Article
Chemistry, Applied
Xinyu Li, Jose Andres Hernandez Gaitan, Shinya Kokuryo, Tomoka Sumi, Haruna Kitamura, Koji Miyake, Yoshiaki Uchida, Norikazu Nishiyama
Summary: Hierarchical zeolites with mesopores only on external surfaces were synthesized via an alkaline treatment for organic structure-directing agents (OSDA)-occluded zeolites. These zeolites exhibited higher catalytic activity and improved mass transfer due to the presence of mesopores on external surfaces. They also showed higher hydrothermal stability compared to conventional hierarchical zeolites.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Applied
Maria Pilar Cumplido, Maria Jose Diaz-Cabanas
Summary: ITQ-34 zeolite is a promising catalyst with a three-dimensional mesoporous structure for FCC process. This study successfully synthesized aluminum-rich ITQ-34 zeolite, addressing the issues of low germanium content and blockage of channels by phosphate compounds. The aluminum ITQ-34 zeolite exhibits excellent catalytic performance in propylene production.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Applied
Ghasem Dashtpeyma, Seyed Reza Shabanian, Javad Ahmadpour, Maryam Nikzad
Summary: The microporous structure of Y zeolite strongly affects the function of adsorption desulphurization. This study aims to enhance the adsorption desulphurization performance of a novel bimetal Y zeolite with a hierarchically structured mesoporous sample. The results show that meso-NiCe significantly increases the adsorption capacity.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Engineering, Chemical
Peng Dong, Jinyu Zhang, Tiesen Li, Chan Wang, Jingdong Xu, Tinghai Wang, Yuanyuan Yue, Lilong Jiang, Xiaojun Bao
Summary: This paper describes a sustainable defect-engineering strategy for dealumination of Y zeolite. The strategy involves the green synthesis of Y zeolite with incorporated Fe atoms using Fe-containing perlite and subsequent preparation of ultra-stable Y (USY) zeolite through efficient steaming dealumination. The resulting USY zeolite exhibits excellent (hydro)thermal stability, pore structure, acid property, and shows outstanding catalytic performance.
Article
Environmental Sciences
Qi Shao, Hao Dong, Jian Zhang, Bowen Xu, Yuhao Wu, Chao Long
Summary: This study utilized a combination method of steam and nitric acid to control the dealumination of Y zeolite, and successfully loaded manganese oxide on the dealumination Y zeolite, achieving better catalytic effect. Under low humidity conditions, using a catalyst with mild dealumination could result in toluene degradation efficiency above 94%, but introducing more water vapor inhibited the degradation of toluene.
Article
Chemistry, Physical
Sancler C. Vasconcelos, Luiz F. C. Pinhel, Vinicius G. C. Madriaga, Vinicius Rossa, Leyliane G. S. Batinga, Domingos S. A. Silva, Rodrigo D. dos Santos, Andre V. H. Soares, Ernesto A. Urquieta-Gonzalez, Fabio Barboza Passos, Rajender S. Varma, Thiago M. Lima
Summary: This study presents the synthesis of hierarchical beta and mordenite zeolites for the conversion of furfural into isopropyl levulinate. Beta zeolite treated with an alkaline solution exhibited larger mesopores and a higher Lewis/Bronsted ratio, resulting in improved diffusion and higher conversion and selectivity.
Article
Chemistry, Physical
Guangyu Zhao, Penghui Yan, Kerryn Procter, Adesoji Adesina, Yonggang Jin, Eric Kennedy, Michael Stockenhuber
Summary: The effect of desilication on the physic-chemical properties of ferrierite zeolite was investigated. The study found that desilication led to changes in the textural properties of the zeolite, resulting in an increase in mesopore area and a greater concentration of terminal Si-OH groups. The catalytic activity for the conversion of methane was also studied, and it was found that Fe-FER catalysts prepared with a moderately alkaline solution showed the highest yield of methanol, dimethyl ether, and formaldehyde.
JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Physical
Eliana Carmo de Souza, Marcelo Maciel Pereira, Yiu Lau Lam, Edisson Morgado Jr, Luiz Silvino Chinelatto Jr
Summary: The use of AlPO4 as an active matrix has been shown to improve the performance of fluid catalytic cracking catalysts by increasing selectivity to cracking products, enhancing hydrothermal stability, and preserving more acid sites.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Chemistry, Applied
Wenhao Cui, Dali Zhu, Juan Tan, Nan Chen, Dong Fan, Juan Wang, Jingfeng Han, Linying Wang, Peng Tian, Zhongmin Liu
Summary: Mesoporous high-silica zeolite Y, with improved accessibility of acid sites and mass transport properties, is a highly desired catalytic material for various industries. Its direct synthesis, named MSY, exhibits excellent catalytic cracking performance and thermal stability. The MSY-based catalyst demonstrates enhanced conversion and gasoline yield in cracking reactions compared to commercial ultra-stable Y and mesoporogen-free counterparts.
