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51. Hydrothermal syntheses and structural characterization of zeolite analogue compounds based on cobalt phosphate

Author

Feng, Pingyun, Bu, Xianhui, and Stucky, Galen D.

Subjects
Zeolites -- Usage, Transition metals -- Usage, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Zeolite analogues that contain transition metals are useful in industrial processes such as catalysis and gas separation. Several new zeolite structural analogues have been synthesized based on cobalt phosphate. The approach used to make zeolite analogues, could be applied to systems with diverse structural types and chemical constructions, and also be used to make structural analogues of other silicate structures.

Published
1997

52. Syntheses and characterization of chiral tetrahedral cobalt phosphates with zeolite ABW annd related frameworks

Author

Feng, Pingyun, Bu, Xianhui, Tolbert, Sarah H., and Stucky, Galen D.

Subjects
Cobalt -- Research, Zeolites -- Research, Chemistry
Abstract

The syntheses and characterizations of chiral tetrahedral cobalt phosphate compounds: MCoPO4 (M=Na, K, NH4, Rb) as well as the different types of framework structures have been described. One of the structures has the same topology as the zeolite ABW framework and the other cobalt phosphate can be viewed as a hybrid of tridymite and ABW frameworks. The cobalt phosphate compounds can be synthesized under hydrothermal conditions and their frameworks are more flexible than aluminosilicate in adapting cations of different sizes.

Published
1997

63. Cooperativity by Multi-Metals Confined in Supertetrahedral Sulfide Nanoclusters To Enhance Electrocatalytic Hydrogen Evolution

Author

Liu, Dongliang, primary, Fan, Xing, additional, Wang, Xiang, additional, Hu, Dandan, additional, Xue, Chaozhuang, additional, Liu, Yong, additional, Wang, Ying, additional, Zhu, Xing, additional, Guo, Jun, additional, Lin, Haiping, additional, Li, Youyong, additional, Zhong, Jun, additional, Li, Dongsheng, additional, Bu, Xianhui, additional, Feng, Pingyun, additional, and Wu, Tao, additional

Published
2018
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66. Modeling the catalytic site of vanadium bromoperoxidase: synthesis and structural characterization of intramolecularly H-bonded vanadium(V) oxoperoxo complexes, [VO(O (sub)2)((super)NH (sub)2 pyg (sub)2)]K and [VO(O (sub)2)((super)BrNH (sub)2 pyg (sub)2)K

Author

Kimblin, Clare, Bu, Xianhui, and Butler, Alison

Subjects
Chemistry, Inorganic -- Research, Vanadium -- Physiological aspects, Hydrogen bonding -- Physiological aspects, Oxygen -- Physiological aspects, Nitrogen -- Physiological aspects, Hydrogen -- Physiological aspects, Bromine -- Physiological aspects, Potassium -- Physiological aspects, Halides -- Physiological aspects, Halogenation -- Physiological aspects, Lysine -- Physiological aspects, Chemistry
Abstract

Research has been conducted on the vanadium haloperoxidases which catalyze organic substrates' peroxidative halogenation. The results of the crystallographic studies suggest that the hydrogen bonding between the lysine chain and vanadium(V)-bound peroxo group may cause halide oxidation.

Published
2002

69. A Strategy for Constructing Pore‐Space‐Partitioned MOFs with High Uptake Capacity for C2 Hydrocarbons and CO2.

Author

Wang, Yong, Jia, Xiaoxia, Yang, Huajun, Wang, Yanxiang, Chen, Xitong, Hong, Anh N., Li, Jinping, Bu, Xianhui, and Feng, Pingyun

Subjects
POROUS materials, ADSORPTION capacity, GAS absorption & adsorption, SORPTION, HYDROCARBONS
Abstract

Introduction of pore partition agents into hexagonal channels of MIL‐88 type (acs topology) endows materials with high tunability in gas sorption. Here, we report a strategy to partition acs framework into pacs (partitioned acs) crystalline porous materials (CPM). This strategy is based on insertion of in situ synthesized 4,4′‐dipyridylsulfide (dps) ligands. One third of open metal sites in the acs net are retained in pacs MOFs; two thirds are used for pore‐space partition. The Co2V‐pacs MOFs exhibit near or at record high uptake capacities for C2H2, C2H4, C2H6, and CO2 among MOFs. The storage capacity of C2H2 is 234 cm3 g−1 (298 K) and 330 cm3 g−1 (273 K) at 1 atm for CPM‐733‐dps (the Co2V‐BDC form, BDC=1,4‐benzenedicarboxylate). These high uptake capacities are accomplished with low heat of adsorption, a feature desirable for low‐energy‐cost adsorbent regeneration. CPM‐733‐dps is stable and shows no loss of C2H2 adsorption capacity following multiple adsorption–desorption cycles. [ABSTRACT FROM AUTHOR]

Published
2020
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70. A Strategy for Constructing Pore‐Space‐Partitioned MOFs with High Uptake Capacity for C2 Hydrocarbons and CO2.

