Article
Chemistry, Physical
Zhi Liu, Guangyan Xu, Lingyou Zeng, Wei Shi, Yingjie Wang, Yanwei Sun, Yunbo Yu, Hong He
Summary: We prepared a PtPd-La1/Al2O3 catalyst with highly dispersed La species and Pt-PdO nanoparticles, showing significantly enhanced hydrothermal and long-term stability under the harsh conditions of simulated natural gas vehicle (NGV) exhaust. PdO nanoparticles can be anchored by highly dispersed La sites through electron transfer, inhibiting the sintering of Pd species during hydrothermal aging. Pt uniformly doped in PdO creates high-efficiency Pt sites and unsaturated Pd sites for water-resistance, further enhancing long-term stability. This work provides the potential to resolve tough challenges related to methane emission control on NGVs.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Nanoscience & Nanotechnology
Mei Zhang, Lin Cui, Qiqi Mao, Ziqiang Wang, Hongjie Yu, You Xu, Xiaonian Li, Liang Wang, Hongjing Wang
Summary: In this study, a self-supported mesoporous Pd film catalyst with superior performance for nitrogen reduction reaction (NRR) was successfully synthesized. It was discovered that the coexistence of metallic Pd and its oxide domains with a phase boundary between them can enhance the NRR performance.
Article
Chemistry, Physical
Sui Wan, Kevin Keller, Patrick Lott, Akash Bhimrao Shirsath, Steffen Tischer, Thomas Haber, Rainer Suntz, Olaf Deutschmann
Summary: Planar laser-induced fluorescence with laser synchronized flow control is used to investigate the dynamics and mass transfer of a NOx storage catalyst. The experiment results are compared with numerical simulations to understand the thermodynamic equilibrium and storage rate of NO oxidation under different conditions.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Chemical
Ashvin L. L. Karemore, Renu Sinha, Parivesh Chugh, Prakash D. D. Vaidya
Summary: In this study, the performance of two Pt-based catalysts in the process of carbon dioxide reforming of methane (CDRM) was investigated. The effects of parameters such as space time, CO2/CH4 ratio, and time-on-stream on the conversion and yield of CH4 and CO2 were analyzed. The kinetics of CDRM were also studied and analyzed using different kinetic models.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Physical
Seo Young Kim, Yeon-Bin Choi, Tae Wook Kang, Jin Ho Kim, Do Yun Kim, Jungho Jae, Byungseo Bae, Sun Woog Kim
Summary: In this study, alpha wt%PdO/16wt%Ce(1,y)SixBiyO2-delta/gamma-Al2O3 (PdO/CS(x)Bi(y)/Al2O3) catalyst was prepared for the methane combustion reaction at low temperatures. The addition of SiO2 to the CeO2 cocatalyst improved the catalyst's surface area and acid-base properties, enhancing its potential as an exhaust catalyst. Furthermore, the incorporation of Bi2O3 into the CeO2-SiO2 co-catalyst enhanced the oxygen storage capacity and oxidation properties of PdO, which exhibits high oxidation capability toward methane. The catalyst with 10wt%PdO/16wt%Ce0.85Si0.08Bi0.07/gamma-Al2O3 showed the highest catalytic activity, achieving a methane conversion rate of 88% at 500 degrees C.
CATALYSIS COMMUNICATIONS
(2023)
Article
Energy & Fuels
Xinyu Yang, Zezhi Chen, Huijuan Gong, Feng Lin, Tingting Zhu, Ziyi Yang
Summary: Using a solid superacid catalyst Pt/SO42-/Al2O3 can realize the deoxygenation of LFG, and it has higher activity and lower reaction temperature compared to Pt/gamma-Al2O3 catalyst. Sulfation increases the number of acid sites on the γ-Al2O3 support and enhances the activity of Pt species. In addition, the Pt/SO42-/Al2O3 catalyst maintains stable activity after multiple tests.
Article
Energy & Fuels
Jie Li, Yan Zhang, Wenpo Shan, Hong He
Summary: A series of mesoporous Pd/Al2O3 and Pd/MgAl2O4 catalysts with different palladium contents (0.5, 1 and 4 wt%) were prepared and used for methane combustion. The 1Pd/MgAl2O4 (1 wt% Pd) catalyst showed highly efficient catalysis for methane combustion below 450 degrees C, with a low apparent activation energy of around 50.1 kJ/mol and good thermal stability. The superior catalytic performance of Pd/MgAl2O4 can be attributed to the strong interaction between the MgAl2O4 spinel and PdO species, which promotes species dispersion and stability. In addition, the catalytic activity of Pd/MgAl2O4 showed a volcano-shaped dependence on the size of Pd particles, indicating the importance of strong metal-support interaction.
