Article
Chemistry, Physical
Mi Peng, Zhimin Jia, Zirui Gao, Ming Xu, Danyang Cheng, Meng Wang, Chengyu Li, Linlin Wang, Xiangbin Cai, Zheng Jiang, Hong Jiang, Ning Wang, Dequan Xiao, Hongyang Liu, Ding Ma
Summary: Atomically dispersed Pd catalysts supported on annealed nanodiamond exhibit superior activity and stability in propane direct dehydrogenation, with better resistance to coke formation. The high dispersion of Pd species in the catalyst is well-preserved during the reaction, leading to significantly improved performance compared to cluster/particle catalysts at high-reaction temperatures. This work provides deeper insights into designing highly dispersed metal catalysts with in situ regeneration of active sites in high-temperature catalytic reactions.
Article
Chemistry, Physical
Yihu Dai, Yue Wu, Hua Dai, Xing Gao, Suyang Tian, Jingjing Gu, Xianfeng Yi, Anmin Zheng, Yanhui Yang
Summary: The addition of Si modifier in propane dehydrogenation reactions over Co2+-Al2O3 catalysts enhances catalytic stability by introducing moderate-strength acid sites, leading to lower graphitization degree and higher reactivity of coke species. The interaction of C3H6 with Co catalysts can be affected by Si modification, influencing the coking property and catalytic stability.
JOURNAL OF CATALYSIS
(2021)
Review
Chemistry, Multidisciplinary
Eelco T. C. Vogt, Donglong Fu, Bert M. Weckhuysen
Summary: Hydrocarbon conversion catalysts can suffer from deactivation due to deposition or formation of carbon deposits, which is thermodynamically favored above 350 degrees C. Different mechanisms, such as carbenium-ion based mechanism, metal-induced soft coke formation, radical-mediated mechanism, and fast-growing carbon filament formation, contribute to the deactivation. The deactivation is caused by the blocking of pores and active sites by carbon deposits. Proper catalyst and process design can mitigate the effects of deactivation, and new analytical tools allow for direct observation of coke-type species distribution as a function of catalyst structure and lifetime.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Jose P. Ruelas-Leyva, Luis F. Maldonado-Garcia, Alfonso Talavera-Lopez, Ivan A. Santos-Lopez, Lorenzo A. Picos-Corrales, Carlos E. Santolalla-Vargas, Sergio A. Gomez Torres, Gustavo A. Fuentes
Summary: This study synthesized and evaluated a series of Pt-Sn bimetallic catalysts, finding that bimetallic catalysts were more active than those containing only Pt, and that there were two types of coke deposits on the catalyst surface.
Article
Chemistry, Applied
Yueqi Wu, Jiangping Long, Sheng Wei, Yating Gao, Dan Yang, Yihu Dai, Yanhui Yang
Summary: The propane dehydrogenation (PDH) performance of non-noble metal Co-based catalysts can be improved with modified Ti-ZSM-5 zeolites as supports. The enhanced performance is attributed to the tuned state of active Co species and surface acid property due to Ti species. The developed Co/Ti-ZSM-5 catalysts exhibit high selectivity and regeneration stability in recycling PDH reactions. By decreasing the Si/Ti ratio of Ti-ZSM-5 zeolites, the Co sites at different interfaces can be tailored, leading to structural evolution of Ti and improved dispersion and chemical state of the Co sites. Additionally, the high Si/Ti ratio in Ti-ZSM-5 zeolites reduces surface acidity, facilitating C3H6 desorption and enhancing selectivity and anti-coke stability.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Applied
Chombongkot Sricharoen, Bunjerd Jongsomjit, Joongjai Panpranot, Piyasan Praserthdam
Summary: The study revealed that side reactions such as hydrogenolysis, hydrogenation, deep dehydrogenation, and coke formation were more pronounced on K-PtSn/Al2O3 catalyst, while catalytic cracking occurred more on SnOx/SiO2 due to its higher total acidity. Despite the acid site's capability to promote coke formation, SnOx/SiO2 showed lower coke deposition. Additionally, the lower hydrogen spillover on SnOx/SiO2 compared to K-PtSn/Al2O3 contributed to its distinguished stability in propylene dehydrogenation and coke formation of propadiene.
