The effects of H2 in the feed gasses on the Chichibabin condensation of ammonia with formaldehyde and acetaldehyde for pyridine and 3-picolines synthesis were studied in this work. It was observed that over Pt/ZSM-5 a...
The effects of H2 in the feed gasses on the Chichibabin condensation of ammonia with formaldehyde and acetaldehyde for pyridine and 3-picolines synthesis were studied in this work. It was observed that over Pt/ZSM-5 and H-ZSM-5 catalyst hydrogen can moderate the deactivation, depressed the coke formation, slightly lower the initial yield of pyridine bases and increase the selectivity of pyridine over 3-picoline. These effects cannot be simply attributed to the reactant dilution by H2, while are similar as those of spilt-over hydrogen on a Pt/ZSM-5 catalyst on this reaction. These phenomena are taken as the evidence to support the hypothesis that molecular H2 is activated by the pure zeolite during the Chichibabin condensation.
作者：
Keng XieHuizhou LiuKey Laboratory of Green Process and Engineering
State Engineering Laboratory of Clean Production Technology for Hydrometallurgy Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China Graduate University of the Chinese Academy of Sciences
Beijing 100039 China Key Laboratory of Green Process and Engineering State Engineering Laboratory of Clean Production Technology for Hydrometallurgy Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China
An experimental investigation is presented on Ti (Ⅳ) extraction from acidic sulfate solutions using trialkylphosphine oxide (TRPO) in dodecane as an *** effects of H2SO4 concentration, TRPO concentration and phase ra...
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An experimental investigation is presented on Ti (Ⅳ) extraction from acidic sulfate solutions using trialkylphosphine oxide (TRPO) in dodecane as an *** effects of H2SO4 concentration, TRPO concentration and phase ratio O/A on the phase behavior and extraction behavior of the system were *** splitting of a system from biphasic to tfiphasic is *** third phase appears at different aqueous H2SO4 concentrations with varying initial TRPO concentrations and the volume of the middle phase increases as the volume of TRPO added increases.
The novel efficient procedure has been developed for the conjugate addition of amines to electron deficient alkenes.A series of hydrotalcite-like materials were synthesized as catalyst for the conjugate addition of am...
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The novel efficient procedure has been developed for the conjugate addition of amines to electron deficient alkenes.A series of hydrotalcite-like materials were synthesized as catalyst for the conjugate addition of amines and *** optimizing the reaction conditions,ZnAl-LDHs (3:1) was chosen as the best catalyst for the *** results showed that the catalyst worked very well for the conjugate addition of amines to electron deficient alkenes with the excellent yields in several *** simplicity,no solvent,low cost of the catalyst,high yields,reusability,excellent chemoselectivity,wide applicability are the key features of this method.
A technique including direct acid leaching, vanadium precipitation with alkaline, sodium hydroxide releaching, impurity removing by adjusting pH value, precipitation vanadium with ammonium chloride, and vanadium pento...
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A technique including direct acid leaching, vanadium precipitation with alkaline, sodium hydroxide releaching, impurity removing by adjusting pH value, precipitation vanadium with ammonium chloride, and vanadium pentoxide by roasting steps was proposed according to the characteristic of Xichuan clay vanadium mineral. The factors influencing leaching vanadium such as temperature and the concentration of sulfuric acid were investigated and optimized. The experimental results indicate that the extract ratios of V205 can reach 94% and 92% at a sodium chlorate ratio of 3% and a manganese dioxide ratio of 3%, respectivdy. A completely chemical precipitation method was adopted to decontaminate and enrich the vanadium in the acid leaching solution. The X-ray diffraction （XRD） pattern and the purity analysis of vanadium pentoxide indicate that the purity of final vanadium pentoxide can reach 99% and meet the standard specifications. The total recovery can reach about 75%. The technique has the characteristics of simplicity, less investment, and more environment safety as compared with the traditional salt roasting method.
In-situ coupling of adsorptive desulfurization and biodesulfurization is a new desulfurization technol- ogy for fossil oil. It has the merits of high-selectivity of biodesulfurization and high-rate of adsorptive desul...
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In-situ coupling of adsorptive desulfurization and biodesulfurization is a new desulfurization technol- ogy for fossil oil. It has the merits of high-selectivity of biodesulfurization and high-rate of adsorptive desulfurization. It is carried out by assembling nano-adsorbents onto surfaces of microbial cells. In this work, In-situ coupling desulfurization technology of widely used desulfurization adsorbents of γ-Al2O3, Na-Y molecular sieves, and active carbon with Pseudomonas delafieldii R-8 were studied. Results show that Na-Y molecular sieves restrain the activity of R-8 cells and active carbon cannot desorb the sub- strate dibenzothiophene (DBT). Thus, they are not applicable to in-situ coupling desulfurization tech- nology. Gamma-Al2O3 can adsorb DBT from oil phase quickly, and then desorb it and transfer it to R-8 cells for biodegradation, thus increasing desulfurization rate. It is also found that nano-sized γ-Al2O3 increases desulfurization rate more than regular-sized γ-Al2O3. Therefore, nano- γ-Al2O3 is regarded as the better adsorbent for this in-situ coupling desulfurization technology.
A series of asymmetric methide anion based ionic liquids containing nitrile groups have been synthesized for the first time using the method of ion-exchange between sodium/potassium methide and various quaternary bro-...
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A series of asymmetric methide anion based ionic liquids containing nitrile groups have been synthesized for the first time using the method of ion-exchange between sodium/potassium methide and various quaternary bro-mide/chloride salts of trimethylamine, triethylamine, tributylamine, N-methylpyrrolidine, and N-methylimidazole. All of the functionalised ionic liquids were characterized by IR, 1H, 13C NMR, MS and elemental analysis. The de-composition temperature of the ionic liquids measured via TGA ranged from 219 to 339 ℃. The functionalised ionic liquid, [Bmim][C(CN)2COCH3], was used as a ligand for Suzuki coupling reaction. The yields of the coupling reaction increased 10%-15% by the addition of the functionalised ionic liquid, [Bmim] [C(CN)2COCH3].
A novel method of enzymatic hydrolysis was developed in this paper to produce a high conversion yield and hydrolysis rate.A comparison was described by using three methods of enzymatic hydrolysis and adsorption of ste...
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A novel method of enzymatic hydrolysis was developed in this paper to produce a high conversion yield and hydrolysis rate.A comparison was described by using three methods of enzymatic hydrolysis and adsorption of steam exploded straw(SEWS):shaking ball in the regime,shaking with stirrer bed,and static *** most adequate filter-paper activity,speed and reaction time were 3.6×10^(-7) mol/(s·mL),150 r/min and 24 h,respectively,with the reducing sugar yield of *** results showed that the method of shaking ball produced the highest adsorption,conversion yields and hydrolysis rate of the *** might be due to the continuous frequency increase of enzyme adsorption and desorption on the substrate surface as well as the relieved end-product *** morphological variation of SEWS was characterized by environmental scanning electron microscopy(ESEM).
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