Article
Chemistry, Physical
Yeongin Jo, Donghyeon Kim, Tae Wan Kim, Doohoo Yoon, Young-Woong Suh
Summary: The mesoporous Pt-MnOx-Al2O3 (mPtMnA) catalyst prepared by solvent-deficient precipitation (SDP) demonstrates excellent performance in the dehydrogenation of H12-BT. The highly dispersed Pt-MnOx nanoclusters generated by the SDP method contribute to its high efficiency.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Xin Ai, Hongmei Xie, Shengming Chen, Guizhi Zhang, Benjing Xu, Guilin Zhou
Summary: The extensive use of fossil energy leads to the wanton emission of CO2 and serious environmental problems. This paper focuses on the utilization of CO2 resources and the design of a high active CO2 hydrogenation catalyst. Cu/gamma-Al2O3 catalysts were prepared using wet impregnation and grinding methods, and their physicochemical properties were characterized. The results demonstrate the significance of Cu content on the catalyst's performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
A. M. dos Santos, J. C. Sagas, A. L. J. Pereira, F. D. Origo, R. C. Catapan, D. A. Duarte
Summary: This paper discusses the development of Ni-covered alumina catalysts using magnetron sputtering. The study found that catalysts produced by magnetron sputtering have high catalytic activity and exhibit ferromagnetic behavior.
Article
Chemistry, Physical
Kyle Karinshak, Pak Wing Chen, Ru-Fen Liu, Stephen J. Golden, Michael P. Harold
Summary: This study investigates the impacts of feed modulation and catalyst design parameters on the conversion of methane and NOx. The results show that the dual-layer catalyst outperforms the single-layer catalyst in terms of methane conversion. The enhancement in methane conversion is related to its nonmonotonic dependence on oxygen, and the transient activity spike is associated with the presence of water during the feed transition.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Physical
Zhoufeng Bian, Wenqi Zhong, Yang Yu, Zhigang Wang, Bo Jiang, Sibudjing Kawi
Summary: Catalysts of Ni supported on home-made mesoporous alumina exhibited high activity and stability in DRM, with NiAl2O4 spinel structure contributing to improved performance. Control of calcination temperature is crucial for catalyst properties.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Environmental
Xiangyu Ma, Hui Xu, Zhang Liu, Yanfei Liu, Chen Wang, Meiqing Shen, Chun Du, Bin Shan
Summary: This study successfully prepared a high-performance PdNi/Al2O3 catalyst with excellent hydrothermal stability and low-temperature activity. Structural and computational results showed that dual interfaces promoted the activation of methane C-H bonds and suppressed water adsorption and agglomeration of PdO particles.
ACS ES&T ENGINEERING
(2022)
Article
Chemistry, Physical
Nassim Bouchoul, Houcine Touati, Elodie Fourre, Jean-Marc Clacens, Isabelle Batonneau-Gener, Catherine Batiot-Dupeyrat
Summary: Macro-mesoporous alumina calcined at different temperatures showed different catalytic activities in dry reforming of methane under plasma discharge. The alumina with the lowest surface area exhibited the highest activity, while the alumina with the highest number of acid and basic sites promoted reactant transformation. Adsorption of CH4 and CO2 over acid and basic sites at the surface of alumina favored the production of syngas.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Engineering, Chemical
Jonathan Ratcliff, Kyle Karinshak, Michael P. Harold
Summary: This study reports the performance features of catalytic sub-stoichiometric oxidation of methane on a Pt + Pd/Al2O3 washcoated monolith under different feed temperatures and O2/CH4 ratios. The results show the coexistence of steady state multiplicity and different methane conversion rates. The methane conversion rate exhibits two regimes in relation to the O2 feed concentration, with higher conversion at lower concentrations and inhibited conversion at higher concentrations. The overlap of these two regimes is observed at the conversion maximum in the form of a clockwise hysteresis loop. Spatial concentration profiles for the dry feed reveal an upstream oxidation zone and downstream steam reforming zone. The addition of water promotes oxidation and steam reforming while maintaining the multiplicity and nonuniform states. The underlying mechanistic aspects responsible for inhibition, rate multiplicity, and co-existing states are discussed.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Chemistry, Physical
