Article
Chemistry, Multidisciplinary
Yanzeng Dong, Xiaohang Yu, Zhiheng Wang, Xin Li, Yanyan Liu, Ruiyao Gao, Songdong Yao
Summary: The effects of HY addition on the NiMoS active phase in NiMo(NH3) impregnated NiMo/Al2O3-HY catalyst and its role in 4,6-dimethyl-dibenzothiophene hydrodesulfurization were investigated. The results demonstrate that HY can enhance the HDS reaction by altering the morphology of NiMoS nanoclusters, even without involving the isomerization of 4,6-DMDBT. In the absence of strong acid sites, the turnover frequency (TOF) of the NiMo/Al2O3 catalyst was still improved by 90%.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Physical
Xuerong Zhou, Xiang Li, Roel Prins, Jinyin Lv, Anjie Wang, Qiang Sheng
Summary: CoP and Co2P were prepared by temperature-programmed reduction, with CoP exhibiting higher activity and nitrogen tolerance, making it a promising HDS catalyst. The HDS reactions followed pseudo-first-order kinetics for CoP and pseudo-zero-order kinetics for Co2P. The reaction network and mechanisms of cleavage of different bonds in DBT and its intermediates were discussed based on product distributions.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Ke Yu, Weimin Kong, Zhen Zhao, Aijun Duan, Lian Kong, Xilong Wang
Summary: Mesoporous yolk-shell silica spheres with different shell thicknesses and yolk sizes were synthesized and used as catalyst supports for hydrodesulfurization reactions. The results showed that the shell thickness and yolk size significantly affect the catalytic activity, with the NiMo/Al-Y30S13 catalyst exhibiting the highest activity. Additionally, the mechanisms of DBT and 4,6-DMDBT HDS over NiMo/Al-YxSy materials were proposed.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Multidisciplinary
Abdulkadir Tanimu, Saheed A. Ganiyu, Ivan Kozhevnikov, Khalid Alhooshani
Summary: The sulfidation of NiMo catalyst by thermal decomposition of support surface-bound thiols to generate H2S is a clean and effective method for catalyst activation. The loading of thiol groups affects the formation and dispersion of MoS2 active phase on the support, and the interaction between thiol groups and Mo metal enhances metal dispersion on the thiol-containing support.
ARABIAN JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Physical
L. Kaluza, R. Palcheva, K. Jiratova, G. Tyuliev, D. Gulkova, L. Dimitrov, G. Avdeev
Summary: Dispersed NiMo sulfide catalysts were successfully synthesized using TGA as a sulfiding agent in hydrothermal synthesis. Characterization and activity tests revealed that TGA increased the catalyst's surface area and redispersed active sites, thereby improving the catalyst's hydrodesulfurization activity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Jixing Liu, Jingyi Zhu, Jie Zhu, Jundong Xu, Hui Liu, Mingqing Hua, Huifang Cheng, Huaming Li, Jian Liu, Wenshuai Zhu, Hongbing Ji
Summary: A hierarchical NiMo/Al2O3 catalyst was successfully fabricated using a 3D printing strategy, which significantly improved the hydrodesulfurization activity in the petrochemical industry.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Energy & Fuels
Jin-Lin Mei, Yu Shi, Cheng-Kun Xiao, Ao-Cheng Wang, Ai-Jun Duan, Xi-Long Wang
Summary: Hierarchically porous Beta/SBA-16 (BS) composite materials were synthesized through a two-step in-situ assembly hydrothermal crystallization method, and NiMo catalysts supported on BS with different silica-alumina ratios were prepared. The catalysts exhibited high hydrodesulfurization activity due to the synergistic effects of various factors.
