Study of Syngas Conversion to Light Olefins by Response Surface Methodology

Table 2

Results of response surface methodology for different responses.

Response; surface; model	Statistical significant terms			Statistical criterions
	Simple	Quadratic	Interaction	Complete RSM model			Pruned RSM model
				𝑅^2	𝑅^2adj	𝐹 regression; (𝑃 value)	𝑅^2	𝑅^2adj	𝐹 regression; (𝑃 value)
CO; conversion	all	all	MgO × 𝑃 MgO × 𝑇	99.6	98.8	124.72; (0.000)	99.5	98.8	143.23; (0.000)
CH4; selectivity	P	𝑇 * 𝑇	MgO × 𝑃; MgO × 𝑇	91.2	75.3	5.73; (0.034)	74.6	60.6	5.30; (0.015)
C2H6; selectivity	T, P; MgO	MgO * MgO; T * T	—	98.3	95.3	32.7; (0.001)	93.7	90.2	26.50; (0.000)
C2H4; selectivity	P	T * T; P * P	—	99.2	97.9	73.35; (0.000)	98.4	97.7	152.99; (0.000)
C3H8; selectivity	MgO; P	—	MgO × 𝑃 MgO × 𝑇	97.1	91.8	18.36; (0.003)	95.8	93.5	41.38; (0.000)
C3H6; selectivity	MgO; T	—	MgO × 𝑃	90	72.1	5.02; (0.045)	76.3	66.9	8.06; (0.004)
C4H8; selectivity	MgO; P	𝑃 * 𝑃	—	94	83.1	8.64; (0.014)	78.3	72.4	13.24; (0.001)
O/P ratio	T, P; MgO	T * T; P * P	MgO × 𝑃	98.8	96.6	45.02; (0.000)	97.4	95.4	49.06; (0.000)
Chain growth; probability, α	MgO; T	𝑃 * 𝑃	MgO × 𝑃; MgO × 𝑇	97.4	92.7	20.61; (0.002)	93	87.7	17.83; (0.000)