Article
Chemistry, Applied
Li Han, Lulu Guo, Shaozong Xue, Zheng Wang, Tianliang Lu, Jun Xu, Yuzhong Zhan, Jianfeng Wang
Summary: In this study, hierarchical porous SAPO-34 zeolite with excellent catalytic properties was successfully prepared using a one-step hydrothermal synthesis method by introducing water-soluble polyacrylamide (PAM) hydrogel into the conventional SAPO-34 synthesis system. Compared to conventional microporous SAPO-34, the hierarchically structured SAPO-34 exhibited significantly longer catalytic lifetime (740 min) and improved selectivity for light olefins up to 87.5% in the MTO reaction.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Z. Liu, Q. Wang, S. Liu, M. Yang, D. Fan, D. Zhu, P. Tian
Summary: The large-scale industrialization of the methanol-to-olefins (MTO) process has led to a significant consumption of MTO catalyst. The conversion of spent MTO catalyst into valuable materials is important for environmental protection and the development of the MTO industry. In this study, the spent MTO catalyst was used as raw material for the synthesis of SAPO-34 and their catalytic applications. Different-sized amines were employed as synthesis templates, and high crystallinity SAPO-34 with varied Si contents could be synthesized using the reactive Si/Al/P sources in the spent MTO catalyst. Low-silica SAPO-34 exhibited good catalytic performance, and SAPO-34-DEA showed excellent catalytic performance in the methanol ammoniation reaction due to its higher acid concentration and larger crystal size.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Chemistry, Inorganic & Nuclear
Wenyan Ma, Yida Zhou, Jiani Zhang, Siyu Zong, Bolun Wang, Jiyang Li
Summary: This study proposes a method to transform waste zeolite catalyst into carbon dots-zeolite composites with controllable luminescence. By adjusting the calcination conditions, the fluorescence behavior of the composites can be tuned. This work provides a novel synthetic route for recycling waste materials.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Applied
Baorong Wang, Peixin Rui, Xinheng Cai, Xianqing Xie, Weilin Liao, Yibin Luo, Xingtian Shu
Summary: This study investigates the co-feeding of methanol from stripper units to enhance the ethylene selectivity in the conventional FCC process. The results show that the use of SAPO-34 catalyst under specific conditions can significantly improve the yield of ethylene and light olefins.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
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
Weili Dai, Landong Li, Chang Wang, Liu Yang, Mingbin Gao, Xue Shao, Guangjun Wu, Naijia Guan, Zhaochao Xu, Mao Ye
Summary: This study presents a strategy of combining precoking and steaming to construct active naphthalenic species within SAPO-34 catalyst, achieving both high olefin selectivity and prolonged catalyst lifetime in methanol-to-olefin conversion. The spatiotemporal distribution and evolution of the naphthalenic species during the precoking and steaming processes were elucidated. This strategy shows promising prospects for commercial SAPO-34 catalyst in the methanol-to-olefin industry.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Shinya Kokuryo, Kazuya Tamura, Koji Miyake, Yoshiaki Uchida, Atsushi Mizusawa, Tadashi Kubo, Norikazu Nishiyama
Summary: Zr-doped SAPO-34 was synthesized to enhance the catalytic activity, highlighting the significance of Lewis acidity. The highly-dispersed Zr species in Zr-doped SAPO-34 contributed to the higher catalytic activity compared to pristine or Zr-loaded SAPO-34, indicating the strong impact of highly-dispersed Zr species on the performance of SAPO-34.
NEW JOURNAL OF CHEMISTRY
(2022)
Review
Chemistry, Multidisciplinary
Wenhe Yu, Xiaowen Wu, Bohao Cheng, Tianyi Tao, Xin Min, Ruiyu Mi, Zhaohui Huang, Minghao Fang, Yangai Liu
Summary: SAPO-34 zeolite is known for its excellent form selection and controllability in the chemical industry, but easily generates carbon deposition leading to deactivation. To improve catalytic performance, reducing crystal size or introducing secondary macropores to form a hierarchical structure is essential.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Applied
D. Zapater, J. Lasobras, J. Soler, J. Herguido, M. Menendez
Summary: The conversion of methanol to light olefins was studied using SAPO-34 molecular sieve as the catalyst. The highest olefin yield was obtained at 500 degrees C with a 1:1 methanol:water molar ratio in the feed.