Article
Chemistry, Applied
Yaoxin Wang, Jiandian Wang, Ping Zheng, Changyong Sun, Junyin Luo, Xiaowei Xie
Summary: The Pt/BN catalyst shows high coke resistance and propylene selectivity due to the absence of acidity on the BN support and the strong metal-support interaction between Pt and BN. The encapsulation of Pt particles by BOx overlayers effectively suppresses side reactions and inhibits Pt sintering, providing a rational design strategy for BN-based catalysts.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Physical
Ines Lezcano-Gonzalez, Peixi Cong, Emma Campbell, Monik Panchal, Miren Agote-Aran, Veronica Celorrio, Qian He, Ramon Oord, Bert M. Weckhuysen, Andrew M. Beale
Summary: Pt/Sn-containing MFI zeolites prepared by one-pot hydrothermal methods exhibit high catalytic activity and selectivity for propane dehydrogenation, but prolonged use leads to deactivation due to increased Pt Sn alloying and carbon build-up.
Review
Chemistry, Physical
Ming-Lei Sun, Zhong-Pan Hu, Hao-Yu Wang, Yu-Jun Suo, Zhong-Yong Yuan
Summary: Propylene, a crucial component for the chemical industry, is facing challenges in its traditional oil-based cracking processes due to changes in the global energy situation. The nonoxidative propane dehydrogenation (PDH) technique has emerged as a promising alternative, offering distinct price advantages. However, the thermally induced deactivation remains a significant issue. This review explores strategies to enhance catalytic stability and recyclability, including active site regulation, metal-support interaction enhancement, and support modification, providing insights into the current status and future prospects of catalyst development.
Article
Engineering, Environmental
Camilla Brencio, Robin Gough, Anouk de Leeuw den Bouter, Alba Arratibel, Luca Di Felice, Fausto Gallucci
Summary: This study aims to investigate the deactivation mechanism of Pd-based membranes in propane dehydrogenation processes. Thermogravimetric analysis (TGA) experiments were conducted to study the adsorption and coking of propylene on the membranes. The results show that monolayer coke is the main cause of membrane deactivation, while multilayer coke has a smaller impact. DS membranes deactivate faster than TL membranes due to a higher number of active sites.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Applied
Nikolaos Nikolopoulos, Luke A. Parker, Maurits W. Vuijk, Bert M. Weckhuysen
Summary: One of the main challenges for the chemical industries is finding new ways to produce lower olefins, such as propylene and ethylene, to satisfy the increase in demand for polymers. The addition of magnesium to zeolites in the MTH process has been studied to enhance the selectivity towards light olefins. Adjusting the location of magnesium in zeolite-based catalyst bodies has shown to have a significant impact on their physicochemical properties and catalytic performance in the MTH reaction.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Multidisciplinary Sciences
Huan Yan, Kun He, Izabela A. Samek, Dian Jing, Macy G. Nanda, Peter C. Stair, Justin M. Notestein
Summary: The study demonstrated that growing In2O3 over Pt/Al2O3 using atomic layer deposition results in a nanostructure that kinetically couples domains through surface hydrogen atom transfer, improving the selective oxidative dehydrogenation of propane. In contrast, other nanostructures, such as Pt on In2O3 or Pt mixed with In2O3, were unable to organize the reactions effectively, resulting in more propane combustion.
Article
Energy & Fuels
Cheng Chen, Roberto Volpe, Xi Jiang
Summary: Surface coking is a major deactivation pattern for metal-based catalysts in biofuel reforming, hindering the commercial use of biomass. Molecular dynamics simulation is used to study the thermal degradation of Ni nanocatalyst induced by surface instability, as well as the catalyst deactivation induced by coke deposition. The study reveals mechanisms behind the effects of temperature, PAH size, and oxygen content on coke adsorption, providing guidance for the design of anti-coking catalysts and catalyst regeneration evaluation.
Article
Engineering, Environmental
Sajjad Rimaz, Luwei Chen, Antonio Monzon, Sibudjing Kawi, Armando Borgna
Summary: The addition of Ca reduced the acid centers of Al2O3 and increased the degree of alloy formation, leading to enhanced propylene selectivity and catalyst stability. The Ca-promoted catalyst showed lower deactivation rate and higher residual activity compared to the non-promoted catalyst, resulting in better performance in terms of activity and selectivity at steady state conditions.