Article
Chemistry, Physical
Ramesh Kumar Chowdari, Jorge Noe de Leon, Segio Fuentes-Moyado
Summary: The low-temperature and template-free synthesis method was developed to prepare MoS2 nanotubes by sulfidation of bulk NiMo oxide. The in-situ sulfided catalyst showed outstanding activity in the hydrodesulfurization of dibenzothiophene (DBT), significantly increasing the initial reaction rate. Mathematical expression (RKC equation) was derived to correlate the size of the regular hexagonal MoS2 nanoparticles with its activity.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Applied
Qiang Wei, Wenbin Huang, Xiaodong Liu, Anqi Li, Pengfei Zhang, Zhusong Xu, Zhiqing Yu, Xiaohan Wang, Haoran Liu, Yasong Zhou
Summary: A series of Re modified NiMo/Al2O3 hydrodesulfurization (HDS) catalysts with different contents of Re2O7 were synthesized using stepwise impregnation and co-impregnation methods. The effects of Re modification and impregnation methods on the catalysts' physical-chemical properties were characterized. The results revealed that Re modification improved the crystal morphologies, pore structures, and acid sites of the catalysts. Furthermore, the HDS evaluation showed that Re modification effectively enhanced the conversions, route selectivity, and even selectivity towards 3,3'-DMCHB of 4,6DMDBT, with the stepwise impregnation method exhibiting a more significant effect compared to co-impregnation.
Article
Crystallography
Radostina Palcheva, Ludek Kaluza, Tanya Petrova, Lubomir Dimitrov, Daniela Karashanova, Georgi Tyuliev, Kvetuse Jiratova
Summary: In this study, tri-metallic NiMoW catalysts were prepared using sol-gel and hydrothermal methods, and the hydrodesulfurization (HDS) of thiophene and 4,6-dimethyldibenzothiophene (4,6-DMDBT) was investigated at different hydrogen pressures. The NiMoW/Al-HYDT catalyst exhibited the highest activity, with a pore size of 7.5 nm, while the sol-gel alumina catalyst (NiMoW/Al) had a pore size of only 4.8 nm.
Article
Energy & Fuels
Ji-Xing Liu, Xiang-Qi Liu, Ri-Xin Yan, Ling-Feng Jia, Hui-Fang Cheng, Hui Liu, Yan Huang, Ming-Qing Hua, Hua-Ming Li, Wen-Shuai Zhu
Summary: In this study, a mesoporous LaAlOx catalyst was designed and constructed through a solvent evaporation-induced self-assembly method. The structure and physicochemical properties of the NiMo supported catalyst were characterized, and its catalytic activity for hydrodesulfurization (HDS) was investigated. The incorporation of La was found to significantly enhance the generation of Type II NiMoS phase, leading to improved HDS performance by promoting sulfidation and modifying the morphology of Ni promoted MoS2 slabs. This finding contributes to the understanding of structure-activity relationships in ultra-deep desulfurization and inspires the development of highly-efficient HDS catalysts in the future.
Article
Engineering, Chemical
Jesus Andres Tavizon Pozos, Gerardo Chavez Esquivel, Ignacio Cervantes Arista, Jose Antonio de los Reyes Heredia, Victor Alejandro Suarez Toriello
Summary: The study found that NiMo/TiO2-ZrO2 exhibited higher activity in the co-processing reaction of phenol and DBT compared to NiMo/Al2O3-ZrO2, indicating more active sites and lower competition. Both catalysts showed similar functionalities, but the competition levels varied due to the availability of the highly active NiMoS phase.
INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING
(2022)
Article
Energy & Fuels
Yuwadee Plaola, Wanwipa Leangsiri, Kanokthip Pongsiriyakul, Worapon Kiatkittipong, Atthapon Srifa, Jun Wei Lim, Prasert Reubroycharoen, Kunlanan Kiatkittipong, Apiluck Eiad-ua, Suttichai Assabumrungrat
Summary: This study investigated the catalytic activity and stability of Ni-MoS2 supported on different catalyst supports for the deoxygenation of different feedstocks. The results showed that the catalytic performance was influenced by both the purity of the feedstock and the characteristics of the catalyst supports. NiMo/γ-Al2O3 exhibited a high resistance to impure feedstock and excellent stability.
