Abstract
The amount, nature and location of the different types of coke formed during the dehydroaromatization of methane was studied over molybdenum carbide supported on HMCM-22 zeolite in both the as-synthesized form and after surface aluminum removal (higher stability), at 973 K. TG results confirmed the presence of two types of coke: carbidic and non-carbidic coke. TPO profiles let it clear that the non-carbidic coke deposited on Mo species were higher for the samples for which the ratio Mo species/free Brønsted acid sites is high. The increase in Mo content also caused a significant decrease of the amount of non-carbidic aromatic coke deposited on Brønsted acid sites.
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