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Diaz Arroyo R, Hur YG, Gounder R. Influence of aluminum zoning toward external surfaces in MFI zeolites on propene oligomerization catalysis. Dalton Trans 2024; 53:12057-12063. [PMID: 38990150 DOI: 10.1039/d4dt01530d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/12/2024]
Abstract
Brønsted acid zeolites catalyze alkene oligomerization reactions, an important route to produce fuels and chemicals from light hydrocarbon feedstocks. Propene dimerization rates (per H+, 503 K) decrease monotonically with increasing crystallite size in MFI zeolites because heavy oligomer products remain occluded within microporous voids and restrict intrazeolite diffusion of reactants and products. Here, we show that the preferential zoning of framework Al centers and their associated H+ sites toward exterior surfaces of MFI crystallites in an "egg-shell" architecture minimizes the extent of diffusion-enhanced secondary reactions within a given crystallite, which increases both propene dimerization rates (per H+) and selectivity to true oligomer products. These results show that tailoring Al distributions to be spatially zoned toward external surfaces of medium-pore zeolite crystallites is efficacious at minimizing diffusion path lengths to increase alkene oligomerization rates and selectivity to true oligomer products.
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Affiliation(s)
- Ricem Diaz Arroyo
- Charles D. Davidson School of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, IN 47907, USA.
| | - Young Gul Hur
- Charles D. Davidson School of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, IN 47907, USA.
| | - Rajamani Gounder
- Charles D. Davidson School of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, IN 47907, USA.
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2
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Ma Q, Fu T, Wang Z, Li C, Wu X, Yang N, Li Z. Hollow Zeolite Nanoreactor with Double Shells for Methanol Aromatization: Explicit Recognition on Catalytic Function of Inverse Elemental Zone and Shell-Cavity. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2308502. [PMID: 38168120 DOI: 10.1002/smll.202308502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 12/04/2023] [Indexed: 01/05/2024]
Abstract
Core@shell catalyst composited of dual aluminosilicate zeolite can effectively regulate the distribution of acid sites to control hydrocarbon conversion process for the stable formation of target product. However, the diffusion restriction reduces the accessibility of inner active sites and affects synergy between core and shell. Herein, hollow ZSM-5 zeolite nanoreactor with inverse aluminum distribution and double shells are prepared and employed for methanol aromatization. It is demonstrated that the intershell cavity alleviated the steric hindrance from zeolites channel and provided more paths and pore entrance for guest molecule. Correspondingly, olefin intermediates generated from methanol over the external shell are easier to adsorb at internal acid sites for further reactions. Importantly, the diffusion of generated aromatic macromolecules to the external surface is also promoted, which slows down the formation of internal coke, and ensures the use of internal acid sites for aromatization. The aromatics selectivity of the nanoreactor remained at 8% after 154 h, while that of solid core@shell catalyst decreased to 2% after 75 h. This finding promises broader insight to improve internal active site utilization of core@shell catalyst at the diffusion level and can be great aid in the flexible design of multifunctional nanoreactors to enhance the relay efficiency.
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Affiliation(s)
- Qian Ma
- State Key Laboratory of Clean and Efficient Coal Utilization, College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, China
| | - Tingjun Fu
- State Key Laboratory of Clean and Efficient Coal Utilization, College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, China
| | - Zhuo Wang
- State Key Laboratory of Clean and Efficient Coal Utilization, College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, China
| | - Caiyan Li
- State Key Laboratory of Clean and Efficient Coal Utilization, College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, China
| | - Xueqing Wu
- State Key Laboratory of Clean and Efficient Coal Utilization, College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, China
| | - Ning Yang
- State Key Laboratory of Clean and Efficient Coal Utilization, College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, China
| | - Zhong Li
- State Key Laboratory of Clean and Efficient Coal Utilization, College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, China
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Mallette AJ, Shilpa K, Rimer JD. The Current Understanding of Mechanistic Pathways in Zeolite Crystallization. Chem Rev 2024; 124:3416-3493. [PMID: 38484327 DOI: 10.1021/acs.chemrev.3c00801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2024]
Abstract
Zeolite catalysts and adsorbents have been an integral part of many commercial processes and are projected to play a significant role in emerging technologies to address the changing energy and environmental landscapes. The ability to rationally design zeolites with tailored properties relies on a fundamental understanding of crystallization pathways to strategically manipulate processes of nucleation and growth. The complexity of zeolite growth media engenders a diversity of crystallization mechanisms that can manifest at different synthesis stages. In this review, we discuss the current understanding of classical and nonclassical pathways associated with the formation of (alumino)silicate zeolites. We begin with a brief overview of zeolite history and seminal advancements, followed by a comprehensive discussion of different classes of zeolite precursors with respect to their methods of assembly and physicochemical properties. The following two sections provide detailed discussions of nucleation and growth pathways wherein we emphasize general trends and highlight specific observations for select zeolite framework types. We then close with conclusions and future outlook to summarize key hypotheses, current knowledge gaps, and potential opportunities to guide zeolite synthesis toward a more exact science.
