Article
Chemistry, Applied
Paola Riani, Gabriella Garbarino, Tullio Cavattoni, Guido Busca
Summary: Two Co/SiO2 catalysts exhibit different catalytic behaviors in CO2 methanation and reverse water gas shift reactions, with carbon nanotubes produced not affecting the catalyst activity.
Article
Chemistry, Physical
Naiara Garcia-Gomez, Jose Valecillos, Aingeru Remiro, Beatriz Valle, Javier Bilbao, Ana G. Gayubo
Summary: The study investigates the deactivation mechanism of a NiAl2O4 spinel derived catalyst in steam reforming of bio-oil, revealing the roles of Ni and alumina sites in this mechanism. It shows that under specific reaction conditions, high initial hydrogen yield can be achieved, but increasing temperature may lead to coke formation and rapid catalyst deactivation.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Energy & Fuels
Naiara Garcia-Gomez, Jose Valecillos, Beatriz Valle, Aingeru Remiro, Javier Bilbao, Ana G. Gayubo
Summary: This study investigates the impact of temperature and bio-oil composition on the stability of a catalyst, and finds that the catalyst deactivates rapidly when the external surface is blocked by turbostratic carbon. Removing phenolic compounds from the bio-oil slows down the formation of turbostratic carbon and improves catalyst stability.
Article
Energy & Fuels
Jose Valecillos, Sergio Iglesias-Vazquez, Leire Landa, Aingeru Remiro, Javier Bilbao, Ana G. Gayubo
Summary: This study demonstrates the satisfactory performance of a Ni/Al2O3 catalyst derived from NiAl2O4 spinel in ethanol steam reforming. The reaction for H-2 formation in this system primarily occurs through two paired routes activated by metal and acid sites, limited by selective catalyst deactivation. At 500 degrees C, the main route involves ethanol dehydration on acid sites followed by ethylene decomposition on the Ni-Al2O3 interface, while at 600 degrees C, the gasification reaction of carbon species reduces the formation of carbon material.
Article
Chemistry, Physical
Sergio Iglesias-Vazquez, Jose Valecillos, Aingeru Remiro, Javier Bilbao, Ana Guadalupe Gayubo
Summary: The regeneration of NiAl2O4 spinel derived catalysts for ethanol steam reforming is challenging due to irreversible deactivation caused by Ni volatilization and catalyst particle fragmentation. The Al2O3 content in the catalyst influences the irreversible deactivation, which can be controlled by reducing the catalyst at 700-750 degrees C.
Article
Chemistry, Physical
Huanyang Wu, Bo Yang
Summary: This study used density functional theory calculations and microkinetic modeling to investigate the structure sensitivity of ethanol steam reforming (ESR) over Rh catalyst. The dominant reaction paths on stepped Rh(2 1 1) and terraced Rh(1 1 1) surfaces were determined. Microkinetic analysis revealed that Rh(2 1 1) exhibited higher activity and CO2 selectivity than Rh(1 1 1), but lower stability due to carbon deposition. A high steam/ethanol ratio was found to be important in reducing carbon accumulation and improving CO2 selectivity. The study also identified the rate-controlling steps and the effect of metal dopants on the catalyst stability.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Marios Kourtelesis, Tamara Siqueira Moraes, Lisiane Veiga Mattos, Dimitrios K. Niakolas, Fabio Bellot Noronha, Xenophon Verykios
Summary: A study was conducted on Pt/CeO2 catalysts with different support morphologies for low temperature ethanol steam reforming, revealing that support morphology influences certain reaction routes, while the reaction scheme remains the same regardless of the support. At 573K, Pt/CeO2- PPT exhibited rapid deactivation, while Pt/CeO2- NR remained rather stable. XPS surface analysis showed significant Pt reduction on CeO2 nanorods at 573K, leading to the reduction of Ce4+ into Ce3+.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Energy & Fuels
Shanshan Shao, Pengfei Zhang, Xiaohua Li, Yongbo Yu
Summary: Hydrogen production from simulated aqueous bio-oil was studied using a two-stage system with dolomite and NiO/CeO2-Al2O3 catalyst. The increase in hydrogen yield was higher for the less active catalyst in the two-stage system. Higher reforming temperature and steam/carbon ratio improved hydrogen production and gas composition. Phenol removal was enhanced by pre-reforming with dolomite, reducing coke deposition. The deactivated catalysts showed lower coke deposition in the two-stage system compared to the one-stage system. The study improved the stability of Ni-based catalyst for hydrogen production.
