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Ali D, Li Z, Azim MM, Lein HL, Mathisen K. Pinpointing basic sites formed upon incorporation of iron in hierarchical SAPO-11 using catalytic model reactions. Dalton Trans 2022; 51:15251-15262. [PMID: 36124917 DOI: 10.1039/d2dt02263j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
By utilizing previously established catalytic model reactions, a method for probing the topological location of transition metal sites incorporated in hierarchical silicoaluminophosphates (SAPOs) is presented. For the first time, iron(III)-incorporated hierarchical SAPO-11 (FeCTAB-11) was prepared and thoroughly characterized with conventional iron(III)-incorporated SAPO-11 (FeSAPO-11) as a reference. Initially, inductively coupled plasma - mass spectrometry (ICP-MS) indicated that the FeSAPOs contained similar amounts of metal (∼2.0 wt%), while N2-physisorption confirmed the bimodal porosity of the hierarchical FeCTAB-11. Furthermore, X-ray absorption spectroscopy (XAS) revealed that iron(III) was isomorphously incorporated into both SAPO-11 samples, whereas CO2-temperature programmed desorption (TPD) revealed the first reported presence of strong basic sites in the vicinity of a transition metal incorporated into a SAPO framework. The location of the basic sites, and thus the incorporated iron, was subsequently probed by studying the products of the base-catalyzed vapor phase isomerization of cyclohexanone oxime (Beckmann rearrangement, BMR) model reaction. Through an increased lifetime for the base-catalyzed production of aniline, the incorporated iron for FeCTAB-11 was found to be located in highly accessible mesopores, whereas the conventional FeSAPO-11 had incorporated iron located in its micropores. Lastly, the methanol-to-hydrocarbons (MTH) model reaction showed that both FeSAPOs only had Brønsted acid sites in the micropores of the structures. This was used to verify the pore connectivity of the hierarchical FeCTAB-11 by utilizing the base-catalyzed BMR mechanism's dependency on acid sites.
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Affiliation(s)
- Daniel Ali
- Department of Chemistry, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway.
| | - Zhihui Li
- Department of Chemical Engineering, NTNU, N-7491 Trondheim, Norway
| | - Muhammad Mohsin Azim
- Department of Chemistry, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway.
| | - Hilde Lea Lein
- Department of Materials Science and Engineering, NTNU, N-7491 Trondheim, Norway
| | - Karina Mathisen
- Department of Chemistry, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway.
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Zhou X, Chen Z, Guo Z, Yang H, Shao J, Zhang X, Zhang S. One-pot hydrothermal synthesis of dual metal incorporated CuCe-SAPO-34 zeolite for enhancing ammonia selective catalytic reduction. JOURNAL OF HAZARDOUS MATERIALS 2021; 405:124177. [PMID: 33082022 DOI: 10.1016/j.jhazmat.2020.124177] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 09/28/2020] [Accepted: 10/03/2020] [Indexed: 06/11/2023]
Abstract
A series of dual metal incorporated CuCex-SAPO-34(x = 0-0.04) samples were synthesized using one-pot hydrothermal method with diethylamine as organic structure-directing agent for selective catalytic reduction of NOx by NH3. The catalytic properties were elucidated in detail with physicochemical properties being analyzed using various instruments. All the catalysts exhibited typical SAPO-34 crystal structures with high specific surface areas. With the dual-metal incorporation, the surface acidity and amount of isolated Cu2+, which may be active sites for NH3-SCR, were significantly enhanced. However, excessive Ce restrained the formation of isolated Cu2+ due to its occupation of cationic sites. Therefore, the 0.05CuCe0.02-SAPO-34 exhibited high NO conversion (≥80%) at 168°C-500°C. Furthermore, the NH3-SCR mechanism over different catalysts was investigated in-situ DRIFTS experiments. For the 0.05Cu-SAPO-34, the adsorbed NH3 species react with gaseous NO and following the E-R mechanism throughout the reaction temperature range. Meanwhile, adsorbed NO2 was detected and reacted with the adsorbed NH3 species according to the L-H mechanism in low-temperature region. In contrast, the NH3-SCR reaction over the 0.05CuCe0.02-SAPO-34 primarily followed the E-R mechanism throughout the temperature range. The L-H mechanism was cut off due to the loss of the adsorption ability of nitrous species at high temperatures., resulting in NO conversion decreasing.