Article
Engineering, Chemical
Zhentao Chen, Yaxin Liu, Jian Chen, Yang Zhao, Tao Jiang, Fangyu Zhao, Jiahuan Yu, Haoxuan Yang, Fan Yang, Chunming Xu
Summary: In this study, a series of CoMo/NDC@alumina catalysts were synthesized, and the optimal catalyst with 25% 1,10-phenanthroline additive was determined through property characterization and HDS active test. The CoMoS active phase and sulfidation degree of the optimal catalyst were improved compared to CoMo/gamma-Al2O3.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Applied
T. A. Zepeda, R. M. Navarro, R. Huirache-Acuna, P. J. Vazquez-Salas, G. Alonso-Nunez, P. Sanchez-Lopez, B. Pawelec
Summary: The addition of phosphorus to the support (NM-P1.1) decreased the inhibition of HDO reaction by DBT co-adsorption on the active sites. The most active NM-P1.1 catalyst favored the formation of a less susceptible to coke formation product (phenol).
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Agricultural Engineering
Aimee L. Church, Michael Z. Hu, Suh-Jane Lee, Huamin Wang, Jian Liu
BIOMASS & BIOENERGY
(2020)
Article
Chemistry, Multidisciplinary
Daniel M. Santosa, Cheng Zhu, Foster Agblevor, Balakrishna Maddi, Benjamin Q. Roberts, Igor Kutnyakov, Suh-Jane Lee, Huamin Wang
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2020)
Article
Chemistry, Multidisciplinary
Manish Shetty, Huamin Wang, Feng Chen, Nicholas Jaegers, Yue Liu, Donald M. Camaioni, Oliver Y. Gutierrez, Johannes A. Lercher
Summary: The dehydration rates of alkanols catalyzed by hydronium ions are enhanced by the steric confinements of zeolite pores and intraporous intermolecular interactions. Different zeolite structures lead to varying activation enthalpies for alkanol dehydration, affecting the overall reaction rate.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Applied
Huamin Wang, Pimphan A. Meyer, Daniel M. Santosa, Cheng Zhu, Mariefel Olarte, Susanne B. Jones, Alan H. Zacher
Summary: Co-processing residue with stabilized bio-oil in a hydrotreater can convert a significant amount of residue to lighter products without affecting bio-oil conversion rate, potentially due to synergy between hydrotreating and hydrocracking reactions. Elimination of a separate hydrocracker and recycling of residue to the hydrotreating reactor can lead to a 6% reduction in conversion cost, with 57% of the cost reduction attributed to capital equipment elimination and 43% to lower operating costs.
Review
Chemistry, Multidisciplinary
Sneha A. Akhade, Nirala Singh, Oliver Y. Gutierrez, Juan Lopez-Ruiz, Huamin Wang, Jamie D. Holladay, Yue Liu, Abhijeet Karkamkar, Robert S. Weber, Asanga B. Padmaperuma, Mal-Soon Lee, Greg A. Whyatt, Michael Elliott, Johnathan E. Holladay, Jonathan L. Male, Johannes A. Lercher, Roger Rousseau, Vassiliki-Alexandra Glezakou
Article
Energy & Fuels
Zheng-Hua Li, Kimberly Magrini-Bair, Huamin Wang, Oleg V. Maltsev, Thomas J. Geeza, Claudia I. Mora, James E. Lee
Article
Chemistry, Physical
Fan Lin, Vanessa Lebarbier Dagle, Austin D. Winkelman, Mark Engelhard, Libor Kovarik, Yilin Wang, Yong Wang, Robert Dagle, Huamin Wang
Summary: Ag-ZrO2/SBA-16 has been found to efficiently catalyze the conversion of ethanol to butene, but it deactivates over time due to coke deposition, Ag particle sintering, and Ag oxidation state change.
