Methane dehydroaromatization reaction at 700 °C over Mo/ZSM-5 involves numerous modifications of the molybdenum species from catalyst preparation and throughout lifetime, composed 4 successive steps: calcination, activation, induction, deactivation. A thorough kinetic study was undertaken with aim to understand transformation phenomena occurring on during each stage reaction, using methane gas ...

Accelerated deactivation of Co/Al2O3 catalysts in Fischer-Tropsch synthesis and the effect of Re and Ru as the catalytic promoters are reported. 15wt% Co/Al2O3 catalyst and 1wt% Ru and 1.4wt% Re  promoted cobalt catalysts have been formulated and extensively characterized. The deactivation of the unpromoted cobalt catalyst and those promoted with ...

accelerated deactivation of co/al2o3 catalysts in fischer-tropsch synthesis and the effect of re and ru as the catalytic promoters are reported. 15wt% co/al2o3 catalyst and 1wt% ru and 1.4wt% re  promoted cobalt catalysts have been formulated and extensively characterized. the deactivation of the unpromoted cobalt catalyst and those promoted with re and ru were studied by accelerated method at ...

We examined the effects of the neurosteroid pregnenolone sulfate (PS) on GABA(A) receptor-mediated synaptic currents and currents elicited by rapid applications of GABA onto nucleated outside-out patches in cultured postnatal rat hippocampal neurons. At 10 microm, PS significantly depressed peak responses and accelerated the decay of evoked inhibitory synaptic currents. In nucleated outside-out...

Abstract The utilization of real producer gases such as raw biogas or gasified wood for chemical looping hydrogen production implies the introduction harmful contaminants into process. Hydrogen sulfide represents one most challenging trace in reformer steam iron cycle. aim present work was an in-depth investigation reforming with pure methane and synthetic contaminated selective concentrations ...

Deactivation of the human brain's default mode network (DMN) is regarded as suppression of endogenous activity to support exogenous task-related processes. This phenomenon has important functional relevance and insufficient DMN deactivation has been implicated in several neuropsychiatric disorders. However, the neurochemical mechanism of the DMN's deactivation remains largely unknown. In the pr...

A study was made of the coking of a commercial fresh sulfide Ni-Mo/Al2O3 catalyst in a fixed-bed reactor. The catalyst was coked using different coke precursors in the gas oil under accelerated conditions at temperatures of 400 to 450°C to yield different deactivated catalysts containing 2-20 wt% C. Two cases were studied; crushed catalyst without diffusional ...