敏感性的限制...钙钛矿氧化物(ABO3)催化剂具有高活性和热稳定性,以及可调节的元素组成和可调控的氧化还原性质,使其性能得到改善,因此是VOCs催化氧化领域最具竞争力的材料之一。尽管ABO3催化剂具有广泛的应用潜力,但其使用受到失活和烧结敏感性的限制,这可能会影响其长期性能,从而限制其在工业中的使用。本文从非掺杂、掺杂(A位点、B位点和A/B位点掺杂)和负载型ABO3三个方面总结了当前研究的相关进展。与非掺杂ABO3氧化物相比,掺杂型催化剂表现出更高的活性和稳定性。此外,本文提出了ABO3氧化物催化氧化VOCs存在的三种机理。最后,对ABO3催化剂催化VOCs燃烧的问题及展望进行了探讨,为进一步设计新型高效低温催化剂提供了思路。Perovskite oxide (ABO3) catalysts are among the most competitive substances in the domain of volatile organic compounds (VOCs) catalytic oxidation because of their high activity, thermal stability, adjustable elemental composition and flexible structure. Despite the broad range of potential applications of ABO3 catalysts, their utilization is constrained by inactivation and sintering susceptibility, which could impact their long-term performance and thereby limit their application in industry. In this article, the contemporary research progress is summarized from three aspects: non-doping, doping (doping at A site, B site and A/B site) and supported ABO3. Compared with undoped ABO3 oxides, doped catalysts demonstrated higher activity and stability. Three mechanisms of VOCs catalytic oxidation were put forward. Ultimately, the problems and prospects of VOCs combustion catalyzed by ABO3 catalysts were discussed, which provided insights for the further design of new high-efficiency and low-temperature catalysts.展开更多
文摘三维结构的分子筛既是天然存在的,也可以在实验室中合成。沸石分子筛具有广泛的应用,如环境修复,催化活性,生物技术应用,气体传感和医疗应用。虽然天然分子筛很容易获得,但由于其易于纯相合成,离子交换能力好,尺寸均匀等优点,目前越来越重视分子筛的合成。近年来,如何从低成本材料合成分子筛,特别是如何解决主要的环境问题,也受到了人们的广泛关注。在不同的合成方法中,水热法被广泛应用于以粉煤灰、稻壳灰、高炉渣和高岭土等廉价原料合成各种分子筛。因此,本文对分子筛合成方法及其在环境工程中的潜在应用进行综述。Molecular sieves with the three-dimensional structures occur naturally or can be synthesized in the laboratory. Zeolites have versatile applications such as environmental remediation, catalytic activity, biotechnological application, gas sensing and medicinal applications. Although, naturally occurring molecular sieves are readily available, nowadays, more emphasis is given on the synthesis of the molecular sieves due to their easy synthesis in the pure form, better ion exchange capabilities and uniform in size. Recently, much attention has also been paid on how molecular sieve is being synthesized from low-cost material, particularly, by resolving the major environmental issues. Among different synthesis methods, hydrothermal method is commonly found to be used widely in the synthesis of various molecular sieves from inexpensive raw materials such as fly ash, rice husk ash, blast furnace slag and kaolin. Hence, the main purpose of this review is to make an effective resolution of molecular sieve synthesis methods together with potential applications in environmental engineering.
文摘钙钛矿氧化物(ABO3)催化剂具有高活性和热稳定性,以及可调节的元素组成和可调控的氧化还原性质,使其性能得到改善,因此是VOCs催化氧化领域最具竞争力的材料之一。尽管ABO3催化剂具有广泛的应用潜力,但其使用受到失活和烧结敏感性的限制,这可能会影响其长期性能,从而限制其在工业中的使用。本文从非掺杂、掺杂(A位点、B位点和A/B位点掺杂)和负载型ABO3三个方面总结了当前研究的相关进展。与非掺杂ABO3氧化物相比,掺杂型催化剂表现出更高的活性和稳定性。此外,本文提出了ABO3氧化物催化氧化VOCs存在的三种机理。最后,对ABO3催化剂催化VOCs燃烧的问题及展望进行了探讨,为进一步设计新型高效低温催化剂提供了思路。Perovskite oxide (ABO3) catalysts are among the most competitive substances in the domain of volatile organic compounds (VOCs) catalytic oxidation because of their high activity, thermal stability, adjustable elemental composition and flexible structure. Despite the broad range of potential applications of ABO3 catalysts, their utilization is constrained by inactivation and sintering susceptibility, which could impact their long-term performance and thereby limit their application in industry. In this article, the contemporary research progress is summarized from three aspects: non-doping, doping (doping at A site, B site and A/B site) and supported ABO3. Compared with undoped ABO3 oxides, doped catalysts demonstrated higher activity and stability. Three mechanisms of VOCs catalytic oxidation were put forward. Ultimately, the problems and prospects of VOCs combustion catalyzed by ABO3 catalysts were discussed, which provided insights for the further design of new high-efficiency and low-temperature catalysts.
