Fitting functions of temperature T, ethanol conversion rate Y(T), and C₄ olefins selectivity P(T) in different catalyst combinations.

Catalyst combination	Temperature T and ethanol conversion rate Y(T)	Temperature (T) and C4 olefins selectivity (P)
A1
A2		P(T) = 30.58 − 4.786 cos(T × 0.02781) − 13.58 sin(T × 0.02781)
A3
A4
A5	Y(T) = 436 100 000 − 436 100 000 × cos(T × 3.831 × 10−6) − 436 500 × sin(T × 3.831 × 10−6)
A6	Y(T) = 0.02233 e0.01849T	P(T) = 0.02233 e0.01849T
A7	Y(T) = 29.36 − 74.96 × cos(T × 0.005311) + 8.471 × sin(T × 0.005311)	P(T) = 48.03 + 20.86 × cos(T × 0.008251) − 36.75 × sin(T × 0.008251)
A8
A9	Y(T) = 0.006922 e0.0217T
A10		P(T) = 0.01622 e0.01605T
A11
A12
A13
A14
B1		P(T) = 29.49 + 22.79 × cos(T × 0.01355) + 4.235 × sin(T × 0.01355)
B2	Y(T) = 0.01647 e0.01978T	P(T) = 0.01647 e0.01978T
B3		P(T) = 28.25 + 25.07 × cos(T × 0.0129) + 0.401 × sin(T × 0.0129)
B4
B5	Y(T) = 0.01256 e0.02046T	P(T) = 26.29 + 14.19 ×cos(T × 0.009524) − 17.19 × sin(T × 0.009524)
B6		P(T) = 17.29–11.31 × cos(T × 0.02212) + 6.735 × sin(T × 0.02212)
B7