Article
Chemistry, Physical
Yanlin Xu, Wenhong Wang, Bin Liu, Yuan Pan, Bin Dong, Yichuan Li, Yanpeng Li, Hailing Guo, Yongming Chai, Chenguang Liu
Summary: In this study, a novel and highly efficient bifunctional catalyst was reported for the hydrodeoxygenation of guaiacol. The doping of Nb2O5 significantly enhanced the activity of the CoMoS/gamma-Al2O3 catalyst. The modification of Nb2O5 weakened the metal-support interaction, improved the sulfidation degree of Mo species, and increased the dispersion of MoS2 phases, leading to the formation of more MoS2 edges and thus promoting the scission of C-(sp2)-O bonds in phenolics and enhancing the yield of hydrocarbons, especially benzene.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Physical
Rubens W. S. Lima, Thiago L. R. Hewer, Rita M. B. Alves, Martin Schmal
Summary: The study revealed significant differences in the compounds adsorbed or deposited on the catalysts surface of Ni-Mo/SBA-15 and Ni-Mo/Al2O3 before and after the reaction. Carbon deposits on the SBA-15 catalyst were aliphatic simple molecules, while the alumina catalyst contained deposits of aromatic and oxygenated organic substances. Post-reaction analysis showed that the carbon deposited on NiMo/SBA-15 were mainly light polymer types like nanotubes and nanofibers, while heavier carbons like graphite formed on the alumina catalyst.
MOLECULAR CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Shanshan Feng, Xudong Liu, Zhishan Su, Guiying Li, Changwei Hu
Summary: In this study, Ru/SBA-15 catalysts were prepared and used for the production of cyclohexanols from lignin-derived phenols. The catalyst showed excellent hydrogenation activity, stability, and demethoxylation activity. The reaction rate of the catalyst was zero-order at 80℃, with a low activation energy.
Article
Chemistry, Physical
Rafal Janus, Piotr Natkanski, Mariusz Wadrzyk, Marek Lewandowski, Marek Michalik, Piotr Kustrowski
Summary: This paper introduces a new synthetic method for preparing carbon mesostructures of different structures, which is simple and does not require pretreatment of silica and carbonization. Through systematic studies on materials, it is found that this method can achieve highly ordered carbon structures while maintaining the morphology of the mother silica.
Article
Engineering, Chemical
Jose Escobar, Maria C. Barrera, Victor F. Santes, Benoit Fouconnier
Summary: The addition of low concentrations of rare-earth (La) to γ-Al2O3 improved the stability of the catalyst and the acidity of γ-Al2O3, thereby promoting the deoxygenation of guaiacol in the hydrodeoxygenation (HDO) reaction.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Agricultural Engineering
Fan Wang, Chenglong Wen, Mohong Lu, Peng Zhang, Jie Zhu, Mingshi Li, Yuhua Shan, Chunshan Song
Summary: Mo2N@NC/SBA-15 catalysts with high stability and dispersion were prepared using MoCl5 and dicyandiamide as Mo and C/N sources, respectively. During the carbonization process under H2 at an elevated temperature, Mo2N was formed in situ while dicyandiamide was converted to N-doped carbon (NC). The presence of N-doped carbon species around Mo2N NPs inhibited the aggregation of Mo2N NPs, resulting in the generation of ultrafine Mo2N nanoparticles. Mo2N@NC/SBA-15 catalysts exhibited high hydro-deoxygenation activity and aromatic compound selectivity. The selectivity towards aromatic products reached 92% and guaiacol conversion reached 99% at 380 degrees C and 2 MPa.
BIOMASS & BIOENERGY
(2023)
Article
Engineering, Chemical
Martin Schmal, Rubens W. S. Lima, Thiago L. R. Hewer, Rita M. B. Alves
Summary: This study investigates the hydrogenation processes of bio-oils using different catalysts and supports. The results show that the SBA-15 catalysts exhibit higher activity and better performance than the alumina catalyst. The temperature also plays an important role in the conversion of guaiacol and anisole, with higher conversions observed at 300 degrees C. The Ni-Mo/SBA-15 catalyst at 200 degrees C shows the best results for the HDO deoxygenation of the guaiacol and anisole mixture (96.5%).
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Penghui Yan, Eric Kennedy, Michael Stockenhuber
Summary: Ion-exchanged Ru/ZSM-5 and Ru/BEA catalysts show high intrinsic HDO activity with finely dispersed metal particles interacting strongly with oxygen atoms. High H2 adsorption activity facilitates hydrogenation reaction, while acid sites play a pivotal role in deoxygenation reaction.