CHINESE JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Physical
Zhiguo Zhu, Haikuo Ma, Weiping Liao, Pengpeng Tang, Kaixuan Yang, Ting Su, Wanzhong Ren, Hongying Lu
Summary: This study constructed tri-coordinated Al with Lewis acidity in ultra-stable Y zeolite by precisely tailoring acid-treatment time, demonstrating these Lewis acid sites as the catalytic active sites for oxidative desulfurization reactions. Systematic investigation was conducted to reveal the physicochemical properties and evolution mechanism of dealumination-derived samples, confirming the most possible tri-coordinated Al micro-structure with Lewis acidity.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Applied
Qingjing Niu, Lisha Wei, Ling Zhang, Zhengxing Qin, Kun Hao, Caixia Hu, Xiaodong Wen, Baojian Shen, Zhichao Tao, Yong Yang, Yongwang Li
Summary: In this study, IM-5 zeolite with a SiO2/Al2O3 ratio of 49-116 was successfully obtained by HNO3 treatment. The stepwise dealumination behavior of IM-5 during the acid treatment process was discovered, and the extra-framework Si compensated for the defects in the IM-5 framework. The dealuminated IM-5 retained high crystallinity and micropore volume, and showed improved catalytic performance.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Physical
Min-Ryeong Kim, Suhan Kim
Summary: Efficient Pt-supported zeolite catalysts with tunable mesopore structures are fabricated and shown to exhibit improved performance in VOC oxidation.
Article
Energy & Fuels
Shuo Guo, Shanqing Yu, Huiping Tian, Zhijian Da
Summary: This study investigates the effects of three different binders on REUSY zeolite. Alumina sol notably damages the framework of zeolites by blocking the pore channels and removing framework Al. Silica sol enhances the structural stability and increases the number of Bronsted acid sites in zeolites, leading to better hydrothermal stability and higher micro-reaction activity. The influence of pseudo boehmite colloidal sol on zeolites falls between that of alumina sol and silica sol.
Review
Chemistry, Inorganic & Nuclear
Lei Tan, Nianming Jiao, Xinrui Bai, Hongyan Wang, Jun Wang, Hui Wang, Xiangping Zhang
Summary: Zeolites are commonly used in petrochemical processes and refineries. However, the narrow microporous channels limit the diffusion of reactants and products. Chemical etching techniques, such as exposure to acids, alkalis, and neutral etchants, can introduce mesopores and macropores to enhance mass transfer and accessibility. This review summarizes and evaluates the chemical etching methods and their relevance to various catalytic reactions.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Xinling Xv, Song Ye, Ling Pan, Peixuan Lin, Huazhen Liao, Deping Wang
Summary: In this study, the emission properties of Ag CLs confined inside zeolites were controlled by modifying the zeolite framework. It was found that desilicated zeolites showed red-shifted emission while dealuminated zeolites showed blue-shifted emission, enabling tunable emission in the range of 482-528 nm.
Article
Chemistry, Physical
Yifan Sun, Ye Lv, Wei Li, Jinli Zhang, Yan Fu
Summary: In this study, PtRu electrocatalysts were fabricated on carbon paper via cyclic electrodeposition for the electrocatalytic hydrogenation (ECH) of phenol. The Pt3Ru3 catalyst exhibited excellent activity and stability for the conversion of phenol to cyclohexanol at ambient temperature and various current densities. The in situ Raman spectroscopy and kinetic study revealed the hydrogenation mechanism of phenol over Pt3Ru3 in acidic electrolyte, providing an effective electrochemical strategy for the facile construction of durable electrode materials and efficient phenol hydrogenation.
JOURNAL OF CATALYSIS
(2024)
Article
Chemistry, Physical
Amir Shahzad, Khezina Rafiq, Muhammad Zeeshan Abid, Naseem Ahmad Khan, Syed Shoaib Ahmad Shah, Raed H. Althomali, Abdul Rauf, Ejaz Hussain
Summary: Photocatalytic hydrogen production through water splitting is an effective method for meeting future energy demands. In this study, researchers synthesized a 1 % Ag2S/Cu2S co-doped CdZnS catalyst and found that it can produce hydrogen at a higher rate. The co-doping of Ag2S and Cu2S in the CdZnS catalyst showed a synergistic effect, with Ag2S promoting oxidation reactions and Cu2S promoting reduction reactions.
JOURNAL OF CATALYSIS
(2024)
