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
Xiang Li, Xuerong Zhou, Lin Wang, Jinyin Lv, Shengnan Liu, Roel Prins, Anjie Wang, Qiang Sheng
Summary: The desulfurization of 2-phenylcyclohexanethiol was studied over different catalysts under H2 and Ar atmospheres. It was found that Ni and Co had different promoting effects on the desulfurization pathways under different conditions.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Rufino M. Navarro Yerga, Barbara Pawelec, Noelia Mota, Rafael Huirache-Acuna
Summary: New Ni-Mo-Mo hydrodesulfurization (HDS) catalysts supported by Al2O3-CeO2 materials were synthesized to achieve low sulfur content in gas oil. The addition of CeO2 loading in the support significantly improved the activity and hydrogenation function of the catalyst, leading to efficient conversion of dibenzothiophene (DBT).
Article
Chemistry, Physical
Siphumelele Majodina, Zenixole R. Tshentu, Adeniyi S. Ogunlaja
Summary: The study evaluates the impact of adding chelating ligands to catalysts on HDS activity and finds that adding RhMo on a γ-Al2O3 support can enhance catalytic activity.
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
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
Chemistry, Applied
Idia G. Nascimento, William de R. Locatel, Bruno C. Magalhaes, Leonardo Travalloni, Jose L. Zotin, Monica A. P. da Silva
Summary: This study aimed to estimate the kinetic parameters of DBT HDS reactions, with two power-law models providing good fits to the experimental data with different levels of detail. The estimation of parameters related to biphenyl hydrogenation to cyclohexylbenzene was hindered due to its significance only at conditions with high DBT conversions.
Article
Chemistry, Physical
Shuang Chu, Xiang Li, Roel Prins, Chunhua Wang, Yingya Liu, Anjie Wang, Qiang Sheng
Summary: Ultrasmall Ni2P nanoparticles supported on SiO2 and Al2O3-B2O3 were synthesized using Ni(NO3)2 and H3PO3 as precursors. The introduction of B2O3 to Al2O3 inhibited the formation of AlPO4 during reduction. The Ni-P/SiO2 catalysts with weak Ni2P-support interaction showed high activity, while the Ni-P/AB catalysts with strong Ni2P-support interaction exhibited lower activity.
JOURNAL OF CATALYSIS
(2023)
Article
Engineering, Chemical
Gentil de Souza Guedes Jr, Idia Gigante Nascimento, Mueed Ahmad, Cormac Killeen, J. Anibal Boscoboinik, Jason Trelewicz, Jose Carlos Pinto, Matheus Dorneles de Mello, Monica Antunes Pereira da Silva
Summary: This work evaluated the kinetic parameters of the simultaneous reactions of HDS and HDN using CoMoP/Al2O3 and NiMoP/Al2O3 catalysts. Both power-law and Langmuir-Hinshelwood models provided good fits for the experimental data. The NiMoP catalyst showed higher hydrogenating power and stronger adsorption of nitrogen compounds compared to the CoMoP catalyst. Catalysts with higher hydrogenating power are more capable of performing both HDN and HDS reactions simultaneously.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Energy & Fuels
Pengcheng Wang, Jun Liu, Guo Liu, Peiwen Xu, Xinzhen Feng, Weijie Ji, Yulan Gao, Chak-Tong Au
Summary: By studying the interfacial structures of oxidic CoMoOx/Al2O3 and sulphurated CoMoSx/Al2O3 in the selective hydrodesulfurization of dibenzothiophene, it was found that different structures significantly affected the efficiency of the reaction. The surface MoS2/CoMoS/Co9S8 species on the Al2O3 (1 1 0) facet showed the highest conversion rate of DBT, highlighting the importance of MoS2-Co9S8 and MoS2-CoMoS conjunction and synergism.
Article
Energy & Fuels
Pojawan Aiamsiri, Dusadee Tumnantong, Boonyawan Yoosuk, Chawalit Ngamcharussrivichai, Pattarapan Prasassarakich
Summary: This research investigated the performance of unsupported and γ-Al2O3 supported Ni-Mo catalysts for palm oil deoxygenation to biohydrogenated diesel. It was found that the hydrothermal method for preparing 0.2-NiMoS2 catalyst was efficient, while the H-NiMoS2/γ-Al2O3-0.2 catalyst prepared using a one-step hydrothermal method showed good HDO activity. Both catalysts could be reused for at least three cycles while maintaining good performance.
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
Energy & Fuels
Rupesh Singh, Deepak Kunzru, Sri Sivakumar
Summary: The research demonstrates that NiMoW trimetallic catalysts exhibit higher activity in hydrodesulfurization due to synergistic effect, which involves partial substitution of Mo by W during synthesis, as well as the use of ultrasmall size catalysts.
Article
Chemistry, Multidisciplinary
Ryan M. Claydon, Luis A. Roman-Ramirez, Joseph Wood
Summary: The study shows that the Mo-MMO catalyst exhibits comparable reaction rates to Pd-2%/Al2O3 catalyst and significant advantage in cis-decalin production, offering the opportunity for generating more alkyl naphthenes in subsequent hydrodecyclization reactions. On the other hand, Pd catalysts supported on Al2O3 tend to preferentially produce trans-decalin due to the electronic properties of Pd catalysts influencing octalin intermediate orientations on the catalyst surface.
Article
Chemistry, Applied
Di Zhang, Xin-Mei Liu, Yu-Xiang Liu, Zi-Feng Yan
Summary: The pore structure significantly influences the performance of Ni-Mo/γ-Al2O3 catalyst and the desulfurization pathway of 4,6-dimethyldibenzothiophene. By adjusting the pore size, the reducibility of Mo species and the Ni-Mo-S structure can be modified, resulting in different reaction pathways and efficiencies. The design of deep desulfurization catalysts for environmental protection can be optimized based on these findings.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Energy & Fuels
F. A. Agblevor, H. Wang, S. Beis, K. Christian, A. Slade, O. Hietsoi, D. M. Santosa
Article
Chemistry, Physical
Fan Lin, Yuan Chen, Lu Zhang, Donghai Mei, Libor Kovarik, Berlin Sudduth, Huamin Wang, Feng Gao, Yong Wang
Article
Chemistry, Multidisciplinary
Jordan Klinger, Daniel L. Carpenter, Vicki S. Thompson, Neal Yancey, Rachel M. Emerson, Katherine R. Gaston, Kristin Smith, Michael Thorson, Huamin Wang, Daniel M. Santosa, Igor Kutnyakov
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.
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, Multidisciplinary
Zheng-Hua Li, Huamin Wang, Kimberly A. Magrini, James Edward Lee, Thomas Geeza, Oleg Vitalivich Maltsev, Jacob Pierce Helper
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2020)
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)