4 results about "Cryptomelane" patented technology

The invention discloses an ethylbenzene dehydrogenation catalyst as well as a preparation method and application thereof. The catalyst is prepared from Fe2O3, K2O, CeO2, MoO3 and a doped cryptomelane oxide. The catalyst provided by the invention is used in a reaction for preparing styrene by ethylbenzene dehydrogenation, and has the characteristics of high activity, high stability and good carbon deposition resistance.

The invention discloses a catalyst grading method for purifying methanol and application. The grading method comprises the following steps: sequentially arranging a first catalyst and a second catalyst along a material flow direction; the first catalyst is an MFI type molecular sieve catalyst; the second catalyst comprises a cryptomelane molecular sieve KOMS-2. According to the invention, methanol in-situ catalytic oxidation cyclic regeneration is realized, and the oxidation rate and mineralization rate of methanol and the adsorption capacity of the catalyst to methanol are obviously improved.

The application discloses a kind of low-temperature synergic removal NO x And VOCs of cryptomelane-based core-shell catalyst and its preparation method and application.The catalyst is with cryptomelane supported copper oxide (Cu-OMS-2) as core, TiO2 as shell, and forms Cu-OMS-2@TiO2 core-shell composite structure, wherein TiO2 accounts for 20%~35%, CuO doping amount is 5%~20%, and the balance is cryptomelane (OMS-2).By using space limit under the condition of 175~300 ℃, the active sites are separated by coupling interface electron limit, the efficient synergic removal of NO x And VOCs is realized, and the efficiency is greater than 90%, which significantly relieves the mutual inhibition between the two types of reactions, reduces the generation of secondary pollutants, and has excellent stability.The catalyst is suitable for low-temperature industrial flue gas purification and has good industrial application prospect.

The application discloses a method for degrading organic pollutants containing carbonyl and carboxyl by using cryptomelane oxygen vacancies, and adds cryptomelane into wastewater containing organic pollutants containing carbonyl and carboxyl, mixes sufficiently to generate hydrogen peroxide, and further degrades the organic pollutants by the hydrogen peroxide; the cryptomelane is an octahedral molecular sieve of manganese oxide mineral, and the crystal form is alpha-MnO2. The application utilizes the catalytic ability, oxidation ability and adsorption ability of the cryptomelane itself to degrade pollutants, and simultaneously utilizes the catalytic ability of the cryptomelane oxygen vacancies to generate hydrogen peroxide from pollutants containing carbonyl and carboxyl to remove the pollutants deeply, and the whole reaction process simultaneously utilizes the oxidation, adsorption and catalytic properties of the cryptomelane. Therefore, the application has the advantages of cheap and easily available required catalyst, wide pH application range, small required catalyst amount, no need of additional other oxidants, low reaction activation energy, completion under normal temperature and pressure air conditions, simple operation, high catalytic efficiency, recyclable catalyst and the like.