No abstract

Catalysts from heteropoly acid H 3 PW 12 O 40 and its Cs, Na, Ba, Pb, Ca, Cd, Cr, Mn, V, La salts supported on clinoptilolite, alumosilicate are highly active in oxidative conversion of propane-butane (OCPB) mixture and formation of C 2 -C 4 olefins, oxygen-containing compounds at temperatures T = 100-800°C. Optimum yields of ethylene and propylene are achieved on heteropoly acid its Cs and Cr salts. The processes of oxidative dehydrogenation (ODPB) and cracking are concurrent in formation of olefins. High activity is caused by dispersity of supported catalysts (XRD, IRS) both formation of crystal hydrates and an amorphous phase of heteropoly acid in a condition of interaction with the carrier.

The processing of alkanes (the main components of natural gas) for obtaining of industrially important chemical products is one of the most urgent environmental problems, because the major share of raw materials are burned in torches. Therefore, the main goal of the work is the development of catalysts and conditions for obtaining of important petrochemical products from light alkanes. For the preparation of catalysts, Mo, Cr and Ga oxide catalysts as well as catalysts based on heteropoly compounds, supported on natural materials were used. The catalysts were prepared by the capillary impregnation method and used in oxidative conversion in a flowing unit while varying the process conditions. It has been determined that 5 and 10% MoCrGa catalysts are optimal for obtaining of liquid and gaseous products, and 1% catalyst is more favorable for the synthesis of gaseous products. Supported catalysts from heteropoly acid Н3PW12O40 are highly active in oxidative dehydrogenation and cracking processes, which are concurrent. High activity is caused by dispersity of catalysts, formation of crystal hydrates and amorphous phase of heteropoly acid in a condition of interaction with carrier. Maximum yield of C2H4 - 35.2% at 973 K, C3H6 – 20.0% and C4H8 – 14.3% at 773 К were observed.

Data on the study of thermally stable manganese oxide catalysts for deep oxidation of lean CH 4 and propane-butane mixtures in air into CO 2 are presented in the paper. New approaches to the synthesis of polyoxide catalysts based on Mn, modified with rare earth elements (La, Ce) and alkaline earth elements (Ba, Sr) when its supporting from nitrate solutions onto the alumina granules stabilized with 2 % Ce were used in the preparation of catalysts. Polyoxide thermally stable (up to 1473 K) highperformance Mn-containing catalyst for deep oxidation of CH 4 and propane-butane in gas-air mixture was developed. Prototype of the catalytic heat generator for environmentally friendly burning of methane and propane-butane mixture was created. Experienced tests of the catalytic heat generator for heating of greenhouses were performed and carbon dioxide fertilizing of plants by combustion products of propane-butane mixture was carried out. REERare earth elements AEE Alkaline earth elements a CH4 Degree of CH 4 conversion XRD X-ray diffraction TEM Transmission electron microscopy BET Brunauer-Emmett-Teller method ESDR Electronic spectroscopy of diffuse reflections TPD Temperature-programmed desorption TPR Temperature-programmed reduction TPO Temperature-programmed oxidation S Surface area