Gengnan Li, Bin Wang, Banghao Chen, Daniel E. Resasco
JOURNAL OF CATALYSIS
(2019)
Article
Chemistry, Physical
Gengnan Li, Shanka Dissanayake, Steven L. Suib, Daniel E. Resasco
APPLIED CATALYSIS B-ENVIRONMENTAL
(2020)
Article
Chemistry, Multidisciplinary
Daniel Santhanaraj, Maria P. Ruiz, Mallik R. Komarneni, Tu Pham, Gengnan Li, Daniel E. Resasco, Jimmy Faria
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2020)
Review
Chemistry, Physical
Gengnan Li, Bin Wang, Daniel E. Resasco
Article
Chemistry, Physical
Xianghui Zhang, Cody B. Cockreham, Esra Yilmaz, Gengnan Li, Nan Li, Su Ha, Liangjie Fu, Jianqi Qi, Hongwu Xu, Di Wu
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2020)
Article
Chemistry, Physical
Gengnan Li, Bin Wang, Daniel E. Resasco
Article
Chemistry, Physical
Gengnan Li, Bin Wang, Daniel E. Resasco
JOURNAL OF CATALYSIS
(2020)
Article
Chemistry, Physical
Gengnan Li, Duong T. Ngo, Yu Yan, Qiaohua Tan, Bin Wang, Daniel E. Resasco
Article
Chemistry, Physical
Gengnan Li, Zheng Zhao, Tong Mou, Qiaohua Tan, Bin Wang, Daniel Resasco
Summary: The study evaluates the effects of different solvents on the hydrogenation reactions catalyzed by Pd/alumina, revealing that the solvent can shift the rate determining step of the reaction by competitive adsorption. The results show that non-polar solvents decrease surface coverage of reactants and intermediates, leading to different hydrogenation rates for different solvents.
JOURNAL OF CATALYSIS
(2021)
Review
Chemistry, Physical
Gengnan Li, Bin Wang, Daniel E. Resasco
Summary: Catalytic reactions involve direct interactions between reactants, intermediates, and products with the catalyst surface. The effects of solvents in liquid-phase catalysis play a crucial role in altering binding and reactivity of surface species. Controlling solvent structures can lead to changes in molecular binding and reactions at solid-liquid interfaces.
SURFACE SCIENCE REPORTS
(2021)
Article
Chemistry, Physical
Gengnan Li, Nebojsa Marinkovic, Bin Wang, Mallikharjuna Rao Komarneni, Daniel E. Resasco
Summary: Precise tuning of the local environment surrounding the active site is crucial for engineering catalytic materials. This study explores a nanoconfined catalytic system in which organic surfactants anchored on metal surfaces not only modify catalytic performance but also regulate solvent distribution at the liquid-solid interface. The combination of catalyst synthesis, spectroscopic characterization, reaction kinetics analysis, and computational techniques provides a quantitative description of a catalyst with a tunable local environment near the active site.
Article
Materials Science, Multidisciplinary
Alexandre C. Foucher, Jennifer D. Lee, Zhen Qi, Gengnan Li, Gaoyuan Ouyang, Jun Cui, Jorge Anibal Boscoboinik, Cynthia M. Friend, Juergen Biener, Eric A. Stach
Summary: The use of nanoporous metals as catalysts has attracted significant interest due to their high surface area and density of undercoordinated sites. However, their long-term stability is limited by thermal coarsening. This study demonstrates that the nanoscale morphology of nanoporous Cu can be regenerated by applying oxidation/reduction cycles at 250 degrees C.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Gengnan Li, Bin Wang, Takeshi Kobayashi, Marek Pruski, Daniel E. Resasco
Summary: Experimental and theoretical studies have shown that water clusters around acid sites can bridge with nearby ketone molecules to promote aldol condensation reactions. However, when the distance between two acid sites exceeds a certain value, the presence of water no longer promotes the reaction and significantly decreases the efficiency of bond polarization of the ketone. This work provides insights into how solvent molecules can bridge isolated active sites to enable cooperative catalysis at the nanoscale.
Article
Chemistry, Physical
Houqian Li, Junming Sun, Gengnan Li, Di Wu, Yong Wang
CATALYSIS SCIENCE & TECHNOLOGY
(2020)
Meeting Abstract
Chemistry, Multidisciplinary
Duong Ngo, Tuong Bui, Gengnan Li, Qiaohua Tan, Bin Wang, Daniel Resasco
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2019)
