band-wise在句中是什么意思? 有时英文搞不懂，上网查查有没有相关英文说明，也有助于理解。 a disadvantage of the prior solid acid catalysts is that the catalyst can become rapidly deactivated due to the formation of poly alkylates (e.g. c 12+ product) which inhibits the alkylation reactions - - somewhat like very soft coke. as soon as the catalyst forms a certain level of polyalkylates, the catalyst essentially stops the alkylation reactions. in a fixed bed reactor, an often preferred configuration, one can view the deactivation as occurring as a band- wise aging, with the deactivation zone moving as a band throughout the bed until most of the bed is inactive. this catalyst deactivation requires that the catalyst be periodically regenerated to ensure that the process produces a sufficient yield of the desired product. [ ]查看更多
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