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Affiliation(s)
- Xiaoming Zhou
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China
| | - Zhuoyuan Chen
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China
| | - Zhiyong Guo
- School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China
| | - Haiping Yang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China
| | - Jingai Shao
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China
| | - Xiong Zhang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China
| | - Shihong Zhang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China
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Fe-Exchanged Small-Pore Zeolites as Ammonia Selective Catalytic Reduction (NH3-SCR) Catalysts. Catalysts 2020. [DOI: 10.3390/catal10111324] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Cu-exchanged small-pore zeolites have been extensively studied in the past decade as state-of-the-art selective catalytic reduction (SCR) catalysts for diesel engine exhaust NOx abatement for the transportation industry. During this time, Fe-exchanged small-pore zeolites, e.g., Fe/SSZ-13, Fe/SAPO-34, Fe/SSZ-39 and high-silica Fe/LTA, have also been investigated but much less extensively. In comparison to their Cu-exchanged counterparts, such Fe/zeolite catalysts display inferior low-temperature activities, but improved stability and high-temperature SCR selectivities. Such characteristics entitle these catalysts to be considered as key components of highly efficient emission control systems to improve the overall catalyst performance. In this short review, recent studies on Fe-exchanged small-pore zeolite SCR catalysts are summarized, including (1) the synthesis of small-pore Fe/zeolites; (2) nature of the SCR active Fe species in these catalysts as determined by experimental and theoretical approaches, including Fe species transformation during hydrothermal aging; (3) SCR reactions and structure-function correlations; and (4) a few aspects on industrial applications.
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Watts AE, Lozinska MM, Slawin AMZ, Mayoral A, Dawson DM, Ashbrook SE, Bode BE, Dugulan AI, Shannon MD, Cox PA, Turrina A, Wright PA. Site‐Specific Iron Substitution in STA‐28, a Large Pore Aluminophosphate Zeotype Prepared by Using 1,10‐Phenanthrolines as Framework‐Bound Templates. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202005558] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Abigail E. Watts
- EaStCHEM School of Chemistry University of St Andrews Purdie Building North Haugh St Andrews, Fife KY16 9ST UK
| | - Magdalena M. Lozinska
- EaStCHEM School of Chemistry University of St Andrews Purdie Building North Haugh St Andrews, Fife KY16 9ST UK
| | - Alexandra M. Z. Slawin
- EaStCHEM School of Chemistry University of St Andrews Purdie Building North Haugh St Andrews, Fife KY16 9ST UK
| | - Alvaro Mayoral
- Instituto de Ciencia de Materiales de Aragon (ICMA) CSIC Universidad de Zaragoza Mariano Esquillor 50018 Zaragoza Spain
- Center for High-Resolution Electron Microscopy (CħEM) School of Physical Science and Technology ShanghaiTech University 393 Middle Huaxia Road Pudong Shanghai 201210 China
| | - Daniel M. Dawson
- EaStCHEM School of Chemistry University of St Andrews Purdie Building North Haugh St Andrews, Fife KY16 9ST UK
| | - Sharon E. Ashbrook
- EaStCHEM School of Chemistry University of St Andrews Purdie Building North Haugh St Andrews, Fife KY16 9ST UK
| | - Bela E. Bode
- EaStCHEM School of Chemistry University of St Andrews Purdie Building North Haugh St Andrews, Fife KY16 9ST UK
| | - A. Iulian Dugulan
- Fundamental Aspects of Materials and Energy Group Delft University of Technology 2629 JB Delft The Netherlands
| | - Mervyn D. Shannon
- Johnson Matthey Technology Centre Chilton P.O. Box 1, Belasis Avenue Billingham TS23 1LB UK
| | - Paul A. Cox
- School of Pharmacy and Biomedical Sciences University of Portsmouth St. Michael's Building, White Swan Road Portsmouth PO1 UK
| | - Alessandro Turrina
- Johnson Matthey Technology Centre Chilton P.O. Box 1, Belasis Avenue Billingham TS23 1LB UK
| | - Paul A. Wright
- EaStCHEM School of Chemistry University of St Andrews Purdie Building North Haugh St Andrews, Fife KY16 9ST UK
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Watts AE, Lozinska MM, Slawin AMZ, Mayoral A, Dawson DM, Ashbrook SE, Bode BE, Dugulan AI, Shannon MD, Cox PA, Turrina A, Wright PA. Site-Specific Iron Substitution in STA-28, a Large Pore Aluminophosphate Zeotype Prepared by Using 1,10-Phenanthrolines as Framework-Bound Templates. Angew Chem Int Ed Engl 2020; 59:15186-15190. [PMID: 32432353 PMCID: PMC7496423 DOI: 10.1002/anie.202005558] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Indexed: 12/03/2022]
Abstract
An AlPO4 zeotype has been prepared using the aromatic diamine 1,10-phenanthroline and some of its methylated analogues as templates. In each case the two template N atoms bind to a specific framework Al site to expand its coordination to the unusual octahedral AlO4 N2 environment. Furthermore, using this framework-bound template, Fe atoms can be included selectively at this site in the framework by direct synthesis, as confirmed by annular dark field scanning transmission electron microscopy and Rietveld refinement. Calcination removes the organic molecules to give large pore framework solids, with BET surface areas up to 540 m2 g-1 and two perpendicular sets of channels that intersect to give pore space connected by 12-ring openings along all crystallographic directions.
