620-22-4Relevant articles and documents
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Dalton,Regen
, p. 4443 (1979)
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Thermally stable imidazole/heteropoly acid composite as a heterogeneous catalyst for m-xylene ammoxidation
Jeon, Yukwon,Lee, Chanmin,Lee, Gicheon,Kwon, Ohchan,Kim, Jinsol,Park, Sang Sun,Oh, Kyeongseok,Shul, Yong-Gun
, p. 287 - 302 (2021)
Ammoxidation of m-xylene is evaluated in the presence of a customized heteropoly acid catalyst as an imidazole/molybdovanadophosphoric acid (imidazole/PMoV). Imidazole is employed to maintain its heterogeneous phase during the ammoxidation reaction and to provide the thermal stability of PMoV with the expectation that imidazole can generate strong electronic interactions with terminal molybdenum-oxygen on PMoV. The characterizations of the prepared catalysts are performed using SEM–EDX, XRD, FT-IR, Raman, XPS, and TGA to prove the physical and chemical changes by incorporating imidazole to PMoV, respectively. Also, the thermal stability of the developed catalyst is confirmed by the means of heat treatment test at relatively high temperature. The composite catalyst, imidazole/PMoV, shows an excellent conversion rate of over 98% with high selectivity of isophthalonitrile in m-xylene ammoxidation. Moreover, while the imidazole-free PMoV catalyst is deactivated and washed out during the reaction, the catalyst durability of the imidazole/PMoV is preserved without significant activity loss after 5 reaction cycles at 380 °C.
Synthesis method of m (p)-site alkyl substituted cyanobenzene
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Paragraph 0020-0023; 0026-0029, (2022/04/03)
The invention relates to a synthesis method of m (p)-alkyl substituted benzonitrile, which comprises the following steps: (1) m (p)-alkyl substituted benzoate is mixed with ammonia gas after passing through a vaporization furnace, the mixture enters a reactor filled with a catalyst to react, and a gas phase at an outlet of the reactor is introduced into a receiving tank with cooling water to obtain a reaction liquid; and (2) layering the reaction liquid in the step (1) to obtain an oil phase which is an m (p)-alkyl substituted cyanobenzene crude product, and rectifying to obtain an m (p)-alkyl substituted cyanobenzene finished product. According to the synthetic method disclosed by the invention, the m (p)-alkyl substituted cyanobenzene can be prepared only by a one-step method, the reaction only needs to be carried out in a tubular reactor filled with a catalyst, the process route is short, the production efficiency is high, the yield is high, the purity is good, the method is safe, economical and environment-friendly, and the obtained product is high in yield and purity.
Biomass chitosan-derived nitrogen-doped carbon modified with iron oxide for the catalytic ammoxidation of aromatic aldehydes to aromatic nitriles
Wang, Wei David,Wang, Fushan,Chang, Youcai,Dong, Zhengping
, (2020/11/24)
Nitrogen-doped carbon catalysts have attracted increasing research attention due to several advantages for catalytic application. Herein, cost-effective, renewable biomass chitosan was used to prepare a N-doped carbon modified with iron oxide catalyst (Fe2O3@NC) for nitrile synthesis. The iron oxide nanoparticles were uniformly wrapped in the N-doped carbon matrix to prevent their aggregation and leaching. Fe2O3@NC-800, which was subjected to carbonization at 800 °C, exhibited excellent activity, selectivity, and stability in the catalytic ammoxidation of aromatic aldehydes to aromatic nitriles. This study may provide a new method for the fabrication of an efficient and cost-effective catalyst system for synthesizing nitriles.
Method for dehydrating primary amide into nitriles under catalysis of cobalt
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Paragraph 0051-0053, (2021/06/21)
The invention provides a method for dehydrating primary amide into nitrile. The method comprises the following steps: mixing primary amide (II), silane, sodium triethylborohydride, aminopyridine imine tridentate nitrogen ligand cobalt complex (I) and a reaction solvent under the protection of inert gas, carrying out reacting at 60-100 DEG C for 6-24 hours, and post-treating reaction liquid to obtain a nitrile compound (III). According to the invention, an effective method for preparing nitrile compounds by cobalt-catalyzed primary amide dehydration reaction by using the novel aminopyridine imine tridentate nitrogen ligand cobalt complex catalyst is provided; and compared with existing methods, the method has the advantages of simple operation, mild reaction conditions, wide application range of reaction substrates, high selectivity, stable catalyst, high efficiency, and relatively high practical application value in synthesis.
