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甲烷无氧芳构化催化剂 Mo/HZSM- 5上担载第二组分 Co后 ,提高了催化剂的稳定性 ,但加快了催化剂上的积炭速率 ,且积炭速率随 Co添加量的增加而提高 .因而认为催化剂的失活速率与积炭速率并不成顺比关系 .研究认为 ,一方面 ,Co的添加增加了催化剂的脱氢能力 ,使更多的中间产物乙烯进一步脱氢转化成芳烃或积炭 ;另一方面 ,增加了催化剂的抗积炭能力 .并认为部分积炭可能对提高催化剂的稳定性起到一定的作用 .空速实验表明 ,在高空速下 ,催化剂上的积炭更易使催化剂失活 . Co的添加使催化剂在较高温度下也具有较好的稳定性 .
After the second component of Co supported on Mo / HZSM-5 catalyst, the stability of the catalyst is improved, but the rate of carbon deposition on the catalyst is accelerated, and the rate of carbon deposition increases with the addition of Co So that the catalyst deactivation rate and the carbon deposition rate is not a direct relationship.Studies that, on the one hand, the addition of Co increases the dehydrogenation capacity of the catalyst, so that more intermediate ethylene further dehydrogenation into aromatic or Carbon deposition; on the other hand, it increases the anti-carbon deposition ability of the catalyst, and considers that partial carbon deposition may play a role in improving the stability of the catalyst. Airspeed experiments show that carbon deposition on the catalyst is easier at high space velocity The catalyst deactivation.Co addition to the catalyst at higher temperatures also has better stability.