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Affiliation(s)
- Abigail E. Watts
- EaStCHEM School of ChemistryUniversity of St AndrewsPurdie BuildingNorth HaughSt Andrews, FifeKY16 9STUK
| | - Magdalena M. Lozinska
- EaStCHEM School of ChemistryUniversity of St AndrewsPurdie BuildingNorth HaughSt Andrews, FifeKY16 9STUK
| | - Alexandra M. Z. Slawin
- EaStCHEM School of ChemistryUniversity of St AndrewsPurdie BuildingNorth HaughSt Andrews, FifeKY16 9STUK
| | - Alvaro Mayoral
- Instituto de Ciencia de Materiales de Aragon (ICMA)CSICUniversidad de ZaragozaMariano Esquillor50018ZaragozaSpain
- Center for High-Resolution Electron Microscopy (CħEM)School of Physical Science and TechnologyShanghaiTech University393 Middle Huaxia RoadPudongShanghai201210China
| | - Daniel M. Dawson
- EaStCHEM School of ChemistryUniversity of St AndrewsPurdie BuildingNorth HaughSt Andrews, FifeKY16 9STUK
| | - Sharon E. Ashbrook
- EaStCHEM School of ChemistryUniversity of St AndrewsPurdie BuildingNorth HaughSt Andrews, FifeKY16 9STUK
| | - Bela E. Bode
- EaStCHEM School of ChemistryUniversity of St AndrewsPurdie BuildingNorth HaughSt Andrews, FifeKY16 9STUK
| | - A. Iulian Dugulan
- Fundamental Aspects of Materials and Energy GroupDelft University of Technology2629 JBDelftThe Netherlands
| | - Mervyn D. Shannon
- Johnson Matthey Technology CentreChilton P.O. Box 1, Belasis AvenueBillinghamTS23 1LBUK
| | - Paul A. Cox
- School of Pharmacy and Biomedical SciencesUniversity of PortsmouthSt. Michael's Building, White Swan RoadPortsmouthPO1UK
| | - Alessandro Turrina
- Johnson Matthey Technology CentreChilton P.O. Box 1, Belasis AvenueBillinghamTS23 1LBUK
| | - Paul A. Wright
- EaStCHEM School of ChemistryUniversity of St AndrewsPurdie BuildingNorth HaughSt Andrews, FifeKY16 9STUK
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Chen W, Qiao G, Liu H, Ye S, Zheng J, Zhang N, Che L, Chen BH. Templated coordination as a tool to increase the catalytic activity of metal aluminophosphates: the case of CoAPO-11. Catal Sci Technol 2019. [DOI: 10.1039/c9cy01100e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Site shifting by templated coordination aimed at enhancing the performance during n-butene skeletal isomerization under severe conditions.
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Affiliation(s)
- Wenhan Chen
- Department of Chemical and Biochemical Engineering
- National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
| | - Guilong Qiao
- Department of Chemical and Biochemical Engineering
- National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
| | - Huijing Liu
- Department of Chemical and Biochemical Engineering
- National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
| | - Songshou Ye
- Department of Chemical and Biochemical Engineering
- National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
| | - Jinbao Zheng
- Department of Chemical and Biochemical Engineering
- National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
| | - Nuowei Zhang
- Department of Chemical and Biochemical Engineering
- National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
| | - Liming Che
- Department of Chemical and Biochemical Engineering
- National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
| | - Bing H. Chen
- Department of Chemical and Biochemical Engineering
- National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
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