Effect of K Addition and Acidification of Zeolite Support on the Performance of Zr:Mo/Hzsm-5 Modified Catalyst in Methane Aromatization
The conversion of methane into higher hydrocarbons and aromatics on potassium doped modified zeolite Zr:Mo catalysts under non oxidizing conditions have been studied in a fixed bed catalytic reactor system at 450 0 C and at atmospheric pressure. The potassium addition reduces the formation of carbon during the catalytic reaction. This also results in the stability of the catalyst system and increased aromatics production. This is due to electronically modified active sites and increase in Bronsted acidity.
Catalytic performance of zeolite ITQ-13 with 9- and 10-member rings for methane dehydroaromation
ITQ-13, a tridirectional medium-pore zeolite containing 9- and 10-member-ring pores, has been successfully synthesized by a hydrothermal method. The catalytic performance of Mo-ITQ-13 is worse than with Mo-ZSM-5 in the methane aromatization reaction. It has been shown that 9-member-ring channels favor coke and are a disadvantage in methane non-oxidative aromatization.
Male/female ratio in electroantennogram responses of the american cockroach to (+)-trans-verbenyl acetate and related compounds: Relationship between the ratio and sex pheromonal activity☆
Abstract 1. 1. The male/female (M/F) ratio in the EAG response of the American cockroach were evaluated for the sex pheromone mimic, (+)- trans -verbenyl acetate, and its analogs, using the male and female EAG amplitudes at 50 μg on the lines which indicate the dose effect on the EAG amplitudes. 2. 2. The ratio values were related to the potency of sex pheromonal activity of the compounds. 3. 3. The ratio value increased with increase of pheromonal activity. 4. 4. The pheromonally inactive analogs were regarded as general odors from their small M/F ratio values.