Article
Energy & Fuels
Michael Fabrik, Amgad Salama, Hussameldin Ibrahim
Summary: In this study, a modeling framework is proposed to simulate the performance of a biogas-reforming reactor undergoing deactivation due to the presence of hydrogen sulfide. The proposed reactor model is validated against literature data, showing good agreement. An industrial parametric case study demonstrates the potential of this model in analyzing real reactors.
Article
Engineering, Environmental
Leire Landa, Aingeru Remiro, Beatriz Valle, Javier Bilbao, Ana G. Gayubo
Summary: The choice of reactors and reforming strategies significantly affects H2 production from raw bio-oil. Packed-bed and fluidized-bed reactors were compared in terms of conversion, product yields, and deactivation using a NiAl2O4 spinel catalyst for steam reforming and sorption enhanced steam reforming (with dolomite to capture CO2). The results showed that the FBR had lower H2 yields due to less efficient gas-solid contact. Catalyst deactivation was related to coke deposition and varied depending on the reactor type and reforming strategy. The presence of dolomite extended the stable catalyst activity period in both reactors.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Mohit Yadav, Imre Szenti, Marietta Abel, Akos Szamosvolgyi, Korneli B. Abrahamne, Janos Kiss, Pap Zsolt, Andras Sapi, Akos Kukovecz, Zoltan Konya
Summary: This study successfully synthesized platinum-gallium nanoalloy catalyst via ultrasound-assisted impregnation method, which exhibited excellent catalytic activity and H-2 formation rate in the steam reforming of ethanol reaction. This is attributed to the high interaction between gallium and platinum, resulting in enhanced dehydrogenation and acidic properties, thus increasing the yield of H-2.
Article
Chemistry, Applied
Naiara Garcia-Gomez, Beatriz Valle, Jose Valecillos, Aingeru Remiro, Javier Bilbao, Ana G. Gayubo
Summary: This study investigates the effect of a low-cost catalyst pre-reforming step on the stability of a Ni-spinel catalyst in the steam reforming of raw bio-oil. The results show that the PSR temperature affects the type and distribution of coke deposits, with PSR at 400 degrees Celsius enhancing the stability of the Ni spinel catalyst.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Vildan Aker, Nezihe Ayas
Summary: Ethanol steam reforming (ESR) is a promising technology for hydrogen production, and the study focuses on the influence of cobalt loading and ESR conditions on H2 selectivity and catalytic stability. Ni-Co/Al2O3 (5 wt% Co) catalyst exhibited the best performance with small metal crystallite size, high surface area, and high catalytic activity. Optimal conditions for 100% ethanol conversion and maximum H2 selectivity were found to be 600°C, 0.05 L/gcat.h, and S:C molar ratio of 12:1. The Ni-Co interaction was found to affect the catalytic activity, and the stability test showed minimal coke deposition.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Bogdan Ulejczyk, Lukasz Nogal, Michal Mlotek, Krzysztof Krawczyk
Summary: Ethanol steam reforming is a potential source of green hydrogen, but the process is complex and catalyst deactivation due to coke deposition is a common problem. In this study, a plasma reactor was used to mitigate the coke-induced disturbance. The research focused on the influence of steam, and the optimal water/ethanol molar ratio was found to be 4. At this ratio, the energy efficiency reached 22.5 mol(H-2)/kWh with a high ethanol conversion of 92%.
