ENERGY & FUELS
·
2021
·
IF 3.605
Kun-Lang Lu,Xian-Yong Wei,Guang-Hui Liu,Wei-Wei Yan,Fan Yin,Fa-Zhan Mao,Feng-Hua Wei,Zhi-Min Zong,Hong-Cun Bai
Benzyloxybenzene (BOB) and oxybis(methylene)dibenzene (OBMDB) were used as lignin-related model compounds (LRMCs). Three protic solvents (PSs), i.e., methanol, ethanol (E), and isopropanol, and two aprotic solvents (ASs), i.e., ethyl acetate and n-hexane, were selected to evaluate their effects on the catalytic hydroconversion (CHC) of the LRMCs over MoO3. Under the same conditions, the PSs are more effective for the CHC of LRMCs than the ASs. Under the optimal conditions in E, both BOB and OBMDB are completely converted and the total product yields are 200 and 198.1 mol %, respectively. MoO3 undergoes the surface modification, such as carburization and oxygen vacancy (OV) formation, during the reaction, which is crucial for the CHC of the LRMCs. The OV formation is determined by the self-transformation degree of PSs and the dispersity of ASs to MoO3 through the analyses of solvent-related environmental variables. In addition, solvents affect the CHC of LRMCs by controlling the adsorption performance of MoO3.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2022
·Vol. 7
·期 43
·e202202460
·
IF 2.307
Guohao Xu,Jiale Zhu,Xuedong Zhu
Graphical Compared with the microporous system of MoO 3 /ZSM-5 synthesized by the the physically-blended method, the micro-mesoporous system of ZSM-5@MoO 3 with a core-shell reaction pathway of Mo-acid sites tandem could accelerate the rate of the mass-transfer, promoting aromatization reaction. A novel core-shell ZSM-5@MoO 3 catalyst was successfully synthesized by the hydrothermal coating strategy, and its physicochemical properties and catalytic properties in methane aromatization were investigated using a physically-blended ZSM-5/MoO 3 catalyst as a comparison. Multitechniques including XRD, SEM, TEM, EDS, N 2 adsorption, ICP, IR and IG were employed to investigate the characteristics of methane aromatization reaction and the deactivation of carbon deposits. At the reaction temperature of 700 °C and a space velocity of 2400 mL g −1 h −1 , methane conversion and aromatics selectivity of the core-shell ZSM-5@MoO 3 catalyst were 11.3 % and 88.1 %, respectively, which were higher than those of the physically-blended ZSM-5/MoO 3 catalyst by 3.1 % and 14.8 %, respectively. The special reaction pathway of core (ZSM-5, acid sites)-shell (MoO 3 , Mo sites) and the relatively close proximity between MoO 3 and ZSM-5 were mainly responsible for the excellent properties in the methane aromatization reaction. At the same time, the formation of the micro-mesoporous property accelerated the mass-transfer rate and inhibited the formation of carbonaceous deposition, greatly improving the stability of methane aromatization. Thanks to its core-shell structure, ZSM-5@MoO 3 catalyst showed the excellent properties in methane aromatization.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2019
·
IF 4.63
Ying Cao,Huixiang Wang,Ruimin Ding,Liancheng Wang,Zhong Liu,Baoliang Lv
Ni modified MoO 3 (Ni-MoO 3 ) had been synthesized by a facile one-step hydrothermal technique and was used for oxidative desulfurization (ODS) of dibenzothiophene (DBT) in the decalin/acetonitrile biphasic system with H 2 O 2 as oxidant, the effect of different operating conditions was investigated. Under the optimal reaction condition, Ni-MoO 3 catalyst showed excellent ODS performance toward DBT, the highest sulfur removal efficiency can be up to 99.8% and sulfur content was wiped out from 5000 to 10 ppm, which is more effective than the recent reported MoO 3 -based catalysts. The reaction kinetics obeyed the pseudo-first-order equation with an apparent rate constant of 0.076 min −1 , which is twice that of pure MoO 3 (0.035 min −1 ). The ODS mechanism of DBT with Ni-MoO 3 was explored by combining radical scavenger, FT-IR experiments and theoretical analysis, proving that surface oxygen vacancies and Lewis acid sites play important roles in the high-efficiency ODS reaction with Ni-MoO 3 catalyst.
研究领域:
催化化学
·
环境化学
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 6
·3523-3537
·
IF 5.7
Zhang Yang,Cao Jiamin,Zhou Yuhao,Li Yan,Li Lu,Xie Xin-an
In this paper, a green approach is developed for the effective conversion of corn stalk cellulose to glycolic acid with MoO 3 . The effect of different factors (amount of MoO 3 , reaction temperature, reaction time and the concentration of cellulose) were studied on conversion of cellulose. The total organic acids (glycolic acid, formic acid and lactic acid) yield of 48.2% with 93% conversion was obtained from cellulose at the optimal conditions (0.04 mol MoO 3 , 2 wt% cellulose concentration, 210 °C, 60 min), and the maximum yield of glycolic acid was 23.4%. Furthermore, the mechanism of MoO 3 -catalyzed epimerization of glucose to mannose was investigated by performing density functional theory calculations. The results indicated that the coordination between MoO 3 and the O1 sites of glucose was optimal, and MoO 3 significantly reduces the overall reaction barrier for glucose epimerization, which is the main reason why MoO 3 can promote the conversion of cellulose to glycolic acid.
研究领域:
化学工程
·
可再生资源利用
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Jie Zhang,Chuang Li,Weixiang Guan,Xiaozhen Chen,Xiao Chen,Chi-Wing Tsang,Changhai Liang
Co(Ni)/MoO 3 catalysts were prepared, characterized and evaluated for the hydrogenolysis of bio-derived dibenzofuran (DBF), aiming at the understanding of the promoting effect of Co/Ni on MoO 3 for high-yield production of aromatic products. All Co(Ni)/MoO 3 catalysts selectively cleaved C-O bond, thus effectively transformed DBF to biphenyl (BP) at relatively moderate conditions. The experimental results from varying Mo species by adjusting the reduction temperature of MoO 3 together with XPS and in-situ XRD characteristic were evident that Mo 5+ species was responsible as the major active specie for the reaction. Promotional effect between Co(Ni) and Mo in Co(Ni)/MoO 3 catalysts was observed, resulted from the presence of acidic Co(Ni)MoO 4 species and a large number of Mo 5+ species both of which were created local to the Co(Ni)-O-Mo interface, as can be characterized by in-situ XRD, XPS, H 2 -TPR, NH 3 -TPD, in-situ FT-IR, Raman and TEM. The trend of the initial reaction rate follows: MoO 3 (0.18 μmol∙g cat −1 ∙s −1 ) < Ni/MoO 3 (0.26 μmol∙g cat −1 ∙s −1 ) < Co/MoO 3 (0.29 μmol∙g cat −1 ∙s −1 ), corresponding to the decreasing activation barrier. And the best catalytic activity was observed for the 100% yield of BP over Co/MoO 3 . A possible mechanism, including Co(Ni) facilitated reduction of Mo 6+ to Mo 5+ and Co(Ni) enhanced formation of acidic sites, is proposed to be responsible for the high activity in Co(Ni)/MoO 3 catalysts.
研究领域:
催化化学
·
可再生能源
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）