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, 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)
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
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
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)
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
D. Zapater, J. Lasobras, J. Soler, J. Herguido, M. Menendez
Summary: Deactivation of SAPO-34 catalyst is a common issue in the methanol to olefins (MTO) process. Adding water along with methanol can reduce deactivation, but not fully avoid it. To address this, a reactor where reaction and regeneration happen simultaneously is proposed, with a comparison between conventional and two zone fluidized bed reactors presented in this work.
Article
Engineering, Chemical
Yu-Ling Zhang, Xue-Gang Li, Wen-De Xiao
Summary: This study investigates the transformation mechanism of C3-C6 olefins on SAPO-34 catalyst without methanol co-feeding. A reaction network is constructed and validated, providing accurate predictions of product distribution.
CHEMICAL ENGINEERING SCIENCE
(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, Physical
Motahare Zare, Mohadese Nazari, Reza Mosayebi Behbahani, Marzieh Hamidzadeh
Summary: The present study investigates the aminothermal synthesis of SAPO-34 using various templates and analyzes the characteristics of the catalysts. Only morpholine leads to the formation of pure SAPO-34, and the crystallization time needs to be regulated to prevent the formation of SAPO-20. The study also compares the impact of reactant addition order and stirring intensity on catalyst characteristics. The aminothermal method reduces crystallization time and enhances silica incorporation, but is recommended for synthesis using polar templates or polar additives.