Rationally constructed Ti sites of TS-1 for epoxidation reactions

来源 :科学通报(英文版) | 被引量 : 0次 | 上传用户:sznzhu
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Diminishing petroleum reserves,together with emerging envi-ronmental concerns on the sustainability of the modern chemical industry,have triggered the research on diversifying raw materials,developing green processes,and producing value-added products.This requires the green and efficient conversion of fossil fuel to downstream highly value-added chemicals,which offers new chances and challenges for the chemical industry.As critical organic chemical intermediates,epoxides are widely used in fields of medicine,food,automobiles,agriculture,and construction.However,most of the epoxides are currently synthesized by organic peroxy acid,chlorohydrin or Halcon processes.These pro-cesses have disadvantages of severe environmental pollution,com-plicated processing and numerous co-products,which are against the principle of green chemistry or atomic economy.Therefore,there is an urgent need to develop green,simple,and highly selec-tive epoxidation processes.
其他文献
铁电半导体能够单片式集成半导体p-n结光伏与铁电体光伏,有望突破太阳能光伏电池能量转换效率的Shockley-Queisser理论极限.本研究采用Mn4+、Co2+等磁性离子替代技术在BiFeO3系固溶体钙钛矿中成功创制出一系列窄禁带室温铁电半导体,应用传统固相反应法制备了0.50BiFeO3-0.25A1MnO3-0.25A2TiO3(A1=Ca、Sr、Ba,A2=Sr、Ba、Pb)和0.49BiFeO3-0.26BaTiO3-0.25(Sr1-xBax)(Co1/3Nb2/3)O3单相钙钛矿陶瓷.室温
In early summer,a quasi-stationary rain band usually extends from Yangtze-Huaihe Basin in China to the east of Japan,account-ing for over 30% the annual total rainfall there.This episode of rainy season is named as Meiyu in China,Baiu in Japan and Changma
期刊
Lanthanide-doped nanoparticles,which contain lanthanide ions doped in an inorganic host,can generate wide wavelength range emissions corresponding to inner shell 4f-4f transitions of lan-thanide ions [1-3].Unfortunately,lanthanide 4f transitions have a na
期刊
Ultrahigh-energy (UHE) photons up to 1.4 peta-electronvolts have been observed by new cosmic-ray telescope in China [1]-a hint that Lorentz invariance might break down at the Planck-scale level [2].rnAs one of the most sensitive gamma-ray detector arrays
期刊
Gene therapy is expected to fundamentally correct mutant genes to cure genetic diseases in vivo.As a delivery system for gene therapy,adenovirus-associated virus (AAV) vectors have achieved positive results in clinical and preclinical research,including t
期刊
对未来多年代际气候准确预测是气候变化研究的目标,也是当前气候领域的研究热点和极其困难的问题.截至目前,没有多年代际长期预测成功的实例报道,主要原因一是长期气候预测理论发展迟缓,二是足够长度的、精确的、高分辨率的、严格规范的气候代用指标十分缺乏.我们于2004年采用Caterpillar-SSA(毛毛虫-奇异谱分析法)方法对贺兰山地区树轮时间序列进行分解和趋势外推,预测了1998~2022年降水趋势.20多年后的今天,可以用气象观测数据对这个树轮预测结果进行客观评估,旨在探索更合适的年代际气候预测方法.评估
Thousands of resting state functional magnetic resonance imag-ing (RS-fMRI) articles have been published on brain disorders.For precise localization of abnormal brain activity,a voxel-level com-parison is needed.Because of the large number of voxels in th
期刊
To explore the rotational excitation of deformed halo nuclei,the angular momentum projection (AMP)has been implemented in the deformed relativistic Hartree-Bogoliubov theory in continuum (DRHBc),in which both the mean field and collective wave functions a
The coronavirus epidemic may affect us far beyond the virus itself.Previously,there was a considerable body of evidence that maternal stress or other limitations caused by adverse events or emergencies,such as natural disasters,did indeed have long-term e
期刊
Ferroptosis is an iron-dependent form of cell death character-ized by an accumulation of lipid peroxides.A growing body of recent evidence supports the notion that ferroptosis plays an important role in mediating a wide variety of cellular processes in di
期刊