The phrase "an additional catalyst" is correct and usable in written English.
It can be used when referring to something that serves to accelerate or facilitate a process, often in a metaphorical sense.
Example: "The new policy acted as an additional catalyst for innovation within the company."
Alternatives: "a further catalyst" or "an extra catalyst".
Social sharing acts as an additional catalyst of user attention.
Since carbon-based materials have poor catalytic activity, an additional catalyst is required to boost the reduction process.
The Fe sublayer, an additional catalyst added to the conventional catalyst/support design, plays a key role in the growth of well aligned and highly dense CNT forests.
The membrane tube was used in a catalytic membrane reactor for oxidative coupling of methane (OCM) to C2 without an additional catalyst.
It was reported that hierarchically assembled porous graphene sheets deliver a very high capacity of 15,000 mAh/g based on the mass of porous graphene without an additional catalyst in pure oxygen [20].
This method allows the bulk metal surface to act as both the catalyst and support for the CNT growth, thus enhancing the contact and adherence of the tubes to the substrate and eliminating the requirement of adding an additional catalyst in the process.
This strategy provided a convenient route without any additional catalyst or metal salt under mild conditions.
Diamond thin films (on silicon wafers) and carbon nanotubes (CNTs) (on Inconel plates) were simultaneously synthesized at temperatures ⩽550°CC without any additional catalyst.
In this context, this study deals with the process optimization of furfural production from oil palm empty fruit bunch using dilute sulfuric acid pretreatment followed by dehydration without any additional catalyst.
Furthermore, after conversion of carboxylic group to acyl chloride group, using rigid rod-like hydroquione and twisted phenolphthalein as bisphenol crosslinkers, respectively, the transparent smooth polymer films with three-dimensional network structures were readily obtained at the curing temperature below 200 °C without needing any additional catalyst.
Hence above a certain level, the additional catalyst amount does not get involved in catalytic activity and further increment in the reaction rate was not observed.
