In order to neutralize the waste gases of non-concentrated nitric acid production from nitrogen oxides the N2O concentration monitoring in the nitrous and outlet gas was hold in the tract of nine units UKL-7 for JSC «NAC “Nitrogen”», using high-temperature catalytic treatment (seven units) and low-temperature selective catalytic purification (two units). Formation of N2O in the platinoid catalyst bed occurs on the first grid in the gas pipe due to the relatively low temperatures. Samples were taken at 6 analysis points. Due to the lack of analysis point at the exit from the catalyst bed, the missing values of N2O concentration are determined by calculations based on data obtained in the experimental reactor with a working diameter 0.15 m, functioning in the mode of industrial unit UKL-7 reactor. Monitoring results showed that the concentrations of N2O between individual units are significantly different (in particular, the N2O concentrations in nitrous gas after the boiler are in the range 1320–1810 ppm), which can be explained by differences in the hydrodynamic flow of the gas flow through the catalyst bed. In units with high-temperature catalytic purification of tail gas the N2O concentration in significantly below the allowable values, so the additional removal of N2O is not required. In the tail gases low-temperature selective catalytic purified the increased concentration of N2O (680–1130 ppm) was found, necessitating further purification, with the tail gas cleanup unit from N2O advisable to place after the gas turbine.

The catalyst for ammonia synthesis Süd-Chemie AmoMax increasing demand from consumers and, therefore, constantly improving, as a key product of the company. The authors discuss the performance of the catalyst for ammonia synthesis AmoMax®-10 based in the wustite, which works much better than conventional ammonia synthesis catalysts based on magnetite. Given the geography of demand for a catalyst – for eight years, about 70 customers from around the world use the catalyst in ammonia synthesis plants of high capacity.

Cs along with potassium is an effective promoter of iron oxide catalysts activity for dehydrogenation of olefins and alkylaromatic hydrocarbons. Under the conditions of the reaction medium the catalyst is a ferritic system consisting of potassium β”- olyferrite, mono ferrites of potassium and cesium, and magnetite. In order to calculate the optimal composition of this type of catalysts we studied the distribution of alkali promoters in the structure of the catalyst. It is shown that the preferred location of cesium ions is the structure of β”-polyferrite of K2–zCszFe2+Fe3+
10O17 composition. There are tests of catalytic activity of this system with different content of cesium in the dehydrogenation of ethylbenzene to styrene (flow type reactor, 0,1 MPa, 600 °С, the volumetric flow rate of ethylbenzene 1 h–1, the weight ratio of ethylbenzene:steam 1:3). Shown that the maximum specific rate of styrene formation is achieved at interval ratio Cs :Fe 0,023–0,027, which corresponds to the coefficient z = 0,26÷0,30. Introduction more cesium is impractical. In this paper we first developed theoretical propositions for the targeted transporting of the promoting agent in a given phase of the catalytically active ferrite system. The content of expensive cesium compounds in the iron oxide catalyst is optimized.

Since 1997 the method for the synthesis of macroporous supports is developed active using nanoscale templates that are deleted from the final product by burning or dissolution. In this paper the 3-D structured macroporous supports of different chemical nature were obtained by templating technology - aluminum oxide, dioxide of titanium and zirconium, as well as hierarchical silikalit and Fe-silikalit structure of zeolite ZSM-5. Templates consist of densely packed monodisperse polystyrene spheres with diameters ranging from 250 to 1150 nm. It is shown that template synthesis leads to a significant increase in specific pore volume and the surface of the porous oxides. Thus, the pore volume of granular samples of aluminum oxide, obtained in the absence and presence of the polystyrene template are 0,34 and 1,22 cm3/g, respectively. The value of the outer surface area varies from 26,8 m2/g for notemplatу Fe-silicalite with the structure of ZSM-5 zeolite up to 410 m2/g in the same sample obtained in the presence of polystyrene template. Textural evidence suggests a very promising new materials for adsorption and catalytic processes involving high-molecular compounds, such as the catalytic hydrotreatment of heavy oil fractions, conversion of biomass and lignin into chemical products, including liquid hydrocarbons, upon receipt of pharmaceuticals, as well as the adsorption of large molecules, such as heavy metals from aqueous solutions.