Article
Chemistry, Applied
Lei Zhao, Ge Yang, Haocheng Hu, Yuhao Sun, Zhuang Ma, Peng Peng, Eng-Poh Ng, Peng Tian, Hailing Guo, Mintova Svetlana
Summary: In this study, nanosheet SAPO-34 zeolite crystals with a diameter of 300 nm and a thickness of 50 nm were successfully synthesized using a new phosphorus source. The roles of pyrophosphate species were elucidated, showing that one P atom participated in framework formation while the other served as a crystallization control agent. The SAPO-34 nanosheets exhibited superior catalytic performance in methanol-to-olefin reaction due to their unique structure.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Biochemical Research Methods
Hossein Roohollahi, Rouein Halladj, Sima Askari
Summary: SAPO-34/AlMCM-41 hierarchical nanocomposite molecular sieve was prepared and studied for catalytic conversion of methanol to light olefins. The composite showed higher methanol conversion and comparable initial selectivity to light olefins, but deactivated faster than pure SAPO-34, possibly due to its smaller mean pore diameter.
COMBINATORIAL CHEMISTRY & HIGH THROUGHPUT SCREENING
(2021)
Article
Chemistry, Applied
Arash Mahdavi Fard, Sima Askari, Ali Afshar Ebrahimi, Amir Heydarinasab
Summary: In this study, SAPO-34 molecular sieve was synthesized using rice husk as the silica source, which achieved a purity of 97%. The sample synthesized with a Si = 0.6 M concentration and hydrothermal synthesis at 200 degrees C for 18 h showed the highest crystallinity and selectivity towards light olefins. Additionally, using methanol/water as feed increased the selectivity of light olefins.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Biochemical Research Methods
Sogand Aghamohammadi, Mohammad Haghighi, Parisa Sadeghpour, Tayebeh Souri
Summary: The study explored the production of light olefins from methanol over SAPO-34 molecular sieves using mono and dual templates. Different templates affected the crystallinity, phase peaks intensity, Si incorporation, and morphology of the final product. The catalyst synthesized with a TEA/morpholine mixture showed the best performance in terms of lifetime and selectivity for light olefins production.
COMBINATORIAL CHEMISTRY & HIGH THROUGHPUT SCREENING
(2021)
Article
Energy & Fuels
Muhammad Sheraz Ahmad, Chin Kui Cheng, Prakash Bhuyar, A. E. Atabani, Arivalagan Pugazhendhi, Nguyen Thuy Lan Chi, Thongthai Witoon, Jun Wei Lim, Joon Ching Juan
Summary: The rising demand for light olefins production due to population growth, expanding transportation network, and rapid industrialization has made methanol-to-olefins conversion the most preferred route, although high selectivity remains a challenge. Molecular sieves have been an active commercial development area for the past two decades, as they efficiently decrease coke deposition, improve mass transport, and enhance catalytic performance in methanol to olefins reaction. SAPO-34 molecular sieves are highly selective for ethylene and propylene synthesis, exhibiting the best performance for the MTO process.
Article
Materials Science, Ceramics
Hanie Karimi, Jafar Towfighi, Sahar Akhgar
Summary: Hierarchical porous zeolites with mesoporosity introduced by PEG showed improved catalytic performance in the MTO reaction, with a direct relation between mesopores and PEG molecular weight affecting diffusion pathways and acidity. The tuned SAPO-34 catalysts demonstrated enhanced stability and selectivity to light olefins, particularly propylene and total butylene, in comparison to their parent and other modified counterparts.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Applied
Haibing Sheng, Haitao Zhang, Hongfang Ma, Weixin Qian, Weiyong Ying
Article
Thermodynamics
Zhixin Lyu, Hongfang Ma, Weixin Qian, Haitao Zhang, Weiyong Ying
JOURNAL OF CHEMICAL THERMODYNAMICS
(2020)
Article
Chemistry, Applied
Haibing Sheng, Weixin Qian, Haitao Zhang, Peng Zhao, Hongfang Ma, Weiyong Ying
MICROPOROUS AND MESOPOROUS MATERIALS
(2020)
Article
Chemistry, Physical
Zhiqiang Xu, Jianwen Li, Yuxuan Huang, Hongfang Ma, Weixin Qian, Haitao Zhang, Weiyong Ying
CATALYSIS COMMUNICATIONS
(2020)
Article
Chemistry, Multidisciplinary
Zhiqiang Xu, Hongfang Ma, Yuxuan Huang, Weixin Qian, Haitao Zhang, Weiyong Ying
Article
Chemistry, Physical
Zhengli Zhang, Yuxuan Huang, Hongfang Ma, Weixin Qian, Haitao Zhang, Weiyong Ying
Summary: The study demonstrates that MOF-derived ZnZrOx nanoparticles, when used as a component of bifunctional catalysts, exhibit enhanced CO conversion and olefins selectivity when combined with SAPO-34.
