|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Enhancing hydrothermal stability of framework Al in ZSM-5:From the view on the transformation between P and Al species by solid-state NMR spectroscopy显示文摘HZSM-5,with good surface acidity and shape selectivity,was reported as hydrocarbon cracking catalyst for multiple decades,however the hydrothermal stability,especially dealumination of tetrahedrally coordinated framework aluminum(TFAl),has been proved extensively as one of the major challenges during reactionregeneration process.Phosphorus was proposed to stabilize TFAl and indeed it enhanced the hydrothermal stability.Unfortunately,most of the phosphorus species would remain outside of the zeolite pore,mainly as polyphosphate species,and block the micropore severely,with only a limited portion introduced into the channel being able to interact with TFAl.Enlarging the pore size by alkali treatment(desilication)is one of the most convinced methods,but the details about specific P species during alkali treatment and its transformation upon hydrothermal activation is not acquired,thus the mechanism has not been fully understood.Herein,the P-containing species and its transformation during direct P modification and acid/alkali treatment followed by Pmodification have been studied,and the mechanism on the interaction between P and Al species has been investigated,using several analytical methods,especially Solid-state nuclear magnetic resonance(SSNMR)spectroscopy.It was found that the combination of desilication and subsequent phosphorus modification can enhance the activity of the ZSM-5 for the cracking of ethylcyclohexane,due to the better hydrothermal stabilization of acid sites by the enhanced interaction between phosphorus and TFAl,resulting from the improved accessibility of TFAl because of the successful generation of mesoporosity.Whereas the acid treatment followed by phosphorus modification,with declined retention of crystallinity and P/Al ratio,monoclinic/orthorhombic transition during steam activation,and the failed generation of mesopores,would cause obvious aggregation of the phosphorus species and could not improve the hydrothermal stability of the ZSM-5 effectively,and the direct phosphatation turned out much worse.Finally,a specific index that the intensity of the signal at 39 in 27Al MAS NMR spectra before steam activation was proposed as the indicator for determining the efficiency of phosphorus modification.And the proposed mechanism on the interaction between phosphorus and TFAl during the phosphorus modification could also be applicable in other zeolites. | Lei Han Ying Ouyang Enhui Xing Yibin Luo Zhijian Da | 2020 | Chinese Journal of Chemical Engineering2020，28，12： | 3 |
| 2 | Molecular dimensions of tetrahydrodicyclopentadiene isomers and shape selectivity of zeolite catalysts 显示文摘 | Xing Enhui Zhang Xiangwen Wang Li | 2005 | Catalysis Communications2005，6，： | 1 |
| 3 | Greener synthesis route for jet propellant-10: The utilization of zeolites to replace AlCl3 显示文摘 | Xing Enhui Zhang Xiangwen Wang Li | 2007 | Green Chemistry2007，9，1： | 1 |
| 4 | Endo- to exo-isomerization of tetrahydrodicyclopentadiene catalyzed by commercially available zeolites 显示文摘 | Xing Enhui Mi Zhentao Xin Chengwei | 2005 | J Molecular Catalysis A: Chemical2005，231，： | 1 |
| 5 | Endo-lo exo-isom- erization of tetrahydrodicyclopentadiene catalyzed by commercial- ]y available zeolites显示文摘 | Xing Enhui Mi Zhentao Xin Chengwei | 2005 | Journal of Molecular Catalysis A : Chemi- cal2005，231，： | 1 |
| 6 | Ni nanoparticles encapsulated within H-type ZSM-5 crystals for upgrading palmitic acid to diesel-like fuels显示文摘Meso-Ni@HZSM-5 bi-functional catalysts were successfully post-encapsulated with about 3-7 nm Ni nanoparticles within HZSM-5 crystals,which exhibited significantly efficient conversion activity(67.4 g[palmitic acid]g[Ni]^(−1)h^(−1))of palmitic acid and 100%selectivity of hydrocarbons with the outstanding stability during recycling application,compared to the impregnated Ni/HZSM-5 catalyst(14.0 g[palmitic acid]g[Ni]^(−1)h^(−1)). | Yanchun Shi Chen Gao Enhui Xing Jimei Zhang Feng Duan He Zhao Yongbing Xie | 2022 | Chinese Chemical Letters2022，33，2： | 0 |
| 7 | Chemical-NIR dual-powered CuS/Pt nanomotors for tumor hypoxia modulation,deep tumor penetration and augmented synergistic phototherapy显示文摘The complex tumor microenvironment(TME)with the characteristics of severe hypoxia,enriched hydro-gen peroxide(H_(2)O_(2))and dense nature significantly restricted the therapeutic efficacy of nanomedicine in cancer treatment.Synthetic micro/nanomotors have shown multiple versatility in modulating the abnor-mal TME and overcoming the limited penetration in solid tumor.Herein,we constructed a chemical-NIR dual-propelled nanomotor based on CuS/Pt Janus nanoparticles with IR820 encapsulation for hypoxia alle-viation,deep tumor penetration and augmented synergistic photodynamic(PDT)and photothermal ther-apy(PTT).The deposited Pt effectively catalyzed tumor endogenous H_(2)O_(2) into oxygen,which extremely relieved the tumor hypoxia state and allowed the chemical propulsion of nanomotors.Under NIR irra-diation,the Janus nanomotors exhibited more obvious movement via efficient photothermal conversion.Such autonomous motion significantly improved the tumoral accumulation of nanomotors and facilitated much deeper penetration inside tumor in vivo.In addition,enriched oxygen also promoted the genera-tion of reactive oxygen species(ROS)for augment of PDT,which achieved satisfied antitumor effect in combination with the PTT treatment.Therefore,this strategy based on CuS/Pt Janus nanomotors would provide an innovative dimension for considerable applications in effective cancer management. | Wenjun Wang Enhui Ma Pengyu Tao Xiaoyu Zhou Yujuan Xing Liang Chen Yingying Zhang Jingjing Li Kai Xu Hong Wang Shaohui Zheng | 2023 | Journal of Materials Science & Technology2023，，17： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员