Author

Wang, Yong, Jia, Xiaoxia, Yang, Huajun, Wang, Yanxiang, Chen, Xitong, Hong, Anh N., Li, Jinping, Bu, Xianhui, and Feng, Pingyun

Subjects
POROUS materials, ADSORPTION capacity, GAS absorption & adsorption, SORPTION, HYDROCARBONS
Abstract

Introduction of pore partition agents into hexagonal channels of MIL‐88 type (acs topology) endows materials with high tunability in gas sorption. Here, we report a strategy to partition acs framework into pacs (partitioned acs) crystalline porous materials (CPM). This strategy is based on insertion of in situ synthesized 4,4′‐dipyridylsulfide (dps) ligands. One third of open metal sites in the acs net are retained in pacs MOFs; two thirds are used for pore‐space partition. The Co2V‐pacs MOFs exhibit near or at record high uptake capacities for C2H2, C2H4, C2H6, and CO2 among MOFs. The storage capacity of C2H2 is 234 cm3 g−1 (298 K) and 330 cm3 g−1 (273 K) at 1 atm for CPM‐733‐dps (the Co2V‐BDC form, BDC=1,4‐benzenedicarboxylate). These high uptake capacities are accomplished with low heat of adsorption, a feature desirable for low‐energy‐cost adsorbent regeneration. CPM‐733‐dps is stable and shows no loss of C2H2 adsorption capacity following multiple adsorption–desorption cycles. [ABSTRACT FROM AUTHOR]

Published
2020
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74. Largest Molecular Clusters in the Supertetrahedral TnSeries

Author

Wu, Tao, Wang, Le, Bu, Xianhui, Chau, Victoria, and Feng, Pingyun

Abstract

Supertetrahedral Tnclusters are exact fragments of cubic ZnS-type lattice and are often formed in situas building units for the construction of 3-D open-framework chalcogenide materials. Small Tnclusters can also be synthesized in discrete forms, allowing them to exist as soluble species in solution. In addition to their tunable electronic and optical properties, these soluble clusters can be used as precursors for the synthesis of porous semiconducting and optical materials. However, the synthesis of large Tnclusters is a significant challenge, and for several decades prior to this work, the size of the discrete Tncluster remained at T3, with only 10 metal sites (e.g., [Cd10S4(SPh)16]4−and [M5Sn5S20]10−, M = Zn, Co). Here we report a family of discrete chalcogenide T4 clusters ([MxGa18−xSn2Q35]12−, x= 2 or 4; M = Mn, Cu, Zn; Q = S, Se) whose discovery resulted from an unusual phase transformation from a 3-D T4 covalent framework into 0-D T4 molecular clusters. The driving force for such a transformation is the perfect match in both charge density and geometry between chalcogenide clusters and protonated amine, leading to the higher stability of isolated clusters. The perfect match is achieved by using complex quaternary compositions to maximize charge tunability of the cluster. These T4 clusters are the largest molecular Tnclusters known to date and can be made in various compositions showing tunable band structures in both solution and solid state.

Published
2024
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75. S-Doped Ni(OH)2 nano-electrocatalyst confined in semiconductor zeolite with enhanced oxygen evolution activity.

Author

Hu, Dandan, Wang, Xiang, Chen, Xitong, Wang, Yanxiang, Hong, Anh N., Zhong, Jun, Bu, Xianhui, Feng, Pingyun, and Wu, Tao

Abstract

Low-cost Ni(OH)2-based nanomaterials with various structures and morphologies are promising catalysts for efficient oxygen evolution reactions (OERs). However, homogenous Ni(OH)2 nanomaterials with abundant active sites suffer from low conductivity and easy aggregation, resulting in low catalytic activity and stability. Here, we report a new synthetic method capable of generating abundant and confined S-doped β-Ni(OH)2 nanoparticles (NPs) (3–5 nm) within a 3D semiconductor substrate, metal-chalcogenide semiconductor zeolite (CSZ). This method operates via sequential fluoride-assisted cationic stripping and in situ Ni(OH)2 generation and is demonstrated here as an effective method to synthesize Ni2+-containing CSZ that are known to defy direct synthesis. The resulting composite (denoted Ni(OH)2 NPs@CSZ) exhibited excellent OER performance with a very low overpotential of only 212 mV at a current density of 10 mA cm−2 in O2-saturated 1 M KOH solution, and low Tafel slope of 64.2 mV dec−1, which is superior to that of benchmark IrO2. DFT calculations indicate that the interaction between the embedded Ni(OH)2 NPs and the dopant, S2−, from the host CSZ played a crucial role in improving OER performance. This work provides a new path for developing high-performance Ni(OH)2-based OER catalysts and may also serve as a general approach for loading large amounts of other catalytically active NPs into semiconducting open frameworks to further optimize electrocatalytic performance. [ABSTRACT FROM AUTHOR]

Published
2020
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