CATALYSIS COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Yuxuan Huang, Hongfang Ma, Zhiqiang Xu, Weixin Qian, Haitao Zhang, Weiyong Ying
Summary: A ZnCrOx + H-SSZ-13 bifunctional catalyst has been developed with adequate acidic strength, leading to a high percentage of light olefins in hydrocarbons during the STO reaction. The role of H2 and CO in affecting the selectivity towards paraffins was found to be more dominant than traditional hydrogen transfer reactions.
Article
Chemistry, Multidisciplinary
Yang Bai, Yujie Pan, Na An, Haitao Zhang, Chao Wang, Wei Tian, Tao Huang
Summary: This study successfully fabricated supramolecular complexes self-assemblies (SCSAs) by incorporating cinnamaldehyde (CA) and PEG-modified cyclodextrin host units (mPEG-CD-CA) with ferrocene-(phenylboronic acid pinacol ester) conjugates (Fc-BE) based on CD-induced host-guest interactions. After internalization by cancer cells, CA can be released from SCSAs through pH-responsive acetal linkage, elevating the H2O2 level by activating NADPH oxidase. Furthermore, Fc can catalyze the H2O2 to higher cytotoxic hydroxyl radicals (OH), while quinone methide (QM) can be produced and consume the antioxidant GSH. In vitro and in vivo experiments demonstrate that SCSAs can be potential amplified CDT nanoagents.
CHINESE CHEMICAL LETTERS
(2023)
Article
Chemistry, Physical
Yang Bai, Jing Wu, Kun Liu, Xiaoning Wang, Qingqing Shang, Haitao Zhang
Summary: The amplified oxidative stress strategy can enhance the efficacy of chemodynamic therapy (CDT) by increasing H2O2 production and reducing GSH levels in tumor cells. In this study, supramolecular nanovalves (SNs) containing oxidative amplification agents were developed to accelerate and amplify the production of center dot OH and consumption of GSH, thereby enhancing CDT efficacy.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
Yi Yang, Weixin Qian, Haitao Zhang, Zhonghao Han, Hongfang Ma, Qiwen Sun, Weiyong Ying
Summary: FeMnxZr and FeMnxZr2Na catalysts with larger BET surface area and pore volume showed improved FTS activity and selectivity to C-2(=)-C-4(=) due to the promotion of Zr on dispersity of iron particles, dissociative adsorption of CO and formation of active phase chi-Fe5C2. However, excessive Zr addition inhibited CO dissociative adsorption and chi-Fe5C2 formation. The interaction between Fe-ZrO2 also inhibited coke deposition and aggregation of Fe species.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Xian Wu, Weixin Qian, Haitao Zhang, Zhonghao Han, Hewei Zhang, Hongfang Ma, Dianhua Liu, Qiwen Sun, Weiyong Ying
Summary: CeO2 nanorods were used as the support for Fe/CeO2 and Fe/CeO2@xMnO(2) catalysts in high-temperature Fischer-Tropsch synthesis of light olefins. The CeO2 support donated electrons to Fe species, promoting CO dissociation, while the synergistic effect between Mn and Ce improved oxygen mobility on the catalyst surface, enhancing selectivity to light olefins. However, excess Mn hindered contact between CeO2 and Fe species, impacting electron transfer and reducing CO conversion rates. The best hydrocarbon distribution for light olefins was achieved over the Fe/CeO2@0.2MnO(2) catalyst.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Yuxuan Huang, Hongfang Ma, Zhiqiang Xu, Weixin Qian, Haitao Zhang, Weiyong Ying
Summary: SAPO-18 showed stable catalytic performance with high selectivity to light olefins, while SAPO-35 quickly deactivated due to the formation of heavy coke deposits, leading to unsustainable catalytic performance.
Article
Chemistry, Multidisciplinary
Zhonghao Han, Weixin Qian, Hongfang Ma, Haitao Zhang, Qiwen Sun, Weiyong Ying
Article
Chemistry, Physical
Zhiqiang Xu, Jianwen Li, Yuxuan Huang, Hongfang Ma, Weixin Qian, Haitao Zhang, Weiyong Ying
CATALYSIS SCIENCE & TECHNOLOGY
(2019)