The influence of nature and textural characteristics of the support on the activity, selectivity and stability of modified palladium catalysts for the vinyl acetate (VA) synthesis by ethylene gasphase acetoxylation is studied. For the catalysts preparation the
industrial and experimental supports based on aluminum oxide grades A1, ShN-2 and silica gel grades KSK, KSS 3 (initial and after heat treatment) are used. According to the catalytic tests results (during 48 and 200 hours) as the base support for the palladium catalysts for VA synthesis was selected silica gel KSS-3 (1), previously hydrothermal treatmented. By varying the temperature and, consequently, the water vapor pressure, as well as heat treatment continuance of the silica gel grade KSS-3, they reach an optimal parameters balance of the support that provide the stable operation of the catalyst: bulk density – 0,54 g/cm3; specific surface area – 150±10 m2/L, the pore volume 0,80-0,83 cm3/g, pore radius 1100–1200 nm. It is shown that the operation of the catalyst composition 1,5 % Pd, 0,75% Au and 5,0% potassium acetate on the support of KCC-3 (1) at 6 months in an industrial reactor of the VA synthesis the activity and selectivity higher at 20–25 % than the last industrial catalyst. Results of the study led to recommend the support for industrial use with a projected lifetime of the catalyst at least three years. Developed and experimentally confirmed the correctness of methods to predict the effectiveness of the catalyst for a longer period (up to ~1000 h) on the base of short-term (48 h) tests. The practical significance of the method consists in the fact that its use in selecting of a support for mixed supported catalysts of VA synthesis from ethylene will significantly reduce the number and duration of the experiments.

The heterogeneous catalysts are considered for hydroforming (hydro
deoxygenation) products of biomass fast pyrolysis (bio-oil) to produce hydrocarbons for combustion purposes. There is conventional division of hydro deoxygenation catalysts into 3 groups: catalysts based on noble metal, sulfided catalysts for desulfurization and not sulfided catalysts based on supported transition metals, the emphasis in this review is on the not sulfided nature catalytic system on the nickel base as the most promising systems for hydroforming of feed with low sulfur concentration. Taking into account the nature of bio-oil (high acidity and viscosity, low thermal stability), the requirements are defines that must be applied in the development of catalysts and processes hydro deoxygenation, particularly the stability requirements this type of catalysts and their ability to repeated regeneration.

The work is devoted to the synthesis of platinum catalytic systems
hypercrosslinked polystyrene based, studying of the obtained systems structure and their testing in a model reaction of enantioselective hydrogenation ethyl pyruvate whose product, R-ethyl lactate, can be used as a chiral monomer for biodegradable polymers productions. The obtained catalytic systems were characterized by XPS, TEM, XRD, diffuse reflectance infrared spectroscopy, low-temperature adsorption of nitrogen. The study found that the formation of Pt(0) nanoparticles begins at the stage of the precursor introducing into the polymer matrix, and the active phase forming particles have a narrow size distribution with a maximum near 2 nm. The maximum enantiomeric excess achieved in the test reaction is 75 %. There is possibility of premodification of the catalyst without loss of enantioselectivity in the hydrogenation process.

The ability of naturally occurring phenolic compounds affect on the catalytic activity of enzymes and enzyme preparations is of interest to various industries and medicine. One group of such compounds are the isoflavones, in particular, derived from soybeans. In this paper we demonstrate the influence of soy isoflavones on the degree of hydrolysis of yeast RNA by pancreatic ribonuclease, and sodium caseinate by trypsin. Improving the efficiency of the process in the first case can be used in the production of pancreatic hydrolyzate of RNA, decreased in the second - in those cases where you want to suppress proteolysis. In addition, it is shown that soy isoflavones are able to interact with both enzymes and with the appropriate substrates, as well as the influence on the temperature and pH optima of activity, ribonuclease and trypsin. Held calculation of the kinetic constants in the work can serve as a basis for a mathematical description of the process.