Review
Chemistry, Multidisciplinary
Yanhua Wang, Chengzheng Tong, Qingling Liu, Rui Han, Caixia Liu
Summary: This review provides an overview of intergrowth zeolites, which possess unique properties compared to single-phase zeolites. The review discusses the structural features, synthesis, and characterization methods of intergrowth zeolites, and highlights their applications in various catalytic areas. The relationship between structure and catalytic activity is also analyzed. The review concludes with a comprehensive discussion on the synthesis, characterization, and catalysis of intergrowth zeolites, as well as a brief outlook on future directions and challenges.
Article
Chemistry, Applied
Zhihong Li, Yuanshuai Liu, Tao Dou, Xiaofeng Li, Chunyu Di, Sheng-Li Chen
Summary: A synthetic strategy for the effective recycling of mother liquors produced from industrial production of SAPO-34 zeolites is reported. By using vapor-phase-transport method, spray-dried mother liquors with added Si, P and Al were converted to crystal seeds, leading to the acquisition of zeolite products with improved porosity and acidity. The topological structures of the zeolites significantly depended on the crystalline phase of the vapor-phase-transport seeds. The as-synthesized zeolites showed enhanced catalytic performance in methanol-to-olefins reactions compared to conventional hydrothermal synthesized zeolites.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Physical
Jingyang Hu, Jianling Zhang, Xiuniang Tan, Xiuyan Cheng, Zhuizhui Su, Lixiong Qian, Mingzhao Xu, Yufei Sha, Yanyue Wang, Yisen Yang, Yunpeng Liu, Guang Mo, Xueqing Xing, Zhonghua Wu
Summary: Developing high-performance metal-organic frameworks (MOFs) for catalysis is important. In this study, mesoporous Cu3-xZnx(BTC)(2) nanocubes were synthesized in a deep eutectic solvent, with the reaction proceeding at room temperature and shorter reaction time compared to conventional solvothermal route. The formation mechanism of the nanocubes in the deep eutectic solvent was investigated, and they exhibited high catalytic activity and reusability.
Article
Materials Science, Multidisciplinary
Benjamin D. Yuhas, Kristy Wilson, Mark A. Miller, Wharton Sinkler, Haibo Yu, John P. S. Mowat
Summary: The properties and pore structure of microporous materials are determined by the composite building units, with the new material AlPO-91 having five distinct cage types, unlike its predecessor AlPO-78. These materials represent an interesting subclass of ABC-6 materials with equal numbers of d6r and s6r subunits, which have important implications for their porosity and potential applications.
ACS MATERIALS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Suresh Siliveri, Sai Siva Kumar Pinnepalli, Deepak Joshi, Suman Chirra, Srinath Goskula, Sripal Reddy Gujjula, Nathan A. Oyler, Venkatathri Narayanan
Summary: Microporous SAPO-35 molecular sieves were successfully synthesized in non-aqueous media using different inorganic promoters, resulting in highly crystalline materials with consistent framework structures. Characterization studies confirmed minor changes in pore size and elemental compositions, while catalytic application studies showed similar efficiency to standard materials.
Article
Chemistry, Applied
Suvdanchimeg Sunderiya, Selengesuren Suragtkhuu, Solongo Purevdorj, Tumentsereg Ochirkhuyag, Munkhjargal Bat-Erdene, Purevlkham Myagmarsereejid, Ashley D. Slattery, Abdulaziz S. R. Bati, Joseph G. Shapter, Dorj Odkhuu, Sarangerel Davaasambuu, Munkhbayar Batmunkh
Summary: Transition metal carbides and nitrides (MXenes) nanosheets have potential applications, but their sensitivity to water and oxygen leads to oxidation/degradation. In this study, the oxidation process of few-layer Ti3C2TX nanosheets in an aqueous solution was systematically tracked, and severely oxidized MXene was found to be a promising candidate for designing efficient catalysts. Black titanium oxide, white Ti (IV) oxide, and disordered carbons were formed as final products. This work enhances the understanding of MXene oxidation and expands its prospects for various applications.