JOURNAL OF CATALYSIS
(2021)
Article
Energy & Fuels
Xing Zhang, Jingfeng Wu, Lingjun Zhu, Shurong Wang
Summary: A novel strategy was proposed to produce diesel-like liquid fuel from lignin-derived bio-oil and plant/animal oil through hydrodeoxygenation-in situ esterification. The utilization of both aromatic units and -OCH3 groups of lignin was achieved. Model compounds, guaiacol and lauric acid, successfully produced cyclohexyl laurate and methyl laurate, satisfying the biodiesel standard. The yield of esters reached 112.5 mol % with nearly complete conversion of guaiacol. The presence of an additional -OCH3 group hindered the formation of cyclohexanol while increasing the yield of methanol. Lignin-derived dimers were also efficiently converted into diesel-like liquid fuel rich in esters and cycloalkanes.
Article
Chemistry, Multidisciplinary
Yang Xiao, Anand Ramanathan, Bala Subramaniam, Arvind Varma
Summary: In this study, Pt supported on Nb, W, and Zr-incorporated KIT-6 catalysts were prepared and tested for the gas-phase hydrodeoxygenation (HDO) of a model compound of bio-oil. The results showed that the 1 wt % Pt/Nb-KIT-6 catalyst exhibited excellent HDO performance under relatively mild conditions, and the catalyst showed good resistance to coking.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Chemistry, Physical
Ching-Yu Wang, Junsung Ra, Kai Shen, John M. Vohs, Raymond J. Gorte
Summary: Hydrodeoxygenation (HDO) of m-cresol was studied using WO x -Pt/SBA-15 as catalyst and different light alkanes as H-2 carriers. The stability of dehydrogenation reaction of n-hexane on Pt/SBA-15 with 9 nm pores depended on pressure, with stability observed above 40 bar. WO x -decorated Pt/SBA-15 showed high-pressure stability for both dehydrogenation of n-hexane and HDO of m-cresol. HDO of m-cresol using H-2 from n-pentane and 3-methylpentane over WO x -Pt/SBA-15 was also reported.
Article
Chemistry, Multidisciplinary
Qichen Wang, Mingyi Wang, Xuehao Li, Peng Liu, Chuanmin Ding, Lian Wang, Junwen Wang, Kan Zhang, Ping Liu
Summary: In this study, Ni-Fe/AC catalysts were prepared with different proportions of Ni-Fe loading for vapor phase carbonylation of ethanol to produce propionic acid. The introduction of Fe into Ni/AC formed a Ni-Fe alloy, which inhibited the sintering of the metal and improved the dispersibility of the metal particles. The synergy between Ni and Fe reduced the reduction temperature of NiO and increased the content of active centers Ni-0 on the catalyst surface. The 1Ni-1Fe/AC catalyst exhibited the highest catalytic performance, with an increase in the co-selectivity of propionic acid and ethyl propionate by 11% and a doubled space-time yield compared to the Ni/AC catalyst.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Physical
Mohammad Saleheen, Osman Mamun, Anand Mohan Verma, Dia Sahsah, Andreas Heyden
Summary: Bio-oil derived from lignocellulosic biomass can be used as a substitute for petroleum fuels after deoxygenation. In this study, the hydrodeoxygenation mechanism of guaiacol, a bio-oil model compound, on Pt(1 1 1) terrace sites in the presence of different solvents was investigated using first-principles DFT calculations and microkinetic reactor modeling. The results revealed that catechol was the major aromatic product, and the rate controlling species and transition states varied in different reaction environments.
JOURNAL OF CATALYSIS
(2023)
Article
Engineering, Chemical
Cristina Loricera, Rufino Navarro Yerga, Laura Barrio, Barbara Pawelec, Jose Luis G. Fierro
Summary: The positive role of pentacoordinated Al-V sites in the catalyst behavior was evidenced in the vapor phase hydrodeoxygenation (HDO) of phenol. The USY zeolite was more efficient than ZSM-5, and the superior activity of Ir-Pt/USY was attributed to the cumulative effects of various factors working in synergy.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Applied
Vahide Nuran Mutlu, Selahattin Yilmaz
Summary: The glycosidation of glucose with n-butanol was studied using sulphated Zr and tungstophosphoric acid incorporated SBA-15 catalysts, showing improved acidity and higher yields of butyl glucoside. The TPA-SBA-15 catalyst demonstrated the highest activity and selectivity, with stable and reusable performance. Further studies on reaction temperature and catalyst amount were conducted to optimize the reaction parameters.