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Affiliation(s)
- Adam J Mallette
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Kumari Shilpa
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Jeffrey D Rimer
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
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Le TT, Qin W, Agarwal A, Nikolopoulos N, Fu D, Patton MD, Weiland C, Bare SR, Palmer JC, Weckhuysen BM, Rimer JD. Elemental zoning enhances mass transport in zeolite catalysts for methanol to hydrocarbons. Nat Catal 2023. [DOI: 10.1038/s41929-023-00927-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
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5
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Zhang L, Wang X, Shi C. Rapid solvent-free synthesis of nano-sized ZSM-5 with low Si/Al ratio at 90 °C. Inorg Chem Front 2022. [DOI: 10.1039/d2qi00298a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nano-sized ZSM-5 zeolites with wide framework Si/Al ratios are highly desired in petrochemical and other fields, whereas the synthesis suffers from cost, efficiency and environmental issues. Herein, a new protocol...
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Dai H, Lee C, Liu W, Yang T, Claret J, Zou X, Dauenhauer PJ, Li X, Rimer JD. Enhanced Selectivity and Stability of Finned Ferrierite Catalysts in Butene Isomerization. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202113077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Heng Dai
- Department of Chemical and Biomolecular Engineering University of Houston Houston TX 77204 USA
| | - Choongsze Lee
- Department of Chemical Engineering and Materials Science University of Minnesota Minneapolis MN 55455 USA
| | - Wen Liu
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Dalian 116023 China
| | - Taimin Yang
- Department of Materials and Environmental Chemistry Stockholm University 10691 Stockholm Sweden
| | - Jakob Claret
- Department of Chemical and Biomolecular Engineering University of Houston Houston TX 77204 USA
| | - Xiaodong Zou
- Department of Materials and Environmental Chemistry Stockholm University 10691 Stockholm Sweden
| | - Paul J. Dauenhauer
- Department of Chemical Engineering and Materials Science University of Minnesota Minneapolis MN 55455 USA
| | - Xiujie Li
- State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Dalian 116023 China
| | - Jeffrey D. Rimer
- Department of Chemical and Biomolecular Engineering University of Houston Houston TX 77204 USA
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Dai H, Lee C, Liu W, Yang T, Claret J, Zou X, Dauenhauer PJ, Li X, Rimer JD. Enhanced Selectivity and Stability of Finned Ferrierite Catalysts in Butene Isomerization. Angew Chem Int Ed Engl 2021; 61:e202113077. [PMID: 34877748 DOI: 10.1002/anie.202113077] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Indexed: 11/09/2022]
Abstract
Designing zeolite catalysts with improved mass transport properties is crucial for restrictive networks of either one- or two-dimensional pore topologies. Here, we demonstrate the synthesis of finned ferrierite (FER), a commercial zeolite with two-dimensional pores, where protrusions on crystal surfaces behave as pseudo nanoparticles. Catalytic tests of 1-butene isomerization reveal a 3-fold enhancement of catalyst lifetime and an increase of 12 % selectivity to isobutene for finned samples compared to corresponding seeds. Electron tomography was used to confirm the identical crystallographic registry of fins and seeds. Time-resolved titration of Brønsted acid sites confirmed the improved mass transport properties of finned ferrierite compared to conventional analogues. These findings highlight the advantages of introducing fins through facile and tunable post-synthesis modification to impart material properties that are otherwise unattainable by conventional synthesis methods.
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Affiliation(s)
- Heng Dai
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX 77204, USA
| | - Choongsze Lee
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA
| | - Wen Liu
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Dalian, 116023, China
| | - Taimin Yang
- Department of Materials and Environmental Chemistry, Stockholm University, 10691, Stockholm, Sweden
| | - Jakob Claret
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX 77204, USA
| | - Xiaodong Zou
- Department of Materials and Environmental Chemistry, Stockholm University, 10691, Stockholm, Sweden
| | - Paul J Dauenhauer
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA
| | - Xiujie Li
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Dalian, 116023, China
| | - Jeffrey D Rimer
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX 77204, USA
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Le TT, Shilpa K, Lee C, Han S, Weiland C, Bare SR, Dauenhauer PJ, Rimer JD. Core-shell and egg-shell zeolite catalysts for enhanced hydrocarbon processing. J Catal 2021. [DOI: 10.1016/j.jcat.2021.11.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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9
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Developing quantitative synthesis-structure-function relations for framework aluminum arrangement effects in zeolite acid catalysis. J Catal 2021. [DOI: 10.1016/j.jcat.2021.04.027] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Galey MM, Miller MA, Lanuza M, Prabhakar S, Nicholas CP. Understanding the impact of one-dimensional pore containing 10MR and 12MR and aluminium content on MTH reaction pathways: direct synthesis of heteroatom containing UZM-55. Catal Sci Technol 2020. [DOI: 10.1039/c9cy01810g] [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
We directly synthesized one-dimensional zeolite UZM-55 as an aluminosilicate and catalyzed MTH to understand pore structure influence on catalytic properties.
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Affiliation(s)
- Melissa M. Galey
- Exploratory Catalysis and Materials Research
- Honeywell UOP
- Des Plaines
- USA
| | - Mark A. Miller
- Exploratory Catalysis and Materials Research
- Honeywell UOP
- Des Plaines
- USA
| | - Mary Lanuza
- Exploratory Catalysis and Materials Research
- Honeywell UOP
- Des Plaines
- USA
| | - Sesh Prabhakar
- Materials Characterization Research
- Honeywell UOP
- Des Plaines
- USA
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