CHEMICAL ENGINEERING JOURNAL
(2021)
Review
Chemistry, Physical
Zan Lian, Chaowei Si, Faheem Jan, ShuaiKe Zhi, Bo Li
Summary: This study critically analyzes the formation of coke on Pt-based catalyst in propane dehydrogenation, covering aspects such as the nature of coke, development of kinetics model, and methods to prevent coke deposition. The focus is on providing insights for the rational design of future Pt catalysts, with discussions on regeneration of deactivated catalyst and new strategies like single atom/site and confined metal cluster approaches. This comprehensive summary serves as a solid foundation for further advancements in Pt catalysts for propane direct dehydrogenation.
Article
Chemistry, Physical
Nguyen Minh Tama, Khanh B. Vu, Van V. Vu, Son Tung Ngo
CHEMICAL PHYSICS LETTERS
(2018)
Article
Energy & Fuels
Fahim Fayaz, Long Giang Bach, Mahadi B. Bahari, Trinh Duy Nguyen, Khanh B. Vu, Ramesh Kanthasamy, Chanatip Samart, Chinh Nguyen-Huy, Dai-Viet N. Vo
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2019)
Article
Biochemistry & Molecular Biology
Mohit Chawla, Yury Minenkoy, Khanh B. Vu, Romina Oliva, Luigi Cavallo
Article
Chemistry, Physical
Khanh B. Vu, Long Giang Bach, Thuan Van Tran, Nguyen Thi Thuong, Ha N. Giang, Quynh Thi Phuong Bui, Son Tung Ngo
CHEMICAL PHYSICS LETTERS
(2019)
Review
Engineering, Chemical
Thanh Khoa Phung, Thong Le Minh Pham, Anh-Nga T. Nguyen, Khanh B. Vu, Ha Ngoc Giang, Tuan-Anh Nguyen, Thanh Cong Huynh, Hong Duc Pham
CHEMICAL ENGINEERING & TECHNOLOGY
(2020)
Article
Chemistry, Multidisciplinary
Son Tung Ngo, Trung Hai Nguyen, Nguyen Thanh Tung, Pham Cam Nam, Khanh B. Vu, Van V. Vu
JOURNAL OF COMPUTATIONAL CHEMISTRY
(2020)
Article
Biochemical Research Methods
Ngo Thi Lan, Khanh B. Vu, Minh Khue Dao Ngoc, Phuong-Thao Tran, Dinh Minh Hiep, Nguyen Thanh Tung, Son Tung Ngo
JOURNAL OF MOLECULAR GRAPHICS & MODELLING
(2019)
Article
Chemistry, Physical
Son Tung Ngo, Han N. Phan, Chinh N. Le, Nhung C. T. Ngo, Khanh Bao Vu, Nguyen Thanh Tung, Cuong X. Luu, Van V. Vu
JOURNAL OF PHYSICAL CHEMISTRY B
(2020)
Article
Chemistry, Physical
Khanh B. Vu, Truong Le Phuc Nhi, Van V. Vu, Son Tung Ngo
Article
Chemistry, Physical
Ha N. Giang, Truyen X. Nguyen, Tien V. Huynh, Lam H. Tran, Hoa N. Nguyen, Khanh B. Vu, Van V. Vu
SURFACES AND INTERFACES
(2020)
Article
Chemistry, Physical
Vy Anh Tran, Khanh B. Vu, Thu-Thao Thi Vo, Van Thuan Le, Ha Huu Do, Long Giang Bach, Sang-Wha Lee
Summary: The study demonstrated that ZIF-8 can effectively adsorb Rhodamine B, with the adsorption rate increased under light irradiation. Mechanisms were elucidated through fluorescence spectroscopy, and DFT calculations revealed that pi-pi stacking and electrostatic interactions are key factors for Rh.B adsorption on ZIF-8.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Minh Quan Pham, Khanh B. Vu, T. Ngoc Han Pham, Le Thi Thuy Huong, Linh Hoang Tran, Nguyen Thanh Tung, Van V. Vu, Trung Hai Nguyen, Son Tung Ngo
Article
Chemistry, Multidisciplinary
Trinh Duy Nguyen, Quynh Thi Phuong Bui, Tien Bao Le, T. M. Altahtamouni, Khanh Bao Vu, Dai-Viet N. Vo, Nhan Thi Hong Le, Tuan Duy Luu, Seong Soo Hong, Kwon Taek Lim
Article
Chemistry, Multidisciplinary
Son Tung Ngo, Khanh B. Vu, Le Minh Bui, Van V. Vu
Article
Chemistry, Multidisciplinary
Son Tung Ngo, Huong Thi Thu Phung, Khanh B. Vu, Van V. Vu