Article
Multidisciplinary Sciences
Hao Meng, Yusen Yang, Tianyao Shen, Wei Liu, Lei Wang, Pan Yin, Zhen Ren, Yiming Niu, Bingsen Zhang, Lirong Zheng, Hong Yan, Jian Zhang, Feng-Shou Xiao, Min Wei, Xue Duan
Summary: This paper reports a RhNi/TiO2 catalyst with a tunable RhNi-TiO2 strong bimetal-support interaction derived from the structure topological transformation of RhNiTi-layered double hydroxides precursors. The resulting catalyst exhibits extraordinary catalytic performance toward ethanol steam reforming reaction with high H-2 yield, production rate, and operational stability.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Bolun Yu, Denan Li, Qianqian Zhu, Shufan Yao, Lifeng Zhang, Yanshuo Li, Zhenxin Zhang
Summary: This study successfully improved the catalytic activity of a zeolitic octahedral metal oxide by incorporating a single zinc species into its micropore. The zinc incorporation achieved a high ethane conversion rate and ethylene selectivity. Mechanism study showed that the isolated zinc site played a crucial role in activating oxygen and ethane, as well as stabilizing intermediates and transition states.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Ruoqi Liu, Hao Fei, Jian Wang, Ting Guo, Fangyang Liu, Zhuangzhi Wu, Dezhi Wang
Summary: This work successfully synthesized a high-performing S-enriched MoS2 catalyst for electrocatalytic nitrogen reduction reaction (NRR), demonstrating high activity and selectivity. The synergistic effect of the 1T phase and bridging S22- species was shown to play a positive role in NRR performances, and DFT calculations revealed the mechanism behind the improved performance.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Pan Xia, Lele Zhao, Xi Chen, Zhihong Ye, Zhihong Zheng, Qiang He, Ignasi Sires
Summary: This study presents a modified gas-diffusion electrode (GDE) for highly efficient and stable H2O2 electrosynthesis by using trace polymethylhydrosiloxane (PMHS). DFT calculations provide an in-depth understanding of the roles of PMHS functional groups.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Kwangchol Ri, Songsik Pak, Dunyu Sun, Qiang Zhong, Shaogui Yang, Songil Sin, Leliang Wu, Yue Sun, Hui Cao, Chunxiao Han, Chenmin Xu, Yazi Liu, Huan He, Shiyin Li, Cheng Sun
Summary: Different B-doped rGO catalysts were synthesized and their 2e- oxygen reduction reaction (ORR) performance was investigated. It was found that the 2e- ORR selectivity of B-doped rGO was influenced by the B content and oxygen mass transfer conditions. The synthesized catalyst exhibited high 2e- ORR selectivity and was capable of degrading organic pollutants continuously.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Li Lv, Lin Lei, Qi-Wen Chen, Cheng-Li Yin, Huiqing Fan, Jian-Ping Zhou
Summary: Monoclinic phase La2Ti2O7 and orthorhombic phase Bi4Ti3O12 are widely used in photocatalysis due to their layered crystal structure. The electronic structures of these phases play a crucial role in their photocatalytic activity. Heat treatment in a nitrogen atmosphere introduces more oxygen vacancies into the S-scheme heterojunction, leading to enhanced NO removal efficiency.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Choe Earn Choong, Minhee Kim, Jun Sup Lim, Young June Hong, Geon Joon Lee, Keun Hwa Chae, In Wook Nah, Yeomin Yoon, Eun Ha Choi, Min Jang
Summary: In this study, the synergistic effect between argon-plasma-system (AP) and catalysts in promoting the production of reactive species for water remediation was investigated. By altering the oxygen vacancies concentration of CeO2/Bi2O3 catalyst, the production of hydrated electrons was stimulated for PFOA removal. The results showed that the built-in electric field in the Bi/Ce0.43 interface enhanced electron migration and eaq- generation, leading to improved PFOA removal efficiency.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Yushan Wu, Di Xu, Yanfei Xu, Xin Tian, Mingyue Ding
Summary: Efficient synthesis of primary amines from carbonyl compounds was achieved via reductive amination using Ru@NC-Al2O3 as a catalyst, exhibiting high activity and selectivity under mild conditions.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Yilan Jiang, Peifang Wang, Tingyue Chen, Keyi Gao, Yiran Xiong, Yin Lu, Dionysios D. Dionysiou, Dawei Wang
