[Retracted] Research on Ethanol Coupling to Prepare C₄ Olefins Based on BP Neural Network and Cluster Analysis

Table 2

The results of the significance test of each parameter.

Parameter	Temperature	Charge ratio	Co loading	Ethanol concentration
Ethanol conversion rate	≤0.001	≤0.001	0.008	0.007
C4 olefin selectivity	≤0.001	≤0.001	0.002	≤0.001

Note: , , and represent significant, relatively significant, and very significant, respectively.