Article
Chemistry, Physical
Yiqing Wu, Feng Gao, Huamin Wang, Libor Kovarik, Berlin Sudduth, Yong Wang
Summary: This study investigates the surface acid-base properties of anatase TiO2 nanomaterials with {101} and {001} facets via methanol titrations. It was found that adsorption and desorption of methanol differ significantly between TiO2(101) and TiO2(001), with surface defects playing an important role in the reaction process.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Pradeep Kumar Gurunathan, Difan Zhang, Vassiliki-Alexandra Glezakou, Roger Rousseau, Huamin Wang, Aimee Lu Church, William Beatrez, Michael Z. Hu, Suh-Jane Lee
Summary: This study conducted experiments to select suitable sorbent and resin systems for treating a surrogate biocrude containing nitrogenous compounds. The results suggest that the Amberlyst resin is an efficient candidate for removing nitrogen-containing compounds, such as pyridine, due to favorable interactions. Computational studies provide insights into the selective extraction of nitrogenous compounds by the identified resin.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Physical
Fan Lin, Yubing Lu, Kinga A. Unocic, Susan E. Habas, Michael B. Griffin, Joshua A. Schaidle, Harry M. Meyer, Yong Wang, Huamin Wang
Summary: The study provides a deep understanding of the impact of K on a bifunctional Pt/TiO2 catalyst, showing that at low K loadings, K preferentially poisons strong Lewis acid sites, significantly affecting acid-catalyzed alcohol dehydration, but less so acetone condensation. At high K loadings, K accumulates on the Pt-TiO2 interfacial area, poisoning active sites for HDO and CO oxidation reactions. It was found that the poisoning of the Pt/TiO2 catalyst by K is reversible, and water washing can successfully remove the accumulated K and recover the catalyst activities.
Article
Energy & Fuels
Cheng Zhu, Oliver Y. Gutierrez, Daniel M. Santosa, Igor Kutnyakov, Roland Weindl, Hui Shi, Huamin Wang
Summary: The coprocessing of biocrudes with petroleum streams has potential for renewable fuel production, but can cause catalyst deactivation. This study investigated the deactivation modes of a hydrotreating catalyst used for coprocessing biocrude with diesel. It was found that catalyst deactivation was mainly attributed to fouling by carbonaceous species and metal contaminants from biocrudes.
Article
Energy & Fuels
Daniel M. Santosa, Igor Kutnyakov, Matthew Flake, Huamin Wang
Summary: Fast pyrolysis and catalytic fast pyrolysis are promising methods for converting lignocellulosic biomass into liquid bio-oils. Coprocessing these bio-oils with petroleum feedstocks reduces capital expenditure and enables fast adoption of the technologies and biofuels.
Article
Chemistry, Physical
Fan Lin, Mengze Xu, Karthikeyan K. Ramasamy, Zhenglong Li, Jordan Lee Klinger, Joshua A. Schaidle, Huamin Wang
Summary: The article discusses the challenges faced by biomass conversion technologies, specifically in terms of catalyst deactivation and mitigation. It highlights the unique properties of biomass-derived feedstocks that cause catalyst deactivation and provides information on potential mitigation approaches to guide the design of robust catalysts and processes for biomass conversion.
Article
Chemistry, Multidisciplinary
Fan Lin, Wenda Hu, Nicholas R. Jaegers, Feng Gao, Jian Zhi Hu, Huamin Wang, Yong Wang
Summary: The effects of water on the carboxylic acid ketonization reaction over solid Lewis-acid catalysts were investigated using various analytical techniques. The presence of water vapor in the feed gas was found to decrease the reaction rate by increasing the activation barrier of acetic acid adsorption on anatase TiO2 catalyst. Water was found to associate with the adsorbed intermediates on the catalyst surface and alter their reactivity for the ketonization reaction. The presence of water vapor also affected the species present on the catalyst surface and led to lower ketonization activity.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Fan Lin, Huamin Wang, Yuntao Zhao, Jia Fu, Donghai Mei, Nicholas R. Jaegers, Feng Gao, Yong Wang
Summary: In this study, two catalysts with high surface areas and clean, dominant facets were synthesized to investigate the vapor phase acetone aldol condensation. The {001} facet showed higher activity than the {101} facet, likely due to weaker Lewis acid and Bronsted base strengths favoring a more exothermic C-C coupling step. The study provides insights into the reaction mechanisms, kinetics, and structure-function relationships on transition metal oxide catalysts.
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)