JOURNAL OF ENERGY CHEMISTRY
(2024)
Article
Chemistry, Multidisciplinary
Lei Guo, Weiping Zhu, Aihua Xing, Fei Li, Zhihui Guo
Summary: SAPO-34 molecular sieves with various special morphologies were successfully synthesized using mixed templates and by varying the silicon content in the gel. The acidity and morphology of the synthesized SAPO-34s were found to be affected by the silicon content. For the methanol to olefin reaction, SAPO-34 S-0.3 with suitable acidity and hierarchical structures exhibited higher selectivity to ethylene plus propylene and longer catalyst lifetime.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Engineering, Environmental
Zhichen Shi, Aditya Bhan
Summary: Methanol-to-hydrocarbons catalysis over HZSM-5 at low methanol partial pressure showed a decrease in steady-state ethylene and aromatics selectivity. The addition of CO resulted in an increase in the carbon ratio of ethylene compared to 2-methylbutane and 2-methyl-2-butene, but also decreased catalyst stability and hydrocarbons selectivity. The effects of CO were more significant at higher partial pressures of CO, lower inlet concentrations of methanol, olefins, and aromatics, and with smaller proton density and crystallite size in MFI materials.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Xinyu You, Xin Zhang, Yiru Ye, Hexun Zhou, Shican Jiang, Xue Zhou, Abhishek Dutta Chowdhury
Summary: Introducing sustainability into the design of advanced catalytic materials is crucial for addressing environmental concerns. Synthesizing inorganic zeolite materials from non-traditional sources, such as kaolin, offers several advantages, including improved catalytic performance and reduced resource dependence. This research approach contributes to the transition toward a more sustainable and circular economy.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
Kaiyu Dong, Huizhen Dai, Houkang Pu, Te Zhang, Yingying Wang, Yujia Deng
Summary: Alloying Pt with foreign metal and controlling the geometric morphology of Pt nanomaterials are two strategies to promote the electrocatalytic activity. In this study, PtPd nanowires were successfully synthesized, which exhibited superior catalytic activity in the methanol oxidation reaction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Applied
Li Zhang, Bo Geng, Sen Wang, Pengfei Wang, He Xiao, Jianfeng Jia
Summary: F- was added to regulate the acid property of SAPO-18 molecular sieve and enhance its catalytic performance in methanol-to-olefin reactions. The addition of an appropriate amount of F- during synthesis improved the crystallinity of SAPO-18 and reduced strong acid density and external surface acid content. The H-SAPO-18-I-20-0.0025 molecular sieve exhibited a longer catalytic lifetime (1000 min) and higher selectivity towards light olefins (45.2% propene and 96.1% C2-5 =) than the traditional H-SAPO-18-1-0 sieve in MTO at 400°C.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Xiangkun Wu, Zihao Zhang, Zeyou Pan, Xiaoguo Zhou, Andras Bodi, Patrick Hemberger
Summary: In this study, the experimental detection of methylketene as the precursor of ethylene on HZSM-5 was reported, providing evidence for the computationally predicted ketene-to-ethylene reaction pathway.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Review
Chemistry, Multidisciplinary
Xinqiang Wu, Yingxu Wei, Zhongmin Liu
Summary: The methanol-to-hydrocarbons (MTH) process provides a new route for obtaining basic chemicals without relying on oil resources. The reaction reflects the dynamic assembly process of C-C bonds in zeolite catalysts' confined microenvironment. Advanced in situ spectroscopy and computational chemistry methods have helped capture and understand the details of reactants, intermediates, and products, and model the reaction steps at the molecular and atomic levels. The concept of dynamic catalysis provides insights into complex catalytic mechanisms and structure-activity relationships in MTH chemistry.
ACCOUNTS OF CHEMICAL RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Meiting Wen, Li Ren, Jingyan Zhang, Jingang Jiang, Hao Xu, Yejun Guan, Peng Wu
Summary: The study demonstrates that specially designed amines can guide Si atoms into more favorable T sites, improving the catalytic performance of silicoaluminophosphate zeolites.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Organic
Zheng-Wang Qu, Hui Zhu, Rainer Streubel, Stefan Grimme
Summary: Extensive DFT calculations in this study show that the isomerization of unprotected C-5-position mesoionic N-heterocyclic olefins (mNHOs) can be efficiently catalyzed by weakly protic acidic species, including mNHOs themselves, their Lewis adducts, and polar H2O molecules, leading to the formation of more Lewis-basic mesoionic carbenes (MICs) and enabling catalytic isomerization and H-isotope exchange of mNHOs and their Lewis adducts.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2022)