Summary: By controlling the content of Co and Ni in Co1-xNixFe2O4, the production of O-1(2) from H2O2 can be regulated. NiFe2O4, with the lowest lattice distortion degree, can efficiently produce O-1(2) as the dominant reactive oxygen species. The system also exhibits significant resistance to water matrix interference.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Shuai Feng, Donglian Li, Hao Dong, Song Xie, Yaping Miao, Xuming Zhang, Biao Gao, Paul K. Chu, Xiang Peng
Summary: In this study, MoO2/Mo2N heterostructures were prepared by regulating the coordination of Mo atoms. The electrocatalyst exhibits high current density and excellent stability for hydrogen evolution reaction.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Jia-Cheng E. Yang, Min -Ping Zhu, Daqin Guan, Baoling Yuan, Darren Delai Sun, Chenghua Sun, Ming-Lai Fu
Summary: This study successfully modulated the electron configuration and spin state of millimetric metal catalysts by adjusting the support curvature radius. The electronic structure-oriented spin catalysis was found to affect the degradation of pollutants, providing new insights for the design and production of highly active, reusable, and stable catalysts.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Tao Zhong, Su Tang, Wenbin Huang, Wei Liu, Huinan Zhao, Lingling Hu, Shuanghong Tian, Chun He
Summary: In this study, a highly efficient photocatalyst for the elimination of CH3SH was developed by engineering different crystal facets and coupling them with PHI. Cu (111)/PHI exhibited the highest elimination efficiency and showed good stability and reusability. The enhanced surface electron pump effect and effective adsorption mechanisms were revealed through comprehensive characterizations and DFT calculations.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(2024)
Article
Chemistry, Physical
Feifei Yang, Tianyu Zhang, Jiankang Zhao, Wei Zhou, Nicole J. Libretto, Jeffrey T. Miller
Summary: A Ni3Sn intermetallic nano particle was found to have geometrically isolated Ni sites that could selectively cleave C-O bonds in biomass derivatives. This nano particle showed high activity and selectivity towards 2-methylfuran, unlike Ni nanoparticles that produced other unwanted products derived from the aromatic rings.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2024)
Article
Chemistry, Physical
Lulu Qiao, Di Liu, Anquan Zhu, Jinxian Feng, Pengfei Zhou, Chunfa Liu, Kar Wei Ng, Hui Pan
Summary: This study reveals that surface evolution plays a crucial role in enhancing the electrocatalytic performance of transition metal oxides for electrochemical nitrate reduction reaction (e-NO3RR). Incorporating nickel into Co3O4 can promote surface reconstruction and improve the adsorption of intermediates and reduce energy barriers, leading to enhanced catalytic performance. The reconstructed cobalt-nickel hydroxides (CoyNi1_y(OH)2) on the catalyst's surface serve as the active phase.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2024)
Article
Chemistry, Physical
Xinyu Song, Yang Shi, Zelin Wu, Bingkun Huang, Xinhao Wang, Heng Zhang, Peng Zhou, Wen Liu, Zhicheng Pan, Zhaokun Xiong, Bo Lai
Summary: This study explores the discriminative activities and mechanisms for activation of O-O bond in peroxy compounds via single-atom catalysts (SACs) with higher coordination numbers (M-N5). The atomic catalyst (Fe-SAC) with Fe-N5 as the active center was constructed, effectively activating peroxymonosulfate (PMS), peroxydisulfate (PDS), and hydrogen peroxide (H2O2). The study demonstrates the degradation efficiencies of acyclovir are related to the O-O bond length in different peroxy compounds, and reveals the discriminative mechanisms for activation of O-O bond in different Fenton-like systems.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2024)
Article
Chemistry, Physical
Yangzhuo He, Hong Qin, Ziwei Wang, Han Wang, Yuan Zhu, Chengyun Zhou, Ying Zeng, Yicheng Li, Piao Xu, Guangming Zeng
Summary: A dual-metal-organic framework (MOF) assisted strategy was proposed to construct a magnetic Fe-Mn oxycarbide anchored on N-doped carbon for peroxymonosulfate (PMS) activation. The FeMn@NC-800 catalyst exhibited superior activity with almost 100% degradation of sulfamethazine (SMZ) in 30 minutes. The study provided insights for the rational design of high-performance heterogeneous catalysts and proposed a novel nonradical-based catalytic oxidation for